stm32 DMA usart3 空闲中断

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野火mini  usart3 使用DMA 接收发送 接收数据不能接收到数据

/**
  ******************************************************************************
  * @file    main.c
  * @author  fire
  * @version V1.0
  * @date    2013-xx-xx
  * @brief   串口中断接收测试
  ******************************************************************************
  * @attention
  *
  * 实验平台:野火 iSO-MINI STM32 开发板
  * 论坛    :http://www.chuxue123.com
  * 淘宝    :http://firestm32.taobao.com
  *
  ******************************************************************************
  */


#include "stm32f10x.h"
#include "bsp_usart1.h"

#define RS485_RE_Tx GPIO_SetBits(GPIOE, GPIO_Pin_15)
#define RS485_RE_Rx GPIO_ResetBits(GPIOE, GPIO_Pin_15)

/**
  * @brief  主函数
  * @param  无
  * @retval 无
  */
int main(void)
{
        GPIO_InitTypeDef GPIO_InitStructure;
                /* USART1 配置模式为 115200 8-N-1，中断接收 */
        USART1_Config();
        USART3_DMA_Config();
                //PE15 RE
        GPIO_InitStructure.GPIO_Pin =  GPIO_Pin_15;
        GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;//推挽输出
        GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
        GPIO_Init(GPIOE, &GPIO_InitStructure);
        NVIC_Configuration();

        RS485_RE_Tx;
        printf("\r\n 这是一个串口中断接收回显实验 \r\n");       
        printf("\r\n 请在超级终端或者串口调试助手输入字符 \r\n");       
        RS485_RE_Rx;
        for(;;)
        {
               
        }
}
/*********************************************END OF FILE**********************/

/**
  ******************************************************************************
  * @file    bsp_usart1.c
  * @author  fire
  * @version V1.0
  * @date    2013-xx-xx
  * @brief   usart应用bsp
  ******************************************************************************
  * @attention
  *
  * 实验平台:野火 iSO-MINI STM32 开发板
  * 论坛    :http://www.chuxue123.com
  * 淘宝    :http://firestm32.taobao.com
  *
  ******************************************************************************
  */
  
#include "bsp_usart1.h"

/**
  * @brief  USART1 GPIO 配置,工作模式配置。9600 8-N-1
  * @param  无
  * @retval 无
  */
void USART1_Config(void)
{
        GPIO_InitTypeDef GPIO_InitStructure;
        USART_InitTypeDef USART_InitStructure;
       
        /* config USART1 clock */
        RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOB, ENABLE);
        RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3 , ENABLE);
        /* USART1 GPIO config */
        /* Configure USART1 Tx (PA.09) as alternate function push-pull */
        GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
        GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
        GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
        GPIO_Init(GPIOB, &GPIO_InitStructure);   
        /* Configure USART1 Rx (PA.10) as input floating */
        GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11;
        GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
        GPIO_Init(GPIOB, &GPIO_InitStructure);
       
        /* USART1 mode config */
        USART_InitStructure.USART_BaudRate = 115200;
        USART_InitStructure.USART_WordLength = USART_WordLength_8b;
        USART_InitStructure.USART_StopBits = USART_StopBits_1;
        USART_InitStructure.USART_Parity = USART_Parity_No ;
        USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
        USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
        USART_Init(USART3, &USART_InitStructure);
       
        /* 使能串口1接收中断 */
        USART_ITConfig(USART3, USART_IT_IDLE, ENABLE);
       
        USART_Cmd(USART3, ENABLE);
}

#define USART3_DR_Base 0x40004804

u8 USART3_DMA_SendBuff[USART3_DMA_SendBuffSize];        //串口3 DMA发送数据内存地址
u8 USART3_DMA_ReceiveBuff[USART3_DMA_ReceiveBuffSize];  //串口3 DMA接收数据内存地址

/**
  * @brief  USART3 TX DMA 配置，内存到外设(USART1->DR)
  * @param  无
  * @retval 无
  */
void USART3_DMA_Config(void)
{
        DMA_InitTypeDef DMA_InitStructure;
        //RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);                                        /*开启DMA时钟*/
        DMA_InitStructure.DMA_PeripheralBaseAddr = USART3_DR_Base;                                 /*设置DMA源：串口数据寄存器地址*/  
        DMA_InitStructure.DMA_MemoryBaseAddr = (u32)USART3_DMA_SendBuff;                /*内存地址(要传输的变量的指针)*/
        DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;                                                /*方向：从内存到外设*/                               
        DMA_InitStructure.DMA_BufferSize = USART3_DMA_SendBuffSize;                                /*传输大小DMA_BufferSize=SENDBUFF_SIZE*/                       
        DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;                 /*外设地址不增*/
        DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;                                        /*内存地址自增*/
        DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;        /*外设数据单位*/       
        DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;                         /*内存数据单位 8bit*/
        DMA_InitStructure.DMA_Mode = DMA_Mode_Normal ;                                                        /*DMA模式：单次循环*/
        //DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;                                                 /*DMA模式：不断循环*/
        DMA_InitStructure.DMA_Priority = DMA_Priority_Medium;                                          /*优先级：中*/       
        DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;                                                        /*禁止内存到内存的传输        */                          
        DMA_Init(DMA1_Channel2, &DMA_InitStructure);                                                           /*配置DMA1的2通道*/
        DMA_Cmd (DMA1_Channel2,ENABLE);                                                                                        /*使能DMA*/                       
        DMA_ITConfig(DMA1_Channel2,DMA_IT_TC,ENABLE);                                                          //配置DMA发送完成后产生中断
        DMA_ClearFlag(DMA1_FLAG_TC2);         // 清除标志
       
        DMA_DeInit(DMA1_Channel3);
        DMA_InitStructure.DMA_PeripheralBaseAddr = USART3_DR_Base;
        DMA_InitStructure.DMA_MemoryBaseAddr = (u32)USART3_DMA_ReceiveBuff;                /*内存地址(要传输的变量的指针)*/
        DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;                                                /*方向：从外设到内存*/                               
        DMA_InitStructure.DMA_BufferSize = USART3_DMA_ReceiveBuffSize;                        /*传输大小DMA_BufferSize=SENDBUFF_SIZE*/                       
        DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;                 /*外设地址不增*/
        DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;                                        /*内存地址自增*/
        DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;        /*外设数据单位*/       
        DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;                         /*内存数据单位 8bit*/
        DMA_InitStructure.DMA_Mode = DMA_Mode_Normal ;
        //DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;                                                 /*DMA模式：不断循环*/
        DMA_InitStructure.DMA_Priority = DMA_Priority_VeryHigh;                                  /*优先级：中*/       
        DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;                                                        /*禁止内存到内存的传输        */                          
        DMA_Init(DMA1_Channel3, &DMA_InitStructure);                                                           /*配置DMA1的3通道*/
        DMA_ClearFlag(DMA1_FLAG_GL3);
        DMA_Cmd (DMA1_Channel3,ENABLE);                                                                                        /*使能DMA*/               
}


/// 配置USART1接收中断
void NVIC_Configuration(void)
{
        NVIC_InitTypeDef NVIC_InitStructure;
        /* Configure the NVIC Preemption Priority Bits */  
        NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);
       
        /* Enable the USARTy Interrupt */
        NVIC_InitStructure.NVIC_IRQChannel = USART3_IRQn;         
        NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
        NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
        NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
        NVIC_Init(&NVIC_InitStructure);
}


/// 重定向c库函数printf到USART1
int fputc(int ch, FILE *f)
{
                /* 发送一个字节数据到USART1 */
                USART_SendData(USART3, (uint8_t) ch);
               
                /* 等待发送完毕 */
                while (USART_GetFlagStatus(USART3, USART_FLAG_TC) == RESET);               
       
                return (ch);
}
/*********************************************END OF FILE**********************/


#ifndef __USART1_H
#define        __USART1_H

#include "stm32f10x.h"
#include <stdio.h>

#define USART3_DMA_SendBuffSize 256
#define USART3_DMA_ReceiveBuffSize 512

void USART1_Config(void);
void NVIC_Configuration(void);
void USART3_DMA_Config(void);
int fputc(int ch, FILE *f);
int fgetc(FILE *f);

#endif /* __USART1_H */
/**
  ******************************************************************************
  * @file    Project/STM32F10x_StdPeriph_Template/stm32f10x_it.c
  * @author  MCD Application Team
  * @version V3.5.0
  * @date    08-April-2011
  * @brief   Main Interrupt Service Routines.
  *          This file provides template for all exceptions handler and
  *          peripherals interrupt service routine.
  ******************************************************************************
  * @attention
  *
  * THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS
  * WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE
  * TIME. AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY
  * DIRECT, INDIRECT OR CONSEQUENTI
  
  AL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING
  * FROM THE CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE
  * CODING INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
  *
  * <h2><center>&copy; COPYRIGHT 2011 STMicroelectronics</center></h2>
  ******************************************************************************
  */

/* Includes ------------------------------------------------------------------*/
#include "stm32f10x_it.h"
#include <stdio.h>

/** @addtogroup STM32F10x_StdPeriph_Template
  * @{
  */

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* Private function prototypes -----------------------------------------------*/
/* Private functions ---------------------------------------------------------*/

/******************************************************************************/
/*            Cortex-M3 Processor Exceptions Handlers                         */
/******************************************************************************/

/**
  * @brief  This function handles NMI exception.
  * @param  None
  * @retval None
  */
void NMI_Handler(void)
{
}

/**
  * @brief  This function handles Hard Fault exception.
  * @param  None
  * @retval None
  */
void HardFault_Handler(void)
{
  /* Go to infinite loop when Hard Fault exception occurs */
  while (1)
  {
  }
}

/**
  * @brief  This function handles Memory Manage exception.
  * @param  None
  * @retval None
  */
void MemManage_Handler(void)
{
  /* Go to infinite loop when Memory Manage exception occurs */
  while (1)
  {
  }
}

/**
  * @brief  This function handles Bus Fault exception.
  * @param  None
  * @retval None
  */
void BusFault_Handler(void)
{
  /* Go to infinite loop when Bus Fault exception occurs */
  while (1)
  {
  }
}

/**
  * @brief  This function handles Usage Fault exception.
  * @param  None
  * @retval None
  */
void UsageFault_Handler(void)
{
  /* Go to infinite loop when Usage Fault exception occurs */
  while (1)
  {
  }
}

/**
  * @brief  This function handles SVCall exception.
  * @param  None
  * @retval None
  */
void SVC_Handler(void)
{
}

/**
  * @brief  This function handles Debug Monitor exception.
  * @param  None
  * @retval None
  */
void DebugMon_Handler(void)
{
}

/**
  * @brief  This function handles PendSVC exception.
  * @param  None
  * @retval None
  */
void PendSV_Handler(void)
{
}

/**
  * @brief  This function handles SysTick Handler.
  * @param  None
  * @retval None
  */
void SysTick_Handler(void)
{
}

/******************************************************************************/
/*                 STM32F10x Peripherals Interrupt Handlers                   */
/*  Add here the Interrupt Handler for the used peripheral(s) (PPP), for the  */
/*  available peripheral interrupt handler's name please refer to the startup */
/*  file (startup_stm32f10x_xx.s).                                            */
/******************************************************************************/
void USART3_IRQHandler(void)
{
        uint8_t ch;
       
        if(USART_GetITStatus(USART3, USART_IT_IDLE) != RESET)
        {        
            //ch = USART1->DR;
                USART_GetFlagStatus(USART3,USART_SR_IDLE);
                ch = USART_ReceiveData(USART3);
                USART_ClearITPendingBit(USART3, USART_IT_IDLE);
                  printf( "%c", ch );    //将接受到的数据直接返回打印
        }
}
/**
  * @brief  This function handles PPP interrupt request.
  * @param  None
  * @retval None
  */
/*void PPP_IRQHandler(void)
{
}*/

/**
  * @}
  */


/******************* (C) COPYRIGHT 2011 STMicroelectronics *****END OF FILE****/

啦啦啦啦啦12345

参考一下例程吧

雨中飞烁

yhpzy 发表于 2020-7-23 08:46
参考一下例程吧

没有DMA 的接收例程