定时器是10mS中断,长时间搁置后,timer变成了200uS的更新中断 相关代码如下: void sysclk_init(void) { //主时钟选择 { CLK_SWR = 0xE1; //内部16MHSI为主时钟源 CLK_ICKR |= 0x05; //从halt模式唤醒使能、使能HSI时钟 while((CLK_ICKR & 0x02) == 0x00); //等待HSI稳定就绪 } //16MRC时钟1:2输出 即Fmaster = Fhsi / 2 (00-1:1 01-1:2 10-1:4 11-1:8) { CLK_CKDIVR &= ~(1 << 4); CLK_CKDIVR |= (1 << 3); } //Fcpu = Fmaster = 8M 这个才是真正的供CPU使用的时钟 CLK_CKDIVR &= ~((1 << 2) | (1 << 1) | (1 << 0)); //Fcpu = Fmaster / 2 = 4M CLK_CKDIVR |= (1 << 0); // CLK_CKDIVR = 0x00; //16MHz主频 CLK_PCKENR1 = 0x00; //关闭所有外设时钟 CLK_PCKENR2 = 0x00; } void awu_init(void) { CLK_PCKENR2 |= (1 << 2); //使能AWU时钟 //唤醒时间2.00S AWU_TBR = 0x0D; AWU_APR = 0x3E; //分频Fls AWU_CSR1 |= 0x10; //AWU使能 CLK_ICKR |= (1 << 5); //活跃停机模式(AWU使能情况)下,关闭电压调节器节省功耗 FLASH_CR1 |= (1 << 2); //活跃停机模式下Flash掉电,默认只有停机模式才掉电,代价是唤醒时间增加至微秒级别 } void tim1_init(void) { CLK_PCKENR1 |= (1 << 7); //定时器时钟fck_cnt = Fck_psc / ( PSCR[15:0]+1); Fck_psc = Fmaster = 8M //fck_cnt = 8M / (799 + 1) = 10KHz 周期100us TIM1_PSCRH = 0x03; TIM1_PSCRL = 0x1F; //(fCK_CNT)等于fCK_PSC/( PSCR[15:0]+1)。 // TIM1_CNTR寄存器计数到0x0064(100)为一次溢出:10ms TIM1_ARRH = 0x00; TIM1_ARRL = 0x64; TIM1_IER = 0x01; //允许更新中断 //重复计数寄存器复位值为0,溢出一次即产生中断 // TIM1_RCR = 50; //重复计数寄存器值,这样timer1 2次50ms即100ms产生一次中断 TIM1_CR1 = 0x01; } void main(void) { sysclk_init(); adc_init(); timer1_init(); awu_init(); while(1) { //关ADC ADC_CR1 &= ~(1 << 0); //关timer TIM1_CR1 &= ~0x01; CLK_PCKENR1 &= ~(1 << 7); asm("halt"); //进入睡眠模式 asm("nop"); asm("nop"); enter_int(); //关全局中断 CLK_PCKENR2 |= (1 << 3); ADC_CR1 &= ~(1 << 0); Delay_ms(10); ADC_CR1 |= (1 << 0); CLK_PCKENR1 |= (1 << 7); TIM1_SR1 &= ~0x01;//清除中断标志 TIM1_CR1 = 0x01; exit_int(); //开全局中断 } } |
没用过,帮顶,你看看你的板子支持几种低功耗模式?有些板子的systick只支持sleep模式唤醒
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