兆易创新GD32F450控制器（3）--- 串口DMA通信

我是采用DMA空闲中断接收不长的数据长度，只设置了DMA串口接收，没有DMA发送设置。

#include "usart.h" #include "gd32f450i_eval.h" #include "dataprocess_app.h" #include "stdio.h" #include "string.h"   /*   * 结构体实例初始化  */ //T_COMOptr COM0 ={ //  .isReFinish          = FALSE, //  .renum               = 0, //  .ComInit             = Usart0_Init, //  .SendByte            = Usart0_Send, //  .SendBuf             = Usart0_Sendbuf, //};  T_COMOptr COM1 ={   .isReFinish          = FALSE,   .renum               = 0,   .ComInit             = Usart1_Init,   .SendByte            = Usart1_Send,   .SendBuf             = Usart1_Sendbuf, };  T_COMOptr COM2 ={   .isReFinish          = FALSE,   .renum               = 0,   .ComInit             = Usart2_Init,   .SendByte            = Usart2_Send,   .SendBuf             = Usart2_Sendbuf, };  T_COMOptr COM3 ={   .isReFinish          = FALSE,   .