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migrated to ACME assembler

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commit 145d64aa6e78838ed07cefed372f0ad6a4687e97
Author: FeralChild64 <you@example.com>
Date:   Sun Sep 20 20:16:57 2020 +0200

    ACME adaptation

commit 885209d7822286744ea53232ae7461472a01d5d6
Author: FeralChild64 <you@example.com>
Date:   Sun Sep 20 19:57:25 2020 +0200

    ACME adaptation

commit 334d84486bc603551887e7cbeb59d329f2224cc7
Author: FeralChild64 <you@example.com>
Date:   Sun Sep 20 18:29:15 2020 +0200

    ACME adaptation

commit b5966f49bcd8f0ca79cbec93819a31238924707e
Author: FeralChild64 <you@example.com>
Date:   Sun Sep 20 18:09:31 2020 +0200

    ACME adaptation

commit 786536a93a5eab5e676fca99625b4eb094a554e7
Author: FeralChild64 <you@example.com>
Date:   Sun Sep 20 17:24:48 2020 +0200

    ACME adaptation

commit 704c70dfb1f5d68775d6f3da220803b8a3990f56
Author: FeralChild64 <you@example.com>
Date:   Sun Sep 20 15:07:12 2020 +0200

    ACME adaptation

commit 136874964c9083b375f151475310f9636871fc72
Author: FeralChild64 <you@example.com>
Date:   Sun Sep 20 14:45:14 2020 +0200

    ACME adaptation

commit 8eca0d5700b72d04336e72c5cd3a68e18b85f96d
Author: FeralChild64 <you@example.com>
Date:   Sun Sep 20 14:06:52 2020 +0200

    ACME adaptation

commit 11d29eb7ee318239d782f85498b6d0524624d5c4
Author: FeralChild64 <you@example.com>
Date:   Sun Sep 20 13:56:45 2020 +0200

    ACME apaptation

commit c9b5e5e04cceb92c66bc027e6440bc0f7c5a499f
Author: FeralChild64 <you@example.com>
Date:   Sun Sep 20 13:49:04 2020 +0200

    ACME adaptation

commit f5cc254cbc921f07863807468cb3fe26b410b409
Author: FeralChild64 <you@example.com>
Date:   Sun Sep 20 13:01:18 2020 +0200

    ACME adaptation

commit e135a27bf9c30cc0965379c954564e06406303b1
Author: FeralChild64 <you@example.com>
Date:   Sat Sep 19 21:55:01 2020 +0200

    ACME adaptation

commit e9dfddf90d9e2795e88b7da40ae050d733faeb56
Author: FeralChild64 <you@example.com>
Date:   Sat Sep 19 21:48:47 2020 +0200

    Makefile fix

commit 07030104c65cf5e5beeacf6d629ccb9245e58657
Author: FeralChild64 <you@example.com>
Date:   Sat Sep 19 21:42:00 2020 +0200

    ACME adaptation

commit f824362ee5bcfbffca86c430b57773b2ffd65655
Author: FeralChild64 <you@example.com>
Date:   Sat Sep 19 20:14:56 2020 +0200

    ACME adaptation

commit 3a3c59007dcd4940d89b8669f34ca56b61c25fdf
Author: FeralChild64 <you@example.com>
Date:   Fri Sep 18 21:51:45 2020 +0200

    ACME adaptation

commit 6790ef7bc88a41de2881c69b7524dd4ab8c74b5d
Author: FeralChild64 <you@example.com>
Date:   Fri Sep 18 20:35:23 2020 +0200

    ACME adaptation

commit 38ad18b90e9ec713aa7ca49576b3388ce1733357
Author: FeralChild64 <you@example.com>
Date:   Fri Sep 18 18:46:20 2020 +0200

    ACME adaptation

commit 541340371122a9702f7b2d9771c298223cffd0e9
Author: FeralChild64 <you@example.com>
Date:   Fri Sep 18 16:49:46 2020 +0200

    ACME adaptation

commit 25cfd5e186459be1a260d3eb8cfff767838de370
Author: FeralChild64 <you@example.com>
Date:   Thu Sep 17 20:13:33 2020 +0200

    ACME adaptation

commit f61599444d5b1d03d8fd8e4a6a7c3b85069bedb3
Author: FeralChild64 <you@example.com>
Date:   Thu Sep 17 19:29:23 2020 +0200

    ACME adaptation

commit b290be31ec7bb2e5723607697da1bbc621c84429
Author: FeralChild64 <you@example.com>
Date:   Thu Sep 17 17:20:14 2020 +0200

    ACME adaptation

commit 877be9e856880d98fd4bcb25b42aaaacda9dc463
Author: FeralChild64 <you@example.com>
Date:   Wed Sep 16 21:47:38 2020 +0200

    ACME adaptation

commit bb20edaf85d386e41d5c2f715b745b68fbd3362e
Author: FeralChild64 <you@example.com>
Date:   Wed Sep 16 21:31:30 2020 +0200

    ACME adaptation

commit c5d31bd8685abce37c8e254d15aac20bd1570d9f
Author: FeralChild64 <you@example.com>
Date:   Wed Sep 16 18:40:49 2020 +0200

    ACME adaptation

commit 29349826b38f8a89649171559dc8cf24c560aff1
Author: FeralChild64 <you@example.com>
Date:   Mon Sep 14 23:35:47 2020 +0200

    ACME adaptation

commit 8bcd6a621c4b11766d0cf34f79858ba90a67248e
Author: FeralChild64 <you@example.com>
Date:   Mon Sep 14 22:52:25 2020 +0200

    ACME adaptation

commit e87a69edc2ce4bfcc460c31e08dcc352a985f88d
Author: FeralChild64 <you@example.com>
Date:   Mon Sep 14 22:43:27 2020 +0200

    ACME adaptation

commit f49a097bd52e96d00b866c02bda7121e4543233c
Author: FeralChild64 <you@example.com>
Date:   Mon Sep 14 19:02:07 2020 +0200

    ACME adaptation

commit fa0e9214a633b8e8f867cc70925b390940dcd426
Author: FeralChild64 <you@example.com>
Date:   Mon Sep 14 17:47:19 2020 +0200

    ACME adaptation

commit 1b763b91e7a03e426227129c7f22f0ce57a4c197
Author: FeralChild64 <you@example.com>
Date:   Mon Sep 14 17:17:10 2020 +0200

    ACME adaptation

commit e92a4b57b232cd85eb1e71090b8a89c7c8461ebc
Author: FeralChild64 <you@example.com>
Date:   Mon Sep 14 17:15:37 2020 +0200

    ACME adaptation

commit de3c693e8a7e73ea5289198946058e3240894e6a
Author: FeralChild64 <you@example.com>
Date:   Mon Sep 14 17:10:05 2020 +0200

    ACME adaptation

commit f9bd7ae0f04e932d613be9ed5cb19af9be5d338e
Author: FeralChild64 <you@example.com>
Date:   Sun Sep 13 14:34:44 2020 +0200

    ACME adaptation

commit 694dee52555dbfc2b1f7f452a9671ff51106c057
Author: FeralChild64 <you@example.com>
Date:   Sun Sep 13 14:16:14 2020 +0200

    ACME adaptation

commit 0af2c55edfcd22942d9f25417eb0d35f55b71604
Author: FeralChild64 <you@example.com>
Date:   Fri Sep 11 17:38:09 2020 +0200

    ACME adaptation

commit 2015e17334bd56a1e8a13a5abc098d9c2e7ea44f
Author: FeralChild64 <you@example.com>
Date:   Fri Sep 11 16:46:05 2020 +0200

    ACME adaptation

commit b1e972162798d60f4483cd6cc261e856c20c2c8c
Author: FeralChild64 <you@example.com>
Date:   Fri Sep 11 16:24:31 2020 +0200

    ACME adaptation

commit 9d027e868466901ba53bf074a79ec8cf16273021
Author: FeralChild64 <you@example.com>
Date:   Fri Sep 11 15:04:31 2020 +0200

    ACME adaptation

commit 957186deddd1aa4f3b4f1aa1f421e4239a584e57
Author: FeralChild64 <you@example.com>
Date:   Thu Sep 10 22:49:07 2020 +0200

    ACME adaptation

commit b8060f67a455cfac109f08d96b62c360d693b931
Author: FeralChild64 <you@example.com>
Date:   Wed Sep 9 23:07:28 2020 +0200

    ACME adaptation

commit e54d004568f44bbfe5c070ef1d7cf3544112e497
Author: FeralChild64 <you@example.com>
Date:   Wed Sep 9 22:58:20 2020 +0200

    ACME adaptation

commit f90b77f073c5a605cb31c6ee451f65c8a8aff7d8
Author: FeralChild64 <you@example.com>
Date:   Wed Sep 9 22:12:09 2020 +0200

    ACME adaptation

commit b211bb4afcd9c58fe1f5c92f3007717d611cd531
Author: FeralChild64 <you@example.com>
Date:   Wed Sep 9 22:01:40 2020 +0200

    ACME adaptation

commit 8d7ea343b07e9e08e5f77f3c414758a6cffd0440
Author: FeralChild64 <you@example.com>
Date:   Wed Sep 9 21:38:34 2020 +0200

    ACME adaptation

commit 46413eb0d92d6400aba0ff8dfe556e61e8a44d78
Author: FeralChild64 <you@example.com>
Date:   Wed Sep 9 21:07:47 2020 +0200

    ACME adaptation

commit 9f98f69ecc21f7b74a5eb89e247f5a2c6fcb655d
Author: FeralChild64 <you@example.com>
Date:   Wed Sep 9 20:05:03 2020 +0200

    ACME adaptation

commit 7bb9f1cadc682c7e0a4a6796739d860d473ca110
Author: FeralChild64 <you@example.com>
Date:   Wed Sep 9 19:55:12 2020 +0200

    ACME adaptation

commit 5fc115392b5bdca6b56f67ad866b1884d2d2bdf8
Author: FeralChild64 <you@example.com>
Date:   Wed Sep 9 19:31:10 2020 +0200

    ACME adaptation

commit b7940fc60e568d859df9e3156f6bacc6d685b2cc
Author: FeralChild64 <you@example.com>
Date:   Wed Sep 9 19:16:09 2020 +0200

    ACME adaptation

commit 56288cb97197561afa0816b29c134ec1190e8eab
Author: FeralChild64 <you@example.com>
Date:   Wed Sep 9 18:48:23 2020 +0200

    ACME adaptation

commit 10401a60fc7922a53d782120ef6795d889140218
Author: FeralChild64 <you@example.com>
Date:   Wed Sep 9 16:34:16 2020 +0200

    ACME adaptation

commit 8ce76e4d2b56837a691ae84b1a412a2ae32a157b
Author: FeralChild64 <you@example.com>
Date:   Wed Sep 9 16:20:44 2020 +0200

    ACME adaptation

commit 33fade899fa6172ea6b5b5f6683bb61f544429fd
Author: FeralChild64 <you@example.com>
Date:   Wed Sep 9 15:28:46 2020 +0200

    ACME adaptation

commit a416f04734402fcfbc57a933731376df2e0180a1
Author: FeralChild64 <you@example.com>
Date:   Wed Sep 9 12:40:03 2020 +0200

    ACME adaptation

commit f8daee005b1d29f6912723be2ac94bc5fbeb0508
Author: FeralChild64 <you@example.com>
Date:   Mon Sep 7 23:29:54 2020 +0200

    ACME adaptation

commit 83fe6bdd0b08a44fdbfc6eefe323a4b194ccaf5b
Author: FeralChild64 <you@example.com>
Date:   Mon Sep 7 22:23:16 2020 +0200

    ACME adaptation

commit cb1f75620b9c83000a15c9c7f7acefdfee79a979
Author: FeralChild64 <you@example.com>
Date:   Mon Sep 7 19:23:12 2020 +0200

    ACME adaptation

commit e524d517c933ae1f0aeb49764d307fadb4845025
Author: FeralChild64 <you@example.com>
Date:   Sun Sep 6 08:24:25 2020 +0200

    ACME adaptation - replaced comments

commit 2ab572c3a21f4a78a7312d0e684bc11d91d1717a
Author: FeralChild64 <you@example.com>
Date:   Sat Sep 5 17:59:10 2020 +0200

    ACME adaptation - replaced the assembler
This commit is contained in:
FeralChild64 committed 2020-09-20 20:22:36 +02:00
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commit c8d255130c
685 files changed
+15835 -16296
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src/kernal/iec/iec_rx_byte.s
+78 -79
View File
@@ -1,161 +1,160 @@
// #LAYOUT# STD * #TAKE
// #LAYOUT# * KERNAL_0 #TAKE
// #LAYOUT# * * #IGNORE
;; #LAYOUT# STD * #TAKE
;; #LAYOUT# * KERNAL_0 #TAKE
;; #LAYOUT# * * #IGNORE
// Receive a byte from the IEC bus.
// Implemented based on https://www.pagetable.com/?p=1135, https://github.com/mist64/cbmbus_doc,
// http://www.zimmers.net/anonftp/pub/cbm/programming/serial-bus.pdf (page 11)
//
// Preserves .X and .Y registers
; Receive a byte from the IEC bus.
; Implemented based on https://www.pagetable.com/?p=1135, https://github.com/mist64/cbmbus_doc,
; http://www.zimmers.net/anonftp/pub/cbm/programming/serial-bus.pdf (page 11)
;
; Preserves .X and .Y registers
#if CONFIG_IEC
!ifdef CONFIG_IEC {
#if CONFIG_IEC_JIFFYDOS
!ifdef CONFIG_IEC_JIFFYDOS {
iec_rx_dispatch:
lda IECPROTO
cmp #IEC_JIFFY
beq_16 jiffydos_rx_byte
+beq jiffydos_rx_byte
// FALLTROUGH
; FALLTROUGH
#endif // CONFIG_IEC_JIFFYDOS
} ; CONFIG_IEC_JIFFYDOS
iec_rx_byte:
// Store .X and .Y on the stack - preserve them
phx_trash_a
phy_trash_a
; Store .X and .Y on the stack - preserve them
+phx_trash_a
+phy_trash_a
// Timing is critical here - execute on disabled IRQs
// The best practice would be to do PHP first, but it seems this is not
// what the original ROM does; furthermore, pushing additional bytes to
// stack can wreck autostart softwaree loading at $0100
; Timing is critical here - execute on disabled IRQs
; The best practice would be to do PHP first, but it seems this is not
; what the original ROM does; furthermore, pushing additional bytes to
; stack can wreck autostart softwaree loading at $0100
sei
// First, we wait for the talker to release the CLK line
; First, we wait for the talker to release the CLK line
jsr iec_wait_for_clk_release
// We then release the DATA to signal we are ready
// We can use this routine, since we were not pulling CLK anyway
; We then release the DATA to signal we are ready
; We can use this routine, since we were not pulling CLK anyway
jsr iec_release_clk_data
// Wait till data line is released (someone else might be holding it)
; Wait till data line is released (someone else might be holding it)
jsr iec_wait_for_data_release
// Check if EOI
; Check if EOI
jsr iec_rx_check_eoi
#if CONFIG_IEC_DOLPHINDOS
!ifdef CONFIG_IEC_DOLPHINDOS {
// Check if DolphinDOS was detected
; Check if DolphinDOS was detected
lda IECPROTO
cmp #IEC_DOLPHIN
bne iec_rx_no_dolphindos
// For DolphinDOS just fetch the byte from parallel port
; For DolphinDOS just fetch the byte from parallel port
lda CIA2_PRB
pha
jmp iec_rx_acknowledge
iec_rx_no_dolphindos:
#endif // CONFIG_IEC_DOLPHINDOS
} ; CONFIG_IEC_DOLPHINDOS
// Latch input bits in on rising edge of CLK, eight times for eight bits.
; Latch input bits in on rising edge of CLK, eight times for eight bits.
ldx #7
// Get empty byte to load into.
; Get empty byte to load into.
lda #$00
pha
iec_rx_bit_loop:
// Wait for CLK to release
; Wait for CLK to release
jsr iec_wait_for_clk_release
// (we do this implicitly below, with a tighter routine,
// so that we do not have timing problems, as the requirements
// are quite tight. Basically we need to read the clock and data
// bit from the same byte read.
; (we do this implicitly below, with a tighter routine,
; so that we do not have timing problems, as the requirements
; are quite tight. Basically we need to read the clock and data
; bit from the same byte read.
// DATA now has the next bit, but inverted (well, except that it turns out not to be).
// DATA is in bit 7, which is a bit annoying.
// But we can clock it out with a ROL instruction
// so that it is in C. We can then ROR it into the
// partial data byte.
// We use ROR so that we shift in from the top, so that
// the first bit we shift in ends up in bit 0 after all
// 8 bits have been read.
// ODD: For some reason we don't need to invert the
// received bits. This is weird, because we invert them
// on the way out, and everything in the protocol seems
// to indicate that we sould do so. But experimentation
// has confirmed the bits don't need inversion on reception.
; DATA now has the next bit, but inverted (well, except that it turns out not to be).
; DATA is in bit 7, which is a bit annoying.
; But we can clock it out with a ROL instruction
; so that it is in C. We can then ROR it into the
; partial data byte.
; We use ROR so that we shift in from the top, so that
; the first bit we shift in ends up in bit 0 after all
; 8 bits have been read.
; ODD: For some reason we don't need to invert the
; received bits. This is weird, because we invert them
; on the way out, and everything in the protocol seems
; to indicate that we sould do so. But experimentation
; has confirmed the bits don't need inversion on reception.
// Move data bit into C flag, and loop until bit 6 clears
// i.e., the clock has been released.
; Move data bit into C flag, and loop until bit 6 clears
; i.e., the clock has been released.
!: lda CIA2_PRA
@1:
lda CIA2_PRA
rol
bpl !-
bpl @1
// Pull it into the data byte
; Pull it into the data byte
pla
ror
pha
// Wait for CLK to be pulled again, over 300 usec (307 cycles on NTSC)
// consider this a timeout
ldy #$19 // 2 cycles
; Wait for CLK to be pulled again, over 300 usec (307 cycles on NTSC)
; consider this a timeout
ldy #$19 ; 2 cycles
iec_rx_clk_wait2:
lda CIA2_PRA // 4 cycles
rol // 2 cycles, to put CLK in as the last bit
bpl !+ // 2 cycles if not jumped
dey // 2 cycles
bne iec_rx_clk_wait2 // 3 cycles if jumped
lda CIA2_PRA ; 4 cycles
rol ; 2 cycles, to put CLK in as the last bit
bpl @2 ; 2 cycles if not jumped
dey ; 2 cycles
bne iec_rx_clk_wait2 ; 3 cycles if jumped
// Timeout
; Timeout
jsr kernalstatus_EOI
pla
jmp iec_rx_end
!:
// More bits?
@2:
; More bits?
dex
bpl iec_rx_bit_loop
// FALLTROUGH
; FALLTROUGH
iec_rx_acknowledge:
// Then we must within 1000 usec acknowledge the byte by
// pulling DATA. At this point, CLK is pulled by the
// talker and DATA by us, i.e., we are ready to receive
// the next byte. (p11).
; Then we must within 1000 usec acknowledge the byte by
; pulling DATA. At this point, CLK is pulled by the
; talker and DATA by us, i.e., we are ready to receive
; the next byte. (p11).
jsr iec_release_clk_pull_data
// Retrieve the received byte
; Retrieve the received byte
pla
// Restore registers
sta TBTCNT // $A4 is a byte buffer according to http://sta.c64.org/cbm64mem.html
; Restore registers
sta TBTCNT ; $A4 is a byte buffer according to http://sta.c64.org/cbm64mem.html
// FALLTROUGH
; FALLTROUGH
iec_rx_end:
ply_trash_a
plx_trash_a
+ply_trash_a
+plx_trash_a
lda TBTCNT
clc
cli
rts
#endif // CONFIG_IEC
}