Re: [avr-gcc-list] [newbie]Toggle a bit value

[David Kelly]

On Oct 12, 2005, at 8:39 PM, Sumeet Pal Singh wrote:

> Hi
> How do a toggle a value at one pin of port the current value i do  
> not know
> i know the pin can be set or cleared using _BV and ~_BV resp.
> but when I tried to do
>
> PORTA1=!PORTA1,

How is PORTA1 defined?

> the compiler gives error
> main.cpp:20: error:non-lvalue in assignment
>
> can someone tell me what i am doing wrong and why (i wish to  
> understand how the compiler handled this line
> Also how to do this
>
> In sdcc for 8051 i used PortA.1=!PortA.1 and it worked well

Notice how you wrote it differently in two places?  Try this to  
toggle bit 0 of PORTA:

PORTA ^= (1<<0);

The caret '^' is exclusive-or.

--
David Kelly N4HHE, address@hidden
========================================================================
Whom computers would destroy, they must first drive mad.