34 lines
1.3 KiB
Forth
Executable File
34 lines
1.3 KiB
Forth
Executable File
\ ############################################################################
|
|
\ # toggle.fth - This program starts up a Forth cog that toggles P15
|
|
\ #
|
|
\ # Copyright (c) 2012 Dave Hein
|
|
\ # MIT Licensed
|
|
\ ############################################################################
|
|
|
|
create cogstack 80 allot \ Allocate data stack space
|
|
create cogreturn 80 allot \ Allocate return stack space
|
|
create delaycnt 80000000 , \ This variable controls the blink rate
|
|
|
|
hex
|
|
\ This word toggles bit P15 every "delaycnt" cycles
|
|
: toggle
|
|
8000 dirasetbit cnt@ \ Set P15 for output and get CNT
|
|
begin
|
|
delaycnt @ + waitcnt \ Wait "delaycnt" cycles
|
|
8000 outasetbit \ Set P15
|
|
delaycnt @ + waitcnt \ Wait "delaycnt" cycles
|
|
8000 outaclrbit \ Clear P15
|
|
again ; \ Repeat forever
|
|
decimal
|
|
|
|
create cogconfig \ Forth cog config structure
|
|
' toggle >body , \ Get execution token for TOGGLE
|
|
cogstack , \ Initial value of stack ptr
|
|
cogstack , \ Empty value for stack ptr
|
|
cogreturn , \ Initial value of return ptr
|
|
cogreturn , \ Empty value for return ptr
|
|
|
|
\ This word starts a cog running the TOGGLE word
|
|
: starttoggle forth @ cogconfig cognew ;
|
|
|