stm32 红外

缺乏、安全感 2022-06-10 11:23 248阅读 0赞

![2][] ![1][]

`相关文章:`[http://blog.csdn.net/zhangxuechao\_/article/details/75039906][http_blog.csdn.net_zhangxuechao_article_details_75039906]

**举例**

u8 ir_tick() //记录高电平时间
    {
        u8 i = 0;
    
        while(ir_in == 1)
        {
            i++;
            if(i >= 250)
            {
                break;
            }
            delay_us(20); //一次循环20um
        }
    
        return i;
    }
    
    void EXTI15_10_IRQHandler()
    {
        u8 i = 0;
        u32 ir = 0;
        u8 ok = 0;
        u8 tick;
        u8 data;
    
        if(EXTI_GetITStatus(EXTI_Line15) == SET)
        {
            led1 = ~led1;
    
            while(1)
            {
                if(ir_in == 1)
                {           
                    tick = ir_tick();
    
                    if(tick >= 250) //错误码
                    {
                        break;
                    }
                    else if((tick >= 200) && (tick < 250)) //起始码
                    {
                        ok = 1;
                        continue;
                    }   
                    else if((tick >= 25) && (tick <= 40)) //0
                    {
                        data = 0;
                    }               
                    else if((tick >= 75) && (tick <= 90)) //1
                    {
                        data = 1;
                    }
                    else
                    {
                        break;
                    }
    
                    if(ok == 1)
                    {
                        ir <<= 1;
                        ir |= data;
                    }
    
                    if(i++ >= 32)
                    {
                        break;
                    }
                }           
            }
    
            if(ok == 1)
            {
                printf("ir %08x\n", ir);
            }
        }   
    
        EXTI_ClearITPendingBit(EXTI_Line15);
    }
    
    void IR_init()
    {
        GPIO_InitTypeDef gpio = 
        {
            GPIO_Pin_15,
            GPIO_Speed_50MHz,
            GPIO_Mode_IPU
        };  
    
        EXTI_InitTypeDef exti = 
        {
            EXTI_Line15,
            EXTI_Mode_Interrupt,
            EXTI_Trigger_Falling,
            ENABLE
        };
    
        NVIC_InitTypeDef nvic = 
        {
            EXTI15_10_IRQn,
            2,
            2,
            ENABLE
        };
    
        RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOG | RCC_APB2Periph_AFIO, ENABLE);
    
        GPIO_Init(GPIOG, &gpio);
    
        GPIO_EXTILineConfig(GPIO_PortSourceGPIOG, GPIO_PinSource15);
    
        NVIC_Init(&nvic);
    
        EXTI_Init(&exti);
    }

[2]: https://img-blog.csdn.net/20170817181453885?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvemhhbmd4dWVjaGFvXw==/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/SouthEast
[1]: /images/20220610/c1a5071bb3c4487987997d6597aff2b6.png
[http_blog.csdn.net_zhangxuechao_article_details_75039906]: http://blog.csdn.net/zhangxuechao_/article/details/75039906