i.MX RT1050官方例程 driver_examplesflexspi orpolling_transfer

RT1050单片机官方SDK（2.5.1和2.5.0这部分都一样）例程中利用flexspi对外部norflash进行擦写，发现扇区擦写函数flexspi_nor_flash_erase_sector存在扇区擦写不能成功的问题，最后分析发现，这个函数擦写之前没有进行spi写使能，代码修改前后对比如下：

问题扇区擦写代码：

status_t flexspi_nor_flash_erase_sector(FLEXSPI_Type *base, uint32_t address)
{
    status_t status;
    flexspi_transfer_t flashXfer;

    /* Write enable */
    flashXfer.deviceAddress = address;
    flashXfer.port = kFLEXSPI_PortA1;
    flashXfer.cmdType = kFLEXSPI_Command;
    flashXfer.SeqNumber = 1;
    flashXfer.seqIndex = NOR_CMD_LUT_SEQ_IDX_WRITEENABLE;

    status = FLEXSPI_TransferBlocking(base, &flashXfer);

    if (status != kStatus_Success)
    {
        return status;
    }

    flashXfer.deviceAddress = address;
    flashXfer.port = kFLEXSPI_PortA1;
    flashXfer.cmdType = kFLEXSPI_Command;
    flashXfer.SeqNumber = 1;
    flashXfer.seqIndex = NOR_CMD_LUT_SEQ_IDX_ERASESECTOR;
    status = FLEXSPI_TransferBlocking(base, &flashXfer);

    if (status != kStatus_Success)
    {
        return status;
    }

    status = flexspi_nor_wait_bus_busy(base);

    return status;
}

有意思的时函数里面注释的有写使能，但是没有这部分代码，绝对是这位老哥给忘了。

修改后的代码（高亮背景的是添加的代码）：

status_t flexspi_nor_flash_erase_sector(FLEXSPI_Type *base, uint32_t address)
{
    status_t status;
    flexspi_transfer_t flashXfer;

    /* Write enable */
    status = flexspi_nor_write_enable(base, address);

    if (status != kStatus_Success)
    {
        return status;
    }
    
    flashXfer.deviceAddress = address;
    flashXfer.port = kFLEXSPI_PortA1;
    flashXfer.cmdType = kFLEXSPI_Command;
    flashXfer.SeqNumber = 1;
    flashXfer.seqIndex = NOR_CMD_LUT_SEQ_IDX_WRITEENABLE;

    status = FLEXSPI_TransferBlocking(base, &flashXfer);

    if (status != kStatus_Success)
    {
        return status;
    }

    flashXfer.deviceAddress = address;
    flashXfer.port = kFLEXSPI_PortA1;
    flashXfer.cmdType = kFLEXSPI_Command;
    flashXfer.SeqNumber = 1;
    flashXfer.seqIndex = NOR_CMD_LUT_SEQ_IDX_ERASESECTOR;
    status = FLEXSPI_TransferBlocking(base, &flashXfer);

    if (status != kStatus_Success)
    {
        return status;
    }

    status = flexspi_nor_wait_bus_busy(base);

    return status;
}