STM32通用定时器实现频率占空比可调互补PWM输出

/** ****************************************************************************** * @file : complementaryPWM.c * @author : wind * @version: * @date : 2015,04,01 * @brief : ****************************************************************************** */ /* ---------------------------------------------------------------------------*/ #include "stm32f30x.h" #include "stm32f30x_tim.h" #include "stm32f30x_gpio.h" void PWMoutput(void); int main() { SystemInit(); PWMoutput(); while(1); } void PWMoutput(void) { uint16_t period=0,pulsewidth=0; GPIO_InitTypeDef GPIO_InitStruct; TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStruct; TIM_OCInitTypeDef TIM_OCInitStruct; period = 72*1000000/(100*1000);//计数周期，系统频率72M，PWM输出频率100k pulsewidth = 45*period/100; //脉宽，占空比45% RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA,ENABLE); RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE); //GPIO Init GPIO_InitStruct.GPIO_Pin = (GPIO_Pin_6 | GPIO_Pin_7); GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF; GPIO_InitStruct.GPIO_OType = GPIO_OType_PP; GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz; GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_NOPULL; GPIO_Init(GPIOA, &GPIO_InitStruct); GPIO_PinAFConfig(GPIOA, GPIO_PinSource6, GPIO_AF_2);//PA6->TIM3_CH1 GPIO_PinAFConfig(GPIOA, GPIO_PinSource7, GPIO_AF_2);//PA7->TIM2_CH2 //Timer Base Init TIM_TimeBaseInitStruct.TIM_Prescaler = 0; TIM_TimeBaseInitStruct.TIM_CounterMode = TIM_CounterMode_Up; TIM_TimeBaseInitStruct.TIM_Period = period - 1; //ARR,调节此参数实现频率可调 TIM_TimeBaseInitStruct.TIM_ClockDivision = TIM_CKD_DIV1 ; TIM_TimeBaseInit(TIM3, & TIM_TimeBaseInitStruct); //OCInit TIM_OCStructInit(&TIM_OCInitStruct); TIM_OCInitStruct.TIM_OCMode = TIM_OCMode_PWM1; TIM_OCInitStruct.TIM_OutputState = TIM_OutputState_Enable; TIM_OCInitStruct.TIM_Pulse = pulsewidth; //CCR1，调节此参数实现占空比可调 TIM_OCInitStruct.TIM_OCPolarity = TIM_OCPolarity_High; //OC1 TIM_OC1Init(TIM3, & TIM_OCInitStruct); TIM_OC1PreloadConfig(TIM3, TIM_OCPreload_Enable); //OC2 方法1 : 修改Mode TIM_OCInitStruct.TIM_OCMode = TIM_OCMode_PWM2; TIM_OCInitStruct.TIM_OCPolarity = TIM_OCPolarity_High; /*********************************** //OC2 方法2 : 修改 Polarity TIM_OCInitStruct.TIM_OCMode = TIM_OCMode_PWM1; TIM_OCInitStruct.TIM_OCPolarity = TIM_OCPolarity_Low; ***********************************/ TIM_OC2Init(TIM3, & TIM_OCInitStruct); TIM_OC2PreloadConfig(TIM2, TIM_OCPreload_Enable); TIM_Cmd(TIM3, ENABLE); }