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用定时器PWM输出

配置定时器

void TIME5_config(void)

{

TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStruct;//时基结构体

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM5, ENABLE);//使能时钟

TIM_TimeBaseInitStruct.TIM_Prescaler = 90-1;      //分频系数

TIM_TimeBaseInitStruct.TIM_Period    = 100 -1;    //范围：1-65535配置ARR

TIM_TimeBaseInitStruct.TIM_CounterMode = TIM_CounterMode_Up; //上拉

TIM_TimeBaseInitStruct.TIM_ClockDivision  = TIM_CKD_DIV1;

TIM_TimeBaseInit(TIM5, &TIM_TimeBaseInitStruct);//初始化

}

配置通道

void TIME5_OC1_config(void)

{

TIM_OCInitTypeDef  TIM_OCInitStruct;//通道结构体

TIM_OCInitStruct.TIM_OCMode = TIM_OCMode_PWM1;//CCR前部有效

TIM_OCInitStruct.TIM_OutputState = TIM_OutputState_Enable;//输出使能

TIM_OCInitStruct.TIM_OCNPolarity = TIM_OCPolarity_Low;//输出低有效

TIM_OCInitStruct.TIM_Pulse      = 0;//初始CCR的数值

TIM_OC1Init(TIM5, &TIM_OCInitStruct);//初始化通道

TIM_Cmd(TIM5, ENABLE);//使能整个时钟

}