STM32 - serial port learning notes (one byte, 16 bit data, string, array)

One 、 Serial port related configuration

void uart_init(u32 bound){
  //GPIO Port settings 
  GPIO_InitTypeDef GPIO_InitStructure;
	USART_InitTypeDef USART_InitStructure;
	NVIC_InitTypeDef NVIC_InitStructure;
	 
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1|RCC_APB2Periph_GPIOA, ENABLE);	// Can make USART1,GPIOA The clock 
  
	//USART1_TX   GPIOA.9
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9; //PA.9          USART1 Of RXD、TXD Pin   You also need to check the data manual 
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;	// Multiplexing push pull output     These two modes need to check the data manual 8.1.11
  GPIO_Init(GPIOA, &GPIO_InitStructure);// initialization GPIOA.9
   
  //USART1_RX	  GPIOA.10 initialization 
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;//PA10
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;// Floating input 
  GPIO_Init(GPIOA, &GPIO_InitStructure);// initialization GPIOA.10  

  //Usart1 NVIC  To configure 
  NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
	NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=3 ;// preemption 3
	NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;		// Sub priority 3
	NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;			//IRQ Channel enable 
	NVIC_Init(&NVIC_InitStructure);	// Initialize... According to the specified parameters VIC register 
  
   //USART  Initialize settings 

	USART_InitStructure.USART_BaudRate = bound;// Serial port baud rate 
	USART_InitStructure.USART_WordLength = USART_WordLength_8b;// The word is 8 Bit data format 
	USART_InitStructure.USART_StopBits = USART_StopBits_1;// A stop bit 
	USART_InitStructure.USART_Parity = USART_Parity_No;// No parity bit 
	USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;// No hardware data flow control 
	USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;	// Transceiver mode 

  USART_Init(USART1, &USART_InitStructure); // Initialize serial port 1
  USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);// Open serial port to accept interrupt 
  USART_Cmd(USART1, ENABLE);                    // Enable serial port 1 

}

Two 、 Serial port sending data function encapsulation

1、 Send a byte

void Usart_SendByte( USART_TypeDef * pUSARTx, uint8_t ch)
{
	/*  Send a byte of data to USART */
	USART_SendData(pUSARTx,ch);
		
	/*  Wait for the send data register to be empty  */
	while (USART_GetFlagStatus(pUSARTx, USART_FLAG_TXE) == RESET);	
}

2、 Send a 16 Bit data

void Usart_SendHalfWord( USART_TypeDef * pUSARTx, uint16_t ch)
{
	uint8_t temp_h, temp_l;
	
	/*  Take out the top eight  */
	temp_h = (ch&0XFF00)>>8;
	/*  Take out the lower eight  */
	temp_l = ch&0XFF;
	
	/*  Send the upper eight digits  */
	USART_SendData(pUSARTx,temp_h);	
	while (USART_GetFlagStatus(pUSARTx, USART_FLAG_TXE) == RESET);
	
	/*  Send the lower eight bits  */
	USART_SendData(pUSARTx,temp_l);	
	while (USART_GetFlagStatus(pUSARTx, USART_FLAG_TXE) == RESET);	
}

3、 send out 8 Bit array

 Example ：
#define  DEBUG_USART5                    UART5
uint8_t card_num_main[16]; 
Usart_SendArray( DEBUG_USART5,card_num_main, 16);


void Usart_SendArray( USART_TypeDef * pUSARTx, uint8_t *array, uint16_t num)
{
  uint8_t i;
	
	for(i=0; i<num; i++)
  {
	    /*  Send a byte of data to USART */
	    Usart_SendByte(pUSARTx,array[i]);	
  
  }
	/*  Wait for the send to complete  */
	while(USART_GetFlagStatus(pUSARTx,USART_FLAG_TC)==RESET);
}

4、 String sending function

void HMISends(char *buf1)		  // String sending function 
{
	uint8_t i=0;
	while(1)
	{
	 if(buf1[i]!='\0')
	 {
			USART_SendData(DEBUG_USART2,buf1[i]);  // Send a byte 
			while(USART_GetFlagStatus(DEBUG_USART2,USART_FLAG_TXE)==RESET){};// Wait for the end of sending 
		 	i++;
	 }
	 else 
	 return ;

	}
}

5、 Convert text to digital send

 Serial port interrupt reception ：
void USART1_IRQHandler(void)                	// A serial port 1 Interrupt service routine 
	{
	u8 Res,temp;
#if SYSTEM_SUPPORT_OS 		// If SYSTEM_SUPPORT_OS It's true , Support is needed OS.
	OSIntEnter();    
#endif
		Res =USART_ReceiveData(USART1);	// Read received data   // A byte 
		temp=Res-'0';
	
		USART_RX_BUF[USART_RX_STA&0X3FFF]=temp ;
		USART_RX_STA++;
	   if(temp==1)
	    LED0=0;
	   if(temp==2)
		LED0=1;
    
#if SYSTEM_SUPPORT_OS 	// If SYSTEM_SUPPORT_OS It's true , Support is needed OS.
	OSIntExit();  											 
#endif
} 
#endif	


 send out ：
 	while(1)
	{
	  len=USART_RX_STA&0x3fff;// The length of data received this time 
	  if(len>0)
		{
			for(t=0;t<len;t++)
			{
				USART_SendData(USART1, USART_RX_BUF[t]);// Serial port 1 send data 
				while(USART_GetFlagStatus(USART1,USART_FLAG_TC)!=SET);// Wait for the end of sending 
			}
			USART_RX_STA=0;
		}	
	}

6、 The serial port receives single byte data , And send the

u8 temp;
void USART1_IRQHandler(void)                	// A serial port 1 Interrupt service routine 
{
	u8 Res;
#if SYSTEM_SUPPORT_OS 		// If SYSTEM_SUPPORT_OS It's true , Support is needed OS.
	OSIntEnter();    
#endif
	if(USART_GetITStatus(USART1, USART_IT_RXNE) != RESET)  // Receive interrupt ( The data received must be 0x0d 0x0a ending )
	{
		Res =USART_ReceiveData(USART1);	// Read received data   // A byte 
		temp = Res;
	    USART_SendData(USART1, temp);// Serial port 1 send data 
		while(USART_GetFlagStatus(USART1,USART_FLAG_TC)!=SET);// Wait for the end of sending 
		 
     } 
#if SYSTEM_SUPPORT_OS 	// If SYSTEM_SUPPORT_OS It's true , Support is needed OS.
	OSIntExit();  											 
#endif
} 
#endif	



extern u8 temp;
while(1)
{
    if(temp == 0x01)
    {
      temp=0;
      LED0=1;
    }
    else if(temp == 0x02)
     {
      temp=0;
      LED0=0;
    }
}