c语言1hz脉冲,STM32 如何实现1HZ频率 1us脉宽 PWM

[mw_shl_code=c,true]void TIM1_Init(uint16_t period, uint16_t prescaler)

{

TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;

NVIC_InitTypeDef NVIC_InitStructure;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE); //ê±Öóê1Äü

//¶¨ê±Æ÷TIM43õê¼»ˉ

TIM_TimeBaseStructure.TIM_Period = period; //éèÖÃÔúÏÂò»¸ö¸üDÂê¼t×°èë»î¶ˉμÄ×Ô¶ˉÖØ×°ÔؼÄ′æÆ÷ÖüÆúμÄÖμ

TIM_TimeBaseStructure.TIM_Prescaler = prescaler; //éèÖÃóÃà′×÷ÎaTIMxê±ÖóÆμÂê3yêyμÄÔ¤·ÖÆμÖμ

TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1; //éèÖÃê±Öó·Ö¸î:TDTS = Tck_tim

TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //TIMÏòéϼÆêyÄ￡ê½

TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure); //¸ù¾YÖ¸¶¨μÄ2Îêy3õê¼»ˉTIMxμÄê±¼ä»ùêyμ￥λ

TIM_ITConfig(TIM1,TIM_IT_Update,ENABLE ); //ê1ÄüÖ¸¶¨μÄTIM4ÖD¶Ï,ÔêDí¸üDÂÖD¶Ï

//ÖD¶ÏóÅÏ輶NVICéèÖÃ

NVIC_InitStructure.NVIC_IRQChannel = TIM1_UP_IRQn; //TIM1ÖD¶Ï

NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 3; //ÏèÕ¼óÅÏ輶3¼¶

NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3; //′óóÅÏ輶3¼¶

NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQí¨μà±»ê1Äü

NVIC_Init(&NVIC_InitStructure); //3õê¼»ˉNVIC¼Ä′æÆ÷

TIM_Cmd(TIM1, ENABLE); //ê1ÄüTIMx

}

void TIM1_UP_IRQHandler(void)

{

static long a;

if(TIM_GetITStatus(TIM1, TIM_IT_Update))

{

a++;

if(a == 1000000)

a=0;

if(a

led=1;

else

led=0;

TIM_ClearITPendingBit(TIM1, TIM_IT_Update); //Çå3yTIMx¸üDÂÖD¶Ï±êÖ¾

}

}

void main(void)

{

TIM1_Init(49999,1439);

led_init();

while(1);

}[/mw_shl_code]

用定时器模拟PWM，1us中断一次；改b值就可以控制占空比。

[mw_shl_code=c,true]void TIM1_Init(uint16_t period, uint16_t prescaler) { TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure; NVIC_InitTypeDef NVIC_InitStructure; RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE); //ê±Öóê1Äü //¶¨ê±Æ÷TIM43õê¼»ˉ TIM_TimeBaseStructure.TIM_Period = period; //éèÖÃÔúÏÂò»¸ö¸üDÂê¼t×°èë»î¶ˉμÄ×Ô¶ˉÖØ×°ÔؼÄ′æÆ÷ÖüÆúμÄÖμ TIM_TimeBaseStructure.TIM_Prescaler = prescaler; //éèÖÃóÃà′×÷ÎaTIMxê±ÖóÆμÂê3yêyμÄÔ¤·ÖÆμÖμ TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1; //éèÖÃê±Öó·Ö¸î:TDTS = Tck_tim TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //TIMÏòéϼÆêyÄ￡ê½ TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure); //¸ù¾YÖ¸¶¨μÄ2Îêy3õê¼»ˉTIMxμÄê±¼ä»ùêyμ￥λ TIM_ITConfig(TIM1,TIM_IT_Update,ENABLE ); //ê1ÄüÖ¸¶¨μÄTIM4ÖD¶Ï,ÔêDí¸üDÂÖD¶Ï //ÖD¶ÏóÅÏ輶NVICéèÖà NVIC_InitStructure.NVIC_IRQChannel = TIM1_UP_IRQn; //TIM1ÖD¶Ï NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 3; //ÏèÕ¼óÅÏ輶3¼¶ NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3; //′óóÅÏ輶3¼¶ NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQí¨μà±»ê1Äü NVIC_Init(&NVIC_InitStructure); //3õê¼»ˉNVIC¼Ä′æÆ÷ TIM_Cmd(TIM1, ENABLE); //ê1ÄüTIMx } void TIM1_UP_IRQHandler(void) { static long a; if(TIM_GetITStatus(TIM1, TIM_IT_Update)) { a++; if(a == 1000000) a=0; if(a led=1; else led=0; TIM_ClearITPendingBit(TIM1, TIM_IT_Update); //Çå3yTIMx¸üDÂÖD¶Ï±êÖ¾ } } void main(void) { TIM1_Init(49999,1439); led_init(); while(1); }[/mw_shl_code] 用定时器模拟PWM，1us中断一次；改b值就可以控制占空比。