求助:STM32的USART1不能接收接收数据

只看该作者 · 2014-12-3 00:40

代码如下:
#include "stm32f10x_lib.h"

//*************************************//
void RCC_Configuration(void);
void GPIO_Configuration(void);
void USART_Configuration(void);
//**************************************//
void delay(u32 k)
{
while(k--);
}
//**********主函数************//
int main(void)
{
RCC_Configuration();
GPIO_Configuration();
USART_Configuration();

while(1);
}

//***********RCC寄存器级配置******************//
void RCC_Configuration(void)
{
ErrorStatus HSEStartStatus;
RCC_DeInit();
RCC_HSEConfig(RCC_HSE_ON);
HSEStartStatus=RCC_WaitForHSEStartUp();

if(HSEStartStatus==SUCCESS)
{
RCC_HCLKConfig(RCC_SYSCLK_Div1);
RCC_PCLK2Config(RCC_HCLK_Div1);
RCC_PCLK1Config(RCC_HCLK_Div2);
FLASH_SetLatency(FLASH_Latency_2);
FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable);

RCC_PLLConfig(RCC_PLLSource_HSE_Div1,RCC_PLLMul_9);
RCC_PLLCmd(ENABLE);
while(RCC_GetFlagStatus(RCC_FLAG_PLLRDY)==RESET);
RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK);
while(RCC_GetSYSCLKSource()!=0x08);
}

RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1 | RCC_APB2Periph_GPIOA,ENABLE);
}

//***********GPIO配置****************//
void GPIO_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
GPIO_InitStructure.GPIO_Pin=GPIO_Pin_9;
GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode=GPIO_Mode_AF_PP;
GPIO_Init(GPIOA,&GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin=GPIO_Pin_10;
GPIO_InitStructure.GPIO_Mode=GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOA,&GPIO_InitStructure);
}
//*************USART1*******************//
void USART_Configuration(void)
{
USART_InitTypeDef USART_InitStructure;
USART_ClockInitTypeDef USART_ClockInitStructure;

USART_ClockInitStructure.USART_Clock=USART_Clock_Disable;
USART_ClockInitStructure.USART_CPOL=USART_CPOL_Low;
USART_ClockInitStructure.USART_CPHA=USART_CPHA_2Edge;
USART_ClockInitStructure.USART_LastBit=USART_LastBit_Disable;
USART_ClockInit(USART1,&USART_ClockInitStructure);

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_Mode=USART_Mode_Rx | USART_Mode_Tx;
USART_InitStructure.USART_HardwareFlowControl=USART_HardwareFlowControl_None;
USART_Init(USART1,&USART_InitStructure);

USART_ITConfig(USART1,USART_IT_RXNE, ENABLE);
      USART_ITConfig(USART1, USART_IT_TXE, DISABLE);

USART_Cmd(USART1,ENABLE);
}

中断函数如下:
vu16 RxBuffer;
void USART1_IRQHandler(void)
{
   if(USART_GetITStatus(USART1, USART_IT_RXNE) != RESET)
      {
         RxBuffer = USART_ReceiveData(USART1);
         USART_ITConfig(USART1, USART_IT_TXE, ENABLE);
         USART_ITConfig(USART1, USART_IT_RXNE, DISABLE);
      }
   if(USART_GetITStatus(USART1, USART_IT_TXE) != RESET)
   {
      USART_SendData(USART1, RxBuffer);
      USART_ITConfig(USART1, USART_IT_TXE, DISABLE);
      USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);
   }
}
//*******************************************//
函数实现功能很简单,只要接收一字节数据再发给PC,
网上查到说只有中断处理才能接收数据,所以使用中断来接收,但不成功,

期待解答与指导,先行谢过!