QSPI DMA UART

示例工程流程图如图 38所示：

1. 配置QSPI DMA UART。

   g_qspi_handle.init.clock_prescaler = SystemCoreClock / 1000000;
   g_qspi_handle.init.clock_mode = QSPI_CLOCK_MODE_3;
   g_qspi_handle.init.rx_sample_delay = 0;
   
   hal_qspi_deinit(&g_qspi_handle);
   if (HAL_OK != hal_qspi_init(&g_qspi_handle))
   {
       printf("\r\nFlash initial failed.\r\n");
       return 0;
   }
   
   uart_handle.p_instance         = UART1;
   uart_handle.init.baud_rate     = 115200;
   uart_handle.init.data_bits     = UART_DATABITS_8;
   uart_handle.init.stop_bits     = UART_STOPBITS_1;
   uart_handle.init.parity        = UART_PARITY_NONE;
   uart_handle.init.hw_flow_ctrl  = UART_HWCONTROL_NONE;
   uart_handle.init.rx_timeout_mode = UART_RECEIVER_TIMEOUT_DISABLE;
   hal_uart_deinit(&uart_handle);
   hal_uart_init(&uart_handle);

   1. 配置QSPI模块。

      配置QSPI的时钟为1 MHz，配置空闲状态时的时钟信号为高电平。

   2. 配置UART模块。

      UART详细配置信息请参考UART DMA。其中UART配置为UART1。

2. 调用hal_qspi_init()初始化QSPI模块。代码如下：

   hal_qspi_init(&g_qspi_handle)

3. 调用SPI_FLASH_Read_Device_ID()获取Flash的设备ID。代码如下：

   device_id = SPI_FLASH_Read_Device_ID();
   printf("Read_Device_ID = 0x%06X\r\n", device_id);
   

4. 调用SPI_FLASH_Read()读取Flash中的数据。代码如下：

   SPI_FLASH_Read(FLASH_PROGRAM_START_ADDR, flash_buffer, FLASH_PAGE_SIZE);
   for (i = 0; i < FLASH_PAGE_SIZE; i++) {
       if (flash_buffer[i] != 0xFF)
           break;
   }
   
   if (i < FLASH_PAGE_SIZE)
   {
       printf("Erase Sector...\r\n");
       SPI_FLASH_Sector_Erase(FLASH_PROGRAM_START_ADDR);
       printf("Erase Sector Success.\r\n");
   }
   

5. 调用SPI_FLASH_Page_Program()向Flash写数据。代码如下：

   printf("Page_Program...\r\n");
   SPI_FLASH_Page_Program(FLASH_PROGRAM_START_ADDR, flash_buffer);
   printf("Page Program Success.\r\n");
   

6. 配置QSPI模式为QSPI模式，配置数据位宽为32位，传输目的为EEPROM，输出大小为(FLASH_PAGE_SIZE >> 2) - 1。代码如下：

   /* Config QSPI in SPI mode, data size is 32bits */
   __HAL_QSPI_DISABLE(p_qspi_handle);
   ll_spi_set_frame_format(p_qspi_handle->p_instance, LL_SSI_FRF_SPI);
   ll_spi_set_data_size(p_qspi_handle->p_instance, LL_SSI_DATASIZE_8BIT);
   ll_spi_set_transfer_direction(p_qspi_handle->p_instance, LL_SSI_READ_EEPROM);
   ll_spi_set_receive_size(p_qspi_handle->p_instance, FLASH_PAGE_SIZE - 1);
   __HAL_QSPI_ENABLE(p_qspi_handle);
   

7. 配置UART1 FIFO threshold 和burst length。代码如下：

   /* Config FIFO threshold of UART and burst length of DMA */
   ll_uart_set_tx_fifo_threshold(uart_handle.p_instance, LL_UART_TX_FIFO_TH_QUARTER_FULL);
   ll_uart_enable_it(uart_handle.p_instance, UART_IT_THRE);
   
   ll_dma_set_source_burst_length(DMA, p_qspi_handle->p_dma->channel, 
                                  LL_DMA_SRC_BURST_LENGTH_1);
   ll_dma_set_destination_burst_length(DMA, p_qspi_handle->p_dma->channel, 
                                       LL_DMA_DST_BURST_LENGTH_8);
   

8. 开始DMA传输并等待传输完成。代码如下：

   uint32_t cmd_addr = ((uint32_t)SPI_FLASH_CMD_READ << 24) | FLASH_PROGRAM_START_ADDR;
   hal_dma_start(p_qspi_handle->p_dma, (uint32_t)& p_qspi_handle->p_instance->DATA, 
                (uint32_t)&UART1->RBR_DLL_THR, FLASH_PAGE_SIZE);
   p_qspi_handle->p_instance->DATA = (cmd_addr >> 24 ) & 0xff;
   p_qspi_handle->p_instance->DATA = (cmd_addr >> 16 ) & 0xff;
   p_qspi_handle->p_instance->DATA = (cmd_addr >>  8 ) & 0xff;
   p_qspi_handle->p_instance->DATA = (cmd_addr >>  0 ) & 0xff;
   
   __HAL_QSPI_ENABLE_DMARX(p_qspi_handle);
   ll_spi_enable_ss(p_qspi_handle->p_instance, LL_SSI_SLAVE0);
   hal_status_t status = hal_dma_poll_for_transfer(p_qspi_handle->p_dma, 1000);
   if (status == HAL_OK)
   {
       printf("Transfer finished.\r\n");
   }
   else
   {
       printf("Transfer failed, hal_status = %d\r\n", status);
   }
   

1. 用GProgrammer下载qspi_flash_dma_uart.bin至开发板。
2. 将开发板串口连接至PC端，打开并配置GRUart。
3. 在GRUart的Receive Data窗口中将会显示QSPI FLASH UART的交互数据信息。