USART1使用串口空闲中断的问题

Nowara

/*
 *@Note
 USART Print debugging routine:
 USART1_Tx(PA9).
 This example demonstrates using USART1(PA9) as a print debug port output.

*/

#include "lcd.h"
#include "debug.h"
#include "string.h"
u8 yuyinBuffer[] = " ";
/* Global typedef */
#define Photo_SIZE 2000 // DMA buffer size
u8 PhotoBuffer[Photo_SIZE]={3};
u8 PhotoBuffer2[Photo_SIZE]={3};
u16 photopoint = 0;
uint16_t PhotoReadPos = 0;       //接收缓冲区读指针
/* Global define */

/* Global Variable */


/*********************************************************************
 * @fn      main
 *
 * @brief   Main program.
 *
 * @return  none
 */
void USART1_IRQHandler(void) __attribute__((interrupt("WCH-Interrupt-fast")));
void USART1_IRQHandler(void)
{
    uint8_t temp;
    if(USART_GetITStatus(USART1, USART_IT_IDLE) != RESET)
    {
        uint16_t rxBufferEnd = Photo_SIZE - DMA_GetCurrDataCounter(DMA1_Channel5); //计算 DMA 数据尾的位置
        uint16_t i = 0;
        lcd_show_num(10, 90, DMA_GetCurrDataCounter(DMA1_Channel5), 3, 16);
        if (PhotoReadPos == rxBufferEnd){
            // 无数据，返回
        }
        else{
//            while (PhotoReadPos!=rxBufferEnd && i < rxBufferEnd - PhotoReadPos){
//            }
            lcd_show_string(50, 160, 32,"cscs");
    //        lcd_show_num(50, 90, PhotoBuffer[1999], 3, 16);
    //        lcd_show_num(30, 90, PhotoBuffer[15], 3, 16);
            lcd_show_num(90, 90, rxBufferEnd - PhotoReadPos, 3, 16);
            lcd_show_num(70, 90, PhotoBuffer[6], 3, 16);
            lcd_show_num(50, 90, PhotoBuffer[5], 3, 16);
        }

        memset(PhotoBuffer, 3, sizeof(PhotoBuffer));
        temp = USART1->STATR;
        temp = USART1->DATAR; //清USART_IT_IDLE标志
    }
    lcd_show_string(50, 120, 32,"cscs444");
}
void UART1_CFG(void)
{
    GPIO_InitTypeDef  GPIO_InitStructure;
    USART_InitTypeDef USART_InitStructure;
    NVIC_InitTypeDef NVIC_Initstrcuture;
    //开启时钟
    RCC_APB1PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
    /* USART6 TX-->C0  RX-->C1 */
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;         //RX，输入上拉
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    USART_InitStructure.USART_BaudRate = 115200;                    // 波特率
    USART_InitStructure.USART_WordLength = USART_WordLength_8b;     // 数据位 8
    USART_InitStructure.USART_StopBits = USART_StopBits_1;          // 停止位 1
    USART_InitStructure.USART_Parity = USART_Parity_No;             // 无校验
    USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None; // 无硬件流控
    USART_InitStructure.USART_Mode = USART_Mode_Rx; //使能 RX 和 TX

    NVIC_Initstrcuture.NVIC_IRQChannel = USART1_IRQn;
    NVIC_Initstrcuture.NVIC_IRQChannelPreemptionPriority=2;
    NVIC_Initstrcuture.NVIC_IRQChannelSubPriority =0;
    NVIC_Initstrcuture.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_Initstrcuture);
    USART_Init(USART1, &USART_InitStructure);
    USART_ITConfig(USART1, USART_IT_IDLE, ENABLE);//开启相关中断
    DMA_Cmd(DMA1_Channel5, ENABLE);
    USART_Cmd(USART1, ENABLE);                                       //开启UART
}
void DMA5_INIT(void)
{
    DMA_InitTypeDef DMA_InitStructure;
    RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);

    // RX DMA 初始化，环形缓冲区自动接收
    DMA_InitStructure.DMA_PeripheralBaseAddr = (u32)(&USART1->DATAR);
    DMA_InitStructure.DMA_MemoryBaseAddr = (u32)PhotoBuffer;                   // 接收缓冲区
    DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;                      // 方向 : 外设 作为 源，即 内存 <- 外设
    DMA_InitStructure.DMA_BufferSize = Photo_SIZE;                          // 缓冲区长度为 RXBUF_SIZE
    DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;                         // 循环模式，构成环形缓冲区
    DMA_Init(DMA1_Channel5, &DMA_InitStructure);
}
int main(void)
{
    NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
    SystemCoreClockUpdate();
    Delay_Init();
    USART_Printf_Init(115200);
    lcd_init();
    lcd_show_string(50, 0, 32,"Yuimerlin");
    DMA5_INIT();
    UART1_CFG();
    USART_DMACmd(USART1,USART_DMAReq_Rx,ENABLE);
    Delay_Ms(2000);
    int mm = 0;
    int num = 0;
    //char buffer[10000]={"\0"};
    lcd_set_color(BLACK,WHITE);
    while(1)
    {
        mm+=1;
        lcd_show_num(50, 60, mm, 3, 16);
        delay_ms(2000);
    }
}

我这个人问题比较多...占据了论坛不少资源，道个歉先...
以下是问题描述：
赤菟的板子，然后我想用usart1的rx接收数据，打算使用串口空闲中断，但是在烧录该代码之后，通过调试工具给usart1输入”123456“,却显示DMA_GetCurrDataCounter(DMA1_Channel5)为0，也就是没有数据，这是为什么呀

Benue

Nowara DMA数据计数器是减计数的，DMA_GetCurrDataCounter为0应该是满了才对。
但你配置的是DMA_Mode_Circular循环传输模式，即使到0也会继续循环减计数，不应该一直为0。
这样的现象很奇怪。
建议：

去掉 USART_Printf_Init(115200); 或改DEBUG串口为 UART2; 禁用 USART1 中断。
仿照DMA例程做一个接收函数调试接收功能。
把printf 和中断一点点加回来调试

Nowara

请问这样接跳线帽和改debug头文件没问题吧
重新弄了一下，现在是输入数据，DMA_GetCurrDataCounter(DMA1_Channel5)始终为2000，按Benue哥所说，DMA并没有接收到数据？DMA应该是启动了呀...

Benue

Nowara 试试 把 DMA_DeInit(DMA1_Channel5); 加到 RX DMA 初始化前面。
去掉所有 USART1 中断的代码，就是做成类似DMA例程的样子测试下

Nowara

Benue

/********************************** (C) COPYRIGHT *******************************
* File Name          : main.c
* Author             : WCH
* Version            : V1.0.0
* Date               : 2021/06/06
* Description        : Main program body.
*********************************************************************************
* Copyright (c) 2021 Nanjing Qinheng Microelectronics Co., Ltd.
* Attention: This software (modified or not) and binary are used for 
* microcontroller manufactured by Nanjing Qinheng Microelectronics.
*******************************************************************************/

/*
 *@Note
 USART Print debugging routine:
 USART1_Tx(PA9).
 This example demonstrates using USART1(PA9) as a print debug port output.

*/

#include "lcd.h"
#include "debug.h"
#include "string.h"
/* Global typedef */
#define Photo_SIZE 5000 // DMA buffer size
u8 PhotoBuffer[Photo_SIZE]={0};
/* Global define */

/* Global Variable */


/*********************************************************************
 * @fn      main
 *
 * @brief   Main program.
 *
 * @return  none
 */
void UART3_CFG(void)
{
    GPIO_InitTypeDef  GPIO_InitStructure;
    USART_InitTypeDef USART_InitStructure;
//    NVIC_InitTypeDef NVIC_Initstrcuture;
    //开启时钟
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOD, ENABLE);
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3, ENABLE);
    GPIO_PinRemapConfig(GPIO_FullRemap_USART3, ENABLE);
    /* USART6 TX-->C0  RX-->C1 */
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;         //RX，输入上拉
    GPIO_Init(GPIOD, &GPIO_InitStructure);

    USART_InitStructure.USART_BaudRate = 115200;                    // 波特率
    USART_InitStructure.USART_WordLength = USART_WordLength_8b;     // 数据位 8
    USART_InitStructure.USART_StopBits = USART_StopBits_1;          // 停止位 1
    USART_InitStructure.USART_Parity = USART_Parity_No;             // 无校验
    USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None; // 无硬件流控
    USART_InitStructure.USART_Mode = USART_Mode_Rx; //使能 RX 和 TX

//    NVIC_Initstrcuture.NVIC_IRQChannel = USART1_IRQn;
//    NVIC_Initstrcuture.NVIC_IRQChannelPreemptionPriority=1;
//    NVIC_Initstrcuture.NVIC_IRQChannelSubPriority =0;
//    NVIC_Initstrcuture.NVIC_IRQChannelCmd = ENABLE;
//    NVIC_Init(&NVIC_Initstrcuture);
    USART_Init(USART3, &USART_InitStructure);
//    USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);//开启相关中断
    DMA_Cmd(DMA1_Channel3, ENABLE);
    USART_Cmd(USART3, ENABLE);                                       //开启UART
}
void DMA3_INIT(void)
{
    DMA_InitTypeDef DMA_InitStructure;
    RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);
    DMA_DeInit(DMA1_Channel3);
    // RX DMA 初始化，环形缓冲区自动接收
    DMA_InitStructure.DMA_PeripheralBaseAddr = (u32)(&USART3->DATAR);
    DMA_InitStructure.DMA_MemoryBaseAddr = (u32)PhotoBuffer;                   // 接收缓冲区
    DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;                      // 方向 : 外设 作为 源，即 内存 <- 外设
    DMA_InitStructure.DMA_BufferSize = Photo_SIZE;                          // 缓冲区长度为 RXBUF_SIZE
    DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;                         // 循环模式，构成环形缓冲区
    DMA_Init(DMA1_Channel3, &DMA_InitStructure);
}
uint16_t PhotoReadPos = 0;       //接收缓冲区读指针
uint32_t uartReadPhoto(u32 * buffer , uint16_t num)
{
    uint16_t rxBufferEnd = Photo_SIZE - DMA_GetCurrDataCounter(DMA1_Channel3); //计算 DMA 数据尾的位置
    uint16_t i = 0;
    if (PhotoReadPos == rxBufferEnd){
        // 无数据，返回
        return 0;
    }
    while (PhotoReadPos!=rxBufferEnd && i < num){
        buffer[i] = PhotoBuffer[PhotoReadPos];
        if (PhotoBuffer[i]!=0){
            lcd_show_num(i+i*10, 150, PhotoBuffer[i], 3, 16);
        }
        lcd_show_string(0, 120, 24,"cscs255");
        i++;
        PhotoReadPos++;
        if(PhotoReadPos >= Photo_SIZE){
            // 超出缓冲区，回零
            PhotoReadPos = 0;
        }
    }
    return i;
}
/*******************************************************************************
* Function Name  :  uartAvailableWiFi
* Description    :  get number of bytes Available to read from the UART buffer  获取缓冲区中可读数据的数量
* Input          :  None
* Return         :  uint16_t    number of bytes Available to read               返回可读数据数量
*******************************************************************************/
uint16_t uartAvailablePhoto()
{
    uint16_t rxBufferEnd = Photo_SIZE - DMA_GetCurrDataCounter(DMA1_Channel3);//计算 DMA 数据尾的位置
    // 计算可读字节
    lcd_show_num(0, 170, DMA_GetCurrDataCounter(DMA1_Channel3), 3, 16);
    if (PhotoReadPos <= rxBufferEnd){
        return rxBufferEnd - PhotoReadPos;
    }else{
        return rxBufferEnd + Photo_SIZE - PhotoReadPos;
    }
}

int main(void)
{
    NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
    SystemCoreClockUpdate();
    Delay_Init();
    USART_Printf_Init(115200);
    lcd_init();
    DMA3_INIT();
    UART3_CFG();
    USART_DMACmd(USART3,USART_DMAReq_Rx,ENABLE);
    Delay_Ms(2000);
    int mm = 0;
    int num = 0;
    u32 buffer[5000]={0};
    lcd_set_color(BLACK,WHITE);
    while(1)
    {
        num = uartAvailablePhoto();
        uartReadPhoto(buffer , num);
        mm+=1;
//        uartWriteYuyinStr(yuyin);
        lcd_show_num(0, 40, num, 3, 16);
        lcd_show_num(50, 0, mm, 3, 16);
        delay_ms(2000);
    }
}

uart1整不明白了，打算换成usart3端口，代码如上，发送数据后，PhotoBuffer均为0，这是什么原因呢