Merge pull request #840 from caogos/master

[BSP] Add I2C driver for Loongson 1C.

bsp/ls1cdev/libraries/ls1c_gpio.c

@@ -211,8 +211,8 @@ unsigned int gpio_get(unsigned int gpio)
  */
 void gpio_set_irq_type(unsigned int gpio, gpio_irq_type_t type)
 {
-    volatile unsigned int *int_pol;     // 中断极性选择寄存器
-    volatile unsigned int *int_edge;    // 中断边沿选择寄存器
+    volatile unsigned int *int_pol = NULL;     // 中断极性选择寄存器
+    volatile unsigned int *int_edge = NULL;    // 中断边沿选择寄存器
     unsigned int port = GPIO_GET_PORT(gpio);
     unsigned int pin  = GPIO_GET_PIN(gpio);
 
@@ -257,6 +257,9 @@ void gpio_set_irq_type(unsigned int gpio, gpio_irq_type_t type)
             *int_pol    &= ~(1 << pin);
             *int_edge   &= ~(1 << pin);
             break;
+
+        default:
+            break;
     }
 
     return ;

bsp/ls1cdev/libraries/ls1c_i2c.h

@@ -0,0 +1,134 @@
+/*
+ * File      : ls1c_i2c.h
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2006 - 2012, RT-Thread Development Team
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2017-09-06     勤为本       first version
+ */
+
+
+// 硬件i2c接口的头文件
+
+#ifndef __OPENLOONGSON_I2C_H
+#define __OPENLOONGSON_I2C_H
+
+
+
+// I2C的时钟频率
+#define LS1C_I2C_CLOCK_DEFAULT              (100000)  // Hz. 默认频率
+#define LS1C_I2C_CLOCK_MAX                  (400000)  // Hz, max 400 Kbits/sec
+
+
+// I2C模块编号
+typedef enum
+{
+    LS1C_I2C_0 = 0,
+    LS1C_I2C_1,
+    LS1C_I2C_2
+}ls1c_i2c_t;
+
+
+// I2C数据传输方向
+typedef enum
+{
+    LS1C_I2C_DIRECTION_WRITE = 0,       // 主机向从机写信息
+    LS1C_I2C_DIRECTION_READ,            // 主机向从机读信息
+}ls1c_i2c_direction_t;
+
+
+// 硬件I2C信息
+typedef struct
+{
+    ls1c_i2c_t I2Cx;                    // i2c模块编号
+    unsigned long clock;                // i2c时钟频率，单位hz
+}ls1c_i2c_info_t;
+
+
+// I2C应答
+typedef enum
+{
+    LS1C_I2C_ACK = 0,                   // 收到应答
+    LS1C_I2C_NACK = 1,                  // 没收到应答
+}ls1c_i2c_ack_t;
+
+
+// 函数返回值
+typedef enum
+{
+    LS1C_I2C_RET_OK = 0,                // OK
+    LS1C_I2C_RET_TIMEOUT,               // 超时
+}ls1c_i2c_ret_t;
+
+
+
+/*
+ * 初始化指定i2c模块
+ * @i2c_info_p 某个i2c模块的信息
+ */
+void i2c_init(ls1c_i2c_info_t *i2c_info_p);
+
+
+/*
+ * (再发送一个字节数据之后)接收从机发送的ACK信号
+ * @i2c_info_p i2c模块信息
+ * @ret LS1C_I2C_ACK or LS1C_I2C_NACK
+ */
+ls1c_i2c_ack_t i2c_receive_ack(ls1c_i2c_info_t *i2c_info_p);
+
+
+/*
+ * 接收数据
+ * @i2c_info_p i2c模块信息
+ * @buf 数据缓存
+ * @len 待接收数据的长度
+ */
+ls1c_i2c_ret_t i2c_receive_data(ls1c_i2c_info_t *i2c_info_p, unsigned char *buf, int len);
+
+
+
+/*
+ * 发送START信号和地址
+ * @i2c_info_p i2c模块信息
+ * @slave_addr 从机地址
+ * @direction 数据传输方向(读、写)
+ */
+ls1c_i2c_ret_t i2c_send_start_and_addr(ls1c_i2c_info_t *i2c_info_p, 
+                                       unsigned char slave_addr,
+                                       ls1c_i2c_direction_t direction);
+
+
+/*
+ * 发送数据
+ * @i2c_info_p i2c模块信息
+ * @data 待发送的数据
+ * @len 待发送数据的长度
+ */
+ls1c_i2c_ret_t i2c_send_data(ls1c_i2c_info_t *i2c_info_p, unsigned char *data, int len);
+
+
+/*
+ * 发送STOP信号
+ * @i2c_info_p i2c模块信息
+ */
+void i2c_send_stop(ls1c_i2c_info_t *i2c_info_p);
+
+
+
+#endif
+

bsp/ls1cdev/libraries/ls1c_public.c

@@ -54,6 +54,28 @@ unsigned int reg_get_bit(volatile unsigned int *reg, unsigned int bit)
 }
 
 
+/*
+ * 向寄存器中写入8bit(一个字节)数据
+ * @data 待写入的数据
+ * @addr 寄存器地址
+ */
+void reg_write_8(unsigned char data, volatile unsigned char *addr)
+{
+    *addr = data;
+}
+
+
+/*
+ * 从寄存器读出8bit(一个字节)数据
+ * @addr 寄存器地址
+ * @ret 读出的数据
+ */
+unsigned char reg_read_8(volatile unsigned char *addr)
+{
+    return (*addr);
+}
+
+
 /*
  * 向寄存器中写一个32bit的数据
  * @data 待写入的数据

bsp/ls1cdev/libraries/ls1c_public.h

@@ -57,6 +57,22 @@ void reg_clr_one_bit(volatile unsigned int *reg, unsigned int bit);
 unsigned int reg_get_bit(volatile unsigned int *reg, unsigned int bit);
 
 
+/*
+ * 向寄存器中写入8bit(一个字节)数据
+ * @data 待写入的数据
+ * @addr 寄存器地址
+ */
+void reg_write_8(unsigned char data, volatile unsigned char *addr);
+
+
+/*
+ * 从寄存器读出8bit(一个字节)数据
+ * @addr 寄存器地址
+ * @ret 读出的数据
+ */
+unsigned char reg_read_8(volatile unsigned char *addr);
+
+
 /*
  * 向寄存器中写一个32bit的数据
  * @data 待写入的数据

bsp/ls1cdev/libraries/ls1c_regs.h

@@ -111,6 +111,11 @@
 #define LS1C_INT4_EDGE                      (0xbfd010b4)
 
 
+// I2C寄存器
+#define LS1C_I2C0_BASE                      (0xbfe58000)
+#define LS1C_I2C1_BASE                      (0xbfe68000)
+#define LS1C_I2C2_BASE                      (0xbfe70000)
+
 
 #endif