起源

最近在做的项目充电LED灯闪烁

正常的HAL层代码是这样的

想要实现闪烁功能，只需要向驱动的blink节点写入值就可以。

但是我们的平台没有这个节点，那我只能在HAL层实现这个功能，重写驱动也是可以的，不过我认为这样更省事。

实现


err = pthread_create(&tid, NULL, BlinkThread,(void*)&blink);
        if(err!=0)
            LOGE(">>>  pthread_create error");

static void* BlinkThread(void* param)
{
    int err = 0;
    static int st_blink = 0;
    static char st_red = 0,st_green =0,st_blue=0;

    /*专心跑子线程*/
    while(1)
    {
        /*状态改变才打印信息*/
        if(st_red != red ||st_blue!=blue||st_blink!=blink||st_green!=green)
        {
            st_red = red;
            st_blue = blue;
            st_green = green;
            st_blink = blink;
            LOGI(">>>  BlinkThread blink:%d red:%d green:%d blue:%d ",st_blink,red,green,blue);
        }
        /*执行下面的代码需要锁住线程*/
        pthread_mutex_lock(&g_lock);
        if(st_blink)
        {
            if (red)
            {
                err |= write_int(RED_LED_PATH, 1);
                msleep(onMS);
                err |= write_int(RED_LED_PATH, 0);
                msleep(offMS);
            }
            if (green)
            {
                err = write_int(GREEN_LED_PATH, 1);
                msleep(onMS);
                err = write_int(GREEN_LED_PATH, 0);
                msleep(offMS);
            }
            if (blue)
            {
                err = write_int(BLUE_LED_PATH, 1);
                msleep(onMS);
                err = write_int(BLUE_LED_PATH, 0);
                msleep(offMS);
            }
        }
        pthread_mutex_unlock(&g_lock);
    }
    return NULL;
}