Changes
This device is supported by [[FutureOS|FutureOS]]. The resolution of about 1500 * 1000 points is used.
== Source Code ==
<pre>
The following routines and descriptions are a part of FutureOS. All rights remain by Dr. Stefan W. Stumpferl. Free for private use.
If you want to use this routines or parts of them, them give credits to TFM of FutureSoft!
The original software uses other port addresses and routines, my solution is faster and compatible to all tested other hardware expansions, which is not the case for the original routines from Hegetron.
10.08.2009 - TFM of FutureSoft aka Dr. Stefan W. Stumpferl
Questions? Mail me: TFM@FutureOS.de
;TEST IF HEGOTRON GRAFPAD 2 IS CONNECTED
;
;Parameters given back
;
;A = (&00 und) Z-Flag gesetzt --> kein GP2 angeschlossen
; = (&01-05,) Z-Flag geleert --> GP2 ist angeschlossen
;
;Manipulated AF, BC
T_GP2 LD A,&02:LD BC,&F9F7:OUT (C),A:LD C,&FF:OUT (C),C:LD C,&F7:IN A,(C):INC A:RET
TEST IF HEGOTRON GRAFPAD 2 IS CONNECTED
=======================================
Short description: Test if the Hegotron Grafpad 2 is connected.
Jump in conditions: -
Jump out conditions: The Z80 register A reports if the Hegetron
Grafpad 2 is connected to the CPC or not.
A = &00 and zero flag is set ------> NO GP2 connected.
A = &01-05 and zero flag cleared --> the GP2 IS connected.
Manipulated: AF and BC.
Description: This routine tests if the Grafpad 2 from Hegotron is
connected to the CPC. You call the routine without any parameters.
After the return of T_GP2 the Z80 register A and the zero flag report
about the existence of the Grafpad 2.
If the routine returns with the value &00 in register A and with a set
zero flag, then the Grafpad 2 can't be found. Else if the routine
returns with A unqual to &00 and with a cleared zero flag, then the
Grafpad 2 is connected.
Example:
CALL T_GP2;test if Grafpad 2 is connected.
JR Z,NO_GP2 ;NO GP 2 connected!
GP2 ... ;the GP2 IS connected!
...
...
;SCANNING OF THE HEGOTRON GRAFPAD 2
;
;Parameters given back
;
;DE = Y coordinate &0000-&04FF (&001B-&0484)
;HL = X coordinate &0000-&05FF (&0020-&05DF) + Buttons E (7.Bit H), S (6.Bit H)
;Bit 7/6(H) = 0 --> key pressed, Bit = 1 --> NO key pressed
;
;Manipulated AF, BC, DE, HL, BC'
G_GP2 XOR A,A:LD BC,&F9F7:OUT (C),A ;OUT &F9F7,&00
EXX:LD BC,&F9FF:OUT (C),C:EXX ;OUT &F9FF,&FF
IN E,(C) ;yl=INP(&F9F7)
INC A:OUT (C),A:EXX:OUT (C),C:EXX:IN L,(C) ;xl
INC A:OUT (C),A:EXX:OUT (C),C:EXX:IN D,(C) ;yh
INC A:OUT (C),A:EXX:OUT (C),C:EXX:IN H,(C) ;xh
RET
SCANNING OF THE HEGOTRON GRAFPAD 2
==================================
Short description: Scanning of the X-, the Y-coordinates and both
buttons (E and S) of the Hegotron Grafpad 2.
Jump in conditions: -
Jump out conditions: The registers DE and HL report about the X- and
the Y-coordinates and the buttons E and S.
DE = Y-coordinate, theoretical: &0000-&04FF, in real: &001B-&0484
HL = X-coordinate, theoretical: &0000-&05FF, in real: &0020-&05DF
And register H contains the state of the buttons E (bit 7, MSB of H)
and S (bit 6 of H). For both buttons is valid, that a cleared bit
reports a pressed key. If a bit is set, the key is NOT pressed.
Manipulated: AF, BC, DE, HL and BC'
Description: If the CPC is connected to the Hegotron Grafpad 2 (you
MUST test this before!), then you can use this routine G_GP2 to scan
the actual coordinates of the graphic table pen and the status of the
buttons. When the routine returns DE contains the Y-coordinate of the
pen. Theoretically that can be a value between &0000 and &04FF. But in
reality the graphic tablet covers values between &001B and &0484.
(There can be differences between different units). Little Y values
are located at the bottom, near the user. Big Y values are located
upwards, away from the user. The register HL reports about the X
coordinate (bits 0-10) and the status of the buttons. The X coordinate
theoretical spans over values from &0000 up to &05FF. In reality the
values lie between &0020 and &05DF. Little X values are located left,
big X values are located right on the graphic tablet. Further the most
upper bits of register H (7 and 6) contain the status of both buttons
of the GP2. H encodes the buttons E (bit 7) and S (bit 6):
- If bit 7 is cleared to 0, the key E (Entry, Exit) IS pressed now.
If bit 7 is set to 1, the key E is actually NOT pressed.
- If bit 6 is cleared to 0, the key S (Select) IS pressed now.
If bit 6 is set to 1, the key S is actually NOT pressed.
Example:
CALL G_GP2 ;get Grafpad 2 coordinates and buttons.
LD (GP2_X_Koordinate),DE ;save X-coordinate into RAM
LD A,H
AND A,&C0 ;isolate bits 7 and 6 (= keys E and S),
LD (KEYS_E_AND_S),A) ;and save key status (??00 0000) to RAM
RES 7,H
RES 6,H
LD (GP2_Y_Koordinate),HL ;save Y-coordinate into RAM
...
Attention: Use this routine ONLY if you are sure that the Grafpad 2 IS
connected to the CPC. Use T_GP2 to test this (look before).
;SCANNING OF THE BUTTONS E AND S OF THE HEGOTRON GRAFPAD 2
;
;Parameters given back
;
;A (Bit 7) = button E / valid is...
;A (Bit 6) = button S / Bit = 0 --> key pressed, Bit = 1 --> NO key pressed
;
;Manipulated AF, BC
K_GP2 LD A,&03:LD BC,&F9F7:OUT (C),A:LD C,&FF:OUT (C),C:LD C,&F7:IN A,(C) ;yh
INC A:RET
SCANNING OF THE BUTTONS E AND S OF THE HEGOTRON GRAFPAD 2
=========================================================
Short description: Keys E and S of the Hegotron Grafpad 2 are scanned.
Label: K_GP2
ROM-number: D
Start address: &E73E
Jump in conditions: -
Jump out conditions: The register A reports if one of the two buttons
E (Entry, Exit) and / or S (Select) is pressed.
Register A bit 7 corresponds to key E.
Register A bit 6 corresponds to key S.
A cleared bit (0) symbolizes a pressed key, whereas a set bit (1)
symbolizes that the key is NOT pressed.
Manipulated: AF and BC.
Description: If the CPC is connected to the Hegotron Grafpad 2 (you
must test this before!), you can use this routine K_GP2 to investigate
the status of both keys.
After the return of the routine the status of the keys is encoded in
the two upper bits of register A; key E (bit 7) and key S (bit 6):
- If bit 7 is cleared to 0, the key E (Entry, Exit) IS pressed now.
If bit 7 is set to 1, the key E is actually NOT pressed.
- If bit 6 is cleared to 0, the key S (Select) IS pressed now.
If bit 6 is set to 1, the key S is actually NOT pressed.
Example:
CALL K_GP2 ;scan Grafpad 2 keys
AND A,&C0 ;isloate bits 7 and 6 (??00 0000)
LD (KEYS_E_AND_S),A) ;and save status of keys to RAM
...
Attention: Use this routine ONLY if you are sure that the Grafpad 2 IS
connected to the CPC. Use T_GP2 to test this (look before).
</pre>
== Reviews ==
