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; }
i.MX RT1050官方例程 driver_examples\flexspi\nor\polling_transfer
原文：https://www.cnblogs.com/fancyop/p/RT1050_Flexspi_Q1.html