Mercurial > hg > Members > kono > nitros9-code
annotate level2/modules/joydrv_6551L.asm @ 2926:53961f90b9dd
d64/makefile: Stop building if error in subdirectory build
| author | Tormod Volden <debian.tormod@gmail.com> |
|---|---|
| date | Sat, 18 Jan 2014 09:54:17 +0100 |
| parents | 28ed72477814 |
| children |
| rev | line source |
|---|---|
| 0 | 1 ******************************************************************** |
| 2 * JoyDrv - Joystick Driver for 6551/Logitech Mouse | |
| 3 * | |
| 4 * $Id$ | |
| 5 * | |
| 1846 | 6 * Edt/Rev YYYY/MM/DD Modified by |
| 7 * Comment | |
| 0 | 8 * ------------------------------------------------------------------ |
| 1846 | 9 * 6 1988/??/?? |
| 10 * L2 Upgrade distribution version. | |
| 11 * | |
| 12 * 6r1 2005/04/25 Boisy G. Pitre | |
| 13 * Fixed error where wrong branch was taken. | |
| 2371 | 14 |
| 15 * GH 08/06/2008 gleaned from a newsgroup msg found by google | |
| 16 *--------------------------------------------- | |
| 17 *> Hmm, let me guess: the terminal used a 6551 ACIA. | |
| 18 * | |
| 19 * Possibly so, but not necessarily. Seems there are terminals out there | |
| 20 * that require DCD/DSR/strange signals for receiving/transmitting. Choose | |
| 21 * any combination you like. | |
| 22 * | |
| 23 * Now, the ACIA 6551 is an especially braindead beast. It requires both | |
| 24 * DCD and DSR, and pulling CTS low for flow control will make it stop | |
| 25 * sending immediately, without finishing the character, resulting in a | |
| 26 * junked character. (Not all versions of the chip have this bug. Most do.) | |
| 27 * The Archimedes people who were struck with the 6551 usually wired DCD | |
| 28 * and CTS to high, DSR to modem CTS, RI to modem DCD. | |
| 29 *---------------------------------------------- | |
| 30 * FWIW, the mouse outputs a packet of un-determined length when | |
| 31 * it is enabled, no motion needed to trigger, just turn it on | |
| 32 * Since the mouse is port powered, enabling its power could | |
| 33 * cause this I presume. | |
| 34 * GH 21/06/08 my mouse is fixed at 3 bytes | |
| 35 * GH see comments scattered through the code | |
| 36 * none of which will be precious in final | |
| 37 * version | |
| 38 * GH - 21/12/09 version 11 (B) moving some code to shrink, rechecking | |
| 39 * GH - 18/12/09 version A - trying to fix button locations in packet | |
| 40 * GH - 30/06/2008 version 8 | |
| 41 * GH - 08/08/2008 version 7 | |
| 42 * Re-wrote to rearrange order of init see | |
| 43 * comments scattered through the code | |
| 44 * GH - 01/07/2008 version 9 | |
| 45 * added code to function with a real M$ 3 button mouse | |
| 46 * now defaults to M$ empty packet for Center button down event | |
| 47 * but detects 4th byte from a Logitek mouse & switches modes | |
| 48 * till next reboot. | |
| 49 * Also no 6309 optimizations yet. Version A maybe? Not yet. | |
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50 |
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51 * damn this editor, it lets me open a file, do an hours worth of |
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52 * hacking on a file I don't own, but the sumbitch doesn't tell |
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53 * me until I go to save an hours work! So I have to re-invent |
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54 * this wheel every damned time. |
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55 |
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56 * Now we start on version 13 |
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57 * GH 2012/11/01 trying to make this work again, it died with |
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58 * the conversion to a mercurial repo on srcfrg. |
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59 |
| 2371 | 60 * one problem has been the narrow list format, Boisy advises: |
| 61 opt w132 | |
| 62 nam JoyDrv | |
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63 ttl Joystick Driver for 6551/Logitech or M$ Mouse |
| 2371 | 64 |
| 0 | 65 * Disassembled 98/09/09 09:22:44 by Disasm v1.6 (C) 1988 by RML |
| 2371 | 66 |
| 67 ifp1 | |
| 68 use defsfile | |
| 69 use l51.defs | |
| 70 endc | |
| 71 * l51.defs - something else to check against google et all | |
| 72 * l51.defs has been modified, this needs the new version | |
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73 * set this to get some debugging and a lockup in the boot trace |
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74 DEBUG = 0 |
| 0 | 75 tylg set Systm+Objct |
| 2371 | 76 atrv set ReEnt+rev |
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77 rev set $01 |
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78 edition set 13 |
| 2371 | 79 * set this to where your rs-232 pack is plugged in |
| 80 MPISlot set $00 front slot for mine | |
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81 * the $FF6C is the mouses port address, change to suit your system. |
| 2371 | 82 mod eom,name,tylg,atrv,start,$FF6C |
| 83 | |
| 84 name fcs /JoyDrv/ | |
| 85 fcb edition | |
| 86 | |
| 87 SlotSlct fcb MPISlot | |
| 88 | |
| 89 start lbra Init | |
| 90 lbra Term | |
| 91 lbra SSMsBtn | |
| 92 lbra SSMsXY | |
| 93 lbra SSJoyBtn | |
| 94 | |
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95 * This code is not being used as we have SSMsXY, but save it so I |
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96 * don't have to reinvent this wheel later but no clue why |
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97 * so it will die in next Edition 14 if not sooner. GH. |
| 2371 | 98 *SSJoyXY pshs x,b,a |
| 99 * ldx #PIA0Base | |
| 100 * lda <$23,x | |
| 101 * ldb <$20,x | |
| 102 * pshs b,a | |
| 103 * anda #$F7 | |
| 104 * sta <$23,x | |
| 105 * lda $01,x | |
| 106 * ldb $03,x | |
| 107 * pshs b,a | |
| 108 * andb #$F7 | |
| 109 * lsr $04,s | |
| 110 * bcs L0043 | |
| 111 * orb #$08 | |
| 112 *L0043 stb $03,x | |
| 113 * lda ,s | |
| 114 * ora #$08 | |
| 115 * bsr L0065 | |
| 116 * std $06,s | |
| 117 * lda ,s | |
| 118 * anda #$F7 | |
| 119 * bsr L0065 | |
| 120 * std $04,s | |
| 121 * puls b,a | |
| 122 * sta $01,x | |
| 123 * stb $03,x | |
| 124 * puls b,a | |
| 125 * stb <$20,x | |
| 126 * sta <$23,x | |
| 127 * puls pc,y,x | |
| 128 *L0065 sta $01,x | |
| 129 * lda #$7F | |
| 130 * ldb #$40 | |
| 131 * bra L0078 | |
| 132 *L006D lsrb | |
| 133 * cmpb #$01 | |
| 134 * bhi L0078 | |
| 135 * lsra | |
| 136 * lsra | |
| 137 * tfr a,b | |
| 138 * clra | |
| 139 * rts | |
| 140 *L0078 pshs b | |
| 141 * sta <$20,x | |
| 142 * tst ,x | |
| 143 * bpl L0085 | |
| 144 * adda ,s+ | |
| 145 * bra L006D | |
| 146 *L0085 suba ,s+ | |
| 147 * bra L006D | |
| 148 | |
| 149 IRQPckt equ * | |
| 150 Pkt.Flip fcb Stat.Flp D.Poll flip byte=$00 | |
| 151 Pkt.Mask fcb Stat.RxF is correct | |
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152 fcb $01 priority=low, mouse is pretty slow |
| 2371 | 153 |
| 1846 | 154 *** |
| 155 * JoyDrv Initialization. | |
| 156 * | |
| 157 * INPUT: U = JoyDrv data area address (8 bytes) | |
| 158 * | |
| 159 * OUTPUT: IRQ service entry installed | |
| 160 * D, X, and U registers may be altered | |
| 161 * | |
| 162 * ERROR OUTPUT: CC = Carry set | |
| 163 * B = error code | |
| 2371 | 164 * first, suspend all interrupts |
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165 Init pshs cc save regs we alter, stack -1 |
| 2371 | 166 orcc #IntMasks mask IRQs while disabling ACIA |
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167 bsr InitPIAs stack still -1 |
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168 bsr InitGIME stack still -1 |
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169 * we should see a bunch of stuff here, ending in 'D' |
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170 lbsr ClrACIA reset, clear trash data in ACIA, stack -1 on rtn |
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171 bcc SetBuf which will also install IRQSvs stack -1 yet |
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172 bcc Alldone else stack still -1 |
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173 lbra Term it won't come back! |
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174 Alldone puls cc,pc and return clean |
| 2371 | 175 |
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176 *****SetBuf************************** |
| 2371 | 177 * Btn.Cntr,u offset 0 has room for 3 bits of incoming |
| 178 * byte counter, 3 bits of button status. | |
| 179 * Buffer, offset 2-3 is the combined first 3 bytes | |
| 180 * of the incoming XY data | |
| 181 * CrntXpos, offset 4-5 is current (0-HResMaxX) xpos | |
| 182 * CrntYpos, offset 6-7 is current (0 to HResMaxY*2) ypos | |
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183 SetBuf lda #$00 |
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184 ldb #'M set Buffer,u to M$ mode |
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185 std Btn.Cntr,u set up Rx data sync, no button(s) pressed |
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186 clrb |
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187 std CrntXPos,u set up X position at left screen edge |
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188 ldd #HResMaxY*2 =$017E, 382 decimal? Odd value, check |
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189 std CrntYPos,u set up Y position at top screen edge |
| 2371 | 190 * Now we should be ready for live IRQ's |
| 191 InstIRQ ldd M$Mem,pcr get base hardware address | |
| 0 | 192 addd #StatReg status register address |
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193 pshs x,y |
| 0 | 194 leax IRQPckt,pcr |
| 195 leay IRQSvc,pcr | |
| 2371 | 196 os9 F$IRQ install the IRQSvs routine |
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197 puls x,y |
| 2371 | 198 lbcs InitErr go with cc on stack! |
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199 * Now, enable rx Rx IRQ's |
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200 ldx M$Mem,pcr but first clean out any instant IRQ's |
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201 lda DataReg,x dump it to the bitbucket |
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202 lda StatReg,x likewise, clear any irq's pending |
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203 * Now, enable the IRQ's |
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204 ldd #(TIC.RTS!Cmd.DTR)*256+(DB.7!Ctl.RClk!BR.01200) enable rx IRQs |
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205 std CmdReg,x and enable Rx IRQ's |
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206 puls cc Fix the stack! |
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207 rts so stack = 0 now |
| 2371 | 208 |
| 209 * BUG FIX: InitExit is now here... was TermExit... | |
| 210 InitExit puls pc,cc recover original regs, return... | |
| 211 | |
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212 * clear the PIA's for this, stack is -3 on entry |
| 2371 | 213 InitPIAs lda >PIA1Base+3 get PIA CART* input control register |
| 214 anda #$FC clear PIA CART* control bits | |
| 0 | 215 sta >PIA1Base+3 disable PIA CART* FIRQs |
| 216 lda >PIA1Base+2 clear possible pending PIA CART* FIRQ | |
| 2371 | 217 ifeq DEBUG-1 |
| 218 pshs a,b,x,u,y,cc,dp | |
| 219 lda #'P | |
| 220 jsr <D.BtBug | |
| 221 puls a,b,x,u,y,cc,dp | |
| 222 endc | |
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223 rts stack still -1 |
| 2371 | 224 |
| 225 InitGIME lda #$01 GIME CART* IRQ enable | |
| 0 | 226 ora <D.IRQER mask in current GIME IRQ enables |
| 227 sta <D.IRQER save GIME CART* IRQ enable shadow register | |
| 228 sta >IrqEnR enable GIME CART* IRQs | |
| 2371 | 229 lda SlotSlct,pcr mpi slot of mouse |
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230 bmi ClrACIA if no mpi |
| 2371 | 231 sta >MPI.Slct |
| 232 ifeq DEBUG-1 | |
| 233 pshs a,b,x,u,y,cc,dp | |
| 234 lda #'G | |
| 235 jsr <D.BtBug | |
| 236 puls a,b,x,u,y,cc,dp | |
| 237 endc | |
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238 rts And stack still -1 |
| 2371 | 239 |
| 240 ClrACIA ldx M$Mem,pcr get base hardware address again | |
| 241 lda #$10 | |
| 242 sta StatReg,x reset again | |
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243 * start it up with rx IRQs disabled |
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244 ldd #(TIC.RTS!Cmd.DTR!Cmd.RxIE)*256+(DB.7!Ctl.RClk!BR.01200) [D]=command:control |
| 2371 | 245 std CmdReg,x set command and control registers |
| 246 * do instant reads for trash collection | |
| 247 * and clear status of Stat.RxF bits | |
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248 * read it 32 times so its settled! |
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249 * and get rid of this headache |
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250 ldb #$02 |
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251 flshinit lda StatReg,x |
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252 * look at everything |
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253 ifeq DEBUG-1 |
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254 pshs a,b,x,u,y,cc,dp |
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255 jsr <D.BtBug lets see what its doing |
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256 puls a,b,x,u,y,cc,dp |
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257 endc |
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258 lda DataReg,x |
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259 ifeq DEBUG-1 |
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260 pshs a,b,x,u,y,cc,dp |
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261 jsr <D.BtBug lets see what its doing |
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262 puls a,b,x,u,y,cc,dp |
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263 endc |
| 2371 | 264 decb |
| 265 bne flshinit | |
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266 * looks like 2x is enough to clear things, its P3P3P3 till end. |
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267 * Fall thru to KilTim |
| 2371 | 268 |
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269 * this should allow the acia to overflow etc as the power/signin bytes come in |
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270 * but the Rx irq is disabled. |
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271 * We need at least 14 milliseconds plus 3 bytes at 1200 baud, |
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272 * which is 25 ms or about 40 milliseconds total. |
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273 KilTim pshs y stack -3 |
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274 ldb #$03 a small time delay |
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275 rloadlp ldy #$1FFF ditto, |
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276 dodelay leay -1,y |
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277 bne dodelay |
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278 decb |
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279 clra |
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280 puls y stack -1 |
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281 rts Return success regardless, stack -1 |
| 2371 | 282 |
| 283 | |
| 284 *** Only used by failed Init routine! | |
| 1846 | 285 * JoyDrv Termination. |
| 286 * | |
| 287 * INPUT: U = JoyDrv data area address (8 bytes) | |
| 288 * | |
| 289 * OUTPUT: IRQ service entry removed | |
| 290 * D, X, and U registers may be altered | |
| 291 * | |
| 292 * ERROR OUTPUT: CC = Carry set | |
| 293 * B = error code | |
| 0 | 294 Term pshs cc save regs we alter |
| 295 orcc #IntMasks mask IRQs while disabling ACIA | |
| 296 InitErr ldx M$Mem,pcr get base address | |
| 297 lda #TIC.RTS!Cmd.RxIE!Cmd.DTR *disable all | |
| 298 sta CmdReg,x *ACIA IRQs | |
| 299 leax StatReg,x point to status register | |
| 300 tfr x,d copy status register address | |
| 301 ldx #$0000 remove IRQ table entry | |
| 302 leay IRQSvc,pcr | |
| 2371 | 303 os9 F$IRQ |
| 304 | |
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305 * ifeq DEBUG-1 |
| 2371 | 306 pshs a,b,x,y,u,cc,dp |
| 307 lda #'j failed | |
| 308 jsr <D.BtBug | |
| 309 puls a,b,x,y,u,cc,dp | |
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310 * endc |
| 2371 | 311 |
| 312 TermExit puls cc clear stack | |
| 313 letssee bra letssee lock it with failed data on screen | |
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314 comb |
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315 ldb #E$PrcAbt |
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316 rts |
| 2371 | 317 ************************* |
| 318 * This code only good for tandy | |
| 319 * Joysticks. Why here? | |
| 1846 | 320 * Joystick button(s) status check. |
| 321 * | |
| 322 * INPUT: U = JoyDrv data area address (8 bytes) | |
| 323 * | |
| 324 * OUTPUT: B = button or "clear" status | |
| 325 * button(s) = xxxxLRLR | |
| 326 * A, X, and U registers may be altered | |
| 327 * | |
| 328 * ERROR OUTPUT: none | |
| 2371 | 329 SSJoyBtn ldb #$FF |
| 330 ldx #PIA0Base check for standard joystick/mouse fire buttons | |
| 0 | 331 stb $02,x |
| 2371 | 332 ldb ,x |
| 333 comb set == button pressed | |
| 334 andb #$0F | |
| 335 rts | |
| 336 * I (GH) don't believe the above code ever runs. | |
| 337 | |
| 338 **************************************** | |
| 1846 | 339 * Mouse button(s) status check. |
| 2371 | 340 * GH - 21/06/2008 will need center button additions |
| 341 * GH - 30/06/2008 redefined buttons | |
| 1846 | 342 * INPUT: U = JoyDrv data area address (8 bytes) |
| 343 * | |
| 344 * OUTPUT: B = button or "clear" status | |
| 2371 | 345 * ????? GH where did I find this set of bogus defines? |
| 346 * button(s) = xxxxLRLR looks like a 3$ bill | |
| 1846 | 347 * clear = 10000000 |
| 348 * shift-clear = 11000000 | |
| 349 * A, X, and U registers may be altered | |
| 350 * | |
| 351 * ERROR OUTPUT: none | |
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352 |
| 2371 | 353 SSMsBtn pshs cc |
| 354 orcc #IntMasks mask interrupts | |
| 355 lda Btn.Cntr,u | |
| 356 * GH now Q is do we wait till mouse packet is in? Not ATM | |
| 357 tfr a,b | |
| 1846 | 358 andb #%11000000 mask SHIFT-CLEAR |
| 2371 | 359 bne L0120 |
| 360 bita #BC.ButnL Left btn down? | |
| 361 beq L011A | |
| 362 orb #%00000011 wrong, will need adjustment | |
| 363 L011A bita #BC.ButnR Right btn down? | |
| 364 beq L0120 | |
| 365 orb #%00001100 wrong, will need adjustment | |
| 1846 | 366 L0120 anda #%00111111 turn off SHIFT-CLEAR flag |
| 2371 | 367 sta ,u |
| 368 puls pc,cc | |
| 369 | |
| 370 | |
| 1846 | 371 *** |
| 372 * Joystick/Mouse XY coordinate read. | |
| 2371 | 373 * |
| 1846 | 374 * INPUT: A = side flag (1 = right, 2 = left) |
| 375 * Y = resolution (0 = low, 1 = high) | |
| 376 * U = JoyDrv data area address (8 bytes) | |
| 2371 | 377 * |
| 1846 | 378 * OUTPUT: X = horizontal coordinate (left edge = 0) |
| 379 * low resolution = 0 to 63 | |
| 2371 | 380 * high resolution = 0 to HResMaxX |
| 1846 | 381 * Y = vertical coordinate (top edge = 0) |
| 382 * low resolution = 0 to 63 | |
| 383 * high resolution = 0 to HResMaxY | |
| 384 * D and U registers may be altered | |
| 2371 | 385 * |
| 1846 | 386 * ERROR OUTPUT: none |
| 2371 | 387 SSMsXY ldd #$017E |
| 388 pshs cc | |
| 389 orcc #IntMasks | |
| 0 | 390 ldx CrntXPos,u |
| 391 subd CrntYPos,u | |
| 2371 | 392 lsra |
| 393 rorb | |
| 394 tfr d,y | |
| 395 puls pc,cc | |
| 396 | |
| 397 ************************************* | |
| 0 | 398 * Mouse IRQ service routine. |
| 399 * | |
| 400 * INPUT: A = flipped and masked device status byte | |
| 2371 | 401 * NO IT'S NOT MASKED, normally $D8 coming into here |
| 402 * And the 4 lsb's are all we care about | |
| 0 | 403 * U = mouse data area address |
| 404 * | |
| 405 * OUTPUT: updated serial mouse data | |
| 406 * CC Carry clear | |
| 407 * D, X, Y, and U registers may be altered | |
| 408 * | |
| 409 * ERROR OUTPUT: none | |
| 2371 | 410 * GH 23/06/2008 We can watch the buffer with "dbmouse" |
| 411 * thanks Robert G. | |
| 412 IRQSvc ldx M$Mem,pcr is hdwe addr | |
| 413 anda Stat.Err any error(o/f/p)? | |
| 0 | 414 beq ChkRDRF no, go check Rx data |
| 2371 | 415 ldb DataReg,x read Rx data register to clear error flags |
| 416 IRQExit clrb clear Carry to mark IRQ serviced | |
| 417 rts all done | |
| 418 | |
| 419 ChkRDRF ldb DataReg,x get Rx data | |
| 420 lda Btn.Cntr,u get buttons, byte counter | |
| 421 bitb #MD.Sync Sync byte? | |
| 422 beq ChkOfst Not sync, go | |
| 423 | |
| 424 * is sync, zero Cntr first | |
| 425 * is only non-err place counter is reset! | |
| 426 * but leave buttons alone | |
| 427 anda #^BC.RxCnt leave buttons | |
| 428 inca to count byte | |
| 429 sta Btn.Cntr,u save btns, cntr=1 | |
| 430 | |
| 431 * GH 06/21/2008-from here to rts is sync byte only | |
| 432 * ENTER B=%??LRXXYY 1st byte from mouse | |
| 433 * Left button 1st | |
| 434 ChkLBtn bitb #MD.ButnL | |
| 435 beq BtnLu not set, go | |
| 436 ora #BC.ButnL down $20 | |
| 437 bra ChkRBtn | |
| 438 BtnLu anda #BU.ButnL release it | |
| 439 * Right button | |
| 440 ChkRBtn bitb #MD.ButnR $10 | |
| 441 beq BtnRu | |
| 442 ora #BC.ButnR $10 pushed | |
| 443 bra GoDoXY | |
| 444 BtnRu anda #BU.ButnR release it | |
| 445 * That does left/right buttons | |
| 446 * now do MS 2 bits of YYXX also in sync byte | |
| 447 GoDoXY sta Btn.Cntr,u save count, buttons | |
| 448 lslb needs 4 shifts | |
| 449 lslb to put YY | |
| 450 lslb in d7, d6 | |
| 451 lslb | |
| 452 pshs b Save YYXX0000 | |
| 453 andb #MskYYXX nuke XX leave YY000000 | |
| 454 stb Buffer+2,u preload YY | |
| 455 puls b refresh b | |
| 456 lslb | |
| 457 lslb Now only XX000000 | |
| 458 stb Buffer+1,u mark in sync, 1st byte done | |
| 459 clrb clear errors | |
| 460 rts sync byte done | |
| 461 * the above does first byte with 0SBBYYXX | |
| 462 * Putting YY in MS2bits of Buffer+1,u (2,u) | |
| 463 * And XX in MS2bits of Buffer+0,u (1,u) | |
| 464 * And we have now set Btn.Cntr to 1+ buttons | |
| 465 *====================================== | |
| 466 * we arrive here in sync, with BT.Cntr,u | |
| 467 * in a, ( s/b 1 or 2) but buttons not masked out | |
| 468 *====================================== | |
| 469 ChkOfst inc Btn.Cntr,u count byte | |
| 470 lda Btn.Cntr,u | |
| 471 anda #BC.RxCnt mask out btns | |
| 472 cmpa #PcktSize last byte std pkt? | |
| 473 bcs SaveData no, go save YYXX mouse data to Rx buffer... | |
| 474 | |
| 475 * this is a good place to handle the center button in the 4th byte | |
| 476 DoCBtn lda Btn.Cntr,u get old button status | |
| 477 bitb #MD.ButnC is 4th byte, status of middle button? | |
| 478 beq BtnCUp | |
| 479 ora #BC.ButnC set middle button | |
| 480 bra BtnCfn | |
| 481 BtnCUp anda #BU.ButnC unset it | |
| 482 BtnCfn sta Btn.Cntr,u put back new status | |
| 483 * GH - 01/07/2008 switch out the M$ center button | |
| 484 * code till next reboot | |
| 485 SetLgtk lda #'L | |
| 486 sta Buffer,u set Lgtk mode | |
| 487 clrb | |
| 488 rts | |
| 489 | |
| 490 * we arrive here with byte #(2 or 3) in a, rx byte in b | |
| 491 * offset a,u is sync bytes %YY000000 or %XX000000 | |
| 492 SaveData orb a,u incl 2 ms bits | |
| 493 stb a,u save Y or X position byte to mouse data Rx buffer | |
| 494 * Is last of YYXX data if a=3 here | |
| 495 cmpa #PcktSize-1 | |
| 496 bne NotLstXY not last byte | |
| 497 * GH - 01/07/2008 do till Logitek sends 4th byte | |
| 498 * check to see if a Logitek mouse has been discovered | |
| 499 CkMSMou lda Buffer,u | |
| 500 cmpa #'M | |
| 501 bne DoCalcs skip this | |
| 502 * GH - 01/07/2008 else do M$ style center button | |
| 503 lda Btn.Cntr,u | |
| 504 anda #BC.Butns any btns down? | |
| 505 adda Buffer+1,u add motion | |
| 506 adda Buffer+2,u add motion | |
| 507 bne MBtnCup | |
| 508 lda Btn.Cntr,u | |
| 509 ora #BC.ButnC | |
| 510 sta Btn.Cntr,u | |
| 511 bra NotLstXY no use doing calcs | |
| 512 MBtnCup lda Btn.Cntr,u | |
| 513 anda #BU.ButnC | |
| 514 sta Btn.Cntr,u | |
| 515 DoCalcs ldx #HResMaxY*2 get maximum Y position | |
| 0 | 516 pshs x save it for CalcPos subroutine |
| 517 leax CrntYPos,u point to current Y position | |
| 2371 | 518 * arrive here with regs b=YY |
| 519 * Y motion is bass ackwards so | |
| 520 comb complement | |
| 521 incb 2's complement | |
| 0 | 522 bsr CalcPos go calculate & save mouse's new Y position |
| 2371 | 523 * now get full XX data |
| 524 ldb Buffer+1,u get X offset | |
| 0 | 525 ldx #HResMaxX get maximum X position |
| 526 stx ,s save it for CalcPos subroutine | |
| 527 leax CrntXPos,u point to current X position | |
| 528 bsr CalcPos go calculate & save mouse's new X position | |
| 529 leas 2,s clean up stack | |
| 2371 | 530 NotLstXY clrb clear Carry to mark IRQ serviced |
| 531 rts | |
| 532 | |
| 533 * destroys A, also slow, needs 12" square mouse pad! | |
| 0 | 534 CalcPos sex sign extend mouse packet's 2nd XY offset ([D] = -128 to +127) |
| 535 pshs d save it temporarily... | |
| 536 std ,s save XY offset total temporarily... | |
| 537 bpl PosAdjst go de-sensitize positive "ballistic" XY offset... | |
| 538 orb #%00000111 if -8<XYoffset<0, no "ballistic" response | |
| 539 addd #1 "fix" negative offset "ballistic" response | |
| 540 bra RShiftD go calculate "ballistic" offset... | |
| 541 PosAdjst andb #%11111000 if 0<XYoffset<8, no "ballistic" response | |
| 542 RShiftD asra *calculate 50% of XY offset | |
| 543 rorb *for "ballistic" response | |
| 544 addd ,s++ add original XY offset total, clean up stack | |
| 545 addd ,x add mouse's current XY position | |
| 546 bpl CheckPos zero or positive XY position, go check it... | |
| 547 clra *set minimum | |
| 548 clrb *XY position | |
| 549 CheckPos cmpd 2,s past maximum XY position? | |
| 550 bls SavePos no, go save it... | |
| 551 ldd 2,s get maximum XY position | |
| 552 SavePos std ,x save new XY position | |
| 2371 | 553 rts |
| 554 | |
| 555 emod | |
| 556 eom equ * | |
| 557 end | |
| 558 |