INIT_BOARD_EXPORT(uart_init);

发布于 2022-05-04 16:09:07 浏览：599 订阅该版

2 个回答

F1ma 2022-05-04

这家伙很懒，什么也没写！

```
void rt_hw_board_init(void)
{
    extern void SystemClock_Config(void);
    
    HAL_Init();
    SystemClock_Config();
    SystemCoreClockUpdate();
    /* 
     * 1: OS Tick Configuration
     * Enable the hardware timer and call the rt_os_tick_callback function
     * periodically with the frequency RT_TICK_PER_SECOND. 
     */
    HAL_SYSTICK_Config(HAL_RCC_GetHCLKFreq()/RT_TICK_PER_SECOND);

/* Call components board initial (use INIT_BOARD_EXPORT()) */
#ifdef RT_USING_COMPONENTS_INIT 
    rt_components_board_init();
#endif

#if defined(RT_USING_USER_MAIN) && defined(RT_USING_HEAP)
    rt_system_heap_init(rt_heap_begin_get(), rt_heap_end_get());
#endif
}

#ifdef RT_USING_CONSOLE

static UART_HandleTypeDef UartHandle;
static int uart_init(void)
{
    /* TODO: Please modify the UART port number according to your needs */
    UartHandle.Instance = USART3;
    UartHandle.Init.BaudRate = 115200;
    UartHandle.Init.WordLength = UART_WORDLENGTH_8B;
    UartHandle.Init.StopBits = UART_STOPBITS_1;
    UartHandle.Init.Parity = UART_PARITY_NONE;
    UartHandle.Init.Mode = UART_MODE_TX_RX;
    UartHandle.Init.HwFlowCtl = UART_HWCONTROL_NONE;
    UartHandle.Init.OverSampling = UART_OVERSAMPLING_16;

if (HAL_UART_Init(&UartHandle) != HAL_OK)
    {
        while (1);
    }
    return 0;
}
INIT_BOARD_EXPORT(uart_init);
```

出出啊 2022-05-05

恃人不如自恃，人之为己者不如己之自为也

F1ma 2022-05-05

这家伙很懒，什么也没写！

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追加回复

crystal266 2022-05-04

嵌入式

crystal266 2022-05-04

嵌入式

另外附上rtt串口自动初始化中函数的调用过程，说着这个分析可以分析出串口初始化的过程。

```c
rtthread_startup(components.c)
        |-> hw_board_init(drv_common.c)
            |-> rt_hw_usart_init(drv_usart.c)
                |-> rt_hw_serial_register(serial.c)
                    |-> rt_device_register(device.c)   // 注册串口设备，使用 list_device 可以看到注册的设备
                        |-> rt_object_init(object.c)
        |-> rt_console_set_device(kservice.c)
            |-> rt_device_find(device.c)      // 查找注册串口设备
            |-> rt_device_open(device.c)      // 打开串口设备
                |-> device_init(device.c)
                |-> rt_serial_init(serial.c)  // 串口设备初始化
                    |-> serial->ops->configure(serial, &serial->config);(serial.c)
                    |-> stm32_configure(drv_usart.c)
                        |-> stm32_gpio_configure(drv_usart.c)  // 串口引脚和时钟初始化
                             |-> HAL_UART_Init(libraries/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_uart.c)
                                 |-> HAL_UART_MspInit(cubemx/Src/stm32f4xx_hal_msp.c)   // 初始化串口底层硬件，CubeMX配置后生成的

```

F1ma 2022-05-05

这家伙很懒，什么也没写！

crystal266 2022-05-05

嵌入式

F1ma 2022-05-05

这家伙很懒，什么也没写！

@crystal266  链接脚本是cubemx生成的

下面是现在我的链接文件  
```
/* The program code and other data goes into FLASH */
  .text :
  {
    . = ALIGN(4);
    *(.text)           /* .text sections (code) */
    *(.text*)          /* .text* sections (code) */
    *(.glue_7)         /* glue arm to thumb code */
    *(.glue_7t)        /* glue thumb to arm code */
    *(.eh_frame)

KEEP (*(.init))
    KEEP (*(.fini))

/* section information for finsh shell */
    . = ALIGN(4);
    __fsymtab_start = .;
    KEEP(*(FSymTab))
    __fsymtab_end = .;
    . = ALIGN(4);
    __vsymtab_start = .;
    KEEP(*(VSymTab))
    __vsymtab_end = .;
    . = ALIGN(4);

/* section information for initial. */
    . = ALIGN(4);
    __rt_init_start = .;
    KEEP(*(SORT(.rti_fn*)))
    __rt_init_end = .;
    . = ALIGN(4);

_etext = .;        /* define a global symbols at end of code */
  } >FLASH
```

是加了下面那一段 .map才能生成生成
```
/* section information for finsh shell */
    . = ALIGN(4);
    __fsymtab_start = .;
    KEEP(*(FSymTab))
    __fsymtab_end = .;
    . = ALIGN(4);
    __vsymtab_start = .;
    KEEP(*(VSymTab))
    __vsymtab_end = .;
    . = ALIGN(4);

/* section information for initial. */
    . = ALIGN(4);
    __rt_init_start = .;
    KEEP(*(SORT(.rti_fn*)))
    __rt_init_end = .;
    . = ALIGN(4);
```