Mercurial > hg > Members > kono > nitros9-code
view level2/modules/keydrv_cc3.asm @ 1328:4f37bc455854
Fixed some comments
| author | boisy |
|---|---|
| date | Fri, 05 Sep 2003 17:45:35 +0000 |
| parents | 5dd56f2f45b4 |
| children | b3caa1b456ed |
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******************************************************************** * KeyDrv - Keyboard Driver for CoCo 3 * * $Id$ * * Edt/Rev YYYY/MM/DD Modified by * Comment * ------------------------------------------------------------------ * 4 1998/10/10 Robert Gault * L2 Upgrade distribution version with annotations by Robert Gault. nam KeyDrv ttl Keyboard Driver for CoCo 3 * Disassembled 98/09/09 09:02:10 by Disasm v1.6 (C) 1988 by RML ifp1 use defsfile endc tylg set Systm+Objct atrv set ReEnt+rev rev set $00 edition equ 4 mod eom,name,tylg,atrv,entry,size size equ . name fcs /KeyDrv/ fcb edition entry equ * * Init - Initialize keyboard lbra Init * Term - Terminate keyboard lbra Term * Function - Test for function keys lbra FuncKeys * Read - read keys if pressed ReadKys ldu <D.CCMem Get CC3IO global memory into U ldx #PIA0Base base address of PIA #0 clrb comb stb $02,x clear all strobe lines ldb ,x read PIA #0 comb bit values 0=off 1=on andb #%00001111 keep only buttons bne L0059 branch if button pushed; error routine clr $02,x enable all strobe lines lda ,x read PIA #0 coma anda #%01111111 mask only the joystick comparator beq L0042 branch if no keys pressed pshs dp tfr u,d tfr a,dp set DP to the address in regU bsr L005C evaluate the found key matrix puls dp return to system DP bpl L005B valid key L0042 clra regA would have been the found key ldb <G.CapLok,u CapsLock/SysRq key down flag bne L0056 clr <G.KTblLC,u Key table entry# last checked (1-3) coma comb sta <G.LKeyCd,u last keyboard code sta <G.2Key1,u 2nd key table storage; $FF=none std <G.2Key2,u format (Row/Column) L0056 clr <G.CapLok,u see above L0059 ldb #$FF L005B rts L005C ldx #PIA0Base base value of PIA #0 ifne H6309 clrd else clra clrb endc std <G.ShftDn shift/CTRL flag; 0=NO $FF=YES std <G.KeyFlg PIA bits/ALT flag * %00000111-Column # (Output, 0-7) * %00111000-Row # (Input, 0-6) ifne H6309 comd else coma comb set primary key table endc std <G.Key1 key 1&2 flags $FF=none sta <G.Key3 key 3 ² deca ie. lda #%11111110 sta $02,x strobe one column L006E lda ,x read PIA #0 coma anda #$7F keep only keys, bit 0=off 1=on beq L0082 ldb #$FF preset counter to -1 L0077 incb lsra bit test regA bcc L007E no key so branch lbsr L010E convert column/row to matrix value and store it L007E cmpb #$06 max counter bcs L0077 loop if more bits to test L0082 inc <G.KeyFlg counter; used here for column orcc #Carry bit marker; disable strobe rol $02,x shift to next column bcs L006E not finished with columns so loop lbsr L0166 simultaneous check; recover key matrix value bmi L00F5 invalid so go cmpa <G.LKeyCd last keyboard code bne L0095 inc <G.KySame same key flag ?counter? L0095 sta <G.LKeyCd setup for last key pressed beq L00B5 suba #$1A the key value (matrix) of Z bhi L00B5 not a letter so go adda #$1A restore regA ldb <G.CntlDn CTRL flag bne L00E0 CTRL is down so go adda #$40 convert to ASCII value; all caps ldb <G.ShftDn shift key flag ldy <G.CurDev get current device static memory pointer eorb <ULCase,y caps lock and keyboard mouse flags andb #CapsLck test caps flag bne L00E0 not shifted so go adda #$20 convert to ASCII lower case bra L00E0 * key is not a letter; this routine is not based on some underlining principle of * the keyboard hardware. It is also a function of the decode table at $1DC,pcr. L00B5 ldb #$03 mul regB = (key#-26) times 3 lda <G.ShftDn shift key flag beq L00BF not shifted so go incb bra L00C5 L00BF lda <G.CntlDn CTRL flag beq L00C5 addb #$02 L00C5 ldx <G.CurDev point X to device's static memory lda <$22,x key sense flag beq L00D0 not set so go cmpb #$11 spacebar ble L00F3 must be an arrow so go L00D0 cmpb #$4C SHIFTed ALT key blt L00D8 not ALT, CTRL, F1, F2, or SHIFT so go inc <G.AltDwn flag special keys (ALT,CTRL) subb #$06 L00D8 leax >L01DC,pcr decode table lda b,x bmi L00F6 if regA = $81 - $84 * several entries to this routine from any key press; regA is already ASCII L00E0 ldb <G.AltDwn was ALT flagged? beq L00F0 no so go cmpa #$3F ? bls L00EE # or code cmpa #$5B [ bcc L00EE capital letter so go ora #$20 convert to lower case L00EE ora #$80 set for ALT characters L00F0 andcc #^Negative not negative rts L00F3 orcc #Negative set negative L00F5 rts L00F6 inc <G.CapLok caps lock/SysRq inc <G.Clear one shot caps lock/SysRq bra L00F0 L00FC pshs b,a convert column into power of 2 clrb orcc #Carry inca L0102 rolb deca bne L0102 bra L0108 WHY IS THIS HERE?? L0108 orb <G.KySns previous value of column stb <G.KySns puls pc,b,a L010E pshs b,a cmpb #$03 is it row 3? bne L011C lda <G.KeyFlg get column # cmpa #$03 is it column 3?; ie up arrow blt L011C if lt must be a letter bsr L00FC its a non letter so bsr L011C lslb B*8 8 keys per row lslb lslb addb <G.KeyFlg add in the column # cmpb #$33 ALT bne L012B inc <G.AltDwn ALT down flag ldb #$04 bra L0108 L012B cmpb #$34 CTRL bne L0135 inc <G.CntlDn CTRL down flag ldb #$02 bra L0108 L0135 cmpb #$37 SHIFT key bne L013F com <G.ShftDn SHIFT down flag ldb #$01 bra L0108 * check how many key (1-3) are currently being pressed L013F pshs x leax <$2D,u 1st key table bsr L014A puls x puls pc,b,a L014A pshs a lda ,x bpl L0156 stb ,x ldb #$01 puls pc,a L0156 lda $01,x bpl L0160 stb $01,x ldb #$02 puls pc,a L0160 stb $02,x ldb #$03 puls pc,a * simlutaneous key test L0166 pshs y,x,b ldb <G.KTblLC key table entry # beq L019D leax <$2A,u point to 2nd key table pshs b L0171 leay <$2D,u 1st key table ldb #$03 lda ,x get key #1 bmi L018F go if invalid? (no key) L017A cmpa ,y is it a match? bne L0184 go if not a matched key clr ,y com ,y set value to $FF bra L018F L0184 leay $01,y decb bne L017A lda #$FF sta ,x dec <G.KTblLC key table entry# L018F leax $01,x dec ,s column counter bne L0171 leas $01,s ldb <G.KTblLC key table entry (can test for 3 simul keys) beq L019D bsr L01C4 L019D leax <$2D,u 1st key table lda #$03 L01A2 ldb ,x+ bpl L01B5 deca bne L01A2 ldb <G.KTblLc key table entry (can test for 3 simul keys) beq L01C0 decb leax <$2A,u 2nd key table lda b,x bra L01BE L01B5 tfr b,a leax <$2A,u 2nd key table bsr L014A stb <G.KTblLC L01BE puls pc,y,x,b L01C0 orcc #Negative flag negative puls pc,y,x,b L01C4 leax <$2A,u bsr L01CF leax $01,x bsr L01CF leax -$01,x L01CF lda ,x bpl L01DB ldb $01,x bmi L01DB sta $01,x stb ,x L01DB rts * These seem to be special key combination values; 3 per key in ASCII *L01DC fcb @,shift@,nul * fcb up,shifted,CTRL * fcb down, shifted, CTRLed * fcb left, shifted, CTRLed * fcb right, shifted, CTRLed * fcb spacebar, spacebar, spacebar * fcb ~0,~0,$81 signal shiftlock change * fcb ~1,~!,~| * fcb ~2,~”,null * fcb ~3,~#,~~ * fcb ~4,~$,null * fcb ~5,~%,null * fcb ~6,~&,null * fcb ~7,~~,~^ * fcb ~8,~(,~[ * fcb ~9,~),~] * fcb ~:,~*,null * fcb ~;,~+,DEL * fcb ~,,~<,~{ * fcb ~-,~=,~_ * fcb ~.,~>,~} * fcb ~/,~?,~\ * fcb ENTER,ENTER,ENTER * I think these are for ALT * fcb $82,$83,$84 * fcb ENQ,BREAK,ESC * the next I think are for the F1 and F2 keys * fcb ~1,~3,~5 * fcb ~2,~4,~6 L01DC fdb $4060,$000c,$1c13,$0a1a,$1208,$1810,$0919,$1120 fdb $2020,$3030,$8131,$217c,$3222,$0033,$237e,$3424 fdb $0035,$2500,$3626,$0037,$275e,$3828,$5b39,$295d fdb $3a2a,$003b,$2b7f,$2c3c,$7b2d,$3d5f,$2e3e,$7d2f fdb $3f5c,$0d0d,$0d82,$8384,$0503,$1b31,$3335,$3234 fcb $36 * Init and Term do nothing for this CoCo keyboard subroutine module Init Term clrb rts * This entry point tests for the F1/F2 function keys on a CoCo 3 * keyboard. * Exit: A = Function keys pressed (Bit 0 = F1, Bit 2 = F2) FuncKeys ldu <D.CCMem get CC3IO global mem pointer into U ldx #PIA0Base get address of PIA #0 clra clear A ldb #%11011111 strobe column #6 of PIA #0 stb $02,x ldb ,x read PIA #0 bitb #%01000000 test for F1 function key bne CheckF2 branch if set (key not down) inca flag F1 as down CheckF2 ldb #%10111111 strobe column #7 PIA #0 stb $02,x ldb ,x read PIA #0 bitb #%01000000 test for F2 function key bne L024C ora #$04 flag F2 as down L024C rts emod eom equ * end