RTTread的spi rt_spi_send_then_recv API 与HAl库的HAL_SPI_TransmitReceive使用是一样的吗

发布于 2023-07-26 21:34:21 浏览：511 订阅该版

我使用RTTread的spiAPI `rt_spi_send_then_recv(ble_spi, &header_master, HEADER_SIZE, &header_slave, HEADER_SIZE);`发送一个header，同时收到的回复是：0x04ff030100，即从机芯片的异常返回
![35275e3f47506aea56fb6bb03bac764.png](https://oss-club.rt-thread.org/uploads/20230726/24ab7e4acc8bc1c04bb22621c88b52c0.png)
将对应的API换成 `HAL_SPI_TransmitReceive(&hspi1, header_master, header_slave, HEADER_SIZE, BUS_SPI1_POLL_TIMEOUT);`,同时收到的回复是: 0xff09010600, 即正确的数据大小约定包
![2120e44b98f49b49cf813ca2d7c9dde.png](https://oss-club.rt-thread.org/uploads/20230726/20b1623e65ceee2af3be449dbcda640a.png)

我的SPI初始化代码如下：

```c
/* SPI  -----------------------------------------------*/
#define SPI_DEVICE_NAME     "spi10"   /* SPI 设备名称 */
struct rt_spi_device *ble_spi = RT_NULL;

ble_spi = (struct rt_spi_device *)rt_malloc(sizeof(struct rt_spi_device));
    if(RT_NULL == ble_spi)
    {
        rt_kprintf("Failed to malloc the spi device.");
        return -RT_ENOMEM;
    }
    if (RT_EOK != rt_spi_bus_attach_device(ble_spi, "spi10", "spi1", RT_NULL))
    {
        rt_kprintf("Failed to attach the spi device.");
        return -RT_ERROR;
    }

/* spi设备配置  */
    struct rt_spi_configuration cfg;
    cfg.data_width = 8;
    cfg.mode = RT_SPI_MASTER | RT_SPI_MODE_1 | RT_SPI_MSB;  // CPOL 0 CPHA 1
    cfg.max_hz =  1 * 1000 * 1000;                           /* 1M */

if (RT_EOK != rt_spi_configure(ble_spi, &cfg)) {
        rt_kprintf("Failed to config the spi device.");
        return -RT_ERROR;
    }
```
配置的数据位宽 工作模式 和频率应该都是没有问题的(否则应该不能准确收到异常返回0x04ff030100)

我点开`rt_spi_send_then_recv` 的源码看着好复杂，
这个API在发送的工作上和HAL_SPI_TransmitReceive有什么时序的区别吗