PWM输出实验中，呼吸灯问题

weewwewe

例子是实现的DS0实现呼吸灯效果，我想知道能不能同时让两个灯都实现呼吸灯效果。TIM3通道2的部分重映射后正好是LED0的端口，而通道1确是在PB4。LED1端口在PE5.

lycreturn

回复【3楼】weewwewe:
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用PB4, 先禁止掉JTAG

lycreturn

PE5 不能输出PWM, 想要LED1用作呼吸灯, 可以用杜邦线连接PE5到一个能输出PWM的端口, 然后PE5设置为浮空输入

weewwewe

回复【2楼】lycreturn:
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谢谢你的回答哈，我看了下，部分重映射后，tim3通道一在PB4.我就用线连接PB4和PE5.
#include"led.h"
#include"pwm.h"
void TIM3_PWM_Init(u16 arr,u16 psc)
{
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB|RCC_APB2Periph_AFIO,ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3,ENABLE);

GPIO_PinRemapConfig(GPIO_PartialRemap_TIM3,ENABLE);
GPIO_InitStructure.GPIO_Pin=GPIO_Pin_5;
GPIO_InitStructure.GPIO_Mode=GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;
GPIO_Init(GPIOB,&GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin=GPIO_Pin_4;
GPIO_InitStructure.GPIO_Mode=GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;
GPIO_Init(GPIOB,&GPIO_InitStructure);


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

TIM_OCInitStructure.TIM_OCMode=TIM_OCMode_PWM2;
TIM_OCInitStructure.TIM_OCPolarity=TIM_OCPolarity_High;
TIM_OCInitStructure.TIM_OutputState=TIM_OutputState_Enable;

TIM_OC1Init(TIM3,&TIM_OCInitStructure);
TIM_OC1PreloadConfig(TIM3,TIM_OCPreload_Enable);

TIM_OC2Init(TIM3,&TIM_OCInitStructure);
TIM_OC2PreloadConfig(TIM3,TIM_OCPreload_Enable);
TIM_Cmd(TIM3,ENABLE);
}

int main(void)
{
u16 pwmval=0;
u8 we=1;
delay_init();
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
LED_Init();
TIM3_PWM_Init(899,0);
while(1)
{ 
delay_ms(5);
  if(we)pwmval++;
else pwmval--;
if(pwmval>300)we=0;
if(pwmval==0)we=1;
TIM_SetCompare1(TIM3,pwmval);
TIM_SetCompare2(TIM3,pwmval);
}

}
然后在LED初始化时，设置了PE5为浮空输入。还是不行，你看看问题在哪儿呢？

weewwewe

回复【4楼】lycreturn:
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恩恩，谢谢