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Re: [avr-gcc-list] buggy variable naming with underscores
From: |
Jamie Morken |
Subject: |
Re: [avr-gcc-list] buggy variable naming with underscores |
Date: |
Mon, 14 Mar 2005 15:55:12 -0800 |
Hi,
----- Original Message -----
From: Parthasaradhi Nayani <address@hidden>
Date: Monday, March 14, 2005 5:11 am
Subject: Re: [avr-gcc-list] buggy variable naming with underscores
>
> --- Jamie Morken <address@hidden> wrote:
>
> > "volatile u08 motor_direction;"
> >
> > So I changed it to this name:
> >
> > "volatile u08 motorDirection;"
> >
> > and it works now.
>
> I just can not understand how the compiler
> differentiates between variables with and without
> underscores!!!!!!!!!
It took me a long time to track down, and I found the error. I was hoping to
be able to report a snazzy bug, but it is because I wrote to an array out of
bounds, and I must have corrupted another variable intermittently (for the last
several years). I guess changing the name of the variable may have moved it in
memory! The code is in the ADC interrupt.
SIGNAL(SIG_ADC)
{
u08 lt;
u08 ht;
lt=inp(ADCL);
ht=inp(ADCH)& 0x03;
ADChannels[nNextAdc-1]=(((u16)ht)<<8)|lt;
nNextAdc++;
if (nNextAdc==8) nNextAdc=0;
outp(nNextAdc,ADMUX);
}
I try to store the 8 channels into an array but all 8 channels are shifted one
index in the array when I print them out.
ie.
printf("x: %i\r\n", (int)(ADChannels[0]);
this prints out ADC channel 1 unless I subtract 1 from nNextAdc like above.
so the index 0 is ADC channel 1 instead of ADC channel 0. So the "solution" I
used was to write to index -1 to 7, and somehow this corrected the problem, but
then I was also corrupting other memory I guess! :) Any sample code that
continously logs all 8 ADC channels to an array? (without corrupting memory!)
I have a 1 bit offset somewhere I know, but I am not sure where..
cheers,
Jamie
>
> The under score is not a token to be parsed by the
> compiler.
>
> Nayani
>
>
>
>
>
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