32单片机连接霍尔传感器来测量直流电机转速代码

以下是一种基于STM32单片机连接霍尔传感器来测量直流电机转速的代码：

#include "stm32f10x.h"

#define HALL_SENSOR_PIN GPIO_Pin_0
#define HALL_SENSOR_PORT GPIOA

volatile uint32_t rpm = 0;

void TIM3_IRQHandler(void)
{
    if (TIM_GetITStatus(TIM3, TIM_IT_Update) == SET)
    {
        rpm = (uint32_t)(60 * 1000 * (float)(TIM_GetCounter(TIM3)) / (float)(2000));
        TIM_SetCounter(TIM3, 0);
        TIM_ClearITPendingBit(TIM3, TIM_IT_Update);
    }
}

void hall_sensor_init(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);

    GPIO_InitStructure.GPIO_Pin = HALL_SENSOR_PIN;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
    GPIO_Init(HALL_SENSOR_PORT, &GPIO_InitStructure);
}

void timer_init(void)
{
    TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
    NVIC_InitTypeDef NVIC_InitStructure;

    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);

    TIM_TimeBaseStructure.TIM_Period = 36000 - 1;
    TIM_TimeBaseStructure.TIM_Prescaler = 72 - 1;
    TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
    TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);

    TIM_ITConfig(TIM3, TIM_IT_Update, ENABLE);
    TIM_Cmd(TIM3, ENABLE);

    NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure);
}

int main(void)
{
    hall_sensor_init();
    timer_init();

    while (1)
    {
        // Do something else here
    }
}

在这个代码中，我们使用了STM32的定时器(TIM3)来测量电机转速，而霍尔传感器则通过GPIO口连接到了单片机的PA0引脚。在定时器中断中，我们使用了定时器的计数器值来计算电机转速，并将结果存储在rpm变量中。在主循环中，我们可以使用这个变量来做其他的处理。