替换c中的switch语句 [英] replacing a switch statement in c

问题描述

我想知道是否可以向您寻求帮助，我正在玩一个pic USB接口教程，该教程中将未签名的字符从c ++应用程序写入固件.

I was wondering if I could ask you for some help, i''m playing with a pic USB interface tutorial, where an unsigned char is written to the firmware from a c++ application.

ProcessIO(void)
{
if((USBDeviceState < CONFIGURED_STATE)||(USBSuspendControl==1)) return;
       if(!HIDRxHandleBusy(USBOutHandle))                                    
           {
             switch(RecievedDataBuffer[0])
              {
                 case 0x01:          //do something          
           break;
                 case 0x02:          //do something
           break;
              }
	USBOutHandle = HIDRxPacket(HID_EP,(BYTE*)&ReceivedDataBuffer,64);
    }
} 

问题在于通过switch语句测试了RecievedDataBuffer [0].我大约有60种不同的命令要通过cs应用程序通过USB发送到固件(我正在谈论的代码是PIC 18F的固件)，唯一的区别是存储在DataRecievedBuffer [0]中的hexi代码.因此，我只用不同的十六进制值编写了60条switch语句，而不是将上面的switch语句替换为以下代码:

The problem is the RecievedDataBuffer[0] is tested through switch statements. I have about 60 different commands to be sent VIA usb to the firmware from a c++ application (the code I am talking about is the firmware for a PIC 18F), the only difference being the hexi code stored in the DataRecievedBuffer[0]. So instead of writing 60 switch statements, only with different hex values, I would just like to replace the switch statement above to the code below:

j = ReceivedDataBuffer[0];             //unsigned char j = recieved data
        upper_nibble = j & 0x0f0;              //bit mask lower bits
        PORTB = upper_nibble;
        DelayMs(100);

        RB1 = 1;                               //pulse enable line
        DelayMs(100);
        RB1 = 0;
        DelayMs(100);

        PORTB = 0x00;
        k = (j << 4) | (j >> 4);               //swap nibbles
        lower_nibble = k & 0x0f0;              //again bit mask to leave the lower nibble         PORTB = lower_nibble;

        DelayMs(100);
        RB1 = 1;                               //pulse enable and reset
        DelayMs(100);
        RB1 = 0;
        DelayMs(100);
        PORTB = 0x00;                          //clear port

因此，我希望将缓冲区中收到的每个命令发送到PIC的管脚，但是程序崩溃了……您对如何解决此问题有任何建议吗?

好的...我认为这还不清楚...目前，在以下之间有一个switch语句:

So i''m looking to send each command recieved in the buffer to the pins of my PIC, but the program crashes...Do you have any suggestion of how I could fix this?

OK...I think this is pretty unclear...At the moment, there is a switch statement between:

if(!HIDRxHandleBusy(USBOutHandle))

...和

...and

USBOutHandle = HIDRxPacket(HID_EP,(BYTE*)&ReceivedDataBuffer,64);

我要做的只是从页面顶部向下的第二个代码块替换此switch语句，但是似乎当我尝试放置除上述switch语句之外的其他语句时，系统完全没有响应.我没有在线防盗器，所以我盲目地这样做.我只是想知道有人在替换时是否会发现根本上的错误:

All i would like to do is replace this switch statement with the second block of code down from the top of this page, but it seems like when ever I try to put a statement other than the switch statement above, the system is completly unresponsive. I don''t have an in-circuit degugger so I''m doing this blindly. I was just wondering if somebody could see something fundamentally wrong in replacing:

switch(RecievedDataBuffer[0])

像这样:

with something like:

If( (RecievedDataBuffer[0]) = 0x02)

谢谢

Martyn

Thanks

Martyn

推荐答案

如此简单

If((RecievedDataBuffer [0])= 0x02)
{
}
else If((RecievedDataBuffer [0])= 0x01)
{
}
其他
{
cout<< 下地狱"；
}

its so easy

If( (RecievedDataBuffer[0]) = 0x02)
{
}
else If( (RecievedDataBuffer[0]) = 0x01)
{
}
else
{
cout << "gone to hell";
}

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