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

[Andre Riesberg]

Hi all,

I am writing a 1-wire interface. This interface has a strict timing so I 
use the macros from "porttran.h".
Changing the port direction, setting high and low works fine 
(GPIO_INPUT, GPIO_OUTPUT, GPIO_SET_LO and GPIO_SET_HI).
Only the macro GP_IS_HI fails to compile and gives me the message:
        warning: implicit declaration of function 'inr'

In the file "porttran.h" I found this:

#if defined(GPIO_ODS_REG)
#define GPIO_IS_HI(b)       ((inr(GPIO_ODS_REG) & _BV(b)) == _BV(b))
#elif defined(GPIO_SOD_REG)
#define GPIO_IS_HI(b)       ((inr(GPIO_SOD_REG) & _BV(b)) == _BV(b))
#else
#define GPIO_IS_HI(b)
#endif

But I think ist must like this:

#if defined(GPIO_ODS_REG)
#define GPIO_IS_HI(b)       ((inr(GPIO_ODS_REG) & _BV(b)) == _BV(b))
#elif defined(GPIO_SOD_REG)
#define GPIO_IS_HI(b)       ((inb(GPIO_SOD_REG) & _BV(b)) == _BV(b))
#else
#define GPIO_IS_HI(b)
#endif

The different is in line four: "inr" changed to "inb".

I use an AT90CAN128 and I think "inb" ist the typical macro (for an AVR) 
to read one byte from a port. "inr" is for the ARM cpu's.

Is this correct?

Greetings
Andre