改变占空比不能调节步进电机速度

1061700625 · 发表于 2017-8-2 08:52:25

改变占空比不能调节步进电机速度，
另外，
有必要开启更新中断吗？

void PWM_Init(void)
{

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3,ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE);

GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
GPIO_InitStructure.GPIO_Mode=GPIO_Mode_AF_PP;//复用推挽输出
GPIO_InitStructure.GPIO_Pin=GPIO_Pin_6;
GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;
GPIO_Init(GPIOA,&GPIO_InitStructure);

GPIO_InitStructure.GPIO_Mode=GPIO_Mode_AF_PP;//复用推挽输出
GPIO_InitStructure.GPIO_Pin=GPIO_Pin_7;
GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;
GPIO_Init(GPIOA,&GPIO_InitStructure);

TIM_TimeBaseStructure.TIM_ClockDivision=0;//系统时钟不分频
TIM_TimeBaseStructure.TIM_CounterMode=TIM_CounterMode_Up;//向上计数
TIM_TimeBaseStructure.TIM_Period=4999; //装载值
TIM_TimeBaseStructure.TIM_Prescaler=29;//分频系数
TIM_TimeBaseInit(TIM3,&TIM_TimeBaseStructure);

TIM_OCInitStructure.TIM_OCMode=TIM_OCMode_PWM1;//PWM1模式
TIM_OCInitStructure.TIM_OCPolarity=TIM_OCPolarity_High;//输出极性高
TIM_OCInitStructure.TIM_OutputState=TIM_OutputState_Enable;//使能
TIM_OCInitStructure.TIM_Pulse=3600;//比较值
TIM_OC1Init(TIM3,&TIM_OCInitStructure);
TIM_OC2Init(TIM3,&TIM_OCInitStructure);

TIM_ITConfig(TIM3,TIM_IT_Update,ENABLE);

TIM_OC1PreloadConfig(TIM3,TIM_OCPreload_Enable);//使能
TIM_OC2PreloadConfig(TIM3,TIM_OCPreload_Enable);//使能
TIM_ARRPreloadConfig(TIM3, ENABLE);
TIM_Cmd(TIM3,ENABLE);//使能
}

int main(void)
{
PWM_Init();//PWM初始化
delay_init();//延时初始化
while（1）；
}