CipherLab 8 Series

54
CipherLab BASIC Programming Part I
ON KEY … GOSUB … 8000, 8200, 8300, 8400, 8700
Purpose To activate “KEY Event Trigger”.
Syntax ON KEY(number%) GOSUB SubName|SubLabel
Remarks “number%” is an integer variable.
 When “number%
” is an integer variable in the range of 1 to 12, it indicates
a function key (F1~F12) of the keypad.
 Call ON KEY(256+KeyCode%) to
trigger a key event by key code. Any key
will do as long as its key code can be read by INKEY$. Refer to
Key Code
Table.
“SubName|SubLabel” is the name or line label of a subroutine.
When a key is pressed, a specific subroutine will be executed.
ON KEY command allows a total of 12 key event trigger.
If more than 12 key events are required, you may reserve the last one for ON
KEY(256+255). When ON KEY(256+255
) is called, a key press can be used to
trigger execution
of a corresponding subroutine, as long as its key code is
found less than 0x20 or greater than 0x7F. Use INKEY$ and ASC to get the key
code, and parse key codes in the subroutine.
One key can be used to trigger execution of one subroutine. If a key is set
as a
event trigger using ON KEY(256+KeyCode%
), the same key cannot be used to
trigger the event of ON KEY(256+255
). Likewise, when ON ESC has been
activated, the ESC key cannot be used to trigger the event of ON
KEY(256+255).
Example (1)
REM Set KEY_F1 and KEY_F2 as event trigger
ON KEY(1) GOSUB On_Shift
ON KEY(2) GOSUB Off_Shift
…
On_Shift:
Mode$ = “IN”
RETURN
Off_Shift:
Mode$ = “OUT”
RETURN
Example (2)
REM Set KEY_F13 as event trigger
ON KEY(256+144) GOSUB KeyEvent
KeyEvent:
PRINT “KEY_F13 is pressed.”
RETURN