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[MSP430launch pad]中断中全局变量莫名其妙被改变
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本帖最后由 魔方奇才 于 2014-7-22 18:35 编辑
/*
* ======== ADC10 Interrupt Service Routine ========
*/
#pragma vector=ADC10_VECTOR
__interrupt void ADC10_ISR_HOOK(void)
{
unsigned int temp;
float Rpt,T;
unsigned char i;
ADC10CTL0 &= ~ADC10IFG;
temp = ADC10MEM;
Rpt = (0.02659*temp+95.2381)/(0.9524-temp*1.3297*0.00001); //参考电压为2.5V时的转换公式
T = (sqrt(0.39083*0.39083+0.000231*(100-Rpt))-0.39083)/(-0.0001155);
i=T;
LCD_pos(6,1);
write_num( i ); //温度显示
i = T*10;
i %= 10;
write_string(".");
write_data(0x30+i);
i=0;
}
我在调试后发现经过ADC10的终端服务程序后，全局变量POINT的值被莫名奇妙的改了，当我注释掉ADC中断服务里面的代码后，正常运行，我怀疑是和math.h的两个函数有关，在此程序中并未涉及到关于POINT的语句，求解问题出在何处，下面是全部的程序代码：
#include
#include
#include"lcd12864.h"
#define START BIT3 //开始
#define STOP BIT4 //停止
#define ADD BIT5 //加一
#define DEC BIT6 //减一
#define SELECT BIT7 //选择
unsigned int T_set;
unsigned char POINT=0,aa;
void Init(void);
void UI(void);
void KEYIE(void);
void BCSINIT(void);
void ADC10INIT(void);
void GPIOINIT(void);
void TIMERINIT(void);
void SYSTEMINIT(void);
void WDTINIT(void);
int main(void)
{
Init();
while(1)
{
ADC10CTL0 |= ADC10SC;
delay_ms(1000);
aa=POINT;
}
}
void Init()
{
WDTINIT();
GPIOINIT();
BCSINIT();
ADC10INIT();
TIMERINIT();
SYSTEMINIT();
LCD_Init();
UI();
KEYIE();
}
void WDTINIT(void)
{
WDTCTL = WDTPW | WDTHOLD;
}
void SYSTEMINIT(void)
{
/* Clear oscillator fault flag with software delay */
do
{
// Clear OSC fault flag
IFG1 &= ~OFIFG;
// 50us delay
__delay_cycles(50);
} while (IFG1 & OFIFG);
__bis_SR_register(GIE);
}
void TIMERINIT(void)
{
TA0CCTL1 = CM_0 | CCIS_0 | OUTMOD_7;
TA0CCR0 = 999;
TA0CCR1 = 499;
TA0CTL = TASSEL_2 | ID_0 | MC_0; //MC_0=刚开始时不打开计时器
}
void GPIOINIT(void)
{
P1OUT = 0;
P1SEL = BIT2;
P1DIR = BIT0 | BIT2 | BIT5 | BIT6 | BIT7;
P1IES = 0;
P1IFG = 0;
P2OUT = BIT3 | BIT4 | BIT5 | BIT6 | BIT7;
P2SEL &= ~(BIT6 | BIT7);
P2DIR = 0;
P2REN = BIT3 | BIT4 | BIT5 | BIT6 | BIT7;
P2IES = BIT3 | BIT4 | BIT5 | BIT6 | BIT7;
P2IFG = 0;
}
void ADC10INIT(void)
{
ADC10CTL0 &= ~ENC;
ADC10CTL0 = ADC10IE | ADC10ON | REFON | REF2_5V | ADC10SHT_3 | SREF_1;
ADC10CTL1 = CONSEQ_0 | ADC10SSEL_1 | ADC10DIV_7 | SHS_0 | INCH_1;
ADC10AE0 = 0x2;
__delay_cycles(30000);
ADC10CTL0 |= ENC;
}
void UI()
{
LCD_write(1,2,"温度的测量与控制");
LCD_flash(1);
write_com(0x01);
LCD_write(1,1,"当前温度：");
LCD_write(1,2,"设置温度：");
LCD_write(1,3,"设置时间：");
LCD_write(7,1,".");
LCD_write(7,1,".");
LCD_write(8,1,"℃");
LCD_write(8,2,"℃");
LCD_write(8,3," s");
//LCD_write(1,4,""); //预留最后一行
}
void KEYIE()
{
//P2IES = 0xf8;
P2IFG = 0;
P2IE = 0XF8; // 开启P2.3~P2.7的按键中断
}
void BCSINIT(void)
{
BCSCTL2 = SELM_0 | DIVM_0 | DIVS_0;
if (CALBC1_1MHZ != 0xFF) {
/* Follow recommended flow. First, clear all DCOx and MODx bits. Then
* apply new RSELx values. Finally, apply new DCOx and MODx bit values.
*/
DCOCTL = 0x00;
BCSCTL1 = CALBC1_1MHZ; /* Set DCO to 1MHz */
DCOCTL = CALDCO_1MHZ;
}
BCSCTL1 |= XT2OFF | DIVA_0;
BCSCTL3 = XT2S_0 | LFXT1S_2 | XCAP_1;
}
/*
* ======== PORT2 Interrupt Service Routine ========
*/
#pragma vector=PORT2_VECTOR
__interrupt void PORT2_ISR_HOOK(void)
{
P2IE &= ~0xf8; //关按键中断
//START键
if(P2IFG&START)
{
delay_ms(5);
if(!(P2IN&START))
{
P1OUT ^= BIT0;
}
}
//STOP键
if(P2IFG&STOP)
{
delay_ms(5);
if(!(P2IN&STOP))
{
__delay_cycles(1);
}
}
//ADD键
if(P2IFG&ADD)
{
delay_ms(5);
if(!(P2IN&ADD))
{
}
}
//DEC键
if(P2IFG&DEC)
{
delay_ms(5);
if(!(P2IN&DEC))
{
}
}
//SELECT键
if(P2IFG&SELECT)
{
delay_ms(5);
if(!(P2IN&SELECT))
{
POINT++;
__delay_cycles(1);
}
}
P2IFG = 0;
P2IE |= 0xf8; //开按键中断
}
/*
* ======== ADC10 Interrupt Service Routine ========
*/
#pragma vector=ADC10_VECTOR
__interrupt void ADC10_ISR_HOOK(void)
{
unsigned int temp;
float Rpt,T;
unsigned char i;
ADC10CTL0 &= ~ADC10IFG;
temp = ADC10MEM;
Rpt = (0.02659*temp+95.2381)/(0.9524-temp*1.3297*0.00001); //参考电压为2.5V时的转换公式
T = (sqrt(0.39083*0.39083+0.000231*(100-Rpt))-0.39083)/(-0.0001155);
i=T;
LCD_pos(6,1);
write_num( i ); //温度显示
i = T*10;
i %= 10;
write_string(".");
write_data(0x30+i);
i=0;
}
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