Constants

Constants are just a pattern file $(CONSTANTS_PAT) where the project constants are saved. This file can be modified at any time and is read when make all is entered.

Note: search and replace is a complex process, and Gema is not trivial. To use Gema well one must read all the Gema notes and examples.

Basic Rules

• Comment - '!'
• Search Term - whatever is on the left of the equal sign
• Replacement Term - whatever is on the right of the equal sign
• '%' - Forth symbol for binary

$(CONSTANTS_PAT)

! MODER
INPUT=%00
OUTPUT=%01
AF=%10
ANALOG=%11

! ALTERNATE FUNCTION
AF0=%0000  
AF1=%0001 
AF2=%0010  
AF3=%0011  
AF4=%0100 
AF5=%0101  
AF6=%0110  
AF7=%0111

! OTYPER
PUSH-PULL=0
OPEN-DRAI=1

! PUPDR  
NO-PULL=%00	! No pull-up or pull-down
PULL-UP=%01
PULL-DOWN=
! ( 11: Reserved )! MODER
INPUT=%00
OUTPUT=%01
AF=%10
ANALOG=%11

! ALTERNATE FUNCTION
AF0=%0000  
AF1=%0001 
AF2=%0010  
AF3=%0011  
AF4=%0100 
AF5=%0101  
AF6=%0110  
AF7=%0111

! OTYPER
PUSH-PULL=0
OPEN-DRAI=1

! PUPDR  
NO-PULL=%00	! No pull-up or pull-down
PULL-UP=%01
PULL-DOWN=
! ( 11: Reserved )

! OSPEEDR
LOW-SPEED=%00
MEDIUM-SPEED=%01
HIGH-SPEED=%11

! OSPEEDR
LOW-SPEED=%00
MEDIUM-SPEED=%01
HIGH-SPEED=%11