STM32 serial interrupt instance two

By Motherboard 
int main(void )

{

 uint8_t a=0;//LED high and low voltage control



 /* System Clocks Configuration */

 RCC_Configuration(); //System clock settings

 /*Nested vector interrupt controller

 Explains that USART1 preempts priority level 0 (up to 1 digit), and sub-priority level 0 (up to 7 digits) */ 

 NVIC_Configuration(); //Interrupt source configuration

 /* initializes the IO port that controls the LED indicator, and configures the port as Push-pull pull-up output, the port line speed is 50Mhz. PA9 and PA10 ports are multiplexed as TX and RX of serial port 1.

 When configuring a port line, first enable the clock of the port where it is located. Otherwise, the configuration cannot be successful. Because port B is used, the clock of this port

 Enable, and at the same time, because the multiplexed IO port function is used, it is used to configure the serial port. Therefore, the AFIO (multiplexed function IO) clock must also be enabled. */

 GPIO_Configuration(); //Port initialization

 USART_Config(USART1); //Serial port 1 initialization



 while (1)

 {

 if(rec_f == 1)

 {

 // Determine whether a frame of valid data has been received 

 rec_f = 0;



 for(i=0; i<sizeof(TxBuffer1); i++) //Send string

 {

 USART_SendChar(USART1,TxBuffer1[i]);

 Delay(0x0000ff0);

}

 /*for(i=0;i {

 USART_SendChar(USART1,RxBuffer1[i]);

} */

 if(a==0)

 {

 GPIO_SetBits(GPIOD, GPIO_Pin_2); //LED1 flashes bright and dark span>

 a=1;

}

 else

 {

 GPIO_ResetBits(GPIOD, GPIO_Pin_2);

 a=0;

}

}

}

}

The main function is as above.

Related variables

uint8_t TxBuffer1[] = "USART Interrupt Example: This is USART1 DEMO";

uint8_t RxBuffer1[], rec_f, tx_flag, i;



__IO uint8_t TxCounter1 = 0x00;

__IO uint8_t RxCounter1 = 0x00;



uint32_t Rec_Len;

The serial port interrupt function configuration is as follows:

//------------------------- -------------------------------------------------- -----------

void USART_SendChar(USART_TypeDef* USARTx,uint8_t data)

{

 USART_SendData(USARTx,data);

 while(USART_GetFlagStatus(USARTx,USART_FLAG_TC)==RESET);

}

//------------ -------------------------------------------------- ------------------------

void USART_Config(USART_TypeDef* USARTx)

{

 USART_InitStructure.USART_BaudRate = 19200; //The rate is 19200bps

 USART_InitStructure.USART_WordLength = USART_WordLength_8b; //8 data bits

 USART_InitStructure.USART_StopBits = USART_StopBits_1; //Stop bit 1 bit

 USART_InitStructure.USART_Parity = USART_Parity_No; //No parity

 USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None; //No hardware flow control

 USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx; //transceiver mode



 /* Configure USARTx */

 USART_Init(USARTx, &USART_InitStructure); //Configure serial port parameter function< /span>





 /* Enable USARTx Receive and Transmit interrupts */

 USART_ITConfig(USARTx, USART_IT_RXNE, ENABLE); //Enable reception Interrupted

 USART_ITConfig(USARTx, USART_IT_TXE, ENABLE); //Enable transmit buffer empty interrupt< /span>



 /* Enable the USARTx */

 USART_Cmd(USARTx, ENABLE);

}

//------------ -------------------------------------------------- ------------------------

void Delay(__IO uint32_t nCount)

{

 for(; nCount!=0; nCount- -);

}

/*------------ -------------------------------------------------- ------------------------

The system clock is configured as 72MHZ+ peripheral clock configuration*/

void RCC_Configuration(void)

{

 SystemInit();

 RCC_APB2PeriphClockCmd( RCC_APB2Periph_USART1 | RCC_APB2Periph_GPIOD |RCC_APB2Periph_GPIOA, ENABLE);

}

//------------ -------------------------------------------------- ------------------------

void GPIO_Configuration(void)

{

 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2; //LED1 control--PD2< /span>

 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; //Push-pull output

 GPIO_InitStructure.GPIO_Speed ​​= GPIO_Speed_50MHz;

 GPIO_Init(GPIOD, &GPIO_InitStructure);



 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9; //USART1 TX

 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //multiplexed push-pull output

 GPIO_Init(GPIOA, &GPIO_InitStructure); //A port



 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10; //USART1 RX

 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; //multiplexed open drain input

 GPIO_Init(GPIOA, &GPIO_InitStructure); //A port

}

//------------ -------------------------------------------------- ------------------------

void NVIC_Configuration(void)

{

 /* Structure declaration*/

 NVIC_InitTypeDef NVIC_InitStructure;



 /* Configure the NVIC Preemption Priority Bits */

 /* Configure one bit for preemption priority */

 /* The priority group describes the number of bits used to preempt the priority, and the sub-priority The number of digits used here is 1, 7 */

 NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);



 NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn; //Set serial port 1 interrupt= USART1_IRQn; span>

 NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; //Preemption priority 0

 NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; //The child priority is 0

 NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //Enable

 NVIC_Init(&NVIC_InitStructure);

}

Write the usart function in the interrupt service function. 

//Serial port 1 interrupt service routine 

void USART1_IRQHandler(void)

{

 unsigned int i;



 // Determine whether the read register is not empty

 if(USART_GetITStatus(USART1, USART_IT_RXNE) != RESET)

 {

 //Cache the read register data in the receive buffer< /span>

 RxBuffer1[RxCounter1++] = USART_ReceiveData(USART1);



 // Determine whether the end flag is 0x0d 0x0a

 if(RxBuffer1[RxCounter1-2] == 0x0d && RxBuffer1[RxCounter1-1] ==  0x0a)

 {

 for(i=0; i< RxCounter1; i++)

 TxBuffer1[i] = RxBuffer1[i]; //will receive The data in the buffer is transferred to the sending buffer, ready to be forwarded



 //receive success sign

 rec_f = 1;



 //Send buffer terminator

 TxBuffer1[RxCounter1] = 0;

 TxCounter1 = RxCounter1;

 RxCounter1 = 0;

}

}



 //This paragraph is to avoid the first byte of STM32 USART BUG that can’t be posted

 if(USART_GetITStatus(USART1, USART_IT_TXE) != RESET)

 {

 //It is forbidden to send buffer empty interrupts,

 USART_ITConfig(USART1, USART_IT_TXE, DISABLE);

}



}

The operation result is as follows, do not fill in any characters when sending, send it directly, and display RT Interrupt Example: This is USART1 DEMO, indicating that the first three characters have been occupied and replaced.

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int main( void)

{

 uint8_t a=0;//LED high and low voltage control



 /* System Clocks Configuration */

 RCC_Configuration(); //System clock settings

 /*Nested vector interrupt controller

 Explains that USART1 preempts priority level 0 (up to 1 digit), and sub-priority level 0 (up to 7 digits) */ 

 NVIC_Configuration(); //Interrupt source configuration

 /* initializes the IO port that controls the LED indicator, and configures the port as Push-pull pull-up output, the port line speed is 50Mhz. PA9 and PA10 ports are multiplexed as TX and RX of serial port 1.

 When configuring a port line, first enable the clock of the port where it is located. Otherwise, the configuration cannot be successful. Because port B is used, the clock of this port

 Enable, and at the same time, because the multiplexed IO port function is used, it is used to configure the serial port. Therefore, the AFIO (multiplexed function IO) clock must also be enabled. */

 GPIO_Configuration(); //Port initialization

 USART_Config(USART1); //Serial port 1 initialization



 while (1)

 {

 if(rec_f == 1)

 {

 // Determine whether a frame of valid data has been received 

 rec_f = 0;



 for(i=0; i<sizeof(TxBuffer1); i++) //Send string

 {

 USART_SendChar(USART1,TxBuffer1[i]);

 Delay(0x0000ff0);

}

 /*for(i=0;i {

 USART_SendChar(USART1,RxBuffer1[i]);

} */

 if(a==0)

 {

 GPIO_SetBits(GPIOD, GPIO_Pin_2); //LED1 flashes bright and dark span>

 a=1;

}

 else

 {

 GPIO_ResetBits(GPIOD, GPIO_Pin_2);

 a=0;

}

}

}

}

uint8_t TxBuffer1[] = "USART Interrupt Example: This is USART1 DEMO";

uint8_t RxBuffer1[], rec_f, tx_flag, i;



__IO uint8_t TxCounter1 = 0x00;

__IO uint8_t RxCounter1 = 0x00;



uint32_t Rec_Len;

//--------------------------------------------- -----------------------------------------

void USART_SendChar(USART_TypeDef* USARTx,uint8_t data)

{

 USART_SendData(USARTx,data);

 while(USART_GetFlagStatus(USARTx,USART_FLAG_TC)==RESET);

}

//------------ -------------------------------------------------- ------------------------

void USART_Config(USART_TypeDef* USARTx)

{

 USART_InitStructure.USART_BaudRate = 19200; //The rate is 19200bps

 USART_InitStructure.USART_WordLength = USART_WordLength_8b; //8 data bits

 USART_InitStructure.USART_StopBits = USART_StopBits_1; //Stop bit 1 bit

 USART_InitStructure.USART_Parity = USART_Parity_No; //No parity

 USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None; //No hardware flow control

 USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx; //transceiver mode



 /* Configure USARTx */

 USART_Init(USARTx, &USART_InitStructure); //Configure serial port parameter function< /span>





 /* Enable USARTx Receive and Transmit interrupts */

 USART_ITConfig(USARTx, USART_IT_RXNE, ENABLE); //Enable reception Interrupted

 USART_ITConfig(USARTx, USART_IT_TXE, ENABLE); //Enable transmit buffer empty interrupt< /span>



 /* Enable the USARTx */

 USART_Cmd(USARTx, ENABLE);

}

//------------ -------------------------------------------------- ------------------------

void Delay(__IO uint32_t nCount)

{

 for(; nCount!=0; nCount- -);

}

/*------------ -------------------------------------------------- ------------------------

The system clock is configured as 72MHZ+ peripheral clock configuration*/

void RCC_Configuration(void)

{

 SystemInit();

 RCC_APB2PeriphClockCmd( RCC_APB2Periph_USART1 | RCC_APB2Periph_GPIOD |RCC_APB2Periph_GPIOA, ENABLE);

}

//------------ -------------------------------------------------- ------------------------

void GPIO_Configuration(void)

{

 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2; //LED1 control--PD2< /span>

 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; //Push-pull output

 GPIO_InitStructure.GPIO_Speed ​​= GPIO_Speed_50MHz;

 GPIO_Init(GPIOD, &GPIO_InitStructure);



 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9; //USART1 TX

 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //multiplexed push-pull output

 GPIO_Init(GPIOA, &GPIO_InitStructure); //A port



 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10; //USART1 RX

 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; //multiplexed open drain input

 GPIO_Init(GPIOA, &GPIO_InitStructure); //A port

}

//------------ -------------------------------------------------- ------------------------

void NVIC_Configuration(void)

{

 /* Structure declaration*/

 NVIC_InitTypeDef NVIC_InitStructure;



 /* Configure the NVIC Preemption Priority Bits */

 /* Configure one bit for preemption priority */

 /* The priority group describes the number of bits used to preempt the priority, and the sub-priority The number of digits used here is 1, 7 */

 NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);



 NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn; //Set serial port 1 interrupt= USART1_IRQn; span>

 NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; //Preemption priority 0

 NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; //The child priority is 0

 NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //Enable

 NVIC_Init(&NVIC_InitStructure);

}

//Serial port 1 interrupt service routine

void USART1_IRQHandler(void)

{

 unsigned int i;



 // Determine whether the read register is not empty

 if(USART_GetITStatus(USART1, USART_IT_RXNE) != RESET)

 {

 //Cache the read register data in the receive buffer< /span>

 RxBuffer1[RxCounter1++] = USART_ReceiveData(USART1);



 // Determine whether the end flag is 0x0d 0x0a

 if(RxBuffer1[RxCounter1-2] == 0x0d && RxBuffer1[RxCounter1-1] ==  0x0a)

 {

 for(i=0; i< RxCounter1; i++)

 TxBuffer1[i] = RxBuffer1[i]; //will receive The data in the buffer is transferred to the sending buffer, ready to be forwarded



 //receive success sign

 rec_f = 1;



 //Send buffer terminator

 TxBuffer1[RxCounter1] = 0;

 TxCounter1 = RxCounter1;

 RxCounter1 = 0;

}

}



 //This paragraph is to avoid the first byte of STM32 USART发不出去的BUG

    if(USART_GetITStatus(USART1, USART_IT_TXE) != RESET)                   

 {

        //禁止发缓冲器空中断，

        USART_ITConfig(USART1, USART_IT_TXE, DISABLE);                         

}



}

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