TI中文支持网各位老师，前辈好，我想请问一下，我现在用的是MSP430F5529，我现在想要实现的功能是不断采样电压值，根据电压值输出不同占空比的PWM波，但是由于输出pwm我学例程时都是最后让CPU处于低功耗模式，无法进行第二次采样，请问有什么办法吗.谢谢，（我将__bis_SR_register(LPM0_bits); 删去时，示波器上就无法显示pwm波）
unsigned int myvolt,peried_on;
int main(void)
{
int main(void)
{
WDTCTL = WDTPW | WDTHOLD; // Stop watchdog timer
P6SEL|= 0x01;
REFCTL0 &= ~REFMSTR;
ADC12CTL0 = ADC12ON+ ADC12SHT0_8+ADC12REFON+ADC12REF2_5V;
ADC12CTL1 = ADC12SHP+ ADC12CONSEQ_2;
ADC12MCTL0 = ADC12SREF_1+ADC12INCH_0;
__delay_cycles(100);
ADC12CTL0 |= ADC12ENC;
while(1)
{
ADC12CTL0 |= ADC12SC; // Start convn – software trigger
myvolt=ADC12MEM0；
peried_on=PID_volt(myvolt);
Input_PWM();
}
P6SEL|= 0x01;
REFCTL0 &= ~REFMSTR;
ADC12CTL0 = ADC12ON+ ADC12SHT0_8+ADC12REFON+ADC12REF2_5V;
ADC12CTL1 = ADC12SHP+ ADC12CONSEQ_2;
ADC12MCTL0 = ADC12SREF_1+ADC12INCH_0;
__delay_cycles(100);
ADC12CTL0 |= ADC12ENC;
while(1)
{
ADC12CTL0 |= ADC12SC; // Start convn – software trigger
myvolt=ADC12MEM0；
peried_on=PID_volt(myvolt);
Input_PWM();
}
}
void Input_PWM(unsigned int peried_on)
{
P2DIR |= BIT0; // P2.0 and P2.1 output
P2SEL |= BIT0; // P2.0 and P2.1 options select
TA1CCR0 = 540; // PWM Period
TA1CCTL1 = OUTMOD_7; // CCR1 reset/set
TA1CCR1 =peried_on ;
TA1CTL = TASSEL_2 + MC_1 + TACLR;
P1DIR|=0X01;
TA0CCTL0=CCIE;
TA0CCR0=5;
TA0CTL=TASSEL_2+ MC_3 + TACLR;
__bis_SR_register(LPM0_bits); // Enter LPM0
{
P2DIR |= BIT0; // P2.0 and P2.1 output
P2SEL |= BIT0; // P2.0 and P2.1 options select
TA1CCR0 = 540; // PWM Period
TA1CCTL1 = OUTMOD_7; // CCR1 reset/set
TA1CCR1 =peried_on ;
TA1CTL = TASSEL_2 + MC_1 + TACLR;
P1DIR|=0X01;
TA0CCTL0=CCIE;
TA0CCR0=5;
TA0CTL=TASSEL_2+ MC_3 + TACLR;
__bis_SR_register(LPM0_bits); // Enter LPM0
}
user6025056：
不好意思，主函数中最后一行是Input_PWM(peried_on);
Susan Yang：
您可以将Input_PWM内的__bis_SR_register(LPM0_bits);// Enter LPM0 这一句移到main函数内
让其在结束所有的采样后才进入LPM0
