通过PWM控制电机

z728843414

按照例程写的代码

[mw_shl_code=c,true]初始函数[/mw_shl_code] [mw_shl_code=c,true]void TIM3_PWM_Init(u16 arr,u16 psc) { RCC->APB1ENR |= 1<<1; RCC->APB2ENR |= 1<<3; GPIOB->CRL &= 0XFF0FFFFF; GPIOB->CRL |= 0X00B00000; RCC->APB2ENR |= 1<<0;//?????¨?ú?±?? AFIO->MAPR &= 0XFFFFF3FF; AFIO->MAPR |= 1<<11; TIM3->ARR = arr; TIM3->SC = psc; TIM3->CCMR1 |= 7<<12; TIM3->CCMR1 |= 1<<11; TIM3->CCER |= 1<<4; TIM3->CR1 = 0X0080; TIM3->CR1 |= 0X01; }[/mw_shl_code]

[mw_shl_code=c,true]测试代码 TIM3_PWM_Init(899,0); /*LCD_Init(); LCD_Write_Char(0,0,'S'); LCD_Write_Char(1,0,'p'); LCD_Write_Char(2,0,':'); LCD_Write_String(0,1,"sdlen:"); LCD_Write_String(10,1,"good!");*/ while(1) { delay_ms(10); if(dir) led0pwmval ++; else led0pwmval --; if(led0pwmval > 300) dir = 0; if(led0pwmval == 0) dir = 1; LED0_PWM_VAL = led0pwmval; }[/mw_shl_code]

但是我的灯闪的特别厉害。分别把899，和300这两个值改了好多次，也没有看到明显变化。
还有，我是想最终控制直流电机。那么他的pwm频率该是多大，LED0_PWM_VAL变化范围是多少？

正点原子

回复【楼主位】z728843414:
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你想要什么效果？
PWM控制直流电机的转速？
LED0_PWM_VAL的取值范围在0~ARR之间。