static void Motor_TIM3_Config(void) { uint16_t period, prescaler; TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure; TIM_OCInitTypeDef TIM_OCInitStructure; RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE); Timer_16bit_Calc(MOTOR_STEP_FREQ, &period, &prescaler); /* Time base configuration */ TIM_TimeBaseStructure.TIM_Period = period; TIM_TimeBaseStructure.TIM_Prescaler = prescaler; //设置预分频 TIM_TimeBaseStructure.TIM_ClockDivision = 0; //设置时钟分频系数 TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //向上计数模式 TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure); TIM_OC1PreloadConfig(TIM3, TIM_OCPreload_Enable); TIM_ARRPreloadConfig(TIM3, ENABLE); TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1; //配置为PWM模式1 TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Disable; TIM_OCInitStructure.TIM_Pulse = (period+1)/2-1; //设置跳变值,当计数器计数到这个值时,电平发生跳变 TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; //当定时器计数值小于CCR1_Val时为高电平 TIM_OC1Init(TIM3, &TIM_OCInitStructure); TIM_ITConfig(TIM3, TIM_IT_CC1, ENABLE); TIM_ITConfig(TIM3, TIM_IT_Update, ENABLE); }
/* * 初始化PWM模块,设定脉冲频率(Hz) */ void PWM_Init(int freq) { uint16_t period, prescaler; Timer_16bit_Calc(freq, &period, &prescaler); TIMx_Config(TIM2, period, prescaler); currentPeriod = period; for(int i=1; i<=4; i++) PWM_Channel(i, 50, false); TIMx_Enable(TIM2); // TIM2_SetInterrupt(); }