#include "stdio.h"

void usart_Configuration(void)
{GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
USART_ClockInitTypeDefUSART_ClockInitStructure;
//////////////////////////////////////////////////////////////////
//
USART_ClockInit(USART1, &USART_ClockInitStructure);

USART_InitStructure.USART_BaudRate = 115200;
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_Init(USART1, &USART_InitStructure);


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

USART_ClearFlag(USART1, USART_FLAG_TC);
}

int fputc(int ch, FILE *f)
{


USART_SendData(USART1,(uint8_t) ch);

while (USART_GetFlagStatus(USART1, USART_FLAG_TC) == RESET)
{

}

return ch;
}

int fgetc(FILE *f)
{

while (USART_GetFlagStatus(USART1, USART_FLAG_RXNE) == RESET)
{}
return (int)USART_ReceiveData(USART1);
}

void USART1_IRQHandler(void)
{u16 RxBuf;
if(USART_GetFlagStatus(USART1,USART_IT_RXNE)==SET)
{
RxBuf=USART_ReceiveData(USART1);
//printf("%d",RxBuf);
//printf("");
switch(RxBuf)
{//
case 1: printf("1 ");printf("%d",255);break;//對方發(fā)送是1
case 2: printf("2 ");printf("%d",255);break;//對方發(fā)送是2
case 3: printf("3 ");printf("%d",255);break;//對方發(fā)送是3
default: printf("4 ");printf("%d",255);break;
}
}
if(USART_GetITStatus(USART1, USART_IT_TXE) != RESET)//這段是為了避免STM32 USART 第一個字節(jié)發(fā)不出去的BUG
{
USART_ITConfig(USART1, USART_IT_TXE, DISABLE);//禁止發(fā)緩沖器空中斷，
}
}