在stm32中配置一个按键输入来控制LED灯的亮度
时间: 2023-06-01 18:02:22 浏览: 132
以下是一个基本的代码框架,实现了一个按键输入来控制LED灯的亮度:
```
#include "stm32f4xx.h"
#define LED_PIN GPIO_Pin_13
#define LED_PORT GPIOA
#define BUTTON_PIN GPIO_Pin_0
#define BUTTON_PORT GPIOA
void LED_Init(void);
void BUTTON_Init(void);
int main(void)
{
uint16_t led_brightness = 0;
uint8_t button_pressed = 0;
LED_Init();
BUTTON_Init();
while (1)
{
if (GPIO_ReadInputDataBit(BUTTON_PORT, BUTTON_PIN) == Bit_RESET)
{
button_pressed = 1;
}
else if (button_pressed)
{
button_pressed = 0;
led_brightness += 10;
if (led_brightness > 100)
{
led_brightness = 0;
}
TIM_SetCompare1(TIM1, led_brightness);
}
}
}
void LED_Init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1 | RCC_APB2Periph_GPIOA, ENABLE);
GPIO_InitStructure.GPIO_Pin = LED_PIN;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(LED_PORT, &GPIO_InitStructure);
TIM_TimeBaseStructure.TIM_Prescaler = 84 - 1;
TIM_TimeBaseStructure.TIM_Period = 1000 - 1;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);
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(TIM1, &TIM_OCInitStructure);
TIM_Cmd(TIM1, ENABLE);
TIM_CtrlPWMOutputs(TIM1, ENABLE);
}
void BUTTON_Init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
GPIO_InitStructure.GPIO_Pin = BUTTON_PIN;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_Init(BUTTON_PORT, &GPIO_InitStructure);
}
```
在这个代码中,我们使用了STM32的定时器和PWM输出来控制LED灯的亮度。我们通过按键输入来增加LED灯的亮度,并循环调整LED灯的亮度。需要注意的是,我们需要在初始化时打开定时器和PWM输出的开关,否则LED灯将不能正常输出。
在实际应用中,我们可以根据具体的需求来调整LED灯的亮度范围和步进大小,以及按键输入的响应方式等。