10 正点原子潘多拉STM32L475VET6开发板使用QSPI读写W25Q128FLASH时问题

发布于 2024-02-27 16:45:16 浏览：399 订阅该版

正点原子潘多拉STM32L475VET6开发板使用QSPI读写W25Q128FLASH时，读取设备ID没有问题，读数据没有问题。但是在发送写使能命令、读取设备状态寄存器1数据、写入数据时出现问题。写使能命令写不进去是怎么回事？
1、初始化代码：

```c
//qspi初始化函数
void qspi_hw_init(void)
{
    rt_base_t qspi1_nss = rt_pin_get("PE.11");
    struct rt_qspi_configuration configure_app;
    rt_err_t qspi_ret;
    qspi_ret = rt_hw_qspi_device_attach(QSPI_APP, QSPI1_APP, qspi1_nss, 1, NULL, NULL);
    if(0 == qspi_ret)
    {
        rt_kprintf("qspi attach success\n");
    }
    else
    {
        rt_kprintf("qspi attach fail\n");
    }
    qspi_device = (struct rt_qspi_device *)rt_device_find(QSPI1_APP);
    if(NULL  == qspi_device)
    {
        rt_kprintf("qspi11 find error\n");
    }
    else
    {
        rt_kprintf("qspi11 find success\n");
    }
}
2、发送写使能命令代码

```c
/**
 * @brief   使能写命令
 * @param   无
 * @param   无
 * @retval  无
 */
void SPI_FLASH_WriteEnable(void)
{
    // 发送写使能指令
    struct rt_qspi_message qspi_message;
    qspi_message.parent.send_buf = NULL;
    qspi_message.parent.recv_buf = NULL;
    qspi_message.parent.length = 0;
    qspi_message.parent.next = RT_NULL;
    qspi_message.parent.cs_take = 1;
    qspi_message.parent.cs_release = 1;
    qspi_message.instruction.content = ManufactDeviceID_CMD;    //指令
    qspi_message.instruction.qspi_lines = 1;    //指令模式
    qspi_message.address.content = 0;   //地址
    qspi_message.address.size = 8;  //地址长度
    qspi_message.address.qspi_lines = 0;    //地址模式
    qspi_message.dummy_cycles = 0;  //空指令周期
    qspi_message.qspi_data_lines = 0;   //数据模式
    rt_qspi_transfer_message(qspi_device,&qspi_message);
}
```
3、读状态寄存器代码
```c
//读状态寄存器1函数
uint8_t read_status_1(void)
{
    uint8_t status = 0;
    // 发送读取数据指令
    struct rt_qspi_message qspi_message;
    qspi_message.parent.send_buf = NULL;
    qspi_message.parent.recv_buf = &status;
    qspi_message.parent.length = 1;
    qspi_message.parent.next = RT_NULL;
    qspi_message.parent.cs_take = 1;
    qspi_message.parent.cs_release = 1;
    qspi_message.instruction.content = Read_Status_Register_1_CMD;    //指令
    qspi_message.instruction.qspi_lines = 1;    //指令模式
    qspi_message.address.content = 0;   //地址
    qspi_message.address.size = 24;  //地址长度
    qspi_message.address.qspi_lines = 0;    //地址模式
    qspi_message.dummy_cycles = 0;  //空指令周期
    qspi_message.qspi_data_lines = 1;   //数据模式
    rt_qspi_transfer_message(qspi_device,&qspi_message);
    return status;
}
```
4、写入数据代码

```c
/**
 * @brief   对 FLASH 按页写入数据，调用本函数写入数据前需要先擦除扇区
 * @param   pBuffer：要写入数据的指针
 * @param   WriteAddr：写入数据地址
 * @param   NumByteToWrite：写入数据长度（以字节为单位）。必须小于等于SPI_FLASH_PerWritePageSize
 * @retval  无
 */
void SPI_FLASH_PageWrite(uint8_t *pBuffer, uint32_t WriteAddr, uint16_t NumByteToWrite)
{
    // 使能写命令
    SPI_FLASH_WriteEnable();
    // 发送页写入指令
    struct rt_qspi_message qspi_message;
    qspi_message.parent.send_buf = pBuffer;
    qspi_message.parent.recv_buf = NULL;
    qspi_message.parent.length = NumByteToWrite;
    qspi_message.parent.next = RT_NULL;
    qspi_message.parent.cs_take = 1;
    qspi_message.parent.cs_release = 1;
    qspi_message.instruction.content = Page_Program_CMD;    //指令
    qspi_message.instruction.qspi_lines = 1;    //指令模式
    qspi_message.address.content = WriteAddr;   //地址
    qspi_message.address.size = 24;  //地址长度
    qspi_message.address.qspi_lines = 1;    //地址模式
    qspi_message.dummy_cycles = 0;  //空指令周期
    qspi_message.qspi_data_lines = 1;   //数据模式
    rt_qspi_transfer_message(qspi_device,&qspi_message);
}
```

请问是哪里出了问题？

踩姑娘的小蘑菇 2024-02-28

这家伙很懒，什么也没写！

dayuyu 2024-02-28

这家伙很懒，什么也没写！

谢谢已经找到原因了！
RT-Thread的drv_qspi.c文件中的qspixfer函数有bug

```c
    /* send data */
    if (sndb)
    {
        rt_kprintf("debug qspi sndb\n");
        qspi_send_cmd(qspi_bus, qspi_message);
//        qspi_bus->QSPI_Handler.Instance->DLR = qspi_message->parent.length - 1;     //2024.2.25添加
        if (qspi_message->parent.length != 0)
        {
            if (HAL_QSPI_Transmit(&qspi_bus->QSPI_Handler, (rt_uint8_t *)sndb, 5000) == HAL_OK)
            {
                result = length;
            }
            else
            {
                LOG_E("QSPI send data failed(%d)!", qspi_bus->QSPI_Handler.ErrorCode);
                qspi_bus->QSPI_Handler.State = HAL_QSPI_STATE_READY;
                result = -RT_ERROR;
                goto __exit;
            }
        }
        else
        {
            result = 1;
        }
    }
    else if (rcvb)/* recv data */
    {
        rt_kprintf("debug qspi rcvb\n");
        qspi_send_cmd(qspi_bus, qspi_message);
#ifdef BSP_QSPI_USING_DMA
        if (HAL_QSPI_Receive_DMA(&qspi_bus->QSPI_Handler, rcvb) == HAL_OK)
#else
        if (HAL_QSPI_Receive(&qspi_bus->QSPI_Handler, rcvb, length) == HAL_OK)
#endif
        {
            result = length;
#ifdef BSP_QSPI_USING_DMA
            while (qspi_bus->QSPI_Handler.RxXferCount != 0);
#endif
        }
        else
        {
            LOG_E("QSPI recv data failed(%d)!", qspi_bus->QSPI_Handler.ErrorCode);
            qspi_bus->QSPI_Handler.State = HAL_QSPI_STATE_READY;
            result = -RT_ERROR;
            goto __exit;
        }
    }
```
它只有这两种情况，当我只需要发送写使能命令，不需要传输数据时，这个if 、else if逻辑就进不去导致出现问题