[求助] STM32串口清中断后下次再接收数据会不会再次进入中断我调试的是必须复位

少蚊好 2011-7-8 20:13 楼主

STM32串口清中断后下次再接收数据会不会再次进入中断我调试的是不能必须复位才能接收新的数据请问大家有知道怎么回事吗？

代码如下：

/* Includes ------------------------------------------------------------------*/
#include "stm32f10x.h"
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
USART_InitTypeDef USART_InitStructure;
USART_ClockInitTypeDef USART_ClockInitStructure;
ErrorStatus HSEStartUpStatus;
/* Private function prototypes -----------------------------------------------*/
void RCC_Configuration(void);
void GPIO_Configuration(void);
void NVIC_Configuration(void);

/* Private functions ---------------------------------------------------------*/

/*******************************************************************************
* Function Name : main
* Description    : Main program
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
int main(void)
{
#ifdef DEBUG
debug();
#endif

/* System Clocks Configuration */
RCC_Configuration();

/* NVIC configuration */
NVIC_Configuration();

/* Configure the GPIO ports */
GPIO_Configuration();

/* USART1 configured as follow:
        - BaudRate = 9600 baud
        - Word Length = 8 Bits
        - Two Stop Bit
        - Odd parity
        - Hardware flow control disabled (RTS and CTS signals)
        - Receive and transmit enabled
        - USART Clock disabled
        - USART CPOL: Clock is active low
        - USART CPHA: Data is captured on the second edge
        - USART LastBit: The clock pulse of the last data bit is not output to
                         the SCLK pin
*/
GPIO_PinRemapConfig(GPIO_Remap_USART1,ENABLE);
/*AFIO->MAPR|=(uint32_t)0x04;*/   // clear USART1 remap

USART_InitStructure.USART_BaudRate = 9600;
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_ClockInitStructure.USART_Clock = USART_Clock_Disable; //禁用USART时钟时钟低电平活动
USART_ClockInitStructure.USART_CPOL = USART_CPOL_Low; //时钟极性，数据低电平有效
USART_ClockInitStructure.USART_CPHA = USART_CPHA_2Edge; //外部时钟相位，数据在第二个时钟捕捉
USART_ClockInitStructure.USART_LastBit = USART_LastBit_Disable; //禁用最后一位，最后数据位的时钟脉冲不输出到SCLK引脚

/* Configure the USART1 */
USART_Init(USART1, &USART_InitStructure);

USART_ClockInit(USART1,&USART_ClockInitStructure);
/* Enable the USART Transmoit interrupt: this interrupt is generated when the
USART1 transmit data register is empty */
USART_ITConfig(USART1, USART_IT_TXE, ENABLE);

/* Enable the USART Receive interrupt: this interrupt is generated when the
USART1 receive data register is not empty */
USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);

/* Enable USART1 */
USART_Cmd(USART1, ENABLE);

while(1)
{
}
}

/*******************************************************************************
* Function Name : RCC_Configuration
* Description    : Configures the different system clocks.
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
void RCC_Configuration(void)
{
/* RCC system reset(for debug purpose)将RCC寄存器从新设置为默认值 */
RCC_DeInit();

/* Enable HSE 打开外部高速时钟晶振*/
RCC_HSEConfig(RCC_HSE_ON);

/* Wait till HSE is ready 等待外部高速时钟晶振工作*/
HSEStartUpStatus = RCC_WaitForHSEStartUp();

if(HSEStartUpStatus == SUCCESS)
{
    /* HCLK = SYSCLK 设置AHB时钟设置高速总线时钟=系统时钟*/
    RCC_HCLKConfig(RCC_SYSCLK_Div1);

    /* PCLK2 = HCLK 设置高速AHB时钟设置低速总线2时钟=高速总线时钟*/
    RCC_PCLK2Config(RCC_HCLK_Div1);

/* PCLK1 = HCLK/2 设置低速AHB时钟设置低速总线1时钟=高速时钟的二分频*/
RCC_PCLK1Config(RCC_HCLK_Div2);

    /* Flash 2 wait state 令Flash处于等待状态，2是针对高频时钟的*/
    FLASH_SetLatency(FLASH_Latency_2);
    /* Enable Prefetch Buffer 使能flash预读取缓冲区*/
    FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable);

/* PLLCLK = 8MHz * 9 = 72 MHz 利用锁相环将外部8MHz晶振9倍频到72MHz */
RCC_PLLConfig(RCC_PLLSource_HSE_Div1, RCC_PLLMul_9);

/* Enable PLL 使能锁相环 */
RCC_PLLCmd(ENABLE);

    /* Wait till PLL is ready 等待锁相环输出稳定*/
    while(RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET)
    {
    }

/* Select PLL as system clock source 将锁相环输出设置为系统时钟*/
RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK);

    /* Wait till PLL is used as system clock source 判断PLL是否是系统时钟*/
    while(RCC_GetSYSCLKSource() != 0x08)
    {
    }
}

/* Enable GPIOA and USART1 clocks 使能外围接口总线时钟，开串口时钟*/
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB | RCC_APB2Periph_USART1| RCC_APB2Periph_AFIO, ENABLE);

}

/*******************************************************************************
* Function Name : GPIO_Configuration
* Description    : Configures the different GPIO ports.
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
void GPIO_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStructure;

/* Configure USART1 Tx (PB6) as alternate function push-pull */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(GPIOB, &GPIO_InitStructure);

/* Configure USART1 Rx (PB7) as input floating */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOB, &GPIO_InitStructure);

}

/*******************************************************************************
* Function Name : NVIC_Configuration
* Description    : Configures the nested vectored interrupt controller.
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
void NVIC_Configuration(void)
{
NVIC_InitTypeDef NVIC_InitStructure;

#ifdef VECT_TAB_RAM
/* Set the Vector Table base location at 0x20000000 */
NVIC_SetVectorTable(NVIC_VectTab_RAM, 0x0);
#else /* VECT_TAB_FLASH */
/* Set the Vector Table base location at 0x08000000 */
NVIC_SetVectorTable(NVIC_VectTab_FLASH, 0x0);
#endif

/* Enable the USART1 Interrupt */
NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}

中断处理函数是：void USART1_IRQHandler(void)
{
if(USART_GetITStatus(USART1, USART_IT_RXNE) == SET)
{
    /* Read one byte from the receive data register */
RxBuffer[RxCounter++] = (USART_ReceiveData(USART1) & 0x7F);

    /* Clear the USART1 Receive interrupt */
    USART_ClearITPendingBit(USART1, USART_IT_RXNE);

    if(RxCounter == NbrOfDataToRead)
    {
      /* Disable the USART Receive interrupt */
      USART_ITConfig(USART1, USART_IT_RXNE, DISABLE);
   USART_ITConfig(USART1, USART_IT_TXE, ENABLE);
   TxCounter=0;
   p = RxBuffer;
    }
}

if(USART_GetITStatus(USART1, USART_IT_TXE) == SET)
{
    /* Write one byte to the transmit data register */
    USART_SendData(USART1, p[TxCounter++]);
while(USART_GetFlagStatus(USART1, USART_IT_TXE)==RESET)

/* Clear the USART1 transmit interrupt */
USART_ClearITPendingBit(USART1, USART_IT_TC);

    if(p==TxBuffer&&TxCounter == NbrOfDataToTransfer)
    {
      /* Disable the USART1 Transmit interrupt */
      USART_ITConfig(USART1, USART_IT_TXE, DISABLE);
    }
if(p==RxBuffer&&TxCounter==RxCounter)
{
      /* Disable the USART1 Transmit interrupt */
      USART_ITConfig(USART1, USART_IT_TXE, DISABLE);
}
}
    if(USART_GetFlagStatus(USART1,USART_FLAG_ORE)==SET)
    {
        USART_ClearFlag(USART1,USART_FLAG_ORE);    //清溢出位
        USART_ReceiveData(USART1);                //读DR
    }
}

已经清楚中断标志位了，为什么发送新的数据时不能覆盖掉以前的数据？

回复评论（5）

沙发新鲜老国

关键时刻，必须淡定和坚持

点赞 2011-7-8 20:23

板凳新鲜老国

你不应该在中断里面把中断关掉，我觉得应改成：

void USART1_IRQHandler(void)
{
if(USART_GetITStatus(USART1, USART_IT_RXNE) == SET)
{
/* Read one byte from the receive data register */
RxBuffer[RxCounter++] = (USART_ReceiveData(USART1) & 0x7F);

/* Clear the USART1 Receive interrupt */
USART_ClearITPendingBit(USART1, USART_IT_RXNE);

if(RxCounter == NbrOfDataToRead)
{
/* Disable the USART Receive interrupt */
TxCounter=0;
p = RxBuffer;
}
}

if(USART_GetITStatus(USART1, USART_IT_TXE) == SET)
{
/* Write one byte to the transmit data register */
USART_SendData(USART1, p[TxCounter++]);
while(USART_GetFlagStatus(USART1, USART_IT_TXE)==RESET)

/* Clear the USART1 transmit interrupt */
USART_ClearITPendingBit(USART1, USART_IT_TC);

if(p==TxBuffer&&TxCounter == NbrOfDataToTransfer)
{
/* Disable the USART1 Transmit interrupt */
}
if(p==RxBuffer&&TxCounter==RxCounter)
{
/* Disable the USART1 Transmit interrupt */
}
}
if(USART_GetFlagStatus(USART1,USART_FLAG_ORE)==SET)
{
USART_ClearFlag(USART1,USART_FLAG_ORE); //清溢出位
USART_ReceiveData(USART1); //读DR
}
}