用TIME0循环读四路风扇转速，是直接用time0来计算脉宽，我是循环开中断来做的，
（TA0CCTL1&= ~CCIE; TA0CCTL2|= CCIE;）-->（TA0CCTL2&= ~CCIE; TA0CCTL3|= CCIE;）......
（TA0CCTL4&= ~CCIE; TA0CCTL1|= CCIE;）
在中断里面关掉自己中断的使能和 TA0CTL|=TACLR;有没有潜在的危险？
char fan_times_tmp = 0; //用来记录次数的中间变量
char fan_flag = 0; //进入中断标志位
#pragma vector=TIMER0_A1_VECTOR
//__interrupt void TIMER0_A1_ISR(void)
__interrupt void TIMER0_A(void)
{
switch(TA0IV)
{
case 0: break; // No interrupt
case 2:
if((TA0CCTL1&CM_2)&&(fan_flag == 0))
{ //清计数器
TA0CTL|=TACLR;
fan_flag = 1;
P3OUT ^= BIT2;
}
else if((TA0CCTL1&CM_2)&&(fan_flag == 1))
{
speed_tmp[fan_times_tmp++] = TA0CCR1;
fan_flag = 0;
if(fan_times_tmp == fan_data_time)
{
fan_a = 0;
for(fan_i=0;fan_i<fan_data_time;fan_i++)
fan_a +=speed_tmp[fan_i];
fan_a >>= 5; //除以4求平均值,以免数据不停跳变
fan_speed[0] = fan_a;
fan_i = 0;
// TA0CCTL1&= ~CCIE;
// TA0CCTL2|= CCIE;
fan_times_tmp = 0;
}
}
TA0CCTL1 &= ~CCIFG; break;
break; // CCR1 not used
case 4:
if((TA0CCTL2&CM_2)&&(fan_flag == 0))
{ //清计数器
TA0CTL|=TACLR;
fan_flag = 1;
}
else if((TA0CCTL2&CM_2)&&(fan_flag == 1))
{
speed_tmp[fan_times_tmp++] = TA0CCR2;
fan_flag = 0;
if(fan_times_tmp == fan_data_time)
{
fan_a = 0;
for(fan_i=0;fan_i<fan_data_time;fan_i++)
fan_a +=speed_tmp[fan_i];
fan_a >>= 5; //除以4求平均值,以免数据不停跳变
fan_speed[0] = fan_a;
fan_i = 0;
TA0CCTL2&= ~CCIE;
TA0CCTL3|= CCIE;
fan_times_tmp = 0;
}
}
TA0CCTL2 &= ~CCIFG;
break;
break; // CCR2 not used
case 6:
if((TA0CCTL3&CM_2)&&(fan_flag == 0))
{ //清计数器
TA0CTL|=TACLR;
fan_flag = 1;
}
else if((TA0CCTL3&CM_2)&&(fan_flag == 1))
{
speed_tmp[fan_times_tmp++] = TA0CCR3;
fan_flag = 0;
if(fan_times_tmp == fan_data_time)
{
fan_a = 0;
for(fan_i=0;fan_i<fan_data_time;fan_i++)
fan_a +=speed_tmp[fan_i];
fan_a >>= 5; //除以4求平均值,以免数据不停跳变
fan_speed[0] = fan_a;
fan_i = 0;
TA0CCTL3&= ~CCIE;
TA0CCTL1|= CCIE;
fan_times_tmp = 0;
}
}
TA0CCTL3 &= ~CCIFG;
break; // reserved
case 8:
if((TA0CCTL4&CM_2)&&(fan_flag == 0))
{ //清计数器
TA0CTL|=TACLR;
fan_flag = 1;
}
else if((TA0CCTL4&CM_2)&&(fan_flag == 1))
{
speed_tmp[fan_times_tmp++] = TA0CCR4;
fan_flag = 0;
if(fan_times_tmp == fan_data_time)
{
fan_a = 0;
for(fan_i=0;fan_i<fan_data_time;fan_i++)
fan_a +=speed_tmp[fan_i];
fan_a >>= 5; //除以4求平均值,以免数据不停跳变
fan_speed[0] = fan_a;
fan_i = 0;
TA0CCTL4&= ~CCIE;
TA0CCTL1|= CCIE;
fan_times_tmp = 0;
}
}
TA0CCTL4 &= ~CCIFG;
break; // reserved
case 10: // reserved
case 12: // reserved
case 14: //TA1CCTL1 &= ~COV; // overflow
break;
default:break;
}
} |
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