[avr-gcc-list] nested macros don't expand

[George Kvirkvia]

I've ran into the problem when I tried to write simple port manipulation macros for avr

#define MOTOR_CONTROL_PIN PORTC,1

#define set_port_pin(port, pin) (port |= (1<<pin))

when I try to use this macro like this: set_port_pin(MOTOR_CONTROL_PIN);

I get preprocessor error, saying that set_port_macro expects 2 arguments and I pass only 1

When I rewrite the program and instead of defining macro set_port_pin I write a function

which does the same, the program compiles without error.

So the only reason for this I think is that preprocessor doesnt expand MOTOR_CONTROL_PIN macro

when it's used as parameter to another macro.

Any ideas?

Regards,

Giorgi Kvirkvia