20 关于IMX. RT 1052系列BSP 的spi驱动

发布于 2020-08-27 14:31:06 浏览：1826 订阅该版

有哪位老铁使用了imx.rt1052的spi驱动?自己测了一下，最终spi时序有错。
测试如下：
1、使用MCUXpresso 配置了spi4的相关引脚：
![image.png](/uploads/20200827/dce49cecb79bc55175d1c5e57737209f.png)
2、配置使能
![image.png](/uploads/20200827/8b710a0e3587164a78ca1037d94acc1a.png)

3、挂载spi设备
```c
#define ADS1220_SPI_DEVICE_NAME     "spi40"
#define ADS1220_SPI_BUS_NAME        "spi4"
static  struct rt_spi_device* spi_dev_ads1220; /* SPI设备ads1220对象 */

static int ads1220_spi_init(void)
{
    rt_err_t ret;
    struct rt_spi_configuration cfg;

ret = rt_hw_spi_device_attach(ADS1220_SPI_BUS_NAME,ADS1220_SPI_DEVICE_NAME,GET_PIN(2,20));

if(ret != RT_EOK)
    {
        LOG_E("ads1220 spi attach spi4 failed!");
        return -RT_ERROR;
    }
    
    cfg.data_width = 8;
    cfg.mode = RT_SPI_MASTER|RT_SPI_MODE_1|RT_SPI_MSB ;
    cfg.max_hz = 500*1000;

spi_dev_ads1220 = (struct rt_spi_device*) rt_device_find(ADS1220_SPI_DEVICE_NAME);
    ret = rt_spi_configure(spi_dev_ads1220,&cfg);
    if(ret != RT_EOK)
    {
        LOG_E("ads1220 spi configure failed!");
        return -RT_ERROR;
    }
    return RT_EOK;
}
/* 导出到自动初始化 */
INIT_COMPONENT_EXPORT(ads1220_spi_init);
```
查看设备，注册成功。
![image.png](/uploads/20200827/cf9c8ba2c7d650d6f212473bae711147.png)

4、测试发一个数据
```c
static void spi_ads1220_sample(void)
{
    uint8_t reg_data = 0;
    rt_err_t ret = RT_EOK;
    rt_size_t size;
     rt_uint8_t cmd = 0x20;
    spi_dev_ads1220 =(struct rt_spi_device*)     
    rt_device_find(ADS1220_SPI_DEVICE_NAME);
    if(!spi_dev_ads1220)
    {
         rt_kprintf("can't find %s device!\n",         
                     ADS1220_SPI_DEVICE_NAME);
    }
    else
    {
        while(1)
        {
            size = rt_spi_send(spi_dev_ads1220,&cmd,1);
            if(size != 0)
            {
                LOG_D("ads1220发送信息成功!");
            }
            else
            {
                LOG_E("ads1220发送信息失败!");  
            }    
            rt_thread_mdelay(500);
        }
    } 
}
```

最终逻辑分析仪抓取波形，cs电平有问题。
![image.png](/uploads/20200827/fcb232d515ab9c52fc062e3eaa5cc633.png)