topic Re: Does the "@" symbol act as a pointer in header files for Registers? in CodeWarrior Development Tools

Does the "@" symbol act as a pointer in header files for Registers?

bpaehr — Mon, 22 Aug 2016 17:33:30 GMT

I'm using CodeWarrior 10.6.4 for an MC9S08QB8 device. I'm fairly new to using the C-Language with micros, but I'm getting there.

A question has arisen from a colleague of mine who has used C much longer than me. In particular, I reference Page 40 of the "Getting Started with HCS08 and CodeWarrior Using C, Rev. 2" document. On that page there is a reference to using the "@" symbol as an "absolute address" to location $0065. In trying to help me with my own understanding of how registers are accessed, he doesn't understand how the "@" symbol is used in the typical device headers (as indicated on Page 40). He has tried to implement the "@" symbol in his own C-Development environment for one of his own projects (not CodeWarrior), but it was not acceptable there.

How does CodeWarrior/Eclipse treat the "@" symbol? What is it's meaning? Is it related to pointers?

Re: Does the "@" symbol act as a pointer in header files for Registers?

ZhangJennie — Wed, 24 Aug 2016 03:56:49 GMT

Hi,

"Global Variable Address Modifier @ " is only for CW for 8/16bit MCU.

it is used for assign global variables to specific addresses .

for more information, please see attached doc.

if you have question after reading the doc, please feel free to post here.

Have a great day,
Jennie Zhang

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Re: Does the "@" symbol act as a pointer in header files for Registers?

bpaehr — Wed, 24 Aug 2016 12:30:35 GMT

Thank you, Jennie.

Bob