STM32开发记录一：外部中断之软中断SWI使用

一、SWI使用

1、学习FreeRTOS过程中需要软件产生一个中断，stm32提供了很好的方法。直接调用EXTI_GenerateSWInterrupt()即可。

二、具体参考如下：

1、exti配置，假定用EXTI_Line2 (EXTI_Linex where x can be (0..19))

#include "exit.h"

void ExitConfig(void)
{
	EXTI_InitTypeDef EXTI_InitStruct;
	NVIC_InitTypeDef NVIC_InitStructure;

	EXTI_InitStruct.EXTI_Line=EXTI_Line2;
	EXTI_InitStruct.EXTI_Mode = EXTI_Mode_Interrupt;
	EXTI_InitStruct.EXTI_Trigger = EXTI_Trigger_Rising_Falling; //下降沿触发
	EXTI_InitStruct.EXTI_LineCmd = ENABLE;
	EXTI_Init(&EXTI_InitStruct); //初始化中断线参数
	
	NVIC_InitStructure.NVIC_IRQChannel = EXTI2_IRQn; //选择外部中断2
	NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x02; //抢占优先级 2，
	NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x02; //子优先级 2
	NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //使能外部中断通道
	NVIC_Init(&NVIC_InitStructure);
}

2、在需要的地方打开中断： EXTI_GenerateSWInterrupt(EXTI_Line2);

#include "FreeRTOS.h"
#include "task.h"
#include "sys.h"  
#include "led.h" 
#include "uart.h"
#include "delay.h"

#define LED1_GPIO_GROUP 				GPIOB
#define LED1_GPIO_PIN_NUM				(GPIO_Pin_5)
#define LED1_CLOCK_ENABLE				RCC_APB2Periph_GPIOB

/*-----------------------------------------------------------------------------*
 * name	 	  :led_init
 * brief 	  :led呼吸灯初始化设定，即IO口设定
 * parameter  :无
 * return	  :无
 * caller	  :外部调用
 *-----------------------------------------------------------------------------*/
void led_init(void)
{
	GPIO_InitTypeDef GPIO_InitStructure;
	RCC_APB2PeriphClockCmd(LED1_CLOCK_ENABLE, ENABLE);
	GPIO_InitStructure.GPIO_Pin		=		LED1_GPIO_PIN_NUM;
	GPIO_InitStructure.GPIO_Speed	=		GPIO_Speed_50MHz;
	GPIO_InitStructure.GPIO_Mode	=		GPIO_Mode_Out_PP;
	GPIO_Init(LED1_GPIO_GROUP, &GPIO_InitStructure);
}
	
/*-----------------------------------------------------------------------------*
 * name	 	  :led_control()
 * brief 	  :控制呼吸灯开关
 * parameter  :无
 * return	  :无
 * caller	  :led_breath调用
 *-----------------------------------------------------------------------------*/
void led_control(int led_num, int status)
{
	led_num = led_num;
	if(status == LED_ON){
		 GPIO_SetBits(LED1_GPIO_GROUP, LED1_GPIO_PIN_NUM);
	}
	else if(status == LED_OFF){
		GPIO_ResetBits(LED1_GPIO_GROUP, LED1_GPIO_PIN_NUM);
	}
}
/*-----------------------------------------------------------------------------*
 * name	 	  :led_breath()
 * brief 	  :呼吸灯外部调用控制接口
 * parameter  :无
 * return	  :无
 * caller	  :外部调用
 *-----------------------------------------------------------------------------*/
void led_breath(void *pvParameters)
{
	int i = 0;
	
	for(;;)
	{		
		myprintf("led task\n\r");
		vTaskDelay(1000/portTICK_RATE_MS);

		if(i % 5 == 0)
		{
			EXTI_GenerateSWInterrupt(EXTI_Line2);
		}
		i++;	
	}
}

3、stm32f10x_it.c里添加中断处理函数，运行EXTI_GenerateSWInterrupt(EXTI_Line2)后立即进入中断。

extern void myprintf(char *Data,...);
void EXTI2_IRQHandler(void)
{
	if(EXTI_GetITStatus( EXTI_Line2) != RESET)
	{
		EXTI_ClearFlag(EXTI_Line2);    //清除中断标志位
		EXTI_ClearITPendingBit(EXTI_Line2); //清除EXTI线路挂起位
		myprintf("SWInterrupt in\n\r");
	}
}

4、main()函数

#include "FreeRTOS.h"
#include "task.h"
#include "queue.h"
#include "stm32f10x.h"
#include "exit.h"
#include "delay.h"
#include "led.h"
#include "lcd.h"
#include "uart.h"

//static const char *pcTextForTask1 = "Task 1 is running\r\n";
//static const char *pcTextForTask2 = "Task 2 is running\r\n";

//如果不加强制转换(signed  char*)，编译器GCC 会报错
const signed char * const Ledtask = 	(signed  char*)"led task"; 
const signed char * const Lcdtask =	(signed  char*)"lcd task"; 

//const signed char * const task2 = "Task 1\n";
//const signed char * const task3 = "Task 2\n";
//xSemaphoreHandle xBinarySemaphore;

void reset(void)
{
	ExitConfig();
	USART1_Config();
	delay_init();
	led_init();
	LcdInit();
}	

int main(void)
{  	
	reset();

	//创建信号量
//	vSemaphoreCreateBinary(xBinarySemaphore);

	//
	
	xTaskCreate(led_breath, Ledtask, configMINIMAL_STACK_SIZE, NULL, 1, NULL);		
	xTaskCreate(LcdTask, Lcdtask, configMINIMAL_STACK_SIZE, NULL, 1, NULL);
	vTaskStartScheduler();	
}

STM32开发记录一： 外部中断之软中断SWI使用

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