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STM23学习记录2：外部中断，串口通信，定时器

发布时间 2023-08-23 20:41:56作者: zxkic

外部中断：

向量表：异常+中断

所有端口的PIN0对应着EXTI0中短线，PIN1对应EXTI1中断线，依次类推

16个外部中断线，对应7个外部中断入口地址

配置中断优先级的4位要同时完成抢占优先级和响应优先级（子优先级或副优先级）的配置：两组优先级

2+2，2^2抢占，2^2响应比较常用

使用NVIC_PriorityGroupConfig(NVIC_PriorityGroup_X)来设定

 

串口通信：

USART1_IRQHandler(void) 串口中断服务程序

 



void Serial_Init(void)
{
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
	
	GPIO_InitTypeDef GPIO_InitStructure;
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
	GPIO_Init(GPIOA, &GPIO_InitStructure);
	
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
	GPIO_Init(GPIOA, &GPIO_InitStructure);
	
	USART_InitTypeDef USART_InitStructure;
	USART_InitStructure.USART_BaudRate = 9600;
	USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
	USART_InitStructure.USART_Mode = USART_Mode_Tx | USART_Mode_Rx;
	USART_InitStructure.USART_Parity = USART_Parity_No;
	USART_InitStructure.USART_StopBits = USART_StopBits_1;
	USART_InitStructure.USART_WordLength = USART_WordLength_8b;
	USART_Init(USART1, &USART_InitStructure);
	
	USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);
	
	NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
	
	NVIC_InitTypeDef NVIC_InitStructure;
	NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
	NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
	NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
	NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
	NVIC_Init(&NVIC_InitStructure);
	
	USART_Cmd(USART1, ENABLE);
}


 




 


 




1 void USART1_IRQHandler(void)
2 {
3     if (USART_GetITStatus(USART1, USART_IT_RXNE) == SET)
4     {
5         Serial_RxData = USART_ReceiveData(USART1);
6         Serial_RxFlag = 1;
7         USART_ClearITPendingBit(USART1, USART_IT_RXNE);
8     }
9 }




 


定时器：计数频率，计数个数


 


看门狗：


窗口看门狗：采用系统时钟，监控软件的运行异常


独立看门狗：通过一个12bit的计数器对设定频率减计数，采用独立时钟，监控芯片异常