more JiffyDOS code - low nibble TX, general turbo dispatcher
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FeralChild64 committed
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28bc07ea23
commit
d0fd34e79f
10 files changed
+422
-293
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@@ -14,7 +14,11 @@ ACPTR:
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jsr kernalstatus_reset
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#if CONFIG_IEC
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#if CONFIG_IEC_JIFFYDOS
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jmp iec_rx_dispatch
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#else // no turbo supported
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jmp iec_rx_byte
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#endif
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#else
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jmp kernalerror_ILLEGAL_DEVICE_NUMBER
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#endif
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@@ -33,7 +33,11 @@ ciout_store_in_buffer:
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ciout_send_byte:
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clc // don't send with EOI
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#if CONFIG_IEC_JIFFYDOS
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jsr iec_tx_dispatch
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#else // no turbo supported
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jsr iec_tx_byte
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#endif
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inc C3PO // iec_tx_byte sets it to 0, but we still have something to send
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jmp ciout_store_in_buffer
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+173
-184
@@ -1,184 +1,173 @@
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//
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// JiffyDOS protocol support for IEC
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//
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// XXX finish this
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#if CONFIG_IEC_JIFFYDOS
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// JiffyDOS timing regime is very strict - before transmitting anything
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// we need to disable sprites and (if screen is not disabled) wait for
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// appropriate moment, so that no badline interruption can happen
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iec_tx_byte_jiffydos:
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// We need to preserve 3 lowest bits of CIA2_PRA - as they encode
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// Use C3PO for this, as afterwards we have to set there 0 nevertheless
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lda CIA2_PRA
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and #%00000111
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sta C3PO
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// Hide sprites, store their previous status on stack
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jsr jiffydos_hide_sprites
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pha
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// Prepare nibbles to send
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lda TBTCNT
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and #$0F
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pha
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lda TBTCNT
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and #$F0
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pha
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// Wait till receiver is ready
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jsr iec_wait_for_data_release
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__jd_check1:
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// Wait till it is safe to send data
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jsr jiffydos_wait_line
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// Notify device that we are going to send byte by releasing everything
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// Cycles: 3 + 4 = 7
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lda C3PO
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sta CIA2_PRA
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// Send high nibble; cycles: 4 + 3 + 4 + 2 + 2 + 2 + 4 = 21
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pla // retrieve high nibble from stack
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ora C3PO // restore VIC-II and RS-232 bits
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sta CIA2_PRA // bits 4 and 5 on CLK/DATA
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ror // move bits 6 and 7 to positions 4 and 5
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ror
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and #%00110000 // clear everything but CLK/DATA
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sta CIA2_PRA // bits 6 and 7 on CLK/DATA
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// Send low nibble; cycles: XXX
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// XXX something strange seems to happen with low nibble:
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// $0 -> $00
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// $1 -> $80 = $10 + $70
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// $2 -> $20
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// $3 -> $A0 = $30 + $70
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// $4 -> $40
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// $5 -> $C0 = $50 + $70
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// $6 -> $60
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// $7 -> $E0 = $70 + $70
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// $8 -> $10 = $80 - $70
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// $9 -> $90
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// $A -> $30 = $A0 - $70
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// $B -> $B0
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// $C -> $50 = $C0 - $70
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// $D -> $D0
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// $E -> $70 = $E0 - $70
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// $F -> $F0
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// XXX why??? how this is calculated???
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// XXX EOI signalled by early CLK (20us delay for non-CLK?)
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// Re-enable sprites
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pla
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lda VIC_SPENA
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// Mark TX buffer as empty
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lda #$00
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sta C3PO
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rts
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iec_rx_byte_jiffydos:
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// Hide sprites, store their previous status on stack
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jsr jiffydos_hide_sprites
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pha
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// Wait until device is ready to send
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jsr iec_wait_for_clk_release
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// Prepare 'start sending' message
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lda CIA2_PRA
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and #$FF - BIT_CIA2_PRA_DAT_OUT // release
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pha
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// Wait for appropriate moment
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jsr jiffydos_wait_line
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// Ask device to start sending bits
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pla
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sta CIA2_PRA
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// XXX retrieve byte
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// Re-enable sprites
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pla
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lda VIC_SPENA
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rts
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jiffydos_wait_line:
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lda VIC_SCROLY
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and #$10
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beq jiffydos_wait_line_done // screen is disabled, no need to watch for badlines
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// To give the transfer routine as much time as possible,
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// wait till a badline
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// XXX this is probably overkill, most likely it is enough to avoid 2 (3?) lines
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// before badline - to be adjusted in the future
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!:
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sec
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lda VIC_SCROLY
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sbc VIC_RASTER
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and #$07 // we want 8 lowest bits
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bne !-
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jiffydos_wait_line_done:
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rts
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__jd_check2:
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jiffydos_hide_sprites:
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lda VIC_SPENA
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ldx #$00
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stx VIC_SPENA
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rts
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.function SAME_PAGE_CHECK(label_1, label_2)
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{
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#if PASS_SIZETEST
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.return (label_1 - label_1 % 256) == (label_2 - label_2 % 256)
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#else
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.return true
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#endif
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}
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.if (!SAME_PAGE_CHECK(__jd_check1, __jd_check2))
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{
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// To meet the strict JiffyDOS timing, we need to make sure
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// it does not span across multiple pages, as this would add
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// 1 cycle to some jump instructions - maybe this wont cause
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// problems, but better safe than sorry.
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.error "JiffyDOS code can't span across multiple pages"
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}
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#endif // CONFIG_IEC_JIFFYDOS
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//
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// JiffyDOS protocol support for IEC
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//
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// XXX finish this
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#if CONFIG_IEC_JIFFYDOS
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// JiffyDOS timing regime is very strict - before transmitting anything
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// we need to disable sprites and (if screen is not disabled) wait for
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// appropriate moment, so that no badline interruption can happen
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iec_tx_byte_jiffydos:
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// We need to preserve 3 lowest bits of CIA2_PRA - as they encode
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// Use C3PO for this, as afterwards we have to set there 0 nevertheless
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lda CIA2_PRA
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and #%00000111
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sta C3PO
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// Hide sprites, store their previous status on stack
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jsr jiffydos_hide_sprites
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pha
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// Prepare nibbles to send
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lda TBTCNT
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and #$0F
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tax
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lda iec_jiffydos_bittable, X // low nibble has to be encoded
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pha
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lda TBTCNT
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and #$F0
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pha
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// Wait till receiver is ready
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jsr iec_wait_for_data_release
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__jd_check1:
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// Wait till it is safe to send data
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jsr jiffydos_wait_line
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// Notify device that we are going to send byte by releasing everything
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// Cycles: 3 + 4 = 7
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lda C3PO
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sta CIA2_PRA
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// Send high nibble; cycles: 4 + 3 + 4 + 2 + 2 + 2 + 4 = 21
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pla // retrieve high nibble from stack
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ora C3PO // restore VIC-II and RS-232 bits
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sta CIA2_PRA // bits 4 and 5 on CLK/DATA
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ror // move bits 6 and 7 to positions 4 and 5
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ror
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and #%00110000 // clear everything but CLK/DATA
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sta CIA2_PRA // bits 6 and 7 on CLK/DATA
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// Send low nibble; cycles: 4 + 3 + 4 + 2 + 2 + 2 + 4 = 21
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pla // retrieve low nibble from stack
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ora C3PO // restore VIC-II and RS-232 bits
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sta CIA2_PRA
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ror
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ror
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and #%00110000 // clear everything but CLK/DATA
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sta CIA2_PRA
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// XXX EOI signalled by early CLK (20us delay for non-CLK?)
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// Re-enable sprites
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pla
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lda VIC_SPENA
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// Mark TX buffer as empty
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lda #$00
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sta C3PO
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rts
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iec_rx_byte_jiffydos:
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// Hide sprites, store their previous status on stack
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jsr jiffydos_hide_sprites
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pha
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// Wait until device is ready to send
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jsr iec_wait_for_clk_release
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// Prepare 'start sending' message
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lda CIA2_PRA
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and #$FF - BIT_CIA2_PRA_DAT_OUT // release
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pha
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// Wait for appropriate moment
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jsr jiffydos_wait_line
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// Ask device to start sending bits
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pla
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sta CIA2_PRA
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// XXX retrieve byte
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// Re-enable sprites
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pla
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lda VIC_SPENA
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rts
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jiffydos_wait_line:
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lda VIC_SCROLY
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and #$10
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beq jiffydos_wait_line_done // screen is disabled, no need to watch for badlines
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// To give the transfer routine as much time as possible,
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// wait till a badline
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// XXX this is probably overkill, most likely it is enough to avoid 2 (3?) lines
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// before badline - to be adjusted in the future
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!:
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sec
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lda VIC_SCROLY
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sbc VIC_RASTER
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and #$07 // we want 8 lowest bits
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bne !-
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jiffydos_wait_line_done:
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rts
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__jd_check2:
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jiffydos_hide_sprites:
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lda VIC_SPENA
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ldx #$00
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stx VIC_SPENA
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rts
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.function SAME_PAGE_CHECK(label_1, label_2)
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{
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#if PASS_SIZETEST
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.return (label_1 - label_1 % 256) == (label_2 - label_2 % 256)
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#else
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.return true
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#endif
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}
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.if (!SAME_PAGE_CHECK(__jd_check1, __jd_check2))
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{
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// To meet the strict JiffyDOS timing, we need to make sure
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// it does not span across multiple pages, as this would add
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// 1 cycle to some jump instructions - maybe this wont cause
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// problems, but better safe than sorry.
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.error "JiffyDOS code can't span across multiple pages"
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}
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#endif // CONFIG_IEC_JIFFYDOS
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@@ -0,0 +1,33 @@
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//
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// Helper table for encoding lower nibble for JiffyyDOS,
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// values found by observing the actual transfer
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//
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#if CONFIG_IEC_JIFFYDOS
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// XXX consider calculating the values on-the-fly
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iec_jiffydos_bittable:
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.byte $00
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.byte $80 // $10 + $70
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.byte $20
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.byte $A0 // $30 + $70
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.byte $40
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.byte $C0 // $50 + $70
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.byte $60
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.byte $E0 // $70 + $70
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.byte $10 // $80 - $70
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.byte $90
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.byte $30 // $A0 - $70
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.byte $B0
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.byte $50 // $C0 - $70
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.byte $D0
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.byte $70 // $E0 - $70
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.byte $F0
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#endif // CONFIG_IEC_JIFFYDOS
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@@ -0,0 +1,32 @@
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//
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// Arbitration code for normal/turbo transfer
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//
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#if CONFIG_IEC_JIFFYDOS
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iec_rx_dispatch:
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lda IECPROTO
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#if CONFIG_IEC_JIFFYDOS
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cmp #$01
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beq iec_rx_dispatch_jiffydos
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#endif // CONFIG_IEC_JIFFYDOS
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// FALLTROUGH
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iec_rx_dispatch_normal:
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plp
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jmp iec_rx_byte
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#if CONFIG_IEC_JIFFYDOS
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iec_rx_dispatch_jiffydos:
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plp
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jmp iec_rx_byte_jiffydos
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#endif // CONFIG_IEC_JIFFYDOS
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#endif // any turbo supported
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@@ -68,21 +68,21 @@ iec_tx_common_sendbit:
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cpx #$00
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bne !+ // branch if not sending the last bit
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ldy #$1B // 400us is nearly 410 cycles on NTSC
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// loop iteration below is 15 cycles,
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ldy #$25 // 400us is nearly 410 cycles on NTSC
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// loop iteration below is 11 cycles,
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// and several cycles were already used
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iec_jiffydos_detect_loop:
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lda CIA2_PRA // 4 cycles
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bpl iec_jiffydos_detected // 2 cycles
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dey // 2 cycles
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bne iec_jiffydos_detect_loop // 2 cycles
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bne iec_jiffydos_detect_loop // 3 cycles if branch
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lda #$00 // 2 cycles
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beq iec_jiffydos_store_proto // 3 cycles, branch always
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lda #$00 // normal protocol
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skip_2_bytes_trash_nvz
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iec_jiffydos_detected:
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panic #$FF // WHOAAAA! He wants to speak jiffy, but I do not know this language yet!
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lda #$01 // JiffyDOS protocol
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iec_jiffydos_store_proto:
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sta IECPROTO
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@@ -0,0 +1,33 @@
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//
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// Arbitration code for normal/turbo transfer
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//
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#if CONFIG_IEC_JIFFYDOS
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iec_tx_dispatch:
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php // preserve C flag for EOI indication
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lda IECPROTO
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#if CONFIG_IEC_JIFFYDOS
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cmp #$01
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beq iec_tx_dispatch_jiffydos
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#endif // CONFIG_IEC_JIFFYDOS
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// FALLTROUGH
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iec_tx_dispatch_normal:
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plp
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jmp iec_tx_byte
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#if CONFIG_IEC_JIFFYDOS
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iec_tx_dispatch_jiffydos:
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plp
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jmp iec_tx_byte_jiffydos
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#endif // CONFIG_IEC_JIFFYDOS
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#endif // any turbo supported
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@@ -71,10 +71,18 @@ load_iec:
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// Get load address
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#if CONFIG_IEC_JIFFYDOS
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jsr iec_rx_dispatch
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#else // no turbo supported
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jsr iec_rx_byte
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#endif
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bcs load_iec_file_not_found
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sta EAL+0
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#if CONFIG_IEC_JIFFYDOS
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jsr iec_rx_dispatch
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#else // no turbo supported
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jsr iec_rx_byte
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#endif
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bcs load_iec_file_not_found
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sta EAL+1
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@@ -92,7 +100,11 @@ load_iec:
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iec_load_loop:
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// We are now ready to receive bytes
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||||
#if CONFIG_IEC_JIFFYDOS
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jsr iec_rx_dispatch
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#else // no turbo supported
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jsr iec_rx_byte
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#endif
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bcs load_iec_error
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// Handle the byte (store in memory / verify)
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+114
-102
@@ -1,102 +1,114 @@
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//
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||||
// IEC part of the SAVE routine
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||||
//
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||||
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||||
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#if CONFIG_IEC
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||||
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||||
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save_iec_dev_not_found:
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jmp lvs_device_not_found_error
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save_iec:
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||||
|
||||
// Check file name
|
||||
lda FNLEN
|
||||
beq_far kernalerror_FILE_NAME_MISSING
|
||||
|
||||
// Display SAVING
|
||||
jsr lvs_display_saving
|
||||
|
||||
// Call device to LISTEN
|
||||
lda FA
|
||||
jsr LISTEN
|
||||
bcs save_iec_dev_not_found
|
||||
|
||||
// Open channel 1 (reserved for file writing)
|
||||
lda #$01
|
||||
jsr iec_cmd_open
|
||||
bcs save_iec_dev_not_found
|
||||
|
||||
// Send file name
|
||||
jsr iec_send_file_name
|
||||
bcs save_iec_dev_not_found
|
||||
|
||||
// Call device to LISTEN once again
|
||||
lda FA
|
||||
jsr LISTEN
|
||||
bcs save_iec_dev_not_found
|
||||
|
||||
lda #$61 // open channel / data (p3) , required according to p13
|
||||
sta TBTCNT
|
||||
jsr iec_tx_command
|
||||
bcs save_iec_dev_not_found
|
||||
|
||||
// Save start address
|
||||
lda STAL+0
|
||||
sta TBTCNT
|
||||
clc
|
||||
jsr iec_tx_byte
|
||||
|
||||
lda STAL+1
|
||||
sta TBTCNT
|
||||
clc
|
||||
jsr iec_tx_byte
|
||||
|
||||
jsr lvs_setup_MEMUSS
|
||||
ldy #$00
|
||||
iec_save_loop:
|
||||
|
||||
// Retrieve byte to send
|
||||
#if CONFIG_MEMORY_MODEL_60K
|
||||
ldx #<MEMUSS+0
|
||||
jsr peek_under_roms
|
||||
#else // CONFIG_MEMORY_MODEL_38K
|
||||
lda (MEMUSS),y
|
||||
#endif
|
||||
|
||||
// Send the byte
|
||||
sta TBTCNT
|
||||
clc
|
||||
jsr iec_tx_byte
|
||||
|
||||
// Next iteration
|
||||
jsr lvs_advance_MEMUSS_check_EAL
|
||||
bne iec_save_loop
|
||||
|
||||
iec_save_loop_end:
|
||||
|
||||
// Close file on drive
|
||||
lda FA
|
||||
jsr UNLSN
|
||||
|
||||
lda FA
|
||||
jsr LISTEN
|
||||
|
||||
lda #$E1 // CLOSE command
|
||||
sta TBTCNT
|
||||
jsr iec_tx_command
|
||||
jsr iec_tx_command_finalize
|
||||
|
||||
// Tell drive to unlisten
|
||||
lda FA
|
||||
jsr UNLSN
|
||||
|
||||
// Return success
|
||||
clc
|
||||
rts
|
||||
|
||||
|
||||
#endif // CONFIG_IEC
|
||||
|
||||
//
|
||||
// IEC part of the SAVE routine
|
||||
//
|
||||
|
||||
|
||||
#if CONFIG_IEC
|
||||
|
||||
|
||||
save_iec_dev_not_found:
|
||||
jmp lvs_device_not_found_error
|
||||
|
||||
|
||||
save_iec:
|
||||
|
||||
// Check file name
|
||||
lda FNLEN
|
||||
beq_far kernalerror_FILE_NAME_MISSING
|
||||
|
||||
// Display SAVING
|
||||
jsr lvs_display_saving
|
||||
|
||||
// Call device to LISTEN
|
||||
lda FA
|
||||
jsr LISTEN
|
||||
bcs save_iec_dev_not_found
|
||||
|
||||
// Open channel 1 (reserved for file writing)
|
||||
lda #$01
|
||||
jsr iec_cmd_open
|
||||
bcs save_iec_dev_not_found
|
||||
|
||||
// Send file name
|
||||
jsr iec_send_file_name
|
||||
bcs save_iec_dev_not_found
|
||||
|
||||
// Call device to LISTEN once again
|
||||
lda FA
|
||||
jsr LISTEN
|
||||
bcs save_iec_dev_not_found
|
||||
|
||||
lda #$61 // open channel / data (p3) , required according to p13
|
||||
sta TBTCNT
|
||||
jsr iec_tx_command
|
||||
bcs save_iec_dev_not_found
|
||||
|
||||
// Save start address
|
||||
lda STAL+0
|
||||
sta TBTCNT
|
||||
clc
|
||||
#if CONFIG_IEC_JIFFYDOS
|
||||
jsr iec_tx_dispatch
|
||||
#else // no turbo supported
|
||||
jsr iec_tx_byte
|
||||
#endif
|
||||
|
||||
lda STAL+1
|
||||
sta TBTCNT
|
||||
clc
|
||||
#if CONFIG_IEC_JIFFYDOS
|
||||
jsr iec_tx_dispatch
|
||||
#else // no turbo supported
|
||||
jsr iec_tx_byte
|
||||
#endif
|
||||
|
||||
jsr lvs_setup_MEMUSS
|
||||
ldy #$00
|
||||
iec_save_loop:
|
||||
|
||||
// Retrieve byte to send
|
||||
#if CONFIG_MEMORY_MODEL_60K
|
||||
ldx #<MEMUSS+0
|
||||
jsr peek_under_roms
|
||||
#else // CONFIG_MEMORY_MODEL_38K
|
||||
lda (MEMUSS),y
|
||||
#endif
|
||||
|
||||
// Send the byte
|
||||
sta TBTCNT
|
||||
clc
|
||||
#if CONFIG_IEC_JIFFYDOS
|
||||
jsr iec_tx_dispatch
|
||||
#else // no turbo supported
|
||||
jsr iec_tx_byte
|
||||
#endif
|
||||
|
||||
// Next iteration
|
||||
jsr lvs_advance_MEMUSS_check_EAL
|
||||
bne iec_save_loop
|
||||
|
||||
iec_save_loop_end:
|
||||
|
||||
// Close file on drive
|
||||
lda FA
|
||||
jsr UNLSN
|
||||
|
||||
lda FA
|
||||
jsr LISTEN
|
||||
|
||||
lda #$E1 // CLOSE command
|
||||
sta TBTCNT
|
||||
jsr iec_tx_command
|
||||
jsr iec_tx_command_finalize
|
||||
|
||||
// Tell drive to unlisten
|
||||
lda FA
|
||||
jsr UNLSN
|
||||
|
||||
// Return success
|
||||
clc
|
||||
rts
|
||||
|
||||
|
||||
#endif // CONFIG_IEC
|
||||
@@ -26,6 +26,16 @@ TALK:
|
||||
// Encode and execute the command
|
||||
ora #$40
|
||||
|
||||
#if CONFIG_IEC_JIFFYDOS
|
||||
|
||||
// XXX temporary, until receiving is implemented too
|
||||
sta TBTCNT
|
||||
lda #$00 // standard protocol
|
||||
sta IECPROTO
|
||||
jmp iec_tx_command
|
||||
|
||||
#endif // CONFIG_IEC_JIFFYDOS
|
||||
|
||||
common_talk_listen: // common part of TALK and LISTEN
|
||||
|
||||
sta TBTCNT
|
||||
|
||||
Reference in new issue
Block a user