高级定时器TIM8输出PWM，改变频率后PWM的占空比设置后芯片输出这个占空比会延迟怎么解决。

18359164829 · 发表于 2015-5-4 15:22:10

如题

正点原子 · 发表于 2015-5-4 15:22:11

禁止ARR预装载即可。

18359164829 · 发表于 2015-5-4 15:40:12

求大神告诉在主程序中如何设置频率，不会引起上述问题.

18359164829 · 发表于 2015-5-4 16:24:51

可以这样写吗？
void LED_Frequency_SET(u8 num)
{
static u8

WM_Flag=0;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
if(PWM_Flag!=num)
{
PWM_Flag=num;
if((num>99)&(num<201))
{

TIM_TimeBaseStructure.TIM_Period = 30927-(18*(PWM_Flag-100)); //?è???????????ü??????×°????????×?????×°???????÷????????
TIM_TimeBaseStructure.TIM_Prescaler = 3; //?è??????×÷??TIMx?±?????????????¤·?????
TIM_TimeBaseStructure.TIM_ClockDivision = 0; //?è???±??·???:TDTS = Tck_tim
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Down; //TIM?ò??????????
TIM_TimeBaseInit(TIM8, &TIM_TimeBaseStructure); //?ù??TIM_TimeBaseInitStruct?????¨????????????TIMx???±???ù??????

}
}

}