init_usart.h

STM32_LCD5110资料

#ifndef _INIT_USART_
#define	_INIT_USART_

//#ifdef __GNUC__  /* With GCC/RAISONANCE, small printf (option LD Linker->Libraries->Small printf???? set to 'Yes') calls __io_putchar() */
//  #define PUTCHAR_PROTOTYPE int __io_putchar(int ch)

//#else
//  #define PCHAR_PROTOTYPE int fputc(int ch, FILE *f)

//#endif /* __GNUC__ UT*/

/*******************************************************************************
* 函 数 名  : USART_Configuration
* 函数功能  : 对USART1进行初始化
*******************************************************************************/
void Init_USART(void)
{
  USART_InitTypeDef USART_InitStructure;
  GPIO_InitTypeDef GPIO_InitStructure;

  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;			//配置串口相关引脚				  
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  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 configuration ------------------------------------------------------*/
/* USART1 configured as follow:
        - BaudRate = 115200 baud  
        - Word Length = 8 Bits
        - One Stop Bit
        - No parity
        - Hardware flow control disabled (RTS and CTS signals)
        - Receive and transmit enabled
        - USART Clock disabled
        - USART CPOL: Clock is active low
        - USART CPHA: Data is captured on the middle 
        - USART LastBit: The clock pulse of the last data bit is not output to 
                         the SCLK pin
*/
  USART_InitStructure.USART_BaudRate = 115200;	    //设置串口波特率为115200
  USART_InitStructure.USART_WordLength = USART_WordLength_8b;	   //8位传输
  USART_InitStructure.USART_StopBits = USART_StopBits_1;	  //1个停止位
  USART_InitStructure.USART_Parity = USART_Parity_No;		 //无校验位
  USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;      //禁止硬件流控制，禁止RTS和CTS信号
  USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;		//允许接收和发送
  /*
  USART_InitStructure.USART_Clock = USART_Clock_Disable;		//串口时钟低电平活动
  USART_InitStructure.USART_CPOL = USART_CPOL_Low;
  USART_InitStructure.USART_CPHA = USART_CPHA_2Edge;
  USART_InitStructure.USART_LastBit = USART_LastBit_Disable; 	   
  */
  USART_Init(USART1, &USART_InitStructure);		 //初始化USART1

 //USART_ClearFlag(USART1, USART_FLAG_TC);    //清除发送完成标志位 

  USART_Cmd(USART1, ENABLE);    //使能USART1
}

/*******************************************************************************
* Function Name  : fputc
* Description    : Retargets the C library printf function to the USART.
*******************************************************************************/
int fputc(int ch, FILE *f)
{
  /* Place your implementation of fputc here */
  /* e.g. write a character to the USART */
  USART_SendData(USART1, (u8) ch);	  //发送一字节数据

  /* Loop until the end of transmission */
  while(USART_GetFlagStatus(USART1, USART_FLAG_TC) == RESET);  //等待发送完成
  
  return ch;
}

/*******************************************************************************
* 函 数 名  : SendString
* 函数功能  : 字符串发送
*******************************************************************************/
//void SendString(unsigned char *s)
//{
//  while(*s != '\0')// \0 表示字符串结束标志，通过检测是否字符串末尾           
//  {
//    USART_SendData(USART1, *s);	  //发送一个字节
//	while(USART_GetFlagStatus(USART1, USART_FLAG_TC) == RESET);  //等待发送完成
//    s++;
//  }
//} 

#endif