stm32 按键控制温度阈值的代码

以下是一个使用 STM32 按键控制温度阈值的示例代码。

#include "stm32f10x.h"
#include "stm32f10x_gpio.h"
#include "stm32f10x_rcc.h"
#include "stm32f10x_adc.h"

#define ADC1_DR_Address ((u32)0x4001244C)

u16 ADC_ConvertedValue;
u16 ADC_Value;

u8 temp = 25; // 初始温度阈值为 25 ℃

void ADC1_Init(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;
    ADC_InitTypeDef ADC_InitStructure;

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_ADC1, ENABLE);

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    ADC_DeInit(ADC1);

    ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;
    ADC_InitStructure.ADC_ScanConvMode = DISABLE;
    ADC_InitStructure.ADC_ContinuousConvMode = DISABLE;
    ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None;
    ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
    ADC_InitStructure.ADC_NbrOfChannel = 1;
    ADC_Init(ADC1, &ADC_InitStructure);

    ADC_Cmd(ADC1, ENABLE);

    ADC_ResetCalibration(ADC1);
    while (ADC_GetResetCalibrationStatus(ADC1));

    ADC_StartCalibration(ADC1);
    while (ADC_GetCalibrationStatus(ADC1));
}

u16 Get_ADC_Value(void)
{
    ADC_RegularChannelConfig(ADC1, ADC_Channel_0, 1, ADC_SampleTime_239Cycles5);
    ADC_SoftwareStartConvCmd(ADC1, ENABLE);
    while (!ADC_GetFlagStatus(ADC1, ADC_FLAG_EOC));
    return ADC_GetConversionValue(ADC1);
}

int main(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;
    NVIC_InitTypeDef NVIC_InitStructure;
    TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
    TIM_OCInitTypeDef TIM_OCInitStructure;

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    TIM_TimeBaseStructure.TIM_Period = 4999;
    TIM_TimeBaseStructure.TIM_Prescaler = 7199;
    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;
    TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
    TIM_OC3Init(TIM2, &TIM_OCInitStructure);
    TIM_OC3PreloadConfig(TIM2, TIM_OCPreload_Enable);

    TIM_Cmd(TIM2, ENABLE);

    ADC1_Init();

    NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure);

    TIM_ClearITPendingBit(TIM2, TIM_IT_Update);
    TIM_ITConfig(TIM2, TIM_IT_Update, ENABLE);

    while (1)
    {
        ADC_Value = Get_ADC_Value();
        ADC_ConvertedValue = ADC_Value * 3300 / 0xFFF; // 将 ADC 值转换为电压值
    }
}

void TIM2_IRQHandler(void)
{
    if (TIM_GetITStatus(TIM2, TIM_IT_Update) != RESET)
    {
        TIM_ClearITPendingBit(TIM2, TIM_IT_Update);

        if (ADC_ConvertedValue > temp) // 当检测到温度高于阈值时，将 PWM 输出设置为 50%
        {
            TIM_SetCompare3(TIM2, 2500);
        }
        else // 当检测到温度低于阈值时，将 PWM 输出设置为 0%
        {
            TIM_SetCompare3(TIM2, 0);
        }

        if (GPIO_ReadInputDataBit(GPIOA, GPIO_Pin_5) == RESET) // 当按键按下时，增加温度阈值
        {
            temp++;
            while (GPIO_ReadInputDataBit(GPIOA, GPIO_Pin_5) == RESET);
        }

        if (GPIO_ReadInputDataBit(GPIOA, GPIO_Pin_6) == RESET) // 当按键按下时，减少温度阈值
        {
            temp--;
            while (GPIO_ReadInputDataBit(GPIOA, GPIO_Pin_6) == RESET);
        }
    }
}

在此示例中，我们使用 TIM2 的中断来实现 PWM 波的输出，并使用 ADC1 来检测温度。当检测到温度高于设置的阈值时，将 PWM 输出设置为 50%；当检测到温度低于阈值时，将 PWM 输出设置为 0%。同时，我们还通过按键来控制温度阈值的增加和减少。注意，这只是一个示例代码，具体的实现方式可能因应用场景的不同而有所不同。