diff --git a/.github/workflows/action.yml b/.github/workflows/action.yml
index c5f09cbf06..51133e4fd8 100644
--- a/.github/workflows/action.yml
+++ b/.github/workflows/action.yml
@@ -169,7 +169,7 @@ jobs:
         if: ${{ matrix.legs.RTT_TOOL_CHAIN == 'sourcery-arm' && success() }}
         shell: bash
         run: |
-          wget -q https://developer.arm.com/-/media/Files/downloads/gnu-rm/10-2020q4/gcc-arm-none-eabi-10-2020-q4-major-x86_64-linux.tar.bz2
+          wget -q https://github.com/RT-Thread/toolchains-ci/releases/download/v1.3/gcc-arm-none-eabi-10-2020-q4-major-x86_64-linux.tar.bz2
           sudo tar xjf gcc-arm-none-eabi-10-2020-q4-major-x86_64-linux.tar.bz2 -C /opt
           /opt/gcc-arm-none-eabi-10-2020-q4-major/bin/arm-none-eabi-gcc --version
           echo "RTT_EXEC_PATH=/opt/gcc-arm-none-eabi-10-2020-q4-major/bin" >> $GITHUB_ENV
@@ -186,7 +186,7 @@ jobs:
       - name: Install Riscv64-unknown-elf ToolChains
         if: ${{ matrix.legs.RTT_TOOL_CHAIN == 'sourcery-riscv64-unknown-elf' && success() }}
         run: |
-          wget -q https://static.dev.sifive.com/dev-tools/freedom-tools/v2020.12/riscv64-unknown-elf-toolchain-10.2.0-2020.12.8-x86_64-linux-ubuntu14.tar.gz
+          wget -q https://github.com/RT-Thread/toolchains-ci/releases/download/v1.4/riscv64-unknown-elf-toolchain-10.2.0-2020.12.8-x86_64-linux-ubuntu14.tar.gz
           sudo tar zxvf riscv64-unknown-elf-toolchain-10.2.0-2020.12.8-x86_64-linux-ubuntu14.tar.gz -C /opt
           /opt/riscv64-unknown-elf-toolchain-10.2.0-2020.12.8-x86_64-linux-ubuntu14/bin/riscv64-unknown-elf-gcc --version
           echo "RTT_EXEC_PATH=/opt/riscv64-unknown-elf-toolchain-10.2.0-2020.12.8-x86_64-linux-ubuntu14/bin" >> $GITHUB_ENV
@@ -194,7 +194,7 @@ jobs:
       - name: Install Riscv-none-embed ToolChains
         if: ${{ matrix.legs.RTT_TOOL_CHAIN == 'sourcery-riscv-none-embed' && success() }}
         run: |
-          wget -q https://github.com/xpack-dev-tools/riscv-none-embed-gcc-xpack/releases/download/v8.3.0-2.3/xpack-riscv-none-embed-gcc-8.3.0-2.3-linux-x64.tar.gz
+          wget -q https://github.com/RT-Thread/toolchains-ci/releases/download/v1.5/xpack-riscv-none-embed-gcc-8.3.0-2.3-linux-x64.tar.gz
           sudo tar zxvf xpack-riscv-none-embed-gcc-8.3.0-2.3-linux-x64.tar.gz -C /opt
           /opt/xpack-riscv-none-embed-gcc-8.3.0-2.3/bin/riscv-none-embed-gcc --version
           echo "RTT_EXEC_PATH=/opt/xpack-riscv-none-embed-gcc-8.3.0-2.3/bin" >> $GITHUB_ENV
diff --git a/.github/workflows/action_utest.yml b/.github/workflows/action_utest.yml
index 06d8ec15ff..b83fd21bdd 100644
--- a/.github/workflows/action_utest.yml
+++ b/.github/workflows/action_utest.yml
@@ -37,7 +37,7 @@ jobs:
       if: ${{ matrix.legs.QEMU_ARCH == 'arm' && success() }}
       shell: bash
       run: |
-        wget -q https://developer.arm.com/-/media/Files/downloads/gnu-rm/10-2020q4/gcc-arm-none-eabi-10-2020-q4-major-x86_64-linux.tar.bz2
+        wget -q https://github.com/RT-Thread/toolchains-ci/releases/download/v1.3/gcc-arm-none-eabi-10-2020-q4-major-x86_64-linux.tar.bz2
         sudo tar xjf gcc-arm-none-eabi-10-2020-q4-major-x86_64-linux.tar.bz2 -C /opt
         /opt/gcc-arm-none-eabi-10-2020-q4-major/bin/arm-none-eabi-gcc --version
         echo "RTT_EXEC_PATH=/opt/gcc-arm-none-eabi-10-2020-q4-major/bin" >> $GITHUB_ENV
@@ -45,7 +45,7 @@ jobs:
     - name: Install RISC-V ToolChains
       if: ${{ matrix.legs.QEMU_ARCH == 'riscv64' && success() }}
       run: |
-        wget -q https://static.dev.sifive.com/dev-tools/freedom-tools/v2020.12/riscv64-unknown-elf-toolchain-10.2.0-2020.12.8-x86_64-linux-ubuntu14.tar.gz
+        wget -q https://github.com/RT-Thread/toolchains-ci/releases/download/v1.4/riscv64-unknown-elf-toolchain-10.2.0-2020.12.8-x86_64-linux-ubuntu14.tar.gz
         sudo tar zxvf riscv64-unknown-elf-toolchain-10.2.0-2020.12.8-x86_64-linux-ubuntu14.tar.gz -C /opt
         /opt/riscv64-unknown-elf-toolchain-10.2.0-2020.12.8-x86_64-linux-ubuntu14/bin/riscv64-unknown-elf-gcc --version
         echo "RTT_EXEC_PATH=/opt/riscv64-unknown-elf-toolchain-10.2.0-2020.12.8-x86_64-linux-ubuntu14/bin" >> $GITHUB_ENV
diff --git a/bsp/n32g452xx/Libraries/rt_drivers/drv_flash.c b/bsp/n32g452xx/Libraries/rt_drivers/drv_flash.c
index 637562bf3b..cba0b38768 100644
--- a/bsp/n32g452xx/Libraries/rt_drivers/drv_flash.c
+++ b/bsp/n32g452xx/Libraries/rt_drivers/drv_flash.c
@@ -8,6 +8,7 @@
  * 2021-08-20     breo.com     first version
  */
 
+#include <stddef.h>
 #include <board.h>
 #include <rtthread.h>
 
diff --git a/bsp/n32g452xx/Libraries/rt_drivers/drv_pwm.c b/bsp/n32g452xx/Libraries/rt_drivers/drv_pwm.c
index fbdb40634e..1e1b51c342 100644
--- a/bsp/n32g452xx/Libraries/rt_drivers/drv_pwm.c
+++ b/bsp/n32g452xx/Libraries/rt_drivers/drv_pwm.c
@@ -5,51 +5,94 @@
  *
  * Change Logs:
  * Date           Author       Notes
- * 2020-1-13      Leo         first version
+ * 2021-11-11     breo.com     first version
  */
 
 #include <board.h>
 #include "drv_pwm.h"
 
 #ifdef RT_USING_PWM
-    #if !defined(BSP_USING_TIM3_CH1) && !defined(BSP_USING_TIM3_CH2) && \
-        !defined(BSP_USING_TIM3_CH3) && !defined(BSP_USING_TIM3_CH4)
+    #if !defined(BSP_USING_TIM1_CH1) && !defined(BSP_USING_TIM1_CH2) && \
+        !defined(BSP_USING_TIM1_CH3) && !defined(BSP_USING_TIM1_CH4) && \
+        !defined(BSP_USING_TIM2_CH1) && !defined(BSP_USING_TIM2_CH2) && \
+        !defined(BSP_USING_TIM2_CH3) && !defined(BSP_USING_TIM2_CH4) && \
+        !defined(BSP_USING_TIM3_CH1) && !defined(BSP_USING_TIM3_CH2) && \
+        !defined(BSP_USING_TIM3_CH3) && !defined(BSP_USING_TIM3_CH4) && \
+        !defined(BSP_USING_TIM4_CH1) && !defined(BSP_USING_TIM4_CH2) && \
+        !defined(BSP_USING_TIM4_CH3) && !defined(BSP_USING_TIM4_CH4) && \
+        !defined(BSP_USING_TIM5_CH1) && !defined(BSP_USING_TIM5_CH2) && \
+        !defined(BSP_USING_TIM5_CH3) && !defined(BSP_USING_TIM5_CH4) && \
+        !defined(BSP_USING_TIM8_CH1) && !defined(BSP_USING_TIM8_CH2) && \
+        !defined(BSP_USING_TIM8_CH3) && !defined(BSP_USING_TIM8_CH4)
         #error "Please define at least one BSP_USING_TIMx_CHx"
     #endif
 #endif /* RT_USING_PWM */
 
-#define DRV_DEBUG
-#define LOG_TAG             "drv.pwm"
-#include <drv_log.h>
-
 #define MAX_PERIOD 65535
-struct rt_device_pwm pwm_device;
+
+#ifdef BSP_USING_PWM
 
 struct n32_pwm
 {
-    struct rt_device_pwm pwm_device;
     TIM_Module *tim_handle;
-    rt_uint8_t channel;
-    char *name;
+    const char *name;
+    struct rt_device_pwm pwm_device;
+    int8_t tim_en;
+    uint8_t ch_en;
+    uint32_t period;
+    uint32_t psc;
 };
 
 static struct n32_pwm n32_pwm_obj[] =
 {
-#ifdef BSP_USING_TIM3_CH1
-    PWM1_TIM3_CONFIG,
+#if defined(BSP_USING_TIM1_CH1) || defined(BSP_USING_TIM1_CH2) || \
+        defined(BSP_USING_TIM1_CH3) || defined(BSP_USING_TIM1_CH4)
+    {
+        .tim_handle = TIM1,
+        .name = "tim1pwm",
+    },
 #endif
 
-#ifdef BSP_USING_TIM3_CH2
-    PWM2_TIM3_CONFIG,
+#if defined(BSP_USING_TIM2_CH1) || defined(BSP_USING_TIM2_CH2) || \
+        defined(BSP_USING_TIM2_CH3) || defined(BSP_USING_TIM2_CH4)
+    {
+        .tim_handle = TIM2,
+        .name = "tim2pwm",
+    },
 #endif
 
-#ifdef BSP_USING_TIM3_CH3
-    PWM3_TIM3_CONFIG,
+#if defined(BSP_USING_TIM3_CH1) || defined(BSP_USING_TIM3_CH2) || \
+        defined(BSP_USING_TIM3_CH3) || defined(BSP_USING_TIM3_CH4)
+    {
+        .tim_handle = TIM3,
+        .name = "tim3pwm",
+    },
 #endif
 
-#ifdef BSP_USING_TIM3_CH4
-    PWM4_TIM3_CONFIG,
+#if defined(BSP_USING_TIM4_CH1) || defined(BSP_USING_TIM4_CH2) || \
+        defined(BSP_USING_TIM4_CH3) || defined(BSP_USING_TIM4_CH4)
+    {
+        .tim_handle = TIM4,
+        .name = "tim4pwm",
+    },
 #endif
+
+#if defined(BSP_USING_TIM5_CH1) || defined(BSP_USING_TIM5_CH2) || \
+        defined(BSP_USING_TIM5_CH3) || defined(BSP_USING_TIM5_CH4)
+    {
+        .tim_handle = TIM5,
+        .name = "tim5pwm",
+    },
+#endif
+
+#if defined(BSP_USING_TIM8_CH1) || defined(BSP_USING_TIM8_CH2) || \
+        defined(BSP_USING_TIM8_CH3) || defined(BSP_USING_TIM8_CH4)
+    {
+        .tim_handle = TIM8,
+        .name = "tim8pwm",
+    }
+#endif
+
 };
 
 static rt_err_t drv_pwm_control(struct rt_device_pwm *device, int cmd, void *arg);
@@ -58,31 +101,22 @@ static struct rt_pwm_ops drv_ops =
     drv_pwm_control
 };
 
-static rt_err_t drv_pwm_enable(TIM_Module *TIMx, struct rt_pwm_configuration *configuration, rt_bool_t enable)
+static rt_err_t drv_pwm_enable(struct n32_pwm *pwm_dev, struct rt_pwm_configuration *configuration, rt_bool_t enable)
 {
     /* Get the value of channel */
     rt_uint32_t channel = configuration->channel;
+    TIM_Module *TIMx = pwm_dev->tim_handle;
 
-    if (!enable)
+    if (enable)
     {
-        if (channel == 1)
-        {
-            TIM_EnableCapCmpCh(TIMx, TIM_CH_1, TIM_CAP_CMP_DISABLE);
-        }
-        else if (channel == 2)
-        {
-            TIM_EnableCapCmpCh(TIMx, TIM_CH_2, TIM_CAP_CMP_DISABLE);
-        }
-        else if (channel == 3)
-        {
-            TIM_EnableCapCmpCh(TIMx, TIM_CH_3, TIM_CAP_CMP_DISABLE);
-        }
-        else if (channel == 4)
-        {
-            TIM_EnableCapCmpCh(TIMx, TIM_CH_4, TIM_CAP_CMP_DISABLE);
-        }
+        pwm_dev->ch_en |= 0x1 << channel;
     }
     else
+    {
+        pwm_dev->ch_en &= ~(0x1 << channel);
+    }
+
+    if (enable)
     {
         if (channel == 1)
         {
@@ -101,18 +135,47 @@ static rt_err_t drv_pwm_enable(TIM_Module *TIMx, struct rt_pwm_configuration *co
             TIM_EnableCapCmpCh(TIMx, TIM_CH_4, TIM_CAP_CMP_ENABLE);
         }
     }
+    else
+    {
+        if (channel == 1)
+        {
+            TIM_EnableCapCmpCh(TIMx, TIM_CH_1, TIM_CAP_CMP_DISABLE);
+        }
+        else if (channel == 2)
+        {
+            TIM_EnableCapCmpCh(TIMx, TIM_CH_2, TIM_CAP_CMP_DISABLE);
+        }
+        else if (channel == 3)
+        {
+            TIM_EnableCapCmpCh(TIMx, TIM_CH_3, TIM_CAP_CMP_DISABLE);
+        }
+        else if (channel == 4)
+        {
+            TIM_EnableCapCmpCh(TIMx, TIM_CH_4, TIM_CAP_CMP_DISABLE);
+        }
+    }
 
-    TIM_Enable(TIMx, ENABLE);
+    if (pwm_dev->ch_en)
+    {
+        pwm_dev->tim_en = 0x1;
+        TIM_Enable(TIMx, ENABLE);
+    }
+    else
+    {
+        pwm_dev->tim_en = 0x0;
+        TIM_Enable(TIMx, DISABLE);
+    }
 
     return RT_EOK;
 }
 
-static rt_err_t drv_pwm_get(TIM_Module *TIMx, struct rt_pwm_configuration *configuration)
+static rt_err_t drv_pwm_get(struct n32_pwm *pwm_dev, struct rt_pwm_configuration *configuration)
 {
     RCC_ClocksType  RCC_Clockstruct;
     rt_uint32_t ar, div, cc1, cc2, cc3, cc4;
-    rt_uint32_t channel = configuration->channel;
     rt_uint64_t tim_clock;
+    rt_uint32_t channel = configuration->channel;
+    TIM_Module *TIMx = pwm_dev->tim_handle;
 
     ar   = TIMx->AR;
     div  = TIMx->PSC;
@@ -140,9 +203,13 @@ static rt_err_t drv_pwm_get(TIM_Module *TIMx, struct rt_pwm_configuration *confi
     return RT_EOK;
 }
 
-static rt_err_t drv_pwm_set(TIM_Module *TIMx, struct rt_pwm_configuration *configuration)
+static rt_err_t drv_pwm_set(struct n32_pwm *pwm_dev, struct rt_pwm_configuration *configuration)
 {
+    TIM_Module *TIMx = pwm_dev->tim_handle;
+    rt_uint32_t channel = configuration->channel;
+
     /* Init timer pin and enable clock */
+    void n32_msp_tim_init(void *Instance);
     n32_msp_tim_init(TIMx);
 
     RCC_ClocksType RCC_Clock;
@@ -167,14 +234,17 @@ static rt_err_t drv_pwm_set(TIM_Module *TIMx, struct rt_pwm_configuration *confi
     period = period / psc;
     psc = psc * (input_clock / 1000000);
 
-    /* TIMe base configuration */
-    TIM_TimeBaseInitType TIM_TIMeBaseStructure;
-    TIM_InitTimBaseStruct(&TIM_TIMeBaseStructure);
-    TIM_TIMeBaseStructure.Period = period;
-    TIM_TIMeBaseStructure.Prescaler = psc - 1;
-    TIM_TIMeBaseStructure.ClkDiv = 0;
-    TIM_TIMeBaseStructure.CntMode = TIM_CNT_MODE_UP;
-    TIM_InitTimeBase(TIMx, &TIM_TIMeBaseStructure);
+    if ((pwm_dev->period != period) || (pwm_dev->psc != psc))
+    {
+        /* TIMe base configuration */
+        TIM_TimeBaseInitType TIM_TIMeBaseStructure;
+        TIM_InitTimBaseStruct(&TIM_TIMeBaseStructure);
+        TIM_TIMeBaseStructure.Period = period;
+        TIM_TIMeBaseStructure.Prescaler = psc - 1;
+        TIM_TIMeBaseStructure.ClkDiv = 0;
+        TIM_TIMeBaseStructure.CntMode = TIM_CNT_MODE_UP;
+        TIM_InitTimeBase(TIMx, &TIM_TIMeBaseStructure);
+    }
 
     rt_uint32_t pulse = (unsigned long long)configuration->pulse;
     /* PWM1 Mode configuration: Channel1 */
@@ -185,26 +255,33 @@ static rt_err_t drv_pwm_set(TIM_Module *TIMx, struct rt_pwm_configuration *confi
     TIM_OCInitStructure.Pulse = pulse;
     TIM_OCInitStructure.OcPolarity = TIM_OC_POLARITY_HIGH;
 
-    rt_uint32_t channel = configuration->channel;
     if (channel == 1)
     {
         TIM_InitOc1(TIMx, &TIM_OCInitStructure);
         TIM_ConfigOc1Preload(TIMx, TIM_OC_PRE_LOAD_ENABLE);
+        if (!(pwm_dev->ch_en & (0x1 << channel)))
+            TIM_EnableCapCmpCh(TIMx, TIM_CH_1, TIM_CAP_CMP_DISABLE);
     }
     else if (channel == 2)
     {
         TIM_InitOc2(TIMx, &TIM_OCInitStructure);
         TIM_ConfigOc2Preload(TIMx, TIM_OC_PRE_LOAD_ENABLE);
+        if (!(pwm_dev->ch_en & (0x1 << channel)))
+            TIM_EnableCapCmpCh(TIMx, TIM_CH_2, TIM_CAP_CMP_DISABLE);
     }
     else if (channel == 3)
     {
         TIM_InitOc3(TIMx, &TIM_OCInitStructure);
         TIM_ConfigOc3Preload(TIMx, TIM_OC_PRE_LOAD_ENABLE);
+        if (!(pwm_dev->ch_en & (0x1 << channel)))
+            TIM_EnableCapCmpCh(TIMx, TIM_CH_3, TIM_CAP_CMP_DISABLE);
     }
     else if (channel == 4)
     {
         TIM_InitOc4(TIMx, &TIM_OCInitStructure);
         TIM_ConfigOc4Preload(TIMx, TIM_OC_PRE_LOAD_ENABLE);
+        if (!(pwm_dev->ch_en & (0x1 << channel)))
+            TIM_EnableCapCmpCh(TIMx, TIM_CH_4, TIM_CAP_CMP_DISABLE);
     }
 
     TIM_ConfigArPreload(TIMx, ENABLE);
@@ -216,18 +293,18 @@ static rt_err_t drv_pwm_set(TIM_Module *TIMx, struct rt_pwm_configuration *confi
 static rt_err_t drv_pwm_control(struct rt_device_pwm *device, int cmd, void *arg)
 {
     struct rt_pwm_configuration *configuration = (struct rt_pwm_configuration *)arg;
-    TIM_Module *TIMx = (TIM_Module *)device->parent.user_data;
+    struct n32_pwm *pwm_dev = (struct n32_pwm *)(device->parent.user_data);
 
     switch (cmd)
     {
     case PWM_CMD_ENABLE:
-        return drv_pwm_enable(TIMx, configuration, RT_TRUE);
+        return drv_pwm_enable(pwm_dev, configuration, RT_TRUE);
     case PWM_CMD_DISABLE:
-        return drv_pwm_enable(TIMx, configuration, RT_FALSE);
+        return drv_pwm_enable(pwm_dev, configuration, RT_FALSE);
     case PWM_CMD_SET:
-        return drv_pwm_set(TIMx, configuration);
+        return drv_pwm_set(pwm_dev, configuration);
     case PWM_CMD_GET:
-        return drv_pwm_get(TIMx, configuration);
+        return drv_pwm_get(pwm_dev, configuration);
     default:
         return RT_EINVAL;
     }
@@ -240,13 +317,12 @@ static int rt_hw_pwm_init(void)
 
     for (i = 0; i < sizeof(n32_pwm_obj) / sizeof(n32_pwm_obj[0]); i++)
     {
-        if (rt_device_pwm_register(&n32_pwm_obj[i].pwm_device, n32_pwm_obj[i].name, &drv_ops, n32_pwm_obj[i].tim_handle) == RT_EOK)
+        if (rt_device_pwm_register(&n32_pwm_obj[i].pwm_device,
+                                   n32_pwm_obj[i].name, &drv_ops, &(n32_pwm_obj[i])) == RT_EOK)
         {
-            LOG_D("%s register success", n32_pwm_obj[i].name);
         }
         else
         {
-            LOG_D("%s register failed", n32_pwm_obj[i].name);
             result = -RT_ERROR;
         }
     }
@@ -254,3 +330,6 @@ static int rt_hw_pwm_init(void)
     return result;
 }
 INIT_BOARD_EXPORT(rt_hw_pwm_init);
+
+#endif
+
diff --git a/bsp/n32g452xx/Libraries/rt_drivers/drv_pwm.h b/bsp/n32g452xx/Libraries/rt_drivers/drv_pwm.h
index 489b37166f..dc05465d89 100644
--- a/bsp/n32g452xx/Libraries/rt_drivers/drv_pwm.h
+++ b/bsp/n32g452xx/Libraries/rt_drivers/drv_pwm.h
@@ -18,50 +18,6 @@
 extern "C" {
 #endif
 
-#ifdef BSP_USING_TIM3_CH1
-#ifndef PWM1_TIM3_CONFIG
-#define PWM1_TIM3_CONFIG         \
-    {                              \
-        .tim_handle   = TIM3,        \
-        .name         = "tim3pwm1",  \
-        .channel      = 1            \
-    }
-#endif /* PWM1_TIM3_CONFIG */
-#endif /* BSP_USING_TIM3_CH1 */
-
-#ifdef BSP_USING_TIM3_CH2
-#ifndef PWM2_TIM3_CONFIG
-#define PWM2_TIM3_CONFIG         \
-    {                              \
-        .tim_handle   = TIM3,        \
-        .name         = "tim3pwm2",  \
-        .channel      = 2            \
-    }
-#endif /* PWM2_TIM3_CONFIG */
-#endif /* BSP_USING_TIM3_CH2 */
-
-#ifdef BSP_USING_TIM3_CH3
-#ifndef PWM3_TIM3_CONFIG
-#define PWM3_TIM3_CONFIG         \
-    {                              \
-        .tim_handle   = TIM3,        \
-        .name         = "tim3pwm3",  \
-        .channel      = 3            \
-    }
-#endif /* PWM3_TIM3_CONFIG */
-#endif /* BSP_USING_TIM3_CH3 */
-
-#ifdef BSP_USING_TIM3_CH4
-#ifndef PWM4_TIM3_CONFIG
-#define PWM4_TIM3_CONFIG             \
-    {                              \
-        .tim_handle   = TIM3,        \
-        .name         = "tim3pwm4",  \
-        .channel      = 4            \
-    }
-#endif /* PWM4_TIM3_CONFIG */
-#endif /* BSP_USING_TIM3_CH4 */
-
 #ifdef __cplusplus
 }
 #endif
diff --git a/bsp/n32g452xx/Libraries/rt_drivers/drv_wdt.c b/bsp/n32g452xx/Libraries/rt_drivers/drv_wdt.c
new file mode 100644
index 0000000000..31f921db0a
--- /dev/null
+++ b/bsp/n32g452xx/Libraries/rt_drivers/drv_wdt.c
@@ -0,0 +1,128 @@
+/*
+ * Copyright (c) 2006-2021, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author            Notes
+ * 2020-01-22     shelton           first version
+ * 2021-11-10     breo.com          porting to n32
+ */
+
+#include <board.h>
+#include <drivers/watchdog.h>
+
+#ifdef RT_USING_WDT
+#ifdef BSP_USING_WDT
+
+#define LSI_VALUE 40000
+
+//#define DRV_DEBUG
+#define LOG_TAG             "drv.wdt"
+#include <drv_log.h>
+
+struct n32_wdt_obj
+{
+    IWDG_Module *instance;
+    rt_uint32_t Prescaler;
+    rt_uint32_t Reload;
+    rt_uint16_t is_start;
+};
+static struct n32_wdt_obj n32_wdt;
+static struct rt_watchdog_ops ops;
+static rt_watchdog_t watchdog;
+
+static rt_err_t wdt_init(rt_watchdog_t *wdt)
+{
+    return RT_EOK;
+}
+
+static rt_err_t wdt_control(rt_watchdog_t *wdt, int cmd, void *arg)
+{
+    switch (cmd)
+    {
+    /* feed the watchdog */
+    case RT_DEVICE_CTRL_WDT_KEEPALIVE:
+        IWDG_ReloadKey();
+        break;
+    /* set watchdog timeout */
+    case RT_DEVICE_CTRL_WDT_SET_TIMEOUT:
+#if defined(LSI_VALUE)
+        if (LSI_VALUE)
+        {
+            n32_wdt.Reload = (*((rt_uint32_t *)arg)) * LSI_VALUE / 256 ;
+        }
+        else
+        {
+            LOG_E("Please define the value of LSI_VALUE!");
+        }
+        if (n32_wdt.Reload > 0xFFF)
+        {
+            LOG_E("wdg set timeout parameter too large, please less than %ds", 0xFFF * 256 / LSI_VALUE);
+            return -RT_EINVAL;
+        }
+#else
+#error "Please define the value of LSI_VALUE!"
+#endif
+        if (n32_wdt.is_start)
+        {
+            IWDG_WriteConfig(IWDG_WRITE_ENABLE);
+            IWDG_SetPrescalerDiv(n32_wdt.Prescaler);
+            IWDG_CntReload(n32_wdt.Reload);
+            IWDG_WriteConfig(IWDG_WRITE_DISABLE);
+            IWDG_Enable();
+        }
+        break;
+    case RT_DEVICE_CTRL_WDT_GET_TIMEOUT:
+#if defined(LSI_VALUE)
+        if (LSI_VALUE)
+        {
+            (*((rt_uint32_t *)arg)) = n32_wdt.Reload * 256 / LSI_VALUE;
+        }
+        else
+        {
+            LOG_E("Please define the value of LSI_VALUE!");
+        }
+#else
+#error "Please define the value of LSI_VALUE!"
+#endif
+        break;
+    case RT_DEVICE_CTRL_WDT_START:
+        IWDG_WriteConfig(IWDG_WRITE_ENABLE);
+        IWDG_SetPrescalerDiv(n32_wdt.Prescaler);
+        IWDG_CntReload(n32_wdt.Reload);
+        IWDG_WriteConfig(IWDG_WRITE_DISABLE);
+        IWDG_Enable();
+        n32_wdt.is_start = 1;
+        break;
+    default:
+        LOG_W("This command is not supported.");
+        return -RT_ERROR;
+    }
+    return RT_EOK;
+}
+
+int rt_hw_wdt_init(void)
+{
+    n32_wdt.instance = IWDG;
+    n32_wdt.Prescaler = IWDG_PRESCALER_DIV256;
+    n32_wdt.Reload = 0x00000FFF;
+    n32_wdt.is_start = 0;
+
+    ops.init = &wdt_init;
+    ops.control = &wdt_control;
+    watchdog.ops = &ops;
+    /* register watchdog device */
+    if (rt_hw_watchdog_register(&watchdog, "wdt", RT_DEVICE_FLAG_DEACTIVATE, RT_NULL) != RT_EOK)
+    {
+        LOG_E("wdt device register failed.");
+        return -RT_ERROR;
+    }
+    LOG_D("wdt device register success.");
+    return RT_EOK;
+}
+INIT_BOARD_EXPORT(rt_hw_wdt_init);
+
+#endif /* BSP_USING_WDT */
+#endif /* RT_USING_WDT */
+
diff --git a/bsp/n32g452xx/n32g452xx-mini-system/.config b/bsp/n32g452xx/n32g452xx-mini-system/.config
index 3ef47e09fc..0ce771a4bc 100644
--- a/bsp/n32g452xx/n32g452xx-mini-system/.config
+++ b/bsp/n32g452xx/n32g452xx-mini-system/.config
@@ -7,6 +7,7 @@
 # RT-Thread Kernel
 #
 CONFIG_RT_NAME_MAX=8
+# CONFIG_RT_USING_BIG_ENDIAN is not set
 # CONFIG_RT_USING_ARCH_DATA_TYPE is not set
 # CONFIG_RT_USING_SMP is not set
 CONFIG_RT_ALIGN_SIZE=4
@@ -142,7 +143,7 @@ CONFIG_RT_USING_PWM=y
 # CONFIG_RT_USING_RTC is not set
 # CONFIG_RT_USING_SDIO is not set
 # CONFIG_RT_USING_SPI is not set
-# CONFIG_RT_USING_WDT is not set
+CONFIG_RT_USING_WDT=y
 # CONFIG_RT_USING_AUDIO is not set
 # CONFIG_RT_USING_SENSOR is not set
 # CONFIG_RT_USING_TOUCH is not set
@@ -154,6 +155,7 @@ CONFIG_RT_USING_PWM=y
 #
 # Using USB
 #
+# CONFIG_RT_USING_USB is not set
 # CONFIG_RT_USING_USB_HOST is not set
 # CONFIG_RT_USING_USB_DEVICE is not set
 
@@ -161,10 +163,11 @@ CONFIG_RT_USING_PWM=y
 # POSIX layer and C standard library
 #
 CONFIG_RT_USING_LIBC=y
-# CONFIG_RT_USING_PTHREADS is not set
 CONFIG_RT_LIBC_USING_TIME=y
+# CONFIG_RT_LIBC_USING_FILEIO is not set
 # CONFIG_RT_USING_MODULE is not set
 CONFIG_RT_LIBC_DEFAULT_TIMEZONE=8
+# CONFIG_RT_USING_PTHREADS is not set
 
 #
 # Network
@@ -201,6 +204,7 @@ CONFIG_RT_LIBC_DEFAULT_TIMEZONE=8
 # CONFIG_RT_USING_RYM is not set
 # CONFIG_RT_USING_ULOG is not set
 # CONFIG_RT_USING_UTEST is not set
+# CONFIG_RT_USING_VAR_EXPORT is not set
 # CONFIG_RT_USING_RT_LINK is not set
 
 #
@@ -297,10 +301,6 @@ CONFIG_RT_LIBC_DEFAULT_TIMEZONE=8
 # CONFIG_PKG_USING_AGILE_FTP is not set
 # CONFIG_PKG_USING_EMBEDDEDPROTO is not set
 # CONFIG_PKG_USING_RT_LINK_HW is not set
-# CONFIG_PKG_USING_LORA_PKT_FWD is not set
-# CONFIG_PKG_USING_LORA_GW_DRIVER_LIB is not set
-# CONFIG_PKG_USING_LORA_PKT_SNIFFER is not set
-# CONFIG_PKG_USING_HM is not set
 
 #
 # security packages
@@ -334,13 +334,6 @@ CONFIG_RT_LIBC_DEFAULT_TIMEZONE=8
 # CONFIG_PKG_USING_NUEMWIN is not set
 # CONFIG_PKG_USING_MP3PLAYER is not set
 # CONFIG_PKG_USING_TINYJPEG is not set
-# CONFIG_PKG_USING_UGUI is not set
-
-#
-# U8G2: a monochrome graphic library
-#
-# CONFIG_PKG_USING_U8G2_OFFICIAL is not set
-# CONFIG_PKG_USING_U8G2 is not set
 
 #
 # tools packages
@@ -449,6 +442,7 @@ CONFIG_RT_LIBC_DEFAULT_TIMEZONE=8
 # CONFIG_PKG_USING_AS7341 is not set
 # CONFIG_PKG_USING_STM32_SDIO is not set
 # CONFIG_PKG_USING_ICM20608 is not set
+# CONFIG_PKG_USING_U8G2 is not set
 # CONFIG_PKG_USING_BUTTON is not set
 # CONFIG_PKG_USING_PCF8574 is not set
 # CONFIG_PKG_USING_SX12XX is not set
@@ -510,8 +504,6 @@ CONFIG_RT_LIBC_DEFAULT_TIMEZONE=8
 # CONFIG_PKG_USING_MCP23008 is not set
 # CONFIG_PKG_USING_BLUETRUM_SDK is not set
 # CONFIG_PKG_USING_MISAKA_AT24CXX is not set
-# CONFIG_PKG_USING_MISAKA_RGB_BLING is not set
-# CONFIG_PKG_USING_BL_MCU_SDK is not set
 
 #
 # AI packages
@@ -594,16 +586,12 @@ CONFIG_SOC_N32G452XX=y
 #
 CONFIG_RT_USING_GPIO=y
 # CONFIG_BSP_USING_ON_CHIP_FLASH is not set
+# CONFIG_BSP_USING_WDT is not set
 CONFIG_BSP_USING_UART=y
 CONFIG_BSP_USING_UART1=y
 # CONFIG_BSP_USING_UART2 is not set
 # CONFIG_BSP_USING_UART3 is not set
-CONFIG_BSP_USING_PWM=y
-CONFIG_BSP_USING_TIM3=y
-CONFIG_BSP_USING_TIM3_CH1=y
-CONFIG_BSP_USING_TIM3_CH2=y
-CONFIG_BSP_USING_TIM3_CH3=y
-CONFIG_BSP_USING_TIM3_CH4=y
+# CONFIG_BSP_USING_PWM is not set
 # CONFIG_BSP_USING_HWTIMER is not set
 # CONFIG_BSP_USING_SPI is not set
 # CONFIG_BSP_USING_I2C1 is not set
diff --git a/bsp/n32g452xx/n32g452xx-mini-system/board/Kconfig b/bsp/n32g452xx/n32g452xx-mini-system/board/Kconfig
index 1d02d7e97e..fd68886a07 100755
--- a/bsp/n32g452xx/n32g452xx-mini-system/board/Kconfig
+++ b/bsp/n32g452xx/n32g452xx-mini-system/board/Kconfig
@@ -26,7 +26,12 @@ menu "On-chip Peripheral Drivers"
 
     config BSP_USING_ON_CHIP_FLASH
         bool "Enable on-chip FLASH"
-        default n 
+        default n
+
+    config BSP_USING_WDT
+        bool "Enable Watchdog Timer"
+        select RT_USING_WDT
+        default n
 
     menuconfig BSP_USING_UART
         bool "Enable UART"
@@ -51,10 +56,44 @@ menu "On-chip Peripheral Drivers"
         default n
         select RT_USING_PWM
         if BSP_USING_PWM
-        menuconfig BSP_USING_TIM3
+        menuconfig BSP_USING_TIM1PWM
+            bool "Enable timer1 output PWM"
+            default n
+            if BSP_USING_TIM1PWM
+                config BSP_USING_TIM1_CH1
+                    bool "Enable TIM1 channel1 PWM"
+                    default n
+                config BSP_USING_TIM1_CH2
+                    bool "Enable TIM1 channel2 PWM"
+                    default n
+                config BSP_USING_TIM1_CH3
+                    bool "Enable TIM1 channel3 PWM"
+                    default n
+                config BSP_USING_TIM1_CH4
+                    bool "Enable TIM1 channel4 PWM"
+                    default n
+            endif
+        menuconfig BSP_USING_TIM2PWM
+            bool "Enable timer2 output PWM"
+            default n
+            if BSP_USING_TIM2PWM
+                config BSP_USING_TIM2_CH1
+                    bool "Enable TIM2 channel1 PWM"
+                    default n
+                config BSP_USING_TIM2_CH2
+                    bool "Enable TIM2 channel2 PWM"
+                    default n
+                config BSP_USING_TIM2_CH3
+                    bool "Enable TIM2 channel3 PWM"
+                    default n
+                config BSP_USING_TIM2_CH4
+                    bool "Enable TIM2 channel4 PWM"
+                    default n
+            endif
+        menuconfig BSP_USING_TIM3PWM
             bool "Enable timer3 output PWM"
             default n
-            if BSP_USING_TIM3
+            if BSP_USING_TIM3PWM
                 config BSP_USING_TIM3_CH1
                     bool "Enable TIM3 channel1 PWM"
                     default n
@@ -68,6 +107,57 @@ menu "On-chip Peripheral Drivers"
                     bool "Enable TIM3 channel4 PWM"
                     default n
             endif
+        menuconfig BSP_USING_TIM4PWM
+            bool "Enable timer4 output PWM"
+            default n
+            if BSP_USING_TIM4PWM
+                config BSP_USING_TIM4_CH1
+                    bool "Enable TIM4 channel1 PWM"
+                    default n
+                config BSP_USING_TIM4_CH2
+                    bool "Enable TIM4 channel2 PWM"
+                    default n
+                config BSP_USING_TIM4_CH3
+                    bool "Enable TIM4 channel3 PWM"
+                    default n
+                config BSP_USING_TIM4_CH4
+                    bool "Enable TIM4 channel4 PWM"
+                    default n
+            endif
+        menuconfig BSP_USING_TIM5PWM
+            bool "Enable timer5 output PWM"
+            default n
+            if BSP_USING_TIM5PWM
+                config BSP_USING_TIM5_CH1
+                    bool "Enable TIM5 channel1 PWM"
+                    default n
+                config BSP_USING_TIM5_CH2
+                    bool "Enable TIM5 channel2 PWM"
+                    default n
+                config BSP_USING_TIM5_CH3
+                    bool "Enable TIM5 channel3 PWM"
+                    default n
+                config BSP_USING_TIM5_CH4
+                    bool "Enable TIM5 channel4 PWM"
+                    default n
+            endif
+        menuconfig BSP_USING_TIM8PWM
+            bool "Enable timer8 output PWM"
+            default n
+            if BSP_USING_TIM8PWM
+                config BSP_USING_TIM8_CH1
+                    bool "Enable TIM8 channel1 PWM"
+                    default n
+                config BSP_USING_TIM8_CH2
+                    bool "Enable TIM8 channel2 PWM"
+                    default n
+                config BSP_USING_TIM8_CH3
+                    bool "Enable TIM8 channel3 PWM"
+                    default n
+                config BSP_USING_TIM8_CH4
+                    bool "Enable TIM8 channel4 PWM"
+                    default n
+            endif
         endif
 
     menuconfig BSP_USING_HWTIMER
diff --git a/bsp/n32g452xx/n32g452xx-mini-system/board/msp/n32_msp.c b/bsp/n32g452xx/n32g452xx-mini-system/board/msp/n32_msp.c
index 178c7d536d..f10dc4df3e 100644
--- a/bsp/n32g452xx/n32g452xx-mini-system/board/msp/n32_msp.c
+++ b/bsp/n32g452xx/n32g452xx-mini-system/board/msp/n32_msp.c
@@ -164,48 +164,64 @@ void n32_msp_tim_init(void *Instance)
 
     if (TIMx == TIM1)
     {
-        /* TIM1 clock enable */
         RCC_EnableAPB2PeriphClk(RCC_APB2_PERIPH_TIM1, ENABLE);
-        /* GPIOA clock enable */
         RCC_EnableAPB2PeriphClk(RCC_APB2_PERIPH_GPIOA, ENABLE);
-
-        /* GPIOA Configuration:TIM1 Channel1 and Channel4 as alternate function push-pull */
         GPIO_InitCtlStructure.Pin = GPIO_PIN_8 | GPIO_PIN_11;
         GPIO_InitCtlStructure.GPIO_Mode = GPIO_Mode_AF_PP;
         GPIO_InitCtlStructure.GPIO_Speed = GPIO_Speed_50MHz;
-
         GPIO_InitPeripheral(GPIOA, &GPIO_InitCtlStructure);
     }
 
     if (TIMx == TIM2)
     {
-        /* TIM2 clock enable */
         RCC_EnableAPB1PeriphClk(RCC_APB1_PERIPH_TIM2, ENABLE);
-        /* GPIOA clock enable */
         RCC_EnableAPB2PeriphClk(RCC_APB2_PERIPH_GPIOA, ENABLE);
-
-        /* GPIOA Configuration:TIM2 Channel1 and Channel2 as alternate function push-pull */
-        GPIO_InitCtlStructure.Pin = GPIO_PIN_0 | GPIO_PIN_1;
+        GPIO_InitCtlStructure.Pin = GPIO_PIN_0 | GPIO_PIN_1 | GPIO_PIN_2 | GPIO_PIN_3;
         GPIO_InitCtlStructure.GPIO_Mode = GPIO_Mode_AF_PP;
         GPIO_InitCtlStructure.GPIO_Speed = GPIO_Speed_50MHz;
-
         GPIO_InitPeripheral(GPIOA, &GPIO_InitCtlStructure);
     }
 
     if (TIMx == TIM3)
     {
-        /* TIM3 clock enable */
         RCC_EnableAPB1PeriphClk(RCC_APB1_PERIPH_TIM3, ENABLE);
-        /* GPIOA clock enable */
         RCC_EnableAPB2PeriphClk(RCC_APB2_PERIPH_GPIOA | RCC_APB2_PERIPH_GPIOB, ENABLE);
-
+        GPIO_InitCtlStructure.GPIO_Mode = GPIO_Mode_AF_PP;
+        GPIO_InitCtlStructure.GPIO_Speed = GPIO_Speed_50MHz;
         GPIO_InitCtlStructure.Pin = GPIO_PIN_6 | GPIO_PIN_7;
+        GPIO_InitPeripheral(GPIOA, &GPIO_InitCtlStructure);
+        GPIO_InitCtlStructure.Pin = GPIO_PIN_0 | GPIO_PIN_1;
+        GPIO_InitPeripheral(GPIOB, &GPIO_InitCtlStructure);
+    }
+
+    if (TIMx == TIM4)
+    {
+        RCC_EnableAPB1PeriphClk(RCC_APB1_PERIPH_TIM4, ENABLE);
+        RCC_EnableAPB2PeriphClk(RCC_APB2_PERIPH_GPIOB, ENABLE);
+        GPIO_InitCtlStructure.GPIO_Mode = GPIO_Mode_AF_PP;
+        GPIO_InitCtlStructure.GPIO_Speed = GPIO_Speed_50MHz;
+        GPIO_InitCtlStructure.Pin = GPIO_PIN_6 | GPIO_PIN_7 | GPIO_PIN_8 | GPIO_PIN_9;
+        GPIO_InitPeripheral(GPIOB, &GPIO_InitCtlStructure);
+    }
+
+    if (TIMx == TIM5)
+    {
+        RCC_EnableAPB1PeriphClk(RCC_APB1_PERIPH_TIM5, ENABLE);
+        RCC_EnableAPB2PeriphClk(RCC_APB2_PERIPH_GPIOB, ENABLE);
+        GPIO_InitCtlStructure.Pin = GPIO_PIN_0 | GPIO_PIN_1 | GPIO_PIN_2 | GPIO_PIN_3;
         GPIO_InitCtlStructure.GPIO_Mode = GPIO_Mode_AF_PP;
         GPIO_InitCtlStructure.GPIO_Speed = GPIO_Speed_50MHz;
         GPIO_InitPeripheral(GPIOA, &GPIO_InitCtlStructure);
+    }
 
-        GPIO_InitCtlStructure.Pin = GPIO_PIN_0 | GPIO_PIN_1;
-        GPIO_InitPeripheral(GPIOB, &GPIO_InitCtlStructure);
+    if (TIMx == TIM8)
+    {
+        RCC_EnableAPB2PeriphClk(RCC_APB2_PERIPH_TIM8, ENABLE);
+        RCC_EnableAPB2PeriphClk(RCC_APB2_PERIPH_GPIOC, ENABLE);
+        GPIO_InitCtlStructure.Pin = GPIO_PIN_6 | GPIO_PIN_7 | GPIO_PIN_8 | GPIO_PIN_9;
+        GPIO_InitCtlStructure.GPIO_Mode = GPIO_Mode_AF_PP;
+        GPIO_InitCtlStructure.GPIO_Speed = GPIO_Speed_50MHz;
+        GPIO_InitPeripheral(GPIOC, &GPIO_InitCtlStructure);
     }
 }
 #endif /* BSP_USING_PWM */
@@ -474,46 +490,6 @@ static int hwtimer_sample(int argc, char *argv[])
 MSH_CMD_EXPORT(hwtimer_sample, hwtimer sample);
 #endif
 
-#ifdef RT_USING_PWM
-static int pwm_set_test(const char *name, int ch,
-                        rt_uint32_t period, rt_uint32_t pulse)
-{
-    struct rt_device_pwm *pwm_dev = (struct rt_device_pwm *)rt_device_find(name);
-    if (pwm_dev == RT_NULL)
-    {
-        rt_kprintf("pwm sample run failed! can't find %s device!\n", name);
-        return RT_ERROR;
-    }
-    rt_pwm_set(pwm_dev, ch, period, pulse);
-    rt_pwm_enable(pwm_dev, ch);
-    return RT_EOK;
-}
-#define PWM_TEST_NAME_CH_1 "tim3pwm1"
-#define PWM_TEST_NAME_CH_2 "tim3pwm2"
-#define PWM_TEST_NAME_CH_3 "tim3pwm3"
-#define PWM_TEST_NAME_CH_4 "tim3pwm4"
-static int pwm_led_sample(int argc, char *argv[])
-{
-    pwm_set_test(PWM_TEST_NAME_CH_1, 1, 1000, 200);
-    pwm_set_test(PWM_TEST_NAME_CH_2, 2, 1000, 400);
-    pwm_set_test(PWM_TEST_NAME_CH_3, 3, 1000, 600);
-    pwm_set_test(PWM_TEST_NAME_CH_4, 4, 1000, 700);
-    return RT_EOK;
-}
-MSH_CMD_EXPORT(pwm_led_sample, pwm sample);
-static int pwm_led_sample_off(int argc, char *argv[])
-{
-    struct rt_device_pwm *pwm_dev = (struct rt_device_pwm *)rt_device_find(PWM_TEST_NAME_CH_1);
-    if (pwm_dev == RT_NULL)
-    {
-        rt_kprintf("pwm sample run failed! can't find %s device!\n", PWM_TEST_NAME_CH_1);
-        return RT_ERROR;
-    }
-    rt_pwm_disable(pwm_dev, 1);
-    return RT_EOK;
-}
-MSH_CMD_EXPORT(pwm_led_sample_off, pwm sample off);
-#endif
 
 #endif
 
diff --git a/bsp/n32g452xx/n32g452xx-mini-system/rtconfig.h b/bsp/n32g452xx/n32g452xx-mini-system/rtconfig.h
index 7feb290eb2..8fbf2e7e7e 100644
--- a/bsp/n32g452xx/n32g452xx-mini-system/rtconfig.h
+++ b/bsp/n32g452xx/n32g452xx-mini-system/rtconfig.h
@@ -85,6 +85,7 @@
 #define RT_SERIAL_RB_BUFSZ 64
 #define RT_USING_PIN
 #define RT_USING_PWM
+#define RT_USING_WDT
 
 /* Using USB */
 
@@ -143,9 +144,6 @@
 /* multimedia packages */
 
 
-/* U8G2: a monochrome graphic library */
-
-
 /* tools packages */
 
 
@@ -182,11 +180,5 @@
 #define RT_USING_GPIO
 #define BSP_USING_UART
 #define BSP_USING_UART1
-#define BSP_USING_PWM
-#define BSP_USING_TIM3
-#define BSP_USING_TIM3_CH1
-#define BSP_USING_TIM3_CH2
-#define BSP_USING_TIM3_CH3
-#define BSP_USING_TIM3_CH4
 
 #endif
diff --git a/bsp/stm32/libraries/HAL_Drivers/SConscript b/bsp/stm32/libraries/HAL_Drivers/SConscript
index 78a9ae9e78..dabcc7002c 100644
--- a/bsp/stm32/libraries/HAL_Drivers/SConscript
+++ b/bsp/stm32/libraries/HAL_Drivers/SConscript
@@ -106,9 +106,6 @@ if GetDepend(['BSP_USING_PULSE_ENCODER']):
 if GetDepend(['BSP_USING_USBH']):
     src += ['drv_usbh.c']
 
-if GetDepend(['PKG_USING_TINYUSB']):
-    src += ['drv_tinyusb.c']
-
 src += ['drv_common.c']
 
 path =  [cwd]
diff --git a/bsp/stm32/libraries/HAL_Drivers/drv_tinyusb.c b/bsp/stm32/libraries/HAL_Drivers/drv_tinyusb.c
deleted file mode 100644
index 5219721ea5..0000000000
--- a/bsp/stm32/libraries/HAL_Drivers/drv_tinyusb.c
+++ /dev/null
@@ -1,46 +0,0 @@
-/*
- * Copyright (c) 2006-2021, RT-Thread Development Team
- *
- * SPDX-License-Identifier: Apache-2.0
- *
- * Change Logs:
- * Date           Author       Notes
- * 2021-10-20     tfx2001      first version
- */
-
-#ifdef PKG_USING_TINYUSB
-
-#include <tusb.h>
-#include <drv_config.h>
-
-int tusb_board_init(void)
-{
-    PCD_HandleTypeDef hpcd;
-
-    memset(&hpcd, 0, sizeof(hpcd));
-    /* Set LL Driver parameters */
-    hpcd.Instance = USBD_INSTANCE;
-    hpcd.Init.dev_endpoints = 8;
-    hpcd.Init.speed = USBD_PCD_SPEED;
-#if defined(SOC_SERIES_STM32F3) || defined(SOC_SERIES_STM32F4)
-    hpcd.Init.ep0_mps = EP_MPS_64;
-#else
-    hpcd.Init.ep0_mps = DEP0CTL_MPS_64;
-#endif
-#if !defined(SOC_SERIES_STM32F1)
-    hpcd.Init.phy_itface = USBD_PCD_PHY_MODULE;
-#endif
-    /* Initialize LL Driver */
-    HAL_PCD_Init(&hpcd);
-    /* USB interrupt Init */
-    HAL_NVIC_SetPriority(USBD_IRQ_TYPE, 2, 0);
-    HAL_NVIC_EnableIRQ(USBD_IRQ_TYPE);
-    return 0;
-}
-
-void USBD_IRQ_HANDLER(void)
-{
-    tud_int_handler(0);
-}
-
-#endif
diff --git a/bsp/stm32/stm32l475-atk-pandora/board/ports/lvgl/lv_port_disp.c b/bsp/stm32/stm32l475-atk-pandora/board/ports/lvgl/lv_port_disp.c
index 513ea763c4..dc89df722f 100644
--- a/bsp/stm32/stm32l475-atk-pandora/board/ports/lvgl/lv_port_disp.c
+++ b/bsp/stm32/stm32l475-atk-pandora/board/ports/lvgl/lv_port_disp.c
@@ -11,13 +11,14 @@
 #include <drv_lcd.h>
 
 #define MY_DISP_HOR_RES LCD_W
+#define DISP_BUFFER_LINES 10
 
 /*A static or global variable to store the buffers*/
 static lv_disp_draw_buf_t disp_buf;
 
 /*Static or global buffer(s). The second buffer is optional*/
-static lv_color_t buf_1[MY_DISP_HOR_RES * 10];
-static lv_color_t buf_2[MY_DISP_HOR_RES * 10];
+static lv_color_t buf_1[MY_DISP_HOR_RES * DISP_BUFFER_LINES];
+static lv_color_t buf_2[MY_DISP_HOR_RES * DISP_BUFFER_LINES];
 
 static lv_disp_drv_t disp_drv;  /*Descriptor of a display driver*/
 
@@ -26,6 +27,7 @@ static lv_disp_drv_t disp_drv;  /*Descriptor of a display driver*/
  *'lv_disp_flush_ready()' has to be called when finished.*/
 static void disp_flush(lv_disp_drv_t * disp_drv, const lv_area_t * area, lv_color_t * color_p)
 {
+    /* color_p is a buffer pointer; the buffer is provided by LVGL */
     lcd_fill_array(area->x1, area->y1, area->x2, area->y2, color_p);
 
     /*IMPORTANT!!!
@@ -36,13 +38,13 @@ static void disp_flush(lv_disp_drv_t * disp_drv, const lv_area_t * area, lv_colo
 void lv_port_disp_init(void)
 {
     /*Initialize `disp_buf` with the buffer(s). With only one buffer use NULL instead buf_2 */
-    lv_disp_draw_buf_init(&disp_buf, buf_1, buf_2, MY_DISP_HOR_RES*10);
+    lv_disp_draw_buf_init(&disp_buf, buf_1, buf_2, MY_DISP_HOR_RES * DISP_BUFFER_LINES);
 
     lv_disp_drv_init(&disp_drv); /*Basic initialization*/
 
     /*Set the resolution of the display*/
-    disp_drv.hor_res = MY_DISP_HOR_RES;
-    disp_drv.ver_res = MY_DISP_HOR_RES;
+    disp_drv.hor_res = LCD_W;
+    disp_drv.ver_res = LCD_H;
 
     /*Set a display buffer*/
     disp_drv.draw_buf = &disp_buf;
diff --git a/bsp/thead-smart/gcc_csky.ld b/bsp/thead-smart/gcc_csky.ld
index f7cc25e822..1bdf60e7ba 100644
--- a/bsp/thead-smart/gcc_csky.ld
+++ b/bsp/thead-smart/gcc_csky.ld
@@ -44,7 +44,7 @@ SECTIONS
   .text : AT(ADDR(.text)){
   . = ALIGN(0x4) ;
   __stext = . ;
-  KEEP(*startup.o(*.text*))
+  KEEP(*startup_gcc.o(*.text*))
   *(.text)
   *(.text*)
   *(.text.*)
diff --git a/components/libc/Kconfig b/components/libc/Kconfig
index b70e0162fb..94793be569 100644
--- a/components/libc/Kconfig
+++ b/components/libc/Kconfig
@@ -2,7 +2,8 @@ menu "POSIX layer and C standard library"
 
 config RT_USING_LIBC
     bool "Enable libc APIs from toolchain"
-    default y
+    select RT_USING_HEAP
+    default n
 
 if RT_USING_LIBC
     config RT_LIBC_USING_TIME
diff --git a/components/libc/compilers/armlibc/mem_std.c b/components/libc/compilers/armlibc/mem_std.c
index fbfd17eee1..f8a81c7873 100644
--- a/components/libc/compilers/armlibc/mem_std.c
+++ b/components/libc/compilers/armlibc/mem_std.c
@@ -4,40 +4,68 @@
  * SPDX-License-Identifier: Apache-2.0
  *
  * Change Logs:
- * 2014-08-03     bernard      Add file header.
+ * Date           Author       Notes
+ * 2014-08-03     bernard      Add file header
+ * 2021-11-13     Meco Man     implement no-heap warning
  */
 
 #include <rtthread.h>
 #include <stddef.h>
 
-#ifdef RT_USING_HEAP
+#ifndef RT_USING_HEAP
+#define DBG_TAG    "armlibc.mem"
+#define DBG_LVL    DBG_INFO
+#include <rtdbg.h>
+
+#define _NO_HEAP_ERROR()  do{LOG_E("Please enable RT_USING_HEAP");\
+                             RT_ASSERT(0);\
+                            }while(0)
+#endif /* RT_USING_HEAP */
 
 #ifdef __CC_ARM
 /* avoid the heap and heap-using library functions supplied by arm */
 #pragma import(__use_no_heap)
-#endif
+#endif /* __CC_ARM */
 
 void *malloc(size_t n)
 {
+#ifdef RT_USING_HEAP
     return rt_malloc(n);
+#else
+    _NO_HEAP_ERROR();
+    return RT_NULL;
+#endif
 }
 RTM_EXPORT(malloc);
 
 void *realloc(void *rmem, size_t newsize)
 {
+#ifdef RT_USING_HEAP
     return rt_realloc(rmem, newsize);
+#else
+    _NO_HEAP_ERROR();
+    return RT_NULL;
+#endif
 }
 RTM_EXPORT(realloc);
 
 void *calloc(size_t nelem, size_t elsize)
 {
+#ifdef RT_USING_HEAP
     return rt_calloc(nelem, elsize);
+#else
+    _NO_HEAP_ERROR();
+    return RT_NULL;
+#endif
 }
 RTM_EXPORT(calloc);
 
 void free(void *rmem)
 {
+#ifdef RT_USING_HEAP
     rt_free(rmem);
+#else
+    _NO_HEAP_ERROR();
+#endif
 }
 RTM_EXPORT(free);
-#endif
diff --git a/components/libc/compilers/armlibc/syscalls.c b/components/libc/compilers/armlibc/syscalls.c
index 62657a4b64..b6448f2165 100644
--- a/components/libc/compilers/armlibc/syscalls.c
+++ b/components/libc/compilers/armlibc/syscalls.c
@@ -144,38 +144,48 @@ int _sys_close(FILEHANDLE fh)
  */
 int _sys_read(FILEHANDLE fh, unsigned char *buf, unsigned len, int mode)
 {
-#ifdef RT_USING_POSIX_STDIO
+#ifdef RT_USING_POSIX
     int size;
 
     if (fh == STDIN)
     {
+#ifdef RT_USING_POSIX_STDIO
         if (libc_stdio_get_console() < 0)
         {
             LOG_W("Do not invoke standard output before initializing libc");
-            return 0;
+            return 0; /* error, but keep going */
         }
         size = read(STDIN_FILENO, buf, len);
-        return len - size;
+        return 0; /* success */
+#else
+        return 0; /* error */
+#endif
     }
-    else if ((fh == STDOUT) || (fh == STDERR))
+    else if (fh == STDOUT || fh == STDERR)
     {
         return 0; /* error */
     }
-
-    size = read(fh, buf, len);
-    if (size >= 0)
-        return len - size;
     else
-        return 0; /* error */
+    {
+        size = read(fh, buf, len);
+        if (size >= 0)
+            return len - size; /* success */
+        else
+            return 0; /* error */
+    }
 #else
     return 0; /* error */
-#endif /* RT_USING_POSIX_STDIO */
+#endif /* RT_USING_POSIX */
 }
 
 /*
  * Write to a file. Returns 0 on success, negative on error, and
  * the number of characters _not_ written on partial success.
  * `mode' exists for historical reasons and must be ignored.
+ * The return value is either:
+ * A positive number representing the number of characters not written
+ * (so any nonzero return value denotes a failure of some sort).
+ * A negative number indicating an error.
  */
 int _sys_write(FILEHANDLE fh, const unsigned char *buf, unsigned len, int mode)
 {
@@ -183,39 +193,36 @@ int _sys_write(FILEHANDLE fh, const unsigned char *buf, unsigned len, int mode)
     int size;
 #endif /* RT_USING_POSIX */
 
-    if ((fh == STDOUT) || (fh == STDERR))
+    if (fh == STDOUT || fh == STDERR)
     {
-#ifdef RT_USING_POSIX_STDIO
-        if (libc_stdio_get_console() < 0)
+#ifdef RT_USING_CONSOLE
+        rt_device_t console;
+        console = rt_console_get_device();
+        if (console)
         {
-            LOG_W("Do not invoke standard input before initializing libc");
-            return 0;
+            rt_device_write(console, -1, buf, len);
         }
-        size = write(STDOUT_FILENO, buf, len);
-        return len - size;
-#elif defined(RT_USING_CONSOLE)
-        if (rt_console_get_device())
-        {
-            rt_device_write(rt_console_get_device(), -1, buf, len);
-        }
-
+        return 0; /* success */
+#else
         return 0; /* error */
-#endif /* RT_USING_POSIX_STDIO */
+#endif /* RT_USING_CONSOLE */
     }
     else if (fh == STDIN)
     {
         return 0; /* error */
     }
-
-#ifdef RT_USING_POSIX
-    size = write(fh, buf, len);
-    if (size >= 0)
-        return len - size;
     else
-        return 0; /* error */
+    {
+#ifdef RT_USING_POSIX
+        size = write(fh, buf, len);
+        if (size >= 0)
+            return 0; /* success */
+        else
+            return 0; /* error */
 #else
-    return 0;
+        return 0; /* error */
 #endif /* RT_USING_POSIX */
+    }
 }
 
 /*
diff --git a/components/libc/compilers/common/fcntl.h b/components/libc/compilers/common/nogcc/fcntl.h
similarity index 84%
rename from components/libc/compilers/common/fcntl.h
rename to components/libc/compilers/common/nogcc/fcntl.h
index 3460926708..51ee1024a8 100644
--- a/components/libc/compilers/common/fcntl.h
+++ b/components/libc/compilers/common/nogcc/fcntl.h
@@ -12,10 +12,9 @@
 
 #include <sys/types.h>
 
-#define O_RDONLY    0x0000      /* open for reading only */
-#define O_WRONLY    0x0001      /* open for writing only */
-#define O_RDWR      0x0002      /* open for reading and writing */
-#define O_ACCMODE   0x0003      /* mask for above modes */
+#define O_RDONLY         00
+#define O_WRONLY         01
+#define O_RDWR           02
 
 #define O_CREAT        0100
 #define O_EXCL         0200
@@ -30,6 +29,7 @@
 #define O_DIRECTORY 0200000
 #define O_NOFOLLOW  0400000
 #define O_CLOEXEC  02000000
+
 #define O_ASYNC      020000
 #define O_DIRECT     040000
 #define O_LARGEFILE 0100000
@@ -37,9 +37,12 @@
 #define O_PATH    010000000
 #define O_TMPFILE 020200000
 #define O_NDELAY O_NONBLOCK
+
 #define O_SEARCH  O_PATH
 #define O_EXEC    O_PATH
 
+#define O_ACCMODE (03|O_SEARCH)
+
 #define F_DUPFD  0
 #define F_GETFD  1
 #define F_SETFD  2
diff --git a/components/libc/compilers/common/nogcc/unistd.h b/components/libc/compilers/common/nogcc/unistd.h
index cd77a12e3b..9b96d45adb 100644
--- a/components/libc/compilers/common/nogcc/unistd.h
+++ b/components/libc/compilers/common/nogcc/unistd.h
@@ -7,4 +7,3 @@
  * Date           Author       Notes
  */
 #include "sys/unistd.h"
-
diff --git a/components/libc/compilers/dlib/syscall_close.c b/components/libc/compilers/dlib/syscall_close.c
index 2897c2418a..aef9673153 100644
--- a/components/libc/compilers/dlib/syscall_close.c
+++ b/components/libc/compilers/dlib/syscall_close.c
@@ -8,10 +8,16 @@
  * 2015-01-28     Bernard      first version
  */
 #include <rtthread.h>
-#include <yfuns.h>
+#include <LowLevelIOInterface.h>
 #include <unistd.h>
 
+/*
+ * The "__close" function should close the file corresponding to
+ * "handle".  It should return 0 on success and nonzero on failure.
+ */
+
 #pragma module_name = "?__close"
+
 int __close(int handle)
 {
     if (handle == _LLIO_STDOUT ||
diff --git a/components/libc/compilers/dlib/syscall_lseek.c b/components/libc/compilers/dlib/syscall_lseek.c
index 4ea55ef1c3..b1547f699e 100644
--- a/components/libc/compilers/dlib/syscall_lseek.c
+++ b/components/libc/compilers/dlib/syscall_lseek.c
@@ -8,10 +8,25 @@
  * 2015-01-28     Bernard      first version
  */
 #include <rtthread.h>
-#include <yfuns.h>
+#include <LowLevelIOInterface.h>
 #include <unistd.h>
 
+/*
+ * The "__lseek" function makes the next file operation (__read or
+ * __write) act on a new location.  The parameter "whence" specifies
+ * how the "offset" parameter should be interpreted according to the
+ * following table:
+ *
+ *  0 (=SEEK_SET) - Goto location "offset".
+ *  1 (=SEEK_CUR) - Go "offset" bytes from the current location.
+ *  2 (=SEEK_END) - Go to "offset" bytes from the end.
+ *
+ * This function should return the current file position, or -1 on
+ * failure.
+ */
+
 #pragma module_name = "?__lseek"
+
 long __lseek(int handle, long offset, int whence)
 {
     if (handle == _LLIO_STDOUT ||
diff --git a/components/libc/compilers/dlib/syscall_mem.c b/components/libc/compilers/dlib/syscall_mem.c
index 9c6de64455..74b960f0b9 100644
--- a/components/libc/compilers/dlib/syscall_mem.c
+++ b/components/libc/compilers/dlib/syscall_mem.c
@@ -6,27 +6,55 @@
  * Change Logs:
  * Date           Author       Notes
  * 2015-01-28     Bernard      first version
+ * 2021-11-13     Meco Man     implement no-heap warning
  */
 #include <rtthread.h>
+#include <stddef.h>
 
+#ifndef RT_USING_HEAP
+#define DBG_TAG    "dlib.syscall_mem"
+#define DBG_LVL    DBG_INFO
+#include <rtdbg.h>
+#define _NO_HEAP_ERROR()  do{LOG_E("Please enable RT_USING_HEAP");\
+                             RT_ASSERT(0);\
+                            }while(0)
+#endif /* RT_USING_HEAP */
+
+void *malloc(size_t n)
+{
 #ifdef RT_USING_HEAP
-void *malloc(rt_size_t n)
-{
     return rt_malloc(n);
+#else
+    _NO_HEAP_ERROR();
+    return RT_NULL;
+#endif
 }
 
-void *realloc(void *rmem, rt_size_t newsize)
+void *realloc(void *rmem, size_t newsize)
 {
+#ifdef RT_USING_HEAP
     return rt_realloc(rmem, newsize);
+#else
+    _NO_HEAP_ERROR();
+    return RT_NULL;
+#endif
 }
 
-void *calloc(rt_size_t nelem, rt_size_t elsize)
+void *calloc(size_t nelem, size_t elsize)
 {
+#ifdef RT_USING_HEAP
     return rt_calloc(nelem, elsize);
+#else
+    _NO_HEAP_ERROR();
+    return RT_NULL;
+#endif
 }
 
 void free(void *rmem)
 {
+#ifdef RT_USING_HEAP
     rt_free(rmem);
-}
+#else
+    _NO_HEAP_ERROR();
 #endif
+}
diff --git a/components/libc/compilers/dlib/syscall_open.c b/components/libc/compilers/dlib/syscall_open.c
index 8fb3c3a11f..3336bc8885 100644
--- a/components/libc/compilers/dlib/syscall_open.c
+++ b/components/libc/compilers/dlib/syscall_open.c
@@ -9,9 +9,14 @@
 */
 
 #include <rtthread.h>
-#include <yfuns.h>
+#include <LowLevelIOInterface.h>
 #include <fcntl.h>
 
+/*
+ * The "__open" function opens the file named "filename" as specified
+ * by "mode".
+ */
+
 #pragma module_name = "?__open"
 
 int __open(const char *filename, int mode)
diff --git a/components/libc/compilers/dlib/syscall_read.c b/components/libc/compilers/dlib/syscall_read.c
index c926c577b5..e88f88ead4 100644
--- a/components/libc/compilers/dlib/syscall_read.c
+++ b/components/libc/compilers/dlib/syscall_read.c
@@ -9,7 +9,7 @@
  */
 
 #include <rtthread.h>
-#include <yfuns.h>
+#include <LowLevelIOInterface.h>
 #include <unistd.h>
 #ifdef RT_USING_POSIX_STDIO
 #include "libc.h"
@@ -19,20 +19,36 @@
 #define DBG_LVL    DBG_INFO
 #include <rtdbg.h>
 
+/*
+ * The "__read" function reads a number of bytes, at most "size" into
+ * the memory area pointed to by "buffer".  It returns the number of
+ * bytes read, 0 at the end of the file, or _LLIO_ERROR if failure
+ * occurs.
+ *
+ * The template implementation below assumes that the application
+ * provides the function "MyLowLevelGetchar".  It should return a
+ * character value, or -1 on failure.
+ */
+
 #pragma module_name = "?__read"
+
 size_t __read(int handle, unsigned char *buf, size_t len)
 {
-#ifdef RT_USING_POSIX_STDIO
+#ifdef RT_USING_POSIX
     int size;
 
     if (handle == _LLIO_STDIN)
     {
+#ifdef RT_USING_POSIX_STDIO
         if (libc_stdio_get_console() < 0)
         {
             LOG_W("Do not invoke standard input before initializing libc");
-            return 0;
+            return 0; /* error, but keep going */
         }
-        return read(STDIN_FILENO, buf, len);
+        return read(STDIN_FILENO, buf, len); /* return the length of the data read */
+#else
+        return _LLIO_ERROR;
+#endif /* RT_USING_POSIX_STDIO */
     }
     else if ((handle == _LLIO_STDOUT) || (handle == _LLIO_STDERR))
     {
@@ -40,7 +56,7 @@ size_t __read(int handle, unsigned char *buf, size_t len)
     }
 
     size = read(handle, buf, len);
-    return size;
+    return size; /* return the length of the data read */
 #else
     return _LLIO_ERROR;
 #endif /* RT_USING_POSIX */
diff --git a/components/libc/compilers/dlib/syscall_remove.c b/components/libc/compilers/dlib/syscall_remove.c
index 05bfbb67ae..cf6541132a 100644
--- a/components/libc/compilers/dlib/syscall_remove.c
+++ b/components/libc/compilers/dlib/syscall_remove.c
@@ -8,15 +8,21 @@
  * 2015-01-28     Bernard      first version
  */
 #include <rtthread.h>
-#include <yfuns.h>
+#include <LowLevelIOInterface.h>
 #include <unistd.h>
 
+/*
+ * The "remove" function should remove the file named "filename".  It
+ * should return 0 on success and nonzero on failure.
+ */
+
 #pragma module_name = "?remove"
-int remove(const char *val)
+
+int remove(const char *filename)
 {
 #ifdef RT_USING_POSIX
-    return unlink(val);
+    return unlink(filename);
 #else
-    return -1;
+    return _LLIO_ERROR;
 #endif /* RT_USING_POSIX */
 }
diff --git a/components/libc/compilers/dlib/syscall_write.c b/components/libc/compilers/dlib/syscall_write.c
index 72bac6ba49..9a7707e9d3 100644
--- a/components/libc/compilers/dlib/syscall_write.c
+++ b/components/libc/compilers/dlib/syscall_write.c
@@ -9,7 +9,7 @@
  */
 
 #include <rtthread.h>
-#include <yfuns.h>
+#include <LowLevelIOInterface.h>
 #include <unistd.h>
 #ifdef RT_USING_POSIX_STDIO
 #include "libc.h"
@@ -19,6 +19,20 @@
 #define DBG_LVL    DBG_INFO
 #include <rtdbg.h>
 
+/*
+ * The "__write" function should output "size" number of bytes from
+ * "buffer" in some application-specific way.  It should return the
+ * number of characters written, or _LLIO_ERROR on failure.
+ *
+ * If "buffer" is zero then __write should perform flushing of
+ * internal buffers, if any.  In this case "handle" can be -1 to
+ * indicate that all handles should be flushed.
+ *
+ * The template implementation below assumes that the application
+ * provides the function "MyLowLevelPutchar".  It should return the
+ * character written, or -1 on failure.
+ */
+
 #pragma module_name = "?__write"
 
 size_t __write(int handle, const unsigned char *buf, size_t len)
@@ -29,36 +43,31 @@ size_t __write(int handle, const unsigned char *buf, size_t len)
 
     if ((handle == _LLIO_STDOUT) || (handle == _LLIO_STDERR))
     {
-#ifdef RT_USING_POSIX_STDIO
-        if (libc_stdio_get_console() < 0)
-        {
-            LOG_W("Do not invoke standard output before initializing libc");
-            return 0;
-        }
-        return write(STDOUT_FILENO, (void*)buf, len);
-#elif defined(RT_USING_CONSOLE)
+#ifdef RT_USING_CONSOLE
         rt_device_t console_device;
 
         console_device = rt_console_get_device();
-        if (console_device != 0)
+        if (console_device)
         {
             rt_device_write(console_device, 0, buf, len);
         }
 
-        return len;
+        return len; /* return the length of the data written */
 #else
         return _LLIO_ERROR;
-#endif /* RT_USING_POSIX */
+#endif /* RT_USING_CONSOLE */
     }
     else if (handle == _LLIO_STDIN)
     {
         return _LLIO_ERROR;
     }
-
+    else
+    {
 #ifdef RT_USING_POSIX
-    size = write(handle, buf, len);
-    return size;
+        size = write(handle, buf, len);
+        return size; /* return the length of the data written */
 #else
-    return _LLIO_ERROR;
+        return _LLIO_ERROR;
 #endif /* RT_USING_POSIX */
+    }
 }
diff --git a/components/libc/compilers/gcc/newlib/fcntl.h b/components/libc/compilers/gcc/newlib/fcntl.h
new file mode 100644
index 0000000000..239eaaef0d
--- /dev/null
+++ b/components/libc/compilers/gcc/newlib/fcntl.h
@@ -0,0 +1,23 @@
+/*
+ * Copyright (c) 2006-2021, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2021-09-02     Meco Man     First version
+ */
+#ifndef __FCNTL_H__
+#define __FCNTL_H__
+
+#include <sys/_default_fcntl.h>
+
+#ifndef O_DIRECTORY
+#define O_DIRECTORY 0x200000
+#endif
+
+#ifndef O_BINARY
+#define O_BINARY 0x10000
+#endif
+
+#endif
diff --git a/components/libc/compilers/gcc/newlib/syscalls.c b/components/libc/compilers/gcc/newlib/syscalls.c
index e957aaf003..f3a2f5bfcf 100644
--- a/components/libc/compilers/gcc/newlib/syscalls.c
+++ b/components/libc/compilers/gcc/newlib/syscalls.c
@@ -80,7 +80,7 @@ void _free_r (struct _reent *ptr, void *addr)
 void *
 _sbrk_r(struct _reent *ptr, ptrdiff_t incr)
 {
-    LOG_E("Please enable RT_USING_HEAP or RT_USING_LIBC");
+    LOG_E("Please enable RT_USING_HEAP");
     RT_ASSERT(0);
     return RT_NULL;
 }
@@ -109,7 +109,12 @@ int _getpid_r(struct _reent *ptr)
 
 int _close_r(struct _reent *ptr, int fd)
 {
+#ifdef RT_USING_POSIX
     return close(fd);
+#else
+    ptr->_errno = ENOTSUP;
+    return -1;
+#endif
 }
 
 int _execve_r(struct _reent *ptr, const char * name, char *const *argv, char *const *env)
@@ -216,13 +221,27 @@ int _open_r(struct _reent *ptr, const char *file, int flags, int mode)
 
 _ssize_t _read_r(struct _reent *ptr, int fd, void *buf, size_t nbytes)
 {
-#ifdef RT_USING_POSIX_STDIO
+#ifdef RT_USING_POSIX
     _ssize_t rc;
-    if (libc_stdio_get_console() < 0 && fd == STDIN_FILENO)
+    if (fd == STDIN_FILENO)
     {
-        LOG_W("Do not invoke standard input before initializing libc");
-        return 0;
+#ifdef RT_USING_POSIX_STDIO
+        if (libc_stdio_get_console() < 0)
+        {
+            LOG_W("Do not invoke standard input before initializing libc");
+            return 0;
+        }
+#else
+        ptr->_errno = ENOTSUP;
+        return -1;
+#endif /* RT_USING_POSIX_STDIO */
     }
+    else if (fd == STDOUT_FILENO || fd == STDERR_FILENO)
+    {
+        ptr->_errno = ENOTSUP;
+        return -1;
+    }
+
     rc = read(fd, buf, nbytes);
     return rc;
 #else
@@ -271,27 +290,34 @@ _ssize_t _write_r(struct _reent *ptr, int fd, const void *buf, size_t nbytes)
 {
 #ifdef RT_USING_POSIX
     _ssize_t rc;
-#ifdef RT_USING_POSIX_STDIO
-    if (libc_stdio_get_console() < 0 && fd == STDOUT_FILENO)
-    {
-        LOG_W("Do not invoke standard output before initializing libc");
-        return 0;
-    }
-#endif /* RT_USING_POSIX_STDIO */
-    rc = write(fd, buf, nbytes);
-    return rc;
-#elif defined(RT_USING_CONSOLE)
-    if (STDOUT_FILENO == fd)
+#endif /* RT_USING_POSIX */
+
+    if (fd == STDOUT_FILENO || fd == STDERR_FILENO)
     {
+#ifdef RT_USING_CONSOLE
         rt_device_t console;
 
         console = rt_console_get_device();
         if (console)
             return rt_device_write(console, -1, buf, nbytes);
+#else
+        ptr->_errno = ENOTSUP;
+        return -1;
+#endif /* RT_USING_CONSOLE */
     }
-#endif /* RT_USING_POSIX */
+    else if (fd == STDIN_FILENO)
+    {
+        ptr->_errno = ENOTSUP;
+        return -1;
+    }
+
+#ifdef RT_USING_POSIX
+    rc = write(fd, buf, nbytes);
+    return rc;
+#else
     ptr->_errno = ENOTSUP;
     return -1;
+#endif /* RT_USING_POSIX */
 }
 
 /* for exit() and abort() */