CodeWarrior for MCU中的主题 Re: #define register

#define register

elee40 — Thu, 29 Nov 2007 00:44:58 GMT

I am using a freescale hc12 with codewarrior and trying to use a #define to refer to a memory register but continue to receive an error. The error I get is

C2450: Expected ~ (IDENT auto const extern register static typedef volatile__interrupt friend inline operator virtual) . I realize that these definitions are already in the header files....But for educational purposes I am trying to define my own references to the memory registers. Any help or suggestions would be much appreciated.

#include <hidef.h> /* common defines and macros */
#include <mc9s12dt256.h> /* derivative information */
#pragma LINK_INFO DERIVATIVE "mc9s12dt256b"

#define EPCNT 0x000000AC
EPCNT = 0;

Thanks

Erik

Re: #define register

joeservo — Thu, 29 Nov 2007 04:44:25 GMT

try something like this:

#define PORTA (*((volatile unsigned char*) (0x0000)))

what you are doing is only defining the number to a word.

you will probably get a link error about duplicate register names. i usually change that to a warning and ignore.

Re: #define register

elee40 — Fri, 30 Nov 2007 03:10:21 GMT

Still getting error C2450: Expected: ~ (IDENT operator . Also getting error C1067: Object is missing decl specifiers. I looked at the help under these errors, but as I am not the greatest programmer the explanation was not clear.

#include <hidef.h> /* common defines and macros */
#include <mc9s12dt256.h> /* derivative information */
#pragma LINK_INFO DERIVATIVE "mc9s12dt256b"

#define EPWM (*((volatile unsigned char*) (0x000000AC)))
EPWM = 0;

Erik

Re: #define register

elee40 — Fri, 30 Nov 2007 03:13:03 GMT

Ignore my previous message. It works as long as I assign a value to the memory register inside of main(). Thanks again. Erik