写一个基于STM32F103ZE的霍尔传感器测转速显示库函数代码

以下是一个基于STM32F103ZE的霍尔传感器测转速显示库函数代码：

首先，需要定义一些宏定义和变量：

#include "stm32f10x.h"
#define HALL_PIN GPIO_Pin_0
#define HALL_PORT GPIOA
#define HALL_RCC RCC_APB2Periph_GPIOA
#define TIMER_RCC RCC_APB1Periph_TIM2
#define TIMER TIM2
#define TIMER_IRQ TIM2_IRQn
volatile uint16_t hall_count = 0;
volatile uint16_t rpm = 0;

接下来，需要初始化GPIO和定时器：

void hall_sensor_init(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;
    TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
    NVIC_InitTypeDef NVIC_InitStruct;
    
    RCC_APB2PeriphClockCmd(HALL_RCC, ENABLE);
    RCC_APB1PeriphClockCmd(TIMER_RCC, ENABLE);
    
    GPIO_InitStructure.GPIO_Pin = HALL_PIN;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
    GPIO_Init(HALL_PORT, &GPIO_InitStructure);
    
    TIM_TimeBaseStructure.TIM_Period = 0xFFFF;
    TIM_TimeBaseStructure.TIM_Prescaler = 72 - 1;
    TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
    TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
    TIM_TimeBaseInit(TIMER, &TIM_TimeBaseStructure);
    
    TIM_ITConfig(TIMER, TIM_IT_Update, ENABLE);
    NVIC_InitStruct.NVIC_IRQChannel = TIMER_IRQ;
    NVIC_InitStruct.NVIC_IRQChannelPreemptionPriority = 0;
    NVIC_InitStruct.NVIC_IRQChannelSubPriority = 0;
    NVIC_InitStruct.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStruct);
    
    TIM_Cmd(TIMER, ENABLE);
}

接下来，需要实现定时器的中断处理函数，每次中断计算转速并显示：

void TIM2_IRQHandler(void)
{
    if (TIM_GetITStatus(TIMER, TIM_IT_Update) != RESET)
    {
        TIM_ClearITPendingBit(TIMER, TIM_IT_Update);
        
        hall_count = TIM_GetCounter(TIMER);
        TIM_SetCounter(TIMER, 0);
        
        rpm = hall_count * 60 / 7;
        // 显示rpm的代码这里省略
    }
}

最后，在主函数中调用初始化函数即可：

int main(void)
{
    hall_sensor_init();
    
    while(1)
    {
        // 主函数代码这里省略
    }
}