【求助】求助，程序上的问题

clio4177

【求助】求助，程序上的问题 [复制链接]

/*目的是按下按键则蜂鸣器就发出声音，电路板是msp430F169的学习板*/
#include <msp430x16x.h>
#define NO_KEY 0 //没有案按键
#define KEY_K1 1 //按键1
#define KEY_K2 2 //按键2
#define KEY_K3 3 //按键3
#define STEP_IDEL 0 //按键延时
#define STEP_DELAY 1 //等待按键
#define STEP_FINISH 2 //按键过程结束
#define TRUE 1
unsigned int wDelay = 0;
unsigned char nKey = NO_KEY;
/*void init_BT(void)
{
BTCTL = 0x06;
IE2 |= 0x80;
}*/
unsigned char GetKey(void)
{
static unsigned char nStep = STEP_IDEL;
static unsigned char nBufferedKey;
switch(nStep)
{
case STEP_DELAY: //按键消抖
if(wDelay > 4)
{ wDelay = 0;
nStep = STEP_FINISH;
}
else
nBufferedKey = NO_KEY;
break;
case STEP_FINISH: //按键完成
if(((P1IN & 0x04) == 0 )&& (nBufferedKey == KEY_K1))
nKey = KEY_K1;
else if(((P1IN & 0x08) == 0)&& (nBufferedKey == KEY_K2))
nKey = KEY_K2;
else if(((P1IN &0x10) == 0) &&(nBufferedKey ==KEY_K3))
{ nKey = KEY_K3;
nStep = STEP_IDEL;
}
break;
case STEP_IDEL: //按键检测
if ((P1IN & 0x04) == 0)
{
nBufferedKey = KEY_K1;//当按P1.2时为低电平
wDelay = 0;
nStep = STEP_DELAY;
}
else if((P1IN &0x08) == 0)//当按P1.3时为低电平
{
nBufferedKey = KEY_K2;
wDelay = 0;
nStep = STEP_DELAY;
}
else if((P1IN & 0x10) == 0)//当按P1.4时为低电平
{
nBufferedKey = KEY_K3;
wDelay = 0;
nStep = STEP_DELAY;
}
break;
default:
break;
}
return nBufferedKey;
}
void main(void)
{
WDTCTL = WDTPW + WDTHOLD;//关闭看门狗
TACTL = TASSEL1 + TACLR ;//时钟源SMCLK，清除TAR
// init_BT();
CCTL0 = CCIE;//CCR0中断使能
CCR0 = 50000;//产生3.2ms的定时
TACTL |= MC1;//Timer_a增计数模式
wDelay = 0;
_EINT();//使能系统中断
while (TRUE)
{
nKey = GetKey();
switch (nKey)
{
case NO_KEY:
break;
case KEY_K1://按P1.2时
P4DIR |= 0x0c;
P4OUT |= 0x04;
nKey= NO_KEY;
break;
case KEY_K2://按P1.3时
P4DIR |= 0x0c;
P4OUT |= 0x08;
nKey= NO_KEY;
break;
case KEY_K3://按P1.4时
nKey = NO_KEY;
break;
}
}
}
#pragma vector = TIMERA0_VECTOR
__interrupt void Timer_A( void)
{
wDelay++;
CCR0 += 50000;
}
/*#pragma vector = BASICTIMER_VECTOR
__interrupt void BT_Interrrupt(void)
{
wDelay++;
CCR0 += 50000;
}*/
/*interrupt [TIMERA0_VECTOR]void Timer_a_interrupt(void)//Timer_a_0中断
{
wDelay++;
CCR0 += 50000;
}*/
这是自己弄一个小程序，怎么好像进不了中断啊，按键也没有什么响应，劳烦大虾们给看看啊～～～～

kakalin

由于硬件原因，如果想发出声音，中断程序如下写
#pragma vector = TIMERA0_VECTOR
__interrupt void Timer_A( void)
{
wDelay++;
nKey = GetKey();
switch (nKey)
{
case NO_KEY:
break;
case KEY_K1:
P4DIR |= 0x0c;
P4OUT ^= 0x04;
nKey= NO_KEY;
break;
case KEY_K2:
P4DIR |= 0x0c;
P4OUT ^= 0x08;
nKey= NO_KEY;
break;
case KEY_K3:
nKey = NO_KEY;
break;
}
}
同时将主程序中重复的语句去掉。

我也是初学，还请老兄多多指教。

ccxida

/*目的是按下按键则蜂鸣器就发出声音，电路板是msp430F169的学习板*/
#include <msp430x44x.h>
#define NO_KEY 0 //没有按键
#define KEY_K1 1 //按键1
#define KEY_K2 2 //按键2
#define KEY_K3 3 //按键3
#define STEP_IDEL 0 //按键延时
#define STEP_DELAY 1 //等待按键
#define STEP_FINISH 2 //按键过程结束
#define TRUE 1
unsigned int wDelay = 0;
unsigned char nKey = NO_KEY;
unsigned char GetKey(void)
{
static unsigned char nStep = STEP_IDEL;
static unsigned char nBufferedKey;
switch(nStep)
{
case STEP_DELAY: //按键消抖
if(wDelay > 4)
wDelay = 0;
nStep = STEP_FINISH;
break;
case STEP_FINISH: //按键完成
if(((P1IN & 0x04) == 0 )&& (nBufferedKey == KEY_K1))
nKey = KEY_K1;
else if(((P1IN & 0x08) == 0)&& (nBufferedKey == KEY_K2))
nKey = KEY_K2;
else if(((P1IN &0x10) == 0) &&(nBufferedKey ==KEY_K3))
nKey = KEY_K3;
else
nKey = NO_KEY;
nStep = STEP_IDEL;
break;
case STEP_IDEL: //按键检测
if ((P1IN & 0x04) == 0)
{
nBufferedKey = KEY_K1;
nKey = NO_KEY;
//wDelay = 0;
nStep = STEP_DELAY;
}
else if((P1IN & 0x08) == 0)
{
nBufferedKey = KEY_K2;
nKey = NO_KEY;
//wDelay = 0;
nStep = STEP_DELAY;
}
else if((P1IN & 0x10) == 0)
{
nBufferedKey = KEY_K3;
nKey = NO_KEY;
//wDelay = 0;
nStep = STEP_DELAY;
}
else
nKey = NO_KEY;
break;
}
return nBufferedKey;
}
void main(void)
{
WDTCTL = WDTPW + WDTHOLD;//关闭看门狗
TACTL = TASSEL1 + TACLR ;//时钟源SMCLK，清除TAR
CCTL0 = CCIE;//CCR0中断使能
CCR0 = 50000;//产生3.2ms的定时
TACTL |= MC1;//Timer_a增计数模式
_EINT();//使能系统中断
while (TRUE)
{
nKey = GetKey();
switch (nKey)
{
case NO_KEY:
P4DIR |=0xff;
P4OUT |= 0x00;
break;
case KEY_K1://S1
P4DIR |= 0xff;//P4.2,P4.3输出
P4OUT ^= 0x08;//输出为交流
nKey= NO_KEY;
break;
case KEY_K2://S2
P4DIR |= 0xff;//P4.2,P4.3输出
P4OUT ^= 0x04;//输出为交流
nKey= NO_KEY;
break;
case KEY_K3://S3
nKey = NO_KEY;
break;
}
}
}
/*#pragma vector = TIMERA0_VECTOR
__interrupt void Timer_A( void)
{
wDelay++;
CCR0 += 50000;
}*/
interrupt [TIMERA0_VECTOR]void Timer_a_interrupt(void)//Timer_a_0中断
{
wDelay++;
CCR0 += 50000;
}
谢谢上面的老兄，把程序该成上面这个是可以了，但是现在出现的现象上：当按键按下后蜂鸣器开始发声，松开后继续发声，知道按其他键后才停止。以我的原来的本意是按下发声，抬起按键就不发声，原因出在哪了啊？

kjxxbjb

本人愚见：因为nKey为全局变量，只要有不等于 NO_KEY，就会发音，而不再于是否是按下还是弹起，如果要实现你的想法，我认为要用到 捕捉功能，捕捉到下降沿时，输出交流电压，当捕捉到上升沿时，停止输出。

BLADE

引用:

本人愚见：因为nKey为全局变量，只要有不等于 NO_KEY，就会发音，而不再于是否是按下还是弹起，如果要实现你的想法，我认为要用到 捕捉功能，捕捉到下降沿时，输出交流电压，当捕捉到上升沿时，停止输出。

确实是nKey这有问题了，谢谢楼上的。
/*目的是按下按键则蜂鸣器就发出声音，电路板是msp430F169的学习板*/
#include <msp430x44x.h>
#define NO_KEY 0 //没有按键
#define KEY_K1 1 //按键1
#define KEY_K2 2 //按键2
#define KEY_K3 3 //按键3
#define STEP_IDEL 0 //按键延时
#define STEP_DELAY 1 //等待按键
#define STEP_FINISH 2 //按键过程结束
#define TRUE 1
unsigned int wDelay = 0;
unsigned char nKey = NO_KEY;
unsigned char GetKey(void)
{
static unsigned char nStep = STEP_IDEL;
static unsigned char nBufferedKey;
static unsigned char nPressKey;/////////////////////////////////这个是后来修改完的
switch(nStep)
{
case STEP_IDEL: //按键检测
if ((P1IN & 0x04) == 0)//K3
{
nBufferedKey = KEY_K1;
// nKey = NO_KEY;
//wDelay = 0;
nStep = STEP_DELAY;
}
else if((P1IN & 0x08) == 0)//K2
{
nBufferedKey = KEY_K2;
// nKey = NO_KEY;
//wDelay = 0;
nStep = STEP_DELAY;
}
else if((P1IN & 0x10) == 0)//K1
{
nBufferedKey = KEY_K3;
//nKey = NO_KEY;
//wDelay = 0;
nStep = STEP_DELAY;
}
else
{ nBufferedKey = NO_KEY;
}
nPressKey = NO_KEY;/////////////////////////
break;
case STEP_DELAY: //按键消抖
if(wDelay > 4)
{ wDelay = 0;
nStep = STEP_FINISH;
}
nPressKey = NO_KEY;//////////////////////////////
break;
case STEP_FINISH: //按键完成
if(((P1IN & 0x04) == 0 )&& (nBufferedKey == KEY_K1))
nBufferedKey = KEY_K1;
else if(((P1IN & 0x08) == 0)&& (nBufferedKey == KEY_K2))
nBufferedKey = KEY_K2;
else if(((P1IN &0x10) == 0) &&(nBufferedKey ==KEY_K3))
nBufferedKey = KEY_K3;
else
{ nBufferedKey = NO_KEY;
}
nStep = STEP_IDEL;
nPressKey = nBufferedKey;/////////////////////////////
break;
}
return nPressKey;/////////////////////////////////////////////////////////////////
}
void main(void)
{
WDTCTL = WDTPW + WDTHOLD;//关闭看门狗
TACTL = TASSEL1 + TACLR ;//时钟源SMCLK，清除TAR
CCTL0 = CCIE;//CCR0中断使能
CCR0 = 50;//产生3.2ms的定时
TACTL |= MC1;//Timer_a增计数模式
_EINT();//使能系统中断
while (TRUE)
{
nKey = GetKey();
switch (nKey)
{

case KEY_K1://S3
nKey= NO_KEY;
P4DIR |= 0xff;//P4.2,P4.3输出
P4OUT ^= 0x08;//输出为p4.2高电平，p4.3低电平
break;
case KEY_K2://S2
nKey= NO_KEY;
P3DIR |= 0xff;
P3OUT ^= 0x04;
P4DIR |= 0xff;//P4.2,P4.3输出
P4OUT ^= 0x04;//输出为p4.3高电平，p4.2低电平
break;
case KEY_K3://S1
nKey = NO_KEY;
P4DIR |= 0xff;
P4OUT |= 0x00;
break;
case NO_KEY:
P4DIR |= 0xff;
P4OUT |= 0x00;
break;
}
}
}
/*#pragma vector = TIMERA0_VECTOR
__interrupt void Timer_A( void)
{
wDelay++;
CCR0 += 50000;
}*/
interrupt [TIMERA0_VECTOR]void Timer_a_interrupt(void)//Timer_a_0中断
{
wDelay++;
CCR0 += 50;
}