这是我抄的别人的代码
void PWM_Init() { GPIO_InitTypeDef GPIO_InitStructure={0}; TIM_OCInitTypeDef TIM_OCInitStructure={0}; TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStructure={0}; RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOA | RCC_APB2Periph_TIM1 | RCC_APB2Periph_AFIO, ENABLE ); GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_Init( GPIOE, &GPIO_InitStructure ); //配置使用的IO GPIO_PinRemapConfig(GPIO_FullRemap_TIM1, ENABLE); //重映射IO TIM_TimeBaseInitStructure.TIM_Period = 10000; TIM_TimeBaseInitStructure.TIM_Prescaler = 0; TIM_TimeBaseInitStructure.TIM_ClockDivision = TIM_CKD_DIV1; TIM_TimeBaseInitStructure.TIM_CounterMode = TIM_CounterMode_CenterAligned1; TIM_TimeBaseInit( TIM1, &TIM_TimeBaseInitStructure); //配置核心计数器工作模式 TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1; TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; TIM_OCInitStructure.TIM_Pulse = 5000; TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; TIM_OC1Init( TIM1, &TIM_OCInitStructure ); //配置比较输出通道 TIM_CtrlPWMOutputs(TIM1, ENABLE ); //高级定时器置位MOE TIM_OC1PreloadConfig( TIM1, TIM_OCPreload_Disable ); TIM_OC1NPolarityConfig(TIM1, 1); //禁止ccr预装载 TIM_ARRPreloadConfig( TIM1, ENABLE ); //开启核心计数器自动重装载 TIM_Cmd( TIM1, ENABLE ); //开启核心计数器 } int main(void) { // u8g2_t u8g2; SetSysClockTo144_HSE(); led_init(); PWM_Init(); TIM1->CH1CVR = 0; TIM3_PWMOut_Init( 100, 48000-1, 50 ); TIM4_PWMOut_Init( 100, 48000-1, 50 ); TIM5_PWMOut_Init( 100, 48000-1, 50 ); while(1) { led_loop(); } }
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