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下面的这些代码是 blackfin bf537 的 LED 闪烁程序示例，LED 将从右到左闪烁并切换回。/**/

EX_INTERRUPT_HANDLER(Timer0_ISR)
{
// confirm interrupt handling
*pTIMER_STATUS = 0x0001;

// shift old LED pattern by one, left to right
if(sLight_Move_Direction)
{
    if((ucActive_LED = ucActive_LED >> 1) <= 0x0020) ucActive_LED = 0x1000;
}
else
{
    if((ucActive_LED = ucActive_LED << 1) == 0x0020) ucActive_LED = 0x0020;
}

// write new LED pattern to PORTF LEDs
*pPORTFIO_TOGGLE = ucActive_LED;

/**/

现在我正在尝试修改代码以完成新功能，我希望它在我按下按钮时从左到右闪烁一次，所以下面有我的代码：/**/

EX_INTERRUPT_HANDLER(Timer0_ISR)
{
// confirm interrupt handling
*pTIMER_STATUS = 0x0001;

// shift old LED pattern by one, left to right
if(sLight_Move_Direction){

    ucActive_LED == 0x0800;

    ucActive_LED = ucActive_LED >> 1;

    ucActive_LED == 0x0040; 
}

// write new LED pattern to PORTF LEDs  
*pPORTFIO_TOGGLE = ucActive_LED;

/**/

现在它无法工作或只是闪烁 LED3，我该如何解决？

谢谢

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1 回答 1

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经过几天的思考，这是我的答案：

int Mode;

EX_INTERRUPT_HANDLER(Timer0_ISR)
{
    // confirm interrupt handling
    *pTIMER_STATUS = 0x0001;

    if(Mode == 1)
    {
    if((ucActive_LED = ucActive_LED >> 1) <= 0x0020) 
        ucActive_LED = 0x1000;
    }
    else if(Mode == 2)
    {
     if((ucActive_LED = ucActive_LED << 1) >= 0x1000) 
     ucActive_LED = 0x0020;             
    }
    else if(Mode == 3)
    {
    if((ucActive_LED = ucActive_LED >> 2) <= 0x0020) 
        ucActive_LED = 0x1000;  
    }


    // write new LED pattern to PORTF LEDs  
    *pPORTFIO = ucActive_LED;  
    }

然后将PORTFIO设置为从PF2到PF5（SW13~SW10）每个按钮对应每个模式，因此我们可以看到模式1是LED从左到右闪烁。模式 2 从右向左闪烁。模式 3 正在闪烁 LED 2、4 和 6。

于 2017-08-31T09:45:00.540 回答