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* [components][clock_time] Refactor time subsystem around clock_time Introduce the clock_time core with clock source/event separation, high-resolution scheduling, and boot-time helpers, plus clock_timer adapters for timer peripherals. Remove legacy ktime/cputime/hwtimer implementations and migrate arch and BSP time paths to the new subsystem while keeping POSIX time integration functional. Update drivers, Kconfig/SConscript wiring, documentation, and tests; add clock_time overview docs and align naming to clock_boottime/clock_hrtimer/clock_timer. * [components][clock_time] Use BSP-provided clock timer frequency on riscv64 * [risc-v] Use runtime clock timer frequency for tick and delays * [bsp] Add clock timer frequency hooks for riscv64 boards * [bsp] Update Renesas RA driver doc clock_timer link * [bsp] Sync zynqmp-r5-axu4ev rtconfig after config refresh * [bsp][rk3500] Update rk3500 clock configuration * [bsp][hpmicro] Add rt_hw_us_delay hook and update board delays * [bsp][stm32l496-st-nucleo] enable clock_time for hwtimer sample in ci * [bsp][hpmicro] Fix rtconfig include scope for hpm6750evk Move rtconfig.h include outside the ENET_MULTIPLE_PORT guard for hpm6750evk and hpm6750evk2 so configuration macros are available regardless of ENET settings. * [bsp][raspi3] select clock time for systimer * [bsp][hpm5300evk] Trim trailing blank line * [bsp][hpm5301evklite] Trim trailing blank line * [bsp][hpm5e00evk] Trim trailing blank line * [bsp][hpm6200evk] Trim trailing blank line * [bsp][hpm6300evk] Trim trailing blank line * [bsp][hpm6750evk] Trim trailing blank line * [bsp][hpm6750evk2] Trim trailing blank line * [bsp][hpm6750evkmini] Trim trailing blank line * [bsp][hpm6800evk] Trim trailing blank line * [bsp][hpm6e00evk] Trim trailing blank line * [bsp][nxp] switch lpc178x to gcc and remove mcx timer source * [bsp][stm32] fix the CONFIG_RT_USING_CLOCK_TIME issue. * [docs][clock_time] add clock time documentation * [docs][clock_time] Update clock time subsystem documentation - Update device driver index to use correct page reference - Clarify upper layer responsibilities in architecture overview - Update README to describe POSIX/libc, Soft RTC, and device driver usage - Refine architecture diagram with improved layout and color scheme - Remove obsolete clock_timer.md file * [kernel][utest] Trim trailing space * [clock_time] Fix hrtimer wrap handling * [clock_time] fix the static rt_inline issue * [clock_time] fix the rt_clock_hrtimer_control result issue
N32G452XX MINI-SYSTEM BSP 说明
简介
N32G452 MINI-SYSTEM 是国民技术推出的一款N32G452系列的评估板(目前市面还没有，以后也可能不会有)，其搭载的MCU主要资源参数如下：
| 硬件 | 描述 |
|---|---|
| 芯片型号 | N32G452RCL7 |
| CPU | ARM Cortex M4 |
| 主频 | 144M |
| 片内SRAM | 80K可扩展144K |
| 片内FLASH | 256K |
编译说明
N32G452 MINI-SYSTEM 板级包支持MDK5开发环境和GCC编译器，以下是具体版本信息：
| IDE/编译器 | 已测试版本 |
|---|---|
| MDK5 | MDK533 |
| GCC | GCC 6.2.1 20161205 (release) |
板载资源
- MCU：N32G452RCL7，主频 144MHz，256KB FLASH ，80KB可扩展到144KB RAM
- 常用接口：插针串口J8
- 调试接口，JLINK、板载的 NS-LINK SWD 下载
外设支持
本 BSP 目前对外设驱动的支持情况如下：
| 驱动 | 支持情况 | 备注 |
|---|---|---|
| UART | 支持(已移植，已测试) | USART1/2/3 |
| GPIO | 支持(已移植，已测试) | PA0...PF7 |
| ADC | 支持(已移植，已测试) | ADC1/2 |
| PWM | 支持(已移植，已测试) | TMR1/2 |
| CLOCK_TIMER | 支持(已移植，已测试) | TMR6/7 |
IO在板级支持包中的映射情况
| IO号 | 板级包中的定义 |
|---|---|
| PA9 | USART1_TX |
| PA10 | USART1_RX |
| PA2 | USART2_TX |
| PA3 | USART2_RX |
| PB10 | USART3_TX |
| PB11 | USART3_RX |
| PA4 | SPI1_NSS |
| PA5 | SPI1_SCK |
| PA6 | SPI1_MISO |
| PA7 | SPI1_MOSI |
| PB12 | SPI2_NSS |
| PB13 | SPI2_SCK |
| PB14 | SPI2_MISO |
| PB15 | SPI2_MOSI |
| PB6 | I2C1_SCL |
| PB7 | I2C1_SDA |
| PC8 | SDIO1_D0 |
| PC9 | SDIO1_D1 |
| PC10 | SDIO1_D2 |
| PC11 | SDIO1_D3 |
| PC12 | SDIO1_CK |
| PD2 | SDIO1_CMD |
| PA8 | PWM_TMR1_CH1 |
| PA11 | PWM_TMR1_CH4 |
| PA0 | PWM_TMR2_CH1 |
| PA1 | PWM_TMR2_CH2 |
| PC0 | ADC1/2_IN10 |
| PC1 | ADC1/2_IN11 |
| PC2 | ADC1/2_IN12 |
| PC3 | ADC1/2_IN13 |
使用说明
本章节是为刚接触 RT-Thread 的新手准备的使用说明，遵循简单的步骤即可将 RT-Thread 操作系统运行在该开发板上，看到实验效果 。
快速上手
本 BSP 为开发者提供 MDK5工程，并且支持 GCC 开发环境。下面以 MDK5 开发环境为例，介绍如何将系统运行起来。
硬件连接
使用数据线连接开发板到 PC，打开电源开关。
编译下载
双击 project.uvprojx 文件，打开 MDK5 工程，编译并下载程序到开发板。
运行结果
下载程序成功之后，系统会自动运行，观察开发板上 LED 的运行效果，LED1 会周期性闪烁。
连接开发板对应串口到 PC , 在终端工具里打开相应的串口（115200-8-1-N），复位设备后，在串口上可以看到 RT-Thread 的输出信息:
\ | /
- RT - Thread Operating System
/ | \ 4.0.4 build Aug 19 2021
2006 - 2021 Copyright by rt-thread team
msh />
注意事项
- 使用 J-LINK 下载时，请设置下载完成自动复位（J-Flash设置步骤：
Options->Project settings->production->Start application），否则下载完成后手动按键复位无法启动，初步定位问题原因为：芯片下电缓慢，参考《N32G43x系列芯片电源系统设计指南》或联系FAE了解情况。
联系人信息
维护人: