PWM控制LED为啥不行啊

只看该作者 · 2022-7-30 12:16

#include "stm32f10x.h"

void PWM_Init(void)
{
RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
GPIO_InitTypeDef GPIO_InitStructure;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);

TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStructure;
TIM_TimeBaseInitStructure.TIM_ClockDivision = TIM_CKD_DIV1;
TIM_TimeBaseInitStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInitStructure.TIM_Period = 900 - 1; //ARR
TIM_TimeBaseInitStructure.TIM_Prescaler = 1 - 1; //PSC
TIM_TimeBaseInitStructure.TIM_RepetitionCounter = 0;
TIM_TimeBaseInit(TIM1, &TIM_TimeBaseInitStructure);
TIM_ARRPreloadConfig(TIM1, ENABLE);

TIM_OCInitTypeDef TIM_OCInitStructure;
TIM_OCStructInit(&TIM_OCInitStructure);
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = 0; //CCR
TIM_OC1Init(TIM1, &TIM_OCInitStructure);
TIM_Cmd(TIM1, ENABLE);

}

#include "stm32f10x.h" // Device header
#include "PWM.h"
#include "delay.h"
#include "led.h"

uint8_t i;

int main(void)
{

PWM_Init();
LED1_ON();

while (1)
{
for (i=0; i <=300; i++)
{
PWM_SetCompare1(i);
delay_ms(10);
}
for (i = 0; i <= 300; i++)
{
PWM_SetCompare1(300 - i);
delay_ms(10);
}
}
}

void PWM_SetCompare1(uint16_t Compare)
{
TIM_SetCompare1(TIM1, Compare);
}