stm32F103通过SPI发送数据失败

发布于 2021-08-06 10:24:17 浏览：1406 订阅该版

```c
#define SPI_BUS_NAME "spi2" /* SPI总线名称 */
#define SPI_W25Q64_DEVICE_NAME "spi20" /* SPI设备名称 */

rt_uint8_t w25x_read_id = 0x90;
static struct rt_spi_device spi_dev_w25q64;
struct stm32_hw_spi_cs
{
    rt_uint32_t pin;
};
static struct stm32_hw_spi_cs spi_cs;
/*收发数据*/
rt_err_t w25q64_write_cmd(const rt_uint8_t cmd)
{
    rt_uint8_t id[5] = {0};

rt_spi_send_then_recv(&spi_dev_w25q64, &cmd, 1, id, 5);
    rt_kprintf("use rt_spi_send_then_recv() read w25q ID is:%x%x\n", id[3], id[4]);
}
/*注册spi设备*/
static int rt_hw_w25q64_config(void)
{
    rt_err_t res;

spi_cs.pin = 28;
    rt_pin_mode(spi_cs.pin, PIN_MODE_OUTPUT);    /* 设置片选管脚模式为输出 */

res = rt_spi_bus_attach_device(&spi_dev_w25q64, SPI_W25Q64_DEVICE_NAME, SPI_BUS_NAME,(void*)&spi_cs);
    if (res != RT_EOK)
    {
        rt_kprintf("rt_spi_bus_attach_device!\r\n");
        return res;
    }

/* config spi */
    {
        struct rt_spi_configuration cfg;
        cfg.data_width = 8;
        cfg.mode = RT_SPI_MASTER | RT_SPI_MODE_2 | RT_SPI_MSB;
        cfg.max_hz = 20 * 1000 *1000;

rt_spi_configure(&spi_dev_w25q64, &cfg);
    }

return RT_EOK;
}
void test()
{
        rt_hw_w25q64_config();
        w25q64_write_cmd(w25x_read_id);
}

int main(void)
{
    LOG_D("Hello RT-Thread!");
    test();
    return RT_EOK;
}
```

运行到`rt_spi_send_then_recv(&spi_dev_w25q64, &cmd, 1, id, 5);`出错。
串口返回：
```
psr: 0x01000000
r00: 0x0000001c
r01: 0x00000000
r02: 0x00000000
r03: 0x0000001c
r04: 0xdeadbeef
r05: 0xdeadbeef
r06: 0xdeadbeef
r07: 0x20001da4
r08: 0xdeadbeef
r09: 0xdeadbeef
r10: 0xdeadbeef
r11: 0xdeadbeef
r12: 0x00000000
 lr: 0x0800ae05
 pc: 0x08008140
hard fault on thread: main

thread   pri  status      sp     stack size max used left tick  error
-------- ---  ------- ---------- ----------  ------  ---------- ---
tshell    20  ready   0x00000044 0x00001000    01%   0x0000000a 000
tidle0    31  ready   0x00000040 0x00000100    25%   0x00000020 000
timer      4  suspend 0x0000007c 0x00000200    24%   0x00000009 000
main      10  running 0x00000040 0x00000800    14%   0x00000010 000
bus fault:
SCB_CFSR_BFSR:0x04 IMPRECISERR 
```