GD32E230C USART0串口用PB6 PB7引脚，并使用DMA_CH3和DMA_CH4传输

只看该作者 · 2022-10-30 17:33

因为DMA_CH2已被SPI传输用掉，所以USART0想用DMA_CH4代替，无法接收到数据，一直显示接收的数据大小为0请大家帮忙看看是映射出问题了吗，还是配置没对？

只看该作者 · 2022-10-30 17:36

static int BSP_DmaConfig(dma_channel_enum dma_channelx,uint32_t peripheralAddr,uint32_t memoryAddr,uint32_t dir,uint32_t datasize)
{
dma_parameter_struct dma_init_struct;
rcu_periph_clock_enable(RCU_DMA);
dma_deinit(dma_channelx);
dma_init_struct.direction=dir;
dma_init_struct.memory_addr=memoryAddr;
dma_init_struct.memory_inc=DMA_MEMORY_INCREASE_ENABLE;
dma_init_struct.memory_width=DMA_MEMORY_WIDTH_8BIT;
dma_init_struct.number=datasize;
dma_init_struct.periph_addr=peripheralAddr;
dma_init_struct.periph_inc=DMA_PERIPH_INCREASE_DISABLE;
dma_init_struct.periph_width=DMA_PERIPHERAL_WIDTH_8BIT;
dma_init_struct.priority=DMA_PRIORITY_ULTRA_HIGH;
/* configure DMA mode */
dma_circulation_disable(dma_channelx); //禁止循环模式
dma_memory_to_memory_disable(dma_channelx); //禁止内存到内存
dma_init(dma_channelx,&dma_init_struct);
if(dma_channelx==DMA_CH4)
{
  syscfg_dma_remap_enable(SYSCFG_DMA_REMAP_USART0RX);
}
      if(dma_channelx==DMA_CH3)
{
syscfg_dma_remap_enable(SYSCFG_DMA_REMAP_USART0TX);
}
/* enable DMA channel */
dma_channel_enable(dma_channelx);

return 0;
}
void USART0_IRQHandler(void)
{
      volatile uint32_t clear;
      uint16_t msgLength = 0;

      if(usart_interrupt_flag_get(USART0x, USART_INT_FLAG_IDLE) != RESET){
         usart_interrupt_flag_clear(USART0x,USART_INT_FLAG_IDLE);
         //使用长度=总长度-剩余的长度
         msgLength = sizeof(gUartData.USART0_RxData)-(uint16_t)dma_transfer_number_get(DMA_CH4);
         printf("channel%d %d  %d\r\n",msgLength,sizeof(gUartData.USART0_RxData),dma_transfer_number_get(DMA_CH4));
         //清除中断
         clear=USART_STAT(USART0x);
         clear=USART_RDATA(USART0x);
         dma_channel_disable(DMA_CH4);                                     //关闭DMA传输
         Control_Upper_Computer((uint8_t*)gUartData.USART0_RxData, msgLength-2);
         //由于是单次传输，需要再次初始化
         dma_interrupt_flag_clear(DMA_CH4,DMA_INT_FLAG_FTF);
         dma_interrupt_flag_clear(DMA_CH4,DMA_INT_FLAG_ERR);
         dma_flag_clear(DMA_CH4,DMA_FLAG_FTF);
         dma_flag_clear(DMA_CH4,DMA_FLAG_ERR);
         dma_memory_address_config(DMA_CH4,(uint32_t)gUartData.USART0_RxData);
         dma_transfer_number_config(DMA_CH4,sizeof(gUartData.USART0_RxData)); //数据传输量
         dma_channel_enable(DMA_CH4);                                           //开启DMA传输
      printf("nbb\r\n");
      }
}

GD32E230C USART0串口用PB6 PB7引脚 ，并使用DMA_CH3和DMA_CH4传输