User`s manual

Dynamic C User’s Manual digi.com 337

APPENDIX A. MACROS AND GLOBAL

VARIABLES

This appendix contains descriptions of macros and global variables available in Dynamic C. This is not an

exhaustive list.

A.1 Macros Defined by the Compiler

The macros in the following table are defined internally. Default values are given where applicable, as well

as directions for changing values.

Table A-1. Macros Defined by the Compiler

Macro Name Definition and Default

_BIOSBAUD_

This is the debug baud rate. The baud rate can be changed in the

Communications tab of Project Options.

_BOARD_TYPE_

This is read from the System ID block or defaulted to 0x100 (the

BL1810 JackRabbit board) if no System ID block is present. This can be

used for conditional compilation based on board type. Board types are

listed in boardtypes.lib.

_CPU_ID_

This macro identifies the CPU type, including its revision; e.g.,

#if _CPU_ID_ >= R3000_R1

will identify a Rabbit 3000 rev. 1 or newer chip

Look in \Lib\..\BIOSLIB\sysiodefs.lib for the constants

and mask macros that are defined for use with _CPU_ID_.

CC_VER Gives the Dynamic C version in hex, i.e., version 7.05 is 0x0705.

DC_CRC_PTR Reserved.

__DATE__

The compiler substitutes this macro with the date that the file was

compiled (either the BIOS or the .c file). The character string literal is of

the form Mmm dd yyyy. The days of the month are as follows: "Jan,"

"Feb," "Mar," "Apr," "May," "Jun," "Jul," "Aug," "Sep," "Oct," "Nov,"

"Dec."

There is a space as the first character of dd if the value is less than