stm32 基于TIM1定时器的PWM输出

void PWM_TIM1(uint16_t arr,uint16_t psc) { RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE); //定时器TIM1时钟使能 TIM_DeInit(TIM1); //设置在下一个更新事件装入活动的自动重装载寄存器周期的值 TIM_TimeBaseStructure.TIM_Period =arr; //设置用来作为TIMx时钟频率出书的预分频值 TIM_TimeBaseStructure.TIM_Prescaler =psc; //设置时钟分割 TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1; //设置计数模式 TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //初始化参数 TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure); GPIO_PinAFConfig(GPIOA, GPIO_PinSource9, GPIO_AF_2); //TIM1channel2 GPIO_PinAFConfig(GPIOA, GPIO_PinSource10, GPIO_AF_2); //TIM1channel3 RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA,ENABLE); //PA9 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL; GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; GPIO_Init(GPIOA, &GPIO_InitStructure); //PA10 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL; GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; GPIO_Init(GPIOA, &GPIO_InitStructure); //TIM1的channel2 TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1; TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; TIM_OC2Init(TIM1, &TIM_OCInitStructure); //TIM1的channel3 TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2; TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; TIM_OC3Init(TIM1, &TIM_OCInitStructure); TIM_OC2PreloadConfig(TIM1, TIM_OCPreload_Enable); TIM_OC3PreloadConfig(TIM1, TIM_OCPreload_Enable); TIM_Cmd(TIM1, ENABLE); //使能TIM1 } int main() { PWM_TIM1(999,1);//频率为：48MHZ/(999+1)/(1+1)=24KHZ TIM_SetCompare2(TIM1,499); //占空比为50%方波 PWM_TIM1(399,1);//频率为：48MHZ/(399+1)/(1+1)= TIM_SetCompare3(TIM1,199); //占空比为50%方波 }