stm32f103c8t6pwm呼吸灯
时间: 2023-05-17 21:06:13 浏览: 72
可以使用定时器和PWM模块来实现呼吸灯效果。以下是一个简单的代码示例:
#include "stm32f10x.h"
void TIM3_IRQHandler(void)
{
if (TIM_GetITStatus(TIM3, TIM_IT_Update) != RESET)
{
TIM_ClearITPendingBit(TIM3, TIM_IT_Update);
static uint16_t brightness = 0;
static uint8_t direction = 1;
if (brightness == 0 || brightness == 1000)
{
direction = !direction;
}
if (direction)
{
brightness++;
}
else
{
brightness--;
}
TIM_SetCompare1(TIM3, brightness);
}
}
int main(void)
{
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
GPIO_InitTypeDef GPIO_InitStructure;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_TimeBaseStructure.TIM_Period = 1000;
TIM_TimeBaseStructure.TIM_Prescaler = 7200;
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);
TIM_OCInitTypeDef TIM_OCInitStructure;
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = 0;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OC1Init(TIM3, &TIM_OCInitStructure);
TIM_ITConfig(TIM3, TIM_IT_Update, ENABLE);
NVIC_EnableIRQ(TIM3_IRQn);
TIM_Cmd(TIM3, ENABLE);
while (1)
{
}
}
这个代码使用TIM3的PWM输出来控制LED的亮度,通过改变占空比来实现呼吸灯效果。每次定时器溢出时,占空比会逐渐增加或减少,直到达到最大或最小值时,就会反向改变方向。