[求助] 跪求大神解析

stm32菜鸟 2012-8-8 15:32 楼主

小弟看资料写的USART1的程序，想与上位机通信，但是无法接受数据……求大神教育
/* Includes ------------------------------------------------------------------*/
#include "stm32f10x.h"
#include "platform_config.h"

GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;

/* Private function prototypes -----------------------------------------------*/
void RCC_Configuration(void);
void GPIO_Configuration(void);
void NVIC_Configuration(void);

int main(void)
{

  RCC_Configuration();

  NVIC_Configuration();

  GPIO_Configuration();

  GPIO_SetBits(GPIO_LED,DS1_PIN|DS2_PIN|DS3_PIN|DS4_PIN);/*关闭所有的LED指示灯*/

  USART_InitStructure.USART_BaudRate = 115200;             /*设置波特率为115200*/
  USART_InitStructure.USART_WordLength = USART_WordLength_8b;/*设置数据位为8*/
  USART_InitStructure.USART_StopBits = USART_StopBits_1;    /*设置停止位为1位*/
  USART_InitStructure.USART_Parity = USART_Parity_No;       /*无奇偶校验*/
  USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;/*无硬件流控*/
  USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;  /*发送和接收*/

  /*配置串口1 */
  USART_Init(USART1, &USART_InitStructure);

  /*使能串口1的发送和接收中断*/
  USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);
  USART_ITConfig(USART1, USART_IT_TXE, ENABLE);

  /* 使能串口1 */
  USART_Cmd(USART1, ENABLE);

  while (1)
  {
    USART_SendData(USART1, 'a');
  }
}

void RCC_Configuration(void)
{
  /*使能串口1使用的GPIO时钟*/
  RCC_APB2PeriphClockCmd(USART1_GPIO_CLK , ENABLE);
  /*使能串口1时钟*/
  RCC_APB2PeriphClockCmd(USART1_CLK, ENABLE);
  /*使能LED灯使用的GPIO时钟*/
  RCC_APB2PeriphClockCmd(RCC_GPIO_LED, ENABLE);
}

/**
  * @brief  Configures the different GPIO ports.
  * @param  None
  * @retval None
  */
void GPIO_Configuration(void)
{
  GPIO_InitTypeDef GPIO_InitStructure;

  /*串口1 RX管脚配置*/
  /* Configure USART1 Rx as input floating */
  GPIO_InitStructure.GPIO_Pin = USART1_RxPin;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
  GPIO_Init(USART1_GPIO, &GPIO_InitStructure);

  /*串口1 TX管脚配置*/
  /* Configure USART1 Tx as alternate function push-pull */
  GPIO_InitStructure.GPIO_Pin = USART1_TxPin;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
  GPIO_Init(USART1_GPIO, &GPIO_InitStructure);

  /* 配置神舟III号LED灯使用的GPIO管脚模式*/
  GPIO_InitStructure.GPIO_Pin = DS1_PIN|DS2_PIN|DS3_PIN|DS4_PIN;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_Init(GPIO_LED, &GPIO_InitStructure);
}

void NVIC_Configuration(void)
{
  NVIC_InitTypeDef NVIC_InitStructure;

  /* Configure the NVIC Preemption Priority Bits */
  NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);

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