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2018年04月13日 | STM8S---外部中断应用之长按键识别

2018-04-13 来源：eefocus

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

/* BASIC INTERRUPT VECTOR TABLE FOR STM8 devices

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。

/*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：12

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_CR1：12

配置促发方式；

#include

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 */

STM8S 外部中断长按键识别

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