stm32霍尔传感器测速代码

以下是一个使用STM32的定时器和外部中断来测量霍尔传感器速度的示例代码：

#include "stm32f10x.h"

#define HALL_SENSOR_PIN GPIO_Pin_0
#define HALL_SENSOR_PORT GPIOA

volatile uint16_t hallSensorCounter = 0;
volatile uint16_t hallSensorSpeed = 0;

void TIM2_IRQHandler(void)
{
    // 清除定时器中断标志位
    TIM_ClearITPendingBit(TIM2, TIM_IT_Update);

    // 计算速度
    hallSensorSpeed = hallSensorCounter * 60 / 2;

    // 重置计数器
    hallSensorCounter = 0;
}

void EXTI0_IRQHandler(void)
{
    // 清除外部中断标志位
    EXTI_ClearITPendingBit(EXTI_Line0);

    // 增加计数器
    hallSensorCounter++;
}

int main(void)
{
    // 初始化GPIO为输入模式
    GPIO_InitTypeDef GPIO_InitStructure;
    GPIO_InitStructure.GPIO_Pin = HALL_SENSOR_PIN;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPD;
    GPIO_Init(HALL_SENSOR_PORT, &GPIO_InitStructure);

    // 初始化定时器2
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
    TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
    TIM_TimeBaseStructure.TIM_Period = 999;
    TIM_TimeBaseStructure.TIM_Prescaler = 71;
    TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
    TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
    TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);
    TIM_ITConfig(TIM2, TIM_IT_Update, ENABLE);
    TIM_Cmd(TIM2, ENABLE);

    // 初始化外部中断0
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_AFIO, ENABLE);
    GPIO_EXTILineConfig(GPIO_PortSourceGPIOA, GPIO_PinSource0);
    EXTI_InitTypeDef EXTI_InitStructure;
    EXTI_InitStructure.EXTI_Line = EXTI_Line0;
    EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
    EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising_Falling;
    EXTI_InitStructure.EXTI_LineCmd = ENABLE;
    EXTI_Init(&EXTI_InitStructure);

    // 配置中断优先级
    NVIC_InitTypeDef NVIC_InitStructure;
    NVIC_InitStructure.NVIC_IRQChannel = EXTI0_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure);

    NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure);

    while (1)
    {
        // 在这里可以使用速度数据进行其他操作
    }
}

以上代码中，使用了定时器和外部中断来实现测量速度。当定时器溢出时，会触发中断并计算速度；当外部中断引脚有信号变化时，会触发中断并增加计数器。定时器的计数器时钟为72MHz，定时器的周期为1ms，所以速度计算公式是：转速 = 计数器值 * 60 / 2。