RT-Thread 添加设备初始化的方式-- INIT_BOARD_EXPORT(fn)

代码用的是rtthread_simulator_v0.1.0
最开始不知道rt-thread在哪里给硬件初始化，或者在哪里添加新硬件的初始化函数
例如要添加GPIO的初始化，和操作。

1 关键的就是INIT_BOARD_EXPORT(rt_hw_usart_init)，将串口初始化放入初始化列表中
2 rt_components_board_init(void)中执行初始化列表

    for (fn_ptr = &__rt_init_rti_board_start; fn_ptr < &__rt_init_rti_board_end; fn_ptr++)
    {
        (*fn_ptr)();
    }

下面是主要代码粘贴

//commponents.c
#ifdef RT_USING_COMPONENTS_INIT
/*
 * Components Initialization will initialize some driver and components as following
 * order:
 * rti_start         --> 0
 * BOARD_EXPORT      --> 1
 * rti_board_end     --> 1.end
 *
 * DEVICE_EXPORT     --> 2
 * COMPONENT_EXPORT  --> 3
 * FS_EXPORT         --> 4
 * ENV_EXPORT        --> 5
 * APP_EXPORT        --> 6
 *
 * rti_end           --> 6.end
 *
 * These automatically initializaiton, the driver or component initial function must
 * be defined with:
 * INIT_BOARD_EXPORT(fn);
 * INIT_DEVICE_EXPORT(fn);
 * ...
 * INIT_APP_EXPORT(fn);
 * etc.
 */
static int rti_start(void)
{
    return 0;
}
INIT_EXPORT(rti_start, "0");

static int rti_board_start(void)
{
    return 0;
}
INIT_EXPORT(rti_board_start, "0.end");

static int rti_board_end(void)
{
    return 0;
}
INIT_EXPORT(rti_board_end, "1.end");

static int rti_end(void)
{
    return 0;
}
INIT_EXPORT(rti_end, "6.end");

/**
 * RT-Thread Components Initialization for board
 */
void rt_components_board_init(void)
{
#if RT_DEBUG_INIT
    int result;
    const struct rt_init_desc *desc;
    for (desc = &__rt_init_desc_rti_board_start; desc < &__rt_init_desc_rti_board_end; desc ++)
    {
        rt_kprintf("initialize %s", desc->fn_name);
        result = desc->fn();
        rt_kprintf(":%d done\n", result);
    }
#else
    const init_fn_t *fn_ptr;

    for (fn_ptr = &__rt_init_rti_board_start; fn_ptr < &__rt_init_rti_board_end; fn_ptr++)
    {
        (*fn_ptr)();
    }
#endif
}

/**
 * RT-Thread Components Initialization
 */
void rt_components_init(void)
{
#if RT_DEBUG_INIT
    int result;
    const struct rt_init_desc *desc;

    rt_kprintf("do components intialization.\n");
    for (desc = &__rt_init_desc_rti_board_end; desc < &__rt_init_desc_rti_end; desc ++)
    {
        rt_kprintf("initialize %s", desc->fn_name);
        result = desc->fn();
        rt_kprintf(":%d done\n", result);
    }
#else
    const init_fn_t *fn_ptr;

    for (fn_ptr = &__rt_init_rti_board_end; fn_ptr < &__rt_init_rti_end; fn_ptr ++)
    {
        (*fn_ptr)();
    }
#endif
}

---

int rt_hw_usart_init(void)
{
    struct stm32_uart *uart;
    struct serial_configure config = RT_SERIAL_CONFIG_DEFAULT;

    uart = &uart1;
    config.baud_rate = BAUD_RATE_115200;
    serial1.ops    = &stm32_uart_ops;
    serial1.config = config;
    MX_USART_UART_Init(&uart->huart);
    /* register UART1 device */
    rt_hw_serial_register(&serial1, "uart1",
                          RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX,
                          uart);

    return 0;
}
INIT_BOARD_EXPORT(rt_hw_usart_init);

---

int rt_hw_pin_init(void)
{
    int result;
    result = rt_device_pin_register("pin", &_stm32_pin_ops, RT_NULL);
    return result;
}
INIT_BOARD_EXPORT(rt_hw_pin_init);

 #define INIT_EXPORT(fn, level)  RT_USED const init_fn_t __rt_init_##fn SECTION(".rti_fn."level) = fn
/* board init routines will be called in board_init() function */
#define INIT_BOARD_EXPORT(fn)           INIT_EXPORT(fn, "1")

代码包 rtthread_simulator_v0.1.0