EEPW论坛

我的串口下载是用外接2303下载的。。
软件仿真可以实现功能，但是下载在开发板就不行了。。
不知道什么原因。。下面是代码。

#include "stm32f10x.h"
#include "stdio.h"
#include "SysTickDelay.h"

void USART1_Configuration(void);
//int fputc(int ch, FILE *f);

int main(void)
{
 SystemInit();
 SysTick_Initaize();   
    USART1_Configuration();
 while(1)
    {
  printf("EEPW ARM DIY 奋斗STM32 \r\n");
  delay_ms(100);
    }
}

/*******************************************************************************
* Function Name  : 重定义系统putchar函数int fputc(int ch, FILE *f)
* Description    : 串口发一个字节
* Input          : int ch, FILE *f
* Output         :
* Return         : int ch
* 这个是使用printf的关键
*******************************************************************************/
//int fputc(int ch, FILE *f)
//{
//    USART_SendData(USART1, (u8) ch);
//    //USART1->DR = (u8) ch;  
//    /* Loop until the end of transmission */
//    while(USART_GetFlagStatus(USART1, USART_FLAG_TXE) == RESET)
//    {
//    }
//
//    return ch;
//}

void USART1_Configuration(void)
{
 GPIO_InitTypeDef GPIO_InitStructure;
    USART_InitTypeDef USART_InitStructure;
 NVIC_InitTypeDef NVIC_InitStructure;
 RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_AFIO |RCC_APB2Periph_USART1, ENABLE);

     //USART1_TX
    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);
   
    //USART1_RX
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    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_Tx | USART_Mode_Rx;
    USART_Init(USART1, &USART_InitStructure);
   
    USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);
   
    USART_Cmd(USART1, ENABLE);

    NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
    NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure);
}