stm32 USART 예제

#include "stm32f10x.h"
#include "stm32f10x_usart.h"
void SerialPutChar(uint8_t c);
void Serial_PutString(uint8_t *s);
int main()
{
 USART_InitTypeDef USART_InitStructure;
 GPIO_InitTypeDef GPIO_InitStructure;
 NVIC_InitTypeDef NVIC_InitStructure;
 GPIO_InitTypeDef PORTC;

 RCC_APB2PeriphClockCmd(RCC_APB1Periph_PWR,ENABLE); //pwr 클럭 생성
 RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1,ENABLE);//usart 클럭 생성

 RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOC, ENABLE);

 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;    /*UART1_TX*/
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
  GPIO_Init(GPIOA, &GPIO_InitStructure);

  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;    /*UART1_RX*/
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
  GPIO_Init(GPIOA, &GPIO_InitStructure); 
 PORTC.GPIO_Pin = GPIO_Pin_1;
 PORTC.GPIO_Speed = GPIO_Speed_10MHz;
 PORTC.GPIO_Mode = GPIO_Mode_IN_FLOATING;
 GPIO_Init(GPIOC, &PORTC);

 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;

 NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x01;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x00;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; 
  NVIC_Init( &NVIC_InitStructure );

 USART_Init(USART1, &USART_InitStructure);   
  USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);
  USART_Cmd(USART1, ENABLE);
0

 while(1)
 {
  //Serial_PutString("1");
  if(GPIO_ReadInputDataBit(GPIOC, GPIO_Pin_1 )!=1)
  {
   Serial_PutString("\r\n Hello!\n");
  }

 }
}
void SerialPutChar(uint8_t c)
{
 USART_SendData(USART1,c);
 while(USART_GetFlagStatus(USART1,USART_FLAG_TXE)==RESET);
}
void Serial_PutString(uint8_t *s)
{
 while(*s !='\0')
 {
  SerialPutChar(*s);
  s++;
 }
}