Embedded XMEGA-A3BU说明-使用DMA轮询确定按钮1是否按下

如果使用轮询按下SW1，则分配要求我们打开LED。我相信我正在设置每个端口的方向并正确读取寄存器。但是，当我按下SW1时，什么也没有发生。在代码运行时，无法调试和中断代码以查看寄存器中的内容

[HWGuide]状态：[HWGuide]：

[数据表]状态：[数据表]：

[手动]状态：[手动]：

代码：

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我希望寄存器读取（0x02）0000 0010或反向（0xFD）1111 1101，如果按下按钮，LED将打开或关闭。

使用位操作隔离我试图轮询的位。我不知道其他的比特可以被设置成什么

int main(void)
{
    //set PORTR direction
    WriteReg(PORTR, 0xFF);
    //set PORTF direction
    WriteReg(PORTF, 0xF9);
    while(1)
    {
        char statusPF1 = (ReadReg(PORTF_IN) & 0x02) >> 1;
        char statusPF2 = (ReadReg(PORTF_IN) & 0x04) >> 2;

        if((statusPF1 == 0)) //if PF1 = 0
        {
            WriteReg(PORTR_OUTTGL, 0x01); //toggle LED0
            _delay_ms(1000);
        }
        if((statusPF2 == 0)) //if PF2 = 0
        {
            WriteReg(PORTR_OUTTGL, 0x02); //toggle LED1
            _delay_ms(1000);
        }
        if ((statusPF1 != 0) && (statusPF2 != 0))
        {
            _blinkLEDs();
        }
    }
}

//PORTR starts at address = 0x07E0
//PORTF starts at address = 0x06A0

//Data Input Value register on I/O = (Addr) + 0x08 = 0x06A8 (PORTF)

#define PORTR    *((volatile unsigned char *)0x7E0) /* I/O Port Register */
#define PORTF    *((volatile unsigned char *)0x6A0) /* I/O Port Register */
#define PORTF_IN *((volatile unsigned char *)0x6A8) //PORTF Input Value Reg
#define PORTR_OUTTGL    *((volatile unsigned char *)0x7E7) //LED Toggle Reg

#define ReadReg(port)           (port)
#define WriteReg(port, value)   (port = value)

int main(void)
{
    //set PORTR direction
    WriteReg(PORTR, 0xFF);
    //set PORTF direction
    WriteReg(PORTF, 0x00);
    while(1)
    {
        if((ReadReg(PORTF_IN) == 0xFD)) //if PF1 = 0
        { 
            WriteReg(PORTR_OUTTGL, 0x3); //toggle LEDs
        {
    {
}

int main(void)
{
    //set PORTR direction
    WriteReg(PORTR, 0xFF);
    //set PORTF direction
    WriteReg(PORTF, 0xF9);
    while(1)
    {
        char statusPF1 = (ReadReg(PORTF_IN) & 0x02) >> 1;
        char statusPF2 = (ReadReg(PORTF_IN) & 0x04) >> 2;

        if((statusPF1 == 0)) //if PF1 = 0
        {
            WriteReg(PORTR_OUTTGL, 0x01); //toggle LED0
            _delay_ms(1000);
        }
        if((statusPF2 == 0)) //if PF2 = 0
        {
            WriteReg(PORTR_OUTTGL, 0x02); //toggle LED1
            _delay_ms(1000);
        }
        if ((statusPF1 != 0) && (statusPF2 != 0))
        {
            _blinkLEDs();
        }
    }
}