精英版怎么用TIM3 CH1做PWM波实验

zky520me · 发表于 2017-9-26 23:01:32

[mw_shl_code=c,true]#include "pwm.h"
#include "led.h"
void pwm_init(u16 arr,u16 psc)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStrue;
TIM_OCInitTypeDef TIM_OCInitStrue;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3,ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO,ENABLE);

TIM_DeInit(TIM3);
GPIO_PinRemapConfig(GPIO_PartialRemap_TIM3,ENABLE);

TIM_OCInitStrue.TIM_OCMode=TIM_OCMode_PWM2;
TIM_OCInitStrue.TIM_OutputState=TIM_OutputState_Enable;
TIM_OCInitStrue.TIM_OCPolarity=TIM_OCPolarity_High;
TIM_OC1Init(TIM3,&TIM_OCInitStrue);

TIM_TimeBaseInitStrue.TIM_Period=arr;
TIM_TimeBaseInitStrue.TIM_Prescaler=psc;
TIM_TimeBaseInitStrue.TIM_ClockDivision=0;
TIM_TimeBaseInitStrue.TIM_CounterMode=TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM3,&TIM_TimeBaseInitStrue);

TIM_Cmd(TIM3,ENABLE);
TIM_OC2PreloadConfig(TIM3, TIM_OCPreload_Enable);
}

#include "led.h"

void led_init(void)
{
GPIO_InitTypeDef GPIO_InitStrue;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB,ENABLE);

GPIO_InitStrue.GPIO_Mode=GPIO_Mode_AF_PP;
GPIO_InitStrue.GPIO_Pin=GPIO_Pin_4;
GPIO_InitStrue.GPIO_Speed=GPIO_Speed_50MHz;
GPIO_Init(GPIOB,&GPIO_InitStrue);
GPIO_ResetBits(GPIOB,GPIO_Pin_4);
}
[/mw_shl_code]

怎么LED0等不能像例程一样渐变 LED0等直接不亮了是不是需要对PB5进行配置？