stm32定时触发软件中断

这里使用定时器作为延时，单位为秒，使用exti的软件触发方式，配置见代码，在main里进行触发软件中断

代码

#include "stm32f10x.h"
#include "stm32f10x_gpio.h"
#include "misc.h"
#include "stm32f10x_exti.h"
#include "stm32f10x_tim.h"
int L = 0;
int delay = 0;
void delay_ms(int ms)
{delay = ms;while (delay);
}
void gpioInit(void);
void SystickInit(void);
int main(void)
{gpioInit();SystickInit();while (1){delay_ms(5);EXTI_GenerateSWInterrupt(EXTI_Line0);};}void gpioInit(void)
{GPIO_InitTypeDef GPIO_InitStructure;SystemInit();// RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC, ENABLE);GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13;GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;GPIO_Init(GPIOC, &GPIO_InitStructure);GPIO_SetBits(GPIOC, GPIO_Pin_13);// GPIO_ResetBits(GPIOC, GPIO_Pin_13);
}
void SystickInit(void)
{TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure; // 定义一个定时器初始化参数结构体NVIC_InitTypeDef NVIC_InitStructure;EXTI_InitTypeDef EXTI_InitStructure;						// 定义 NVIC 初始化结构体RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);		// 开启 APB1 的 TIM2 外设时钟TIM_DeInit(TIM2);											// 将外设 TIM2 的寄存器重设为缺省值TIM_TimeBaseStructure.TIM_Prescaler = (7200 - 1);			// 设置预分频系数为（7200-1）TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; // 向上计数模式TIM_TimeBaseStructure.TIM_Period = 10000;					// 自动加载值设置，累计 10000 个时钟周期（1s）后溢出TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);				// 根据 TIM_TimeBaseStructure 中指定的参数初始化 TIM2 里的相关寄存器TIM_ClearFlag(TIM2, TIM_FLAG_Update);						// 清除溢出中断标志TIM_ITConfig(TIM2, TIM_IT_Update, ENABLE);					// 使能 TIM2 中断，允许更新中断TIM_Cmd(TIM2, ENABLE);										// 使能 TIM2 外设NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);			  // 选择中断优先级分组 2 4位抢占 4位响应NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn;			  // 选择配置 TIM2 全局中断NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2; // 抢占优先级为 2NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;		  // 响应优先级为 0NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;			  // 使能 TIM2 中断通道NVIC_Init(&NVIC_InitStructure);NVIC_InitStructure.NVIC_IRQChannel = EXTI0_IRQn;		  // 选择要触发的中断NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 3; // 设置抢占优先级NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;		  // 设置响应优先级NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;			  // 使能中断NVIC_Init(&NVIC_InitStructure);EXTI_InitStructure.EXTI_Line = EXTI_Line0;EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Event;// EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling; // 下降沿EXTI_InitStructure.EXTI_LineCmd = ENABLE;EXTI_Init(&EXTI_InitStructure); // 根据以上配置初始化 NVIC
}void EXTI0_IRQHandler(void) // 定义外部中断0的中断处理函数
{if (EXTI_GetITStatus(EXTI_Line0) != RESET) // 检测到 EXTI Line0 上的中断{L = !L;if (L){GPIO_SetBits(GPIOC, GPIO_Pin_13);}else{GPIO_ResetBits(GPIOC, GPIO_Pin_13);}EXTI_ClearITPendingBit(EXTI_Line0); // 清除中断标志位}
}
void TIM2_IRQHandler(void)
{if (TIM_GetITStatus(TIM2, TIM_IT_Update) != RESET) // 1S 时间到，检测到 TIM2 中断{// EXTI_GenerateSWInterrupt(EXTI_Line0); // 触发外部中断 0if (delay > 0)delay--;;TIM_ClearITPendingBit(TIM2, TIM_FLAG_Update); // 清除中断标志位}
}