Having trouble accessing C variable from asm section

gonzaloalcaraz — Fri, 20 Jan 2017 16:10:35 GMT

Hey. I'm implementing a simple fifo in a project of mine, and am getting both a "C18125 Invalid opcode or ':' expected" and a "C18000 Label not set" errors on third line of the following section of code:

unsigned char SaveCCR; //preserve CCR
asm tpa
asm staa SaveCCR
asm sei // make atomic by disabling interrupts

Tried adding the ':' at the front of the variable name, but I just get another error and I have no idea what Im doing. Other asm instructions work fine, it seems the syntax is incorrect for accessing variables. I couldn't find why this syntax is wrong anywhere.

Any help is very appreciated!

Re: Having trouble accessing C variable from asm section

ZhangJennie — Sun, 22 Jan 2017 02:45:10 GMT

Hi Gonzalo,

I ever made a small sample code to you. see attached “mix_C_Assembly_HCS12X”

XDEF specifies labels defined in the current module but can be referenced by other modules.

XREF specifies symbols referenced in the current module but defined in another module

variable "my_C_variable" is accessed by assembly code in this demo.

Have a great day,
Jennie Zhang

-----------------------------------------------------------------------------------------------------------------------
Note: If this post answers your question, please click the Correct Answer button. Thank you!
-----------------------------------------------------------------------------------------------------------------------

topic Having trouble accessing C variable from asm section in CodeWarrior for MCU

Having trouble accessing C variable from asm section

Re: Having trouble accessing C variable from asm section