I'm in the process of porting a graphics library downloaded from avrfeaks.net from AVR Assembler to avr-as.
I'm now getting undefined references to PC. Does GAS not have a PC symbol defined? Can anyone point me to something that I'm doing wrong that would keep PC from not being defined? Can anyone suggest a work- around?
Thanks,
I know nothing about WINAVR, but PC is normally used to refer to the ProgramCounter. I suggest you read the source and see if this makes sense.
I just went through the user manual and didn't see a reference to PC, this despite a heckuva lot of windows stuff in there. When I read the original post, I was worried that winavr was going to make itself unaware of its own operating system. I think 'PC' is undefined in winavr.
Are there any instructions that allow you to access the PC directly in any case?
The PC (program counter) register is sometimes referred to as IP (instruction pointer). Same thing, different mnemonic traditions --- gas mostly follows the AT&T assembly syntax rather than the Intel assembly syntax, but I think for register names gas tries to follow the chip vendor's conventions, whatever they are for that particular CPU.
But as Richard/FreeRTOS says, is the PC (or IP) register even visible on AVRs? I don't think it is. What's the instruction you're running into trouble with?
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