如何运用STM32 的一个通用定时器产生频率可调的PWM

Posted 2023-03-25

参考技术A 　　void TIM2_PWM_OUT_Conf(void)
　　
　　RCC->APB1ENR |=1<<0; //TIM2 Clock
　　RCC->APB2ENR |=1<<2; //GPA Clock
　　RCC->APB2ENR |=1<<0; //AFIO Clock
　　RCC->APB2ENR |=1<<3; //GPB Clock
　　RCC->APB1ENR |=7<<0; //TIM2 TIM3 TIM4 Clock
　　GPIOA->CRL &=0xFFFF0000; //
　　GPIOA->CRL |=0x0000BBBB; //AF-Out

　　TIM2->CR1 |=1<<4; //Count Down
　　TIM2->CCMR1 |=6<<4; //OC1M:PWM1
　　TIM2->CCMR1 |=6<<12; //OC2M:PWM1
　　TIM2->CCMR2 |=6<<4; //OC3M:PWM1
　　TIM2->CCMR2 |=6<<12; //OC4M:PWM1

　　// TIM2->CCMR1 |=1<<2;
　　// TIM2->CCMR2 |=1<<10;
　　// TIM2->CCMR1 |=1<<2;
　　// TIM2->CCMR2 |=1<<10;

　　TIM2->CCER |=1<<0; //CC1E ENABLE
　　TIM2->CCER |=1<<4; //CC2E ENABLE
　　TIM2->CCER |=1<<8; //CC3E ENABLE
　　TIM2->CCER |=1<<12; //CC4E ENABLE

　　TIM2->PSC =719; //720-1 PSC
　　TIM2->ARR =PWM_PERIOD; //20ms
　　TIM2->CR1 |=1<<0; //ENABLE

　　
　　//CCR 寄存器修改占空比本回答被提问者采纳 参考技术B stm32f103系列的芯片每个定时器（基本定时器tim6和tim7除外）都有4个通道，每个通道都能产生4路pwm，1路和4路区别不大，你把1路的初始化部分的代码在通道代码的基础上复制另外几个通道的初始化函数就可以了，其余的没有任何区别。