[En-Nut-Discussion] Low level port access with porttran.h

[Ulrich Prinz]

On Mon, 07 Sep 2009 12:12:08 +0200, Andre Riesberg <andre at riesberg-net.de> 
wrote: 
> Hi Harald, 
>  
> I have just finished my 1-Wire interface for the AVR's. But this  
> interface works only with a (quick) fix in the "porttran.h" file.: 
>  
> Line 404: 
>  
> #if defined(GPIO_PDS_REG) 
> //#define GPIO_GET(b)         ((inr(GPIO_PDS_REG) & _BV(b)) == _BV(b)) 
> #define GPIO_GET(b)         ((inb(GPIO_PDS_REG) & _BV(b)) == _BV(b)) 
> #else 
> #define GPIO_GET(b) 
> #endif 
>  
> This works fine, but I think this is not the solution you prefer! In the  
> moment I am not sure in with file I have to add the "inb" function for  
> AVR's. 
> Can anybody make this modification or help me to make this modification?  
> Then I be able to post my 1-Write interface... 
>  
 
Hmm...  
In include/arch/avr.h there is no definition for inr. inr is only defined 
for ARM and AVR32. 
So normally there must have been a compiler error if using GPIO_GET(b) with 
the original code. With Andres code it should work. 
 
May no one stumbled accross that one as no one used a recent compiler where 
the libc is updated? 
 
Harald, I like this patch and if Andre verified it to work... 
Optionally inr and outr should be mapped to inb and outb for 8-bit 
architecture, what may be more elegant for the arch-independance. 
 
Best regards, 
Ulrich