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This example gives you the chance to explore the differences between signed and unsigned integer numbers, and between fixed field width and variable field width integer formats.
We will make a program that uses the MMi99 front panel buttons to increment a number by 1 or by 10. The buttons will be assigned, from top to bottom, as "+10", "+1", 0 (clear the count), "-1" and "-10". The resulting number will be displayed in all 4 integer formats. The screen layout will be:
0123456789012345 (ruler line)
UFW:999;SFW:-999
UVW:999;SVW:-999
For example, with the number 23 the display should be:
0123456789012345 (ruler line)
UFW: 23;SFW: 23
UVW:23 ;SVW:23
In all cases the actual display field is bounded by punctuation marks or the end of the line. If you are using an LCD with more than 16 columns, take it as an exercise to modify the program to add a semicolon after the second number on each line.
Here is the program:
;Integer count on LCD. Example from onboard LCD documentation
iPlus10 iEQU 12
iPlus1 iEQU 11
iZero iEQU 10
iMinus1 iEQU 9
iMinus10 iEQU 8
Counter mEQU 0
OBLCD_Type 2 ;initialize the LCD
Loop
InputK iPlus10 ;Test a button
GoIfT Add10
InputK iPlus1 ;Test a button
GoIfT Add1
InputK iZero ;Test a button
GoIfT Clear
InputK iMinus10 ;Test a button
GoIfT Sub10
InputK iMinus1 ;Test a button
GoIfT Sub1
GoTo Loop
Add10
Recall Counter
IncX
IncX
IncX
IncX
IncX
IncX
IncX
IncX
IncX
IncX
Store Counter
GoTo Display
Add1
Recall Counter
IncX
Store Counter
GoTo Display
Sub10
Recall Counter
DecX
DecX
DecX
DecX
DecX
DecX
DecX
DecX
DecX
DecX
Store Counter
GoTo Display
Sub1
Recall Counter
DecX
Store Counter
GoTo Display
Clear
SetMem Counter,0
;Fall through
Display
OBLCD_SetCur 0,0
; "0123456789012345"
OBLCD_Text "UFW: ;SFW: "
OBLCD_SetCur 1,0
; "0123456789012345"
OBLCD_Text "UVW: ;SVW: "
OBLCD_SetCur 0,4
Recall Counter
OBLCD_UDecDispXFW
OBLCD_SetCur 0,12
Recall Counter
OBLCD_SDecDispXFW
OBLCD_SetCur 1,4
Recall Counter
OBLCD_UDecDispXVW
OBLCD_SetCur 1,12
Recall Counter
OBLCD_SDecDispXVW
GoTo Loop
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