stm32f103c8t6做出呼吸灯效果
时间: 2024-06-06 22:04:18 浏览: 248
STM32F103C8T6是一款基于ARM Cortex-M3内核的微控制器,可以通过编程来实现各种功能。呼吸灯效果是一种常见的LED灯效果,可以通过控制LED的亮度和暗度来模拟人类呼吸的过程。下面是实现呼吸灯效果的基本步骤:
1. 初始化GPIO:选择一个GPIO引脚作为控制LED灯的引脚,并将其设置为输出模式。
2. 设置定时器:为了实现呼吸灯效果,需要使用定时器来控制LED的亮度和暗度。可以选择TIM2定时器,并设置其工作模式为PWM输出模式。
3. 编写呼吸灯代码:在定时器中断服务函数中编写呼吸灯代码。具体实现方法是通过改变PWM占空比的大小来控制LED灯的亮度和暗度,从而实现呼吸灯效果。
下面是一份简单的呼吸灯代码,供您参考:
```
#include "stm32f10x.h"
void LED_GPIO_Configuration(void);
void TIM2_Configuration(void);
int main(void)
{
LED_GPIO_Configuration();
TIM2_Configuration();
while(1);
}
void LED_GPIO_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB, &GPIO_InitStructure);
}
void TIM2_Configuration(void)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
TIM_TimeBaseStructure.TIM_Period = 1000-1; // 定时器周期为1ms
TIM_TimeBaseStructure.TIM_Prescaler = 72-1; // 定时器预分频为72
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = 0; // 初始占空比为0%
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OC1Init(TIM2, &TIM_OCInitStructure);
TIM_Cmd(TIM2, ENABLE);
}
void TIM2_IRQHandler(void)
{
static uint16_t brightness = 0;
static uint8_t direction = 1;
if(TIM_GetITStatus(TIM2, TIM_IT_Update) != RESET)
{
if(direction)
{
brightness++;
if(brightness == 1000)
direction = 0;
}
else
{
brightness--;
if(brightness == 0)
direction = 1;
}
TIM_SetCompare1(TIM2, brightness);
TIM_ClearITPendingBit(TIM2, TIM_IT_Update);
}
}
```
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