STM32F030-IO模拟串口接收发送

一、串口时序图

二、代码-发送部分

/******************************************************
*函数名称:IR_SendByte
*备注：IO模拟串口发送1bit
*入口参数:val 发送的值 
*作者：han
******************************************************/
void IR_SendByte(uint8_t val)
{
     	
	uint8_t i;
	
	JC24B_Set_L;			//起始位，拉低电平
	delay_us(IO_UASRT_bound);	
	for(i = 0; i < 8; i++)		//8位数据位
	{
     
		if(val & 0x01)
		{
     
		 JC24B_Set_H;
		}
		else
		 JC24B_Set_L;
		
	 delay_us(IO_UASRT_bound);
		val >>= 1;
	}
	JC24B_Set_H;			//停止位，拉高电平
	delay_us(IO_UASRT_bound);
}
/******************************************************
*函数名称:IO_UASRT_Send
*备注：IO模拟串口发送一包数据
*入口参数:st 发送的数组 len 发送长度 
*作者：han
******************************************************/
void IO_UASRT_Send(uint8_t *st,uint16_t len)
{
     
    int i=0;
    while ((len--)!=0)
     {
       
        IR_SendByte(st[i]);
         i++;
     }
}

三、代码-接收部分

①IO配置，中断接收

 /**********************IO模拟接收 PB11**************************/		
   GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11;
   GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;			  //浮空输入
	 GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
   GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;	    		 
   GPIO_Init(GPIOB, &GPIO_InitStructure);	  				
   GPIO_SetBits(GPIOB,GPIO_Pin_11); 	
	 SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOB,EXTI_PinSource11);//映射

  	EXTI_InitStructure.EXTI_Line=EXTI_Line11;	
  	EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;	
  	EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;//下降沿
  	EXTI_InitStructure.EXTI_LineCmd = ENABLE;
  	EXTI_Init(&EXTI_InitStructure);	 
		
	  NVIC_InitStructure.NVIC_IRQChannel = EXTI4_15_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;		
		NVIC_Init(&NVIC_InitStructure);
		EXTI_ClearITPendingBit(EXTI_Line11);//清楚中断标志位

②中断接收

/******************************************************
*函数名称:EXTI4_15_IRQHandler
*备注：IO模拟串口接收
*入口参数:
*作者：han
******************************************************/
uint8_t tmp;
uint8_t USART_RX_BUF[USART_REC_LEN]; 
uint16_t USART_RX_STA=0;
void EXTI4_15_IRQHandler(void)
{
     
   uint8_t i=9;
   if(EXTI_GetITStatus(EXTI_Line11) != RESET)
   {
     
     /* Disable the Selected IRQ Channels -------------------------------------*/
   	NVIC->ICER[EXTI4_15_IRQn >> 0x05] =(uint32_t)0x01 << (EXTI4_15_IRQn & (uint8_t)0x1F);
	  EXTI_ClearITPendingBit(EXTI_Line11);
	  delay_us(30);
	  while(i--)
	  {
     
	  	tmp >>=1;
		if(GPIOB->IDR&GPIO_Pin_11) tmp |=0x80;
		 delay_us(IO_UASRT_bound);
	  }

	  if((USART_RX_STA&0x8000)==0)
	  {
     
	  	 if(USART_RX_STA&0x4000)
		 {
     
		  if(tmp!=0x0a) USART_RX_STA=0;
		  else USART_RX_STA |=0x8000;
		 }
		 else
		 {
     
		   if(tmp==0x0d) USART_RX_STA|=0x4000;
		   else 
		   {
     
		    	USART_RX_BUF[USART_RX_STA&0X3FFF]=tmp ;
			    USART_RX_STA++;
				if(USART_RX_STA>(USART_REC_LEN-1))USART_RX_STA=0;//接收数据错误,重新开始接收	  
		   }
		 }
	  
	  }
	  EXTI_ClearITPendingBit(EXTI_Line11);
	  NVIC->ISER[EXTI4_15_IRQn >> 0x05] =
	 (uint32_t)0x01 << (EXTI4_15_IRQn & (uint8_t)0x1F);
   }
}

③其他部分

#define IO_UASRT_bound      104   //波特率计算：（1/波特率）*1000000