STM32_TIM3_PWM.rar_STM32 TIM3_STM32 TIM3_stm32pwm_原子开发板_战舰开发板

/********************************** * 文件名 ：main.c * 说明 ：1.产生一个PWM波; * 2.输出频率 = 72MHz/预分频(TIM_Prescaler)/计数周期(TIM_Period) * 完成时间 ：31/07/2012 ************************************/ #include"stm32f10x.h" #include"stm32f10x_tim.h" void Timer3_GPIO_Configuration(void); void Timer3_BASE_Configuration(void); void Timer3_PWM_Configuration(void); int main(void) { RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE); RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3,ENABLE); Timer3_GPIO_Configuration(); Timer3_BASE_Configuration(); Timer3_PWM_Configuration(); } void Timer3_GPIO_Configuration(void) { GPIO_InitTypeDef GPIO_InitStructure_TIMER3PWM_PORTA; GPIO_InitStructure_TIMER3PWM_PORTA.GPIO_Pin = GPIO_Pin_6; GPIO_InitStructure_TIMER3PWM_PORTA.GPIO_Speed = GPIO_Speed_50MHz; GPIO_InitStructure_TIMER3PWM_PORTA.GPIO_Mode = GPIO_Mode_AF_PP; //复用功能的推挽输出,片内、外设功能 GPIO_Init(GPIOA, &GPIO_InitStructure_TIMER3PWM_PORTA); } void Timer3_BASE_Configuration(void) { TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure; TIM_DeInit(TIM3); TIM_InternalClockConfig(TIM3); //TIM_Prescaler:指定用于划分的TIM时钟的分频值。 TIM_TimeBaseStructure.TIM_Prescaler = 72; TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; TIM_TimeBaseStructure.TIM_Period = 50000-1; TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1; TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure); TIM_InternalClockConfig(TIM3); //采用内部时钟给TIM3提供时钟源 } void Timer3_PWM_Configuration(void) { unsigned int T3CH1_DC = 50 ; TIM_OCInitTypeDef TIM_OCInitStructure; TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2; TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; TIM_OCInitStructure.TIM_Pulse = (T3CH1_DC * 50000) / 100; //写比较值(占空比输入) TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; TIM_OC1Init(TIM3, & TIM_OCInitStructure); TIM_ARRPreloadConfig(TIM3, ENABLE); TIM_Cmd(TIM3, ENABLE); }