OSAL-KEY

分析一下代码。

1、 初始化IO为输入，且初始一些全局变量

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void HalKeyInit( void )
{
    halKeySavedKeys = 0;  // Initialize previous key to 0.


    P0SEL &= ~(BV(1));    /* Set pin function to GPIO */
    P0DIR &= ~(BV(1));    /* Set pin direction to Input */

    /* Initialize callback function */
    pHalKeyProcessFunction  = NULL;

    /* Start with key is not configured */
    HalKeyConfigured = FALSE;
}

2、 开启中断

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//如果打开中断，就不开启定时器，否则开启定时器
void HalKeyConfig (bool interruptEnable, halKeyCBack_t cback)
{
    /* Enable/Disable Interrupt or */
    Hal_KeyIntEnable = interruptEnable;

    /* Register the callback fucntion */
    pHalKeyProcessFunction = cback;

    /* Determine if interrupt is enable or not */
    if (Hal_KeyIntEnable)
    {
        /* Rising/Falling edge configuratinn */
        PICTL |= BV(0);   //bit0:设置PO端口的中断触发模式   0: Rising edge on input gives interrupt.  1: Falling edge on input gives interrupt.

        P0IEN |= BV(1); /* enable interrupt generation at port */
        IEN1 |= BV(5);   /* enable CPU interrupt */
        P0IFG = ~(BV(1)); /* Clear any pending interrupt */

        /* Do this only after the hal_key is configured - to work with sleep stuff */
        if (HalKeyConfigured == TRUE)
        {
            osal_stop_timerEx(Hal_TaskID, HAL_KEY_EVENT);  /* Cancel polling if active */
        }
    }
    else    /* Interrupts NOT enabled */
    {

        P0IEN &= ~(BV(1)); /* don't generate interrupt */
        IEN1 &= ~(BV(5));   /* Clear interrupt enable bit */

        osal_set_event(Hal_TaskID, HAL_KEY_EVENT);
    }

    /* Key now is configured */
    HalKeyConfigured = TRUE;
}

3、IO中断产生，延时任务，去键抖动。

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4、 事件的处理地方

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5、 回调函数的分析

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6、 发送事件

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