LED驱动设计及实现

1 LED驱动流程图分析

这里主要分析led_on和led_blink流程。

1.1 led_on流程图分析

1.2 led_blink流程图分析

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2 代码实现

代码使用HAL库开发，并且配置freertos。HAL配置太简单了，没啥需要注意的就不记录了。

drv_led.h:

#ifndef __DRV_LED_H
#define __DRV_LED_H


void led_init(void);
void led_on(uint32_t time_sec);
void led_off(void);
void led_blink(uint32_t period,uint32_t time_sec);

#endif

drv_led.c:

#include <stdbool.h>
#include <string.h>
#include "main.h"

#include "FreeRTOS.h"
#include "timers.h"


#define LED_OFF()       HAL_GPIO_WritePin(LED_GPIO_Port,LED_Pin,GPIO_PIN_SET)
#define LED_ON()        HAL_GPIO_WritePin(LED_GPIO_Port,LED_Pin,GPIO_PIN_RESET)
#define LED_TOGGLE()    HAL_GPIO_TogglePin(LED_GPIO_Port,LED_Pin)

typedef enum{
    LED_STATE_OFF,
    LED_STATE_ON,
    LED_STATE_BLINK,
}led_state_e;

static bool is_inited=false;
static TimerHandle_t timer_led;
static uint8_t state;

struct led_control_t
{
    uint32_t time_on;
    uint32_t time_blink;
    uint32_t period_blink;

    uint32_t cnt_time_on;
    uint32_t cnt_time_blink;
    uint32_t cnt_period_blink;
}ledctl;



void led_timer_callback( TimerHandle_t xTimer )
{
    switch (state)
    {
        case LED_STATE_ON:
            ledctl.cnt_time_on++;
            if(ledctl.cnt_time_on>=ledctl.time_on)
            {
                LED_OFF();
                ledctl.cnt_time_on=0;
                xTimerStop(timer_led,1000);
            }
            break;
        case LED_STATE_BLINK:
            ledctl.cnt_time_blink++;
            ledctl.cnt_period_blink++;
            if(ledctl.cnt_time_blink>=ledctl.time_blink)
            {
                LED_OFF();
                ledctl.cnt_time_blink=0;
                xTimerStop(timer_led,1000);
                break;
            }
            if(ledctl.cnt_period_blink>=ledctl.period_blink)
            {
                ledctl.cnt_period_blink=0;
                LED_TOGGLE();
            }
            break;
        default:
            break;
    }
    
}


void led_init(void)
{
    state=LED_STATE_OFF;
    memset(&ledctl,0,sizeof(ledctl));
    timer_led=xTimerCreate("timer_led",100,pdTRUE,NULL,led_timer_callback);
    LED_OFF();
    is_inited=true;
}
void led_on(uint32_t time_sec)
{
    if(!is_inited)return ;
    xTimerStop(timer_led,1000);

    ledctl.time_on=time_sec*10;
    ledctl.cnt_time_on=0;

    LED_ON();
    state=LED_STATE_ON;
    xTimerStart(timer_led,1000);
}
void led_off(void)
{
    if(!is_inited)return ;
    
    xTimerStop(timer_led,1000);
    LED_OFF();
    state=LED_STATE_OFF;
    
    ledctl.cnt_time_on=0;
    ledctl.cnt_time_blink=0;
    ledctl.cnt_period_blink=0;
}
void led_blink(uint32_t period,uint32_t time_sec)
{
    if(!is_inited)return ;
    xTimerStop(timer_led,1000);

    ledctl.time_blink=time_sec*10;
    ledctl.period_blink=period;
    ledctl.cnt_time_blink=0;
    ledctl.cnt_period_blink=0;

    LED_ON();
    state=LED_STATE_BLINK;
    xTimerStart(timer_led,1000);
}