topic using the '@' directive , to assign a variable to specific address in MQX Software Solutions

using the '@' directive , to assign a variable to specific address

lel_chen — Tue, 11 Aug 2009 13:55:15 GMT

Hi,

To assign a variable to a specific addresses, I tried using the '@' directive as given below:

int glob @0x0500 = 10;

This gives a compiler error which says:

"Expected ; instead of '@' ".

I tried with the C99 & GCC extensions enabled in c/C++ Language settings tab. This did not help.

Any solutions?

Thanks,

Chen

CarlFST60L — Wed, 12 Aug 2009 05:00:33 GMT

This thread really has nothing to do with MQX

Firstly, you should define the varible as global i.e. outside your code body in the following format

volatile type name @0xADDRESS;

//Example copied from one of my 8 bit processors I happen to have open

volatile unsigned char __far NV_ICSTRM_FAR @0x0000FFBE;

You could always check the header files for definitions of the standard ports and copy those

Message Edited by CarlFST60L on 2009-08-11 11:21 PM

lel_chen — Wed, 12 Aug 2009 11:11:08 GMT

Thank You,

I hadnt declared it as a global - that was the mistake.

Thanks,

Chen