STM8S之外部中断应用之长按键识别

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详见博客：http://blog.csdn.net/freeape/article/details/46990181

STM8常用中断指令

  • 开总中断
    • _asm(“rim”);
  • 禁止中断
    • _asm(“sim”);
  • 进入停机模式
    • _asm(“halt”);
  • 中断返回
    • _asm(“iret”);
  • 等待中断
    • _asm(“wfi”);
  • 软件中断
    • _asm(“trap”);

      STM8S常用中断映射

中断映射表

如使用中断函数时，可以通过在上图中查找相对应的中断向量号，而中断函数的名字可以自定义

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/*	BASIC INTERRUPT VECTOR TABLE FOR STM8 devices
 *	Copyright (c) 2007 STMicroelectronics
 */

typedef void @far (*interrupt_handler_t)(void);

struct interrupt_vector {
	unsigned char interrupt_instruction;
	interrupt_handler_t interrupt_handler;
};

@far @interrupt void NonHandledInterrupt (void)
{
	/* in order to detect unexpected events during development, 
	   it is recommended to set a breakpoint on the following instruction
	*/
	return;
}

extern void _stext();     /* startup routine */
extern @far @interrupt void EXTI2_Hand_Fun(void);
extern @far @interrupt void TIM1_UPD_OVF_TRG_BRK_IRQHandler(void);


struct interrupt_vector const _vectab[] = {
	{0x82, (interrupt_handler_t)_stext}, /* reset */
	{0x82, NonHandledInterrupt}, /* trap  */
	{0x82, NonHandledInterrupt}, /* irq0  */
	{0x82, NonHandledInterrupt}, /* irq1  */
	{0x82, NonHandledInterrupt}, /* irq2  */
	{0x82, NonHandledInterrupt}, /* irq3  */
	{0x82, NonHandledInterrupt}, /* irq4  */
	{0x82, EXTI2_Hand_Fun}, /* irq5  */
	{0x82, NonHandledInterrupt}, /* irq6  */
	{0x82, NonHandledInterrupt}, /* irq7  */
	{0x82, NonHandledInterrupt}, /* irq8  */
	{0x82, NonHandledInterrupt}, /* irq9  */
	{0x82, NonHandledInterrupt}, /* irq10 */
	{0x82, TIM1_UPD_OVF_TRG_BRK_IRQHandler}, /* irq11 */
	{0x82, NonHandledInterrupt}, /* irq12 */
	{0x82, NonHandledInterrupt}, /* irq13 */
	{0x82, NonHandledInterrupt}, /* irq14 */
	{0x82, NonHandledInterrupt}, /* irq15 */
	{0x82, NonHandledInterrupt}, /* irq16 */
	{0x82, NonHandledInterrupt}, /* irq17 */
	{0x82, NonHandledInterrupt}, /* irq18 */
	{0x82, NonHandledInterrupt}, /* irq19 */
	{0x82, NonHandledInterrupt}, /* irq20 */
	{0x82, NonHandledInterrupt}, /* irq21 */
	{0x82, NonHandledInterrupt}, /* irq22 */
	{0x82, NonHandledInterrupt}, /* irq23 */
	{0x82, NonHandledInterrupt}, /* irq24 */
	{0x82, NonHandledInterrupt}, /* irq25 */
	{0x82, NonHandledInterrupt}, /* irq26 */
	{0x82, NonHandledInterrupt}, /* irq27 */
	{0x82, NonHandledInterrupt}, /* irq28 */
	{0x82, 


NonHandledInterrupt}, /* irq29 */
};

外部中断长按键识别相关配置

  STM8S为外部中断事件专门分配了五个中断向量：

  • PortA 口的5个引脚：PA[6:2]
  • PortB 口的8个引脚：PB[7:0]
  • PortC 口的8个引脚：PC[7:0]
  • PortD 口的7个引脚：PD[6:0]
  • PortE口的8个引脚：PE[7:0]

  PD7是最高优先级的中断源（TLI）;

中断IO设置

  这里选用EXTI2(端口C外部中断)。那么需要将中断促发的IO（PC5）设置为上拉输入或中断上拉输入，悬浮输入的话很容易受干扰。

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/*PC5设置为上拉输入*/
void Init_EXTI2_GPIO(void)
{
	PC_DDR &= 0XDF; 
	PC_CR1 &= 0XDF;
	PC_CR2 |= 0x20;
}

外部中断寄存器配置

CPU CC寄存器中断位：

  I1 I0不能直接写，只能通过开中断或关中断来写，上电默认是11；当用指令开中断时( _asm(“rim\n”);)，为00；当发生中断时，由当前中断(ITC_SPRx)载入I[1:0]，主要用于做中断优先级；退出中断自动清0；因此在写EXTI_CR1，需将ITC_SPRx配置成11，或加入禁中断指令 。

EXTI_CR1：

  配置促发方式；

测试代码

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#include<stm8s003f3p.h>

char keyFlag;		
char keyPressStatus = 1;
unsigned int keyCount;		

/*Output Pin*/
_Bool PD2 @PD_ODR:2;
_Bool PC7 @PC_ODR:7;
_Bool PC6 @PC_ODR:6;
_Bool PC3 @PC_ODR:3;
/*Input Pin*/
_Bool PC5	@PC_IDR:5;

/*电量指示灯*/
#define LED1 PD2
#define LED2 PC7
#define LED3 PC6
#define LED4 PC3
/*按键*/
#define KEY		PC5


/*主时钟频率为8Mhz*/
void Init_CLK(void)
{
	CLK_ICKR |= 0X01;    		//使能内部高速时钟 HSI
	CLK_CKDIVR = 0x08;			//16M内部RC经2分频后系统时钟为8M
	while(!(CLK_ICKR&0x02));	//HSI准备就绪 
	CLK_SWR=0xE1;           	//HSI为主时钟源 
}

void Init_LED(void)
{
	/*LED 配置为推挽输出*/
	PD_DDR |= 0X04;   //PD2输出模式,0为输入模式
	PD_CR1 |= 0X04;   //PD2模拟开漏输出
	PD_CR2 &= 0XFB;   //PD2输出速度最大为2MHZ，CR1/CR2悬浮输入
 
	PC_DDR |= 0XC8;
	PC_CR1 |= 0XC8;
	PC_CR2 &= 0X27;
}

/*PC5设置为上拉输入*/
void Init_EXTI2_GPIO(void)
{

	PC_DDR &= 0XDF; 
	PC_CR1 &= 0XDF;
	PC_CR2 |= 0X20;
}

void Init_EXTI2(void)
{
	EXTI_CR1 |= 0x30;		//上升沿和下降沿促发
}


void Init_TIM1(void)
{
	TIM1_IER = 0x00;
	TIM1_CR1 = 0x00;

	TIM1_EGR |= 0x01;
	TIM1_PSCRH = 199/256; // 8M系统时钟经预分频f=fck/(PSCR+1) TIM1 为16位分频器 
	TIM1_PSCRL = 199%256; // PSCR=0x1F3F，f=8M/(200)=40000Hz，每个计数周期1/40000ms
	 
	TIM1_CNTRH = 0x00;
	TIM1_CNTRL = 0x00;		
	
	TIM1_ARRH = 400/256;  // 自动重载寄存器ARR=400
	TIM1_ARRL = 400%256;  // 每记数400次产生一次中断，即10ms

	TIM1_CR1 |= 0x81;
	TIM1_IER |= 0x01;
}

unsigned int Key_Scan_Test(void)
{
	unsigned int count = 0;
	unsigned char keyMode;
	
	if(0 == keyPressStatus)
	{
		keyFlag = 1;
		while(!keyPressStatus);
		keyFlag = 0;
		count = keyCount;
		keyCount = 0;
	}
	else
	{
		count = 0;
	}
	/*10ms * 150 = 1.5s*/
	if(count >= 150)keyMode = 2;		//长按
	else if(count >= 4)keyMode = 1;		//短按
	else keyMode = 0;					//抖动
	
	return keyMode;
}

main()
{  
	char keynum = 0;

	_asm("sim");
	Init_CLK();
	Init_LED();
	Init_EXTI2_GPIO();
	Init_EXTI2();
	Init_TIM1();
	_asm("rim");
	while (1)
	{
		keynum = Key_Scan_Test();
		if(1 == keynum)LED3 = ~LED3;
		if(2 == keynum)LED4 = ~LED4;
	}
}

@far @interrupt void EXTI2_Hand_Fun(void)
{
	keyPressStatus = !keyPressStatus;
	LED1 = ~LED1;
}

@far @interrupt void TIM1_UPD_OVF_TRG_BRK_IRQHandler(void)
{
	static unsigned int i = 0;
	
	TIM1_SR1 &= ~(0X01);
	
	++i;
	if(50 == i)
	{
		LED2 = ~LED2;
		i = 0;
	}

	/*Within Key Press Hand*/
	if(1 == keyFlag)
	{
		++keyCount;
	}
}
注意：
中断向量需声明，在stm8_interrupt_vector.c中加入：
extern @far @interrupt void EXTI2_Hand_Fun(void);
extern @far @interrupt void TIM1_UPD_OVF_TRG_BRK_IRQHandler(void);
{0x82, EXTI2_Hand_Fun}, /* irq5  */
{0x82, TIM1_UPD_OVF_TRG_BRK_IRQHandler}, /* irq11 */

  另参见不用外部中断长按键识别：不用外部中断识别长按键