Model
stm32f103
uses serial port
USART2
to involve interrupt
USART_IT_RXNE: Receive 1 byte to generate this interrupt
USART_IT_IDLE: Receive a frame of data to generate this interrupt
Serial port configuration function
Pay attention to open the corresponding interrupt!
/* Enable serial port 2 receive interrupt*/
USART_ITConfig(USART2, USART_IT_RXNE, ENABLE);
USART_ITConfig(USART2, USART_IT_IDLE, ENABLE);
/// 配置USART接收中断
static void NVIC_Configuration(void)
{
NVIC_InitTypeDef NVIC_InitStructure;
/* Configure the NVIC Preemption Priority Bits */
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);
/* Enable the USARTy Interrupt */
NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority =1;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}
/*
* 函数名:USARTx_Config
* 描述 :USART GPIO 配置,工作模式配置
* 输入 :无
* 输出 : 无
* 调用 :外部调用
*/
void USART_Config(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
/* config USART2 clock */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
/* USART2 GPIO config */
/* Configure USART2 Tx (PA.02) as alternate function push-pull */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
/* Configure USART2 Rx (PA.03) as input floating */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOA, &GPIO_InitStructure);
/* USART2 mode config */
USART_InitStructure.USART_BaudRate = 9600;
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;
USART_Init(USART2, &USART_InitStructure);
/* 配置中断优先级 */
NVIC_Configuration();
/* 使能串口2接收中断 */
USART_ITConfig(USART2, USART_IT_RXNE, ENABLE);
USART_ITConfig(USART2, USART_IT_IDLE, ENABLE);
NVIC_EnableIRQ( USART2_IRQn );//使能NVIC响应UART2的中断请求
USART_Cmd(USART2, ENABLE);
USART_ClearFlag(USART2, USART_FLAG_TC);
}
interrupt service function
uint8_t str[256] = {0};
uint8_t finish_tar = 0;
void USART2_IRQHandler(void)
{
u8 dat;
static u8 count = 0;
if(USART_GetITStatus(USART2, USART_IT_RXNE) == SET) //接收中断
{
USART_ClearFlag(USART2, USART_IT_RXNE); //清除接收中断标志
str[count] = USART2->DR;
count++;
}
if(USART_GetITStatus(USART2, USART_IT_IDLE) == SET) //空闲中断
{
dat = USART2->DR; //清空闲标志
str[count] = '\0';
count = 0;
finish_tar = 1;
}
}
main function
extern uint8_t str[256];
extern uint8_t finish_tar;
int main(void)
{
// ......
while(1)
{
if(finish_tar == 1)
{
printf("%s\n", str);
memset(str, 0, 256);
finish_tar = 0;
}
}
}