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Added MEGA65 DMA.h and a (non-working) test.
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jespergravgaard
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137
src/main/kc/include/mega65-dma.h
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137
src/main/kc/include/mega65-dma.h
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// MEGA65 DMA
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// Appendix J in https://mega.scryptos.com/sharefolder-link/MEGA/MEGA65+filehost/Docs/MEGA65-Book_draft.pdf
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// C65 Manual http://www.zimmers.net/cbmpics/cbm/c65/c65manual.txt
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// DMA lists https://raw.githubusercontent.com/MEGA65/c65-specifications/master/c65manualupdated.txt
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// DMA lists https://c65gs.blogspot.com/2019/03/auto-detecting-required-revision-of.html
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// DMA list options https://c65gs.blogspot.com/2018/01/improving-dmagic-controller-interface.html
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// DMAgic VHDL source https://github.com/MEGA65/mega65-core/blob/master/src/vhdl/gs4510.vhdl#L4364
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// Xemu emulator source https://github.com/lgblgblgb/xemu/blob/master/xemu/f018_core.c
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// Registers of the MEGA65 enchanced F018 DMAgic Controller
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struct F018_DMAGIC {
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// $D700 ADDRLSBTRIG DMAgic DMA list address LSB, and trigger DMA (when written).
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// We also clear out the upper address bits in case an enhanced job had set them.
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char ADDRLSBTRIG;
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// $D701 ADDRMSB DMA list address high byte (address bits 8 -- 15).
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char ADDRMSB;
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// $D702 ADDRBANK DMA list address bank (address bits 16 -- 22). Writing clears $D704.
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char ADDRBANK;
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// $D703 EN018B DMA enable F018B mode (adds sub-command byte )
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// bit 0 enable F018B mode.
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char EN018B;
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// $D704 ADDRMB DMA list address mega-byte
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char ADDRMB;
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// $D705 ETRIG Set low-order byte of DMA list address, and trigger Enhanced DMA job
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// Works like $D700, but enables DMA option lists.
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char ETRIG;
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// $D706-$D70D Unused
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char UNUSED1[8];
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// $D70E ADDRLSB DMA list address low byte (address bits 0 -- 7) WITHOUT STARTING A DMA JOB
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// (used by Hypervisor for unfreezing DMA-using tasks)
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char ADDRLSB;
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// $D70F Unused
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char UNUSED2;
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// $D710 MISC (non-DMA) options
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// $D710.0 - MISC:BADLEN Enable badline emulation
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// $D710.1 - MISC:SLIEN Enable 6502-style slow (7 cycle) interrupts
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// $D710.2 - MISC:VDCSEN Enable VDC interface simulation
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char MISC;
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};
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// F018A DMA list entry
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struct DMA_LIST_F018A {
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// DMA command
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// 0-1 command (00: copy, 01: mix (unsupported) 10: swap (unsupported) 11: fill )
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// 2 chain
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// 3 allow interrupt (unsupported)
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char command;
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// Count of bytes to copy/fill
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unsigned int count;
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// Source address (low byte is used as data for command fill)
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char* src;
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// Source address bank
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// bits
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// 7 src I/O
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// 6 src direction
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// 5 src modulo
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// 4 src hold
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// 0-3 address bank
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char src_bank;
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// Destination address
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char* dest;
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// Destination address bank
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// bits
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// 7 dest I/O
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// 6 dest direction
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// 5 dest modulo
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// 4 dest hold
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// 0-3 address bank
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char dest_bank;
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// Modulo value (unused)
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unsigned int modulo;
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};
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// F018B DMA list entry
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struct DMA_LIST_F018B {
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// DMA command (format F018B)
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// bits
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// 0-1 command (00: copy, 01: mix (unsupported) 10: swap (unsupported) 11: fill )
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// 2 chain
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// 3 allow interrupt (unsupported)
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// 4 src direction
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// 5 dest direction
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char command;
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// Count of bytes to copy/fill
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unsigned int count;
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// Source address (low byte is used as data for command fill)
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char* src;
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// Source address bank
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// bits
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// 7 src I/O
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// 0-6 dest address bank
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char src_bank;
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// Destination address
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char* dest;
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// Destination address bank
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// bits
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// 7 dest I/O
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// 0-6 dest address bank
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char dest_bank;
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// Sub-command
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// bits
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// 0 src modulo (unsupported)
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// 1 src hold
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// 2 dest modulo (unsupported)
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// 3 dest hold
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char sub_command;
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// Modulo value (unused)
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unsigned int modulo;
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};
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// DMA command copy
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const char DMA_COMMAND_COPY = 0x00;
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// DMA command fill
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const char DMA_COMMAND_FILL = 0x03;
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// DMA command fill
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const char DMA_COMMAND_CHAIN = 0x04;
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// DMA command source direction
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const char DMA_COMMAND_SRC_DIR = 0x10;
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// DMA command destination direction
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const char DMA_COMMAND_DEST_DIR = 0x20;
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// Extended DMA Option Prefixes
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// $00 = End of options
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// $06 = Use $86 $xx transparency value (don't write source bytes to destination, if byte value matches $xx)
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// $07 = Disable $86 $xx transparency value.
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// $0A = Use F018A list format
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// $0B = Use F018B list format
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// $80 $xx = Set MB of source address
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// $81 $xx = Set MB of destination address
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// $82 $xx = Set source skip rate (/256ths of bytes)
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// $83 $xx = Set source skip rate (whole bytes)
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// $84 $xx = Set destination skip rate (/256ths of bytes)
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// $85 $xx = Set destination skip rate (whole bytes)
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// $86 $xx = Don't write to destination if byte value = $xx, and option $06 enabled
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@ -8,6 +8,7 @@
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#include <mos4569.h>
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#include <mega65-viciv.h>
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#include <mega65-memorymapper.h>
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#include <mega65-dma.h>
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// I/O Personality selection
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volatile char * const IO_KEY = 0xd02f;
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@ -33,25 +34,26 @@ const char PROCPORT_KERNEL_IO = 0b00000110;
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// BASIC in 0xA000, I/O in 0xD000, KERNEL in 0xE000
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const char PROCPORT_BASIC_KERNEL_IO = 0b00000111;
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// The address of the CHARGEN character set
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char * const CHARGEN = 0xd000;
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// The SID MOS 6581/8580
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struct MOS6581_SID * const SID = 0xd400;
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// The VIC-II MOS 6567/6569
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struct MOS6569_VICII* const VICII = 0xd000;
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// The VIC III MOS 4567/4569
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struct MOS4569_VICIII* const VICIII = 0xd000;
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// The VIC IV
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struct MEGA65_VICIV* const VICIV = 0xd000;
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// Color Ram
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char * const COLORRAM = 0xd800;
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// The address of the CHARGEN character set
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char * const CHARGEN = 0xd000;
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// Palette RED
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char * const PALETTE_RED = 0xd100;
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// Palette GREEN
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char * const PALETTE_GREEN = 0xd200;
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// Palette BLUE
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char * const PALETTE_BLUE = 0xd300;
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// The SID MOS 6581/8580
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struct MOS6581_SID * const SID = 0xd400;
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// DMAgic F018 Controller
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struct F018_DMAGIC * const DMA = 0xd700;
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// Color Ram
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char * const COLORRAM = 0xd800;
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// Default address of screen character matrix
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#ifdef __MEGA65_C64__
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@ -1,8 +1,27 @@
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// Tests the MEGA65 DMA
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// MEGA65 DMA test
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// Appendix J in https://mega.scryptos.com/sharefolder-link/MEGA/MEGA65+filehost/Docs/MEGA65-Book_draft.pdf
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// C65 Manual http://www.zimmers.net/cbmpics/cbm/c65/c65manual.txt
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// DMA lists https://raw.githubusercontent.com/MEGA65/c65-specifications/master/c65manualupdated.txt
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// DMA lists https://c65gs.blogspot.com/2019/03/auto-detecting-required-revision-of.html
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// DMA list options https://c65gs.blogspot.com/2018/01/improving-dmagic-controller-interface.html
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// DMAgic VHDL source https://github.com/MEGA65/mega65-core/blob/master/src/vhdl/gs4510.vhdl#L4364
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#pragma target(mega65)
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#include <mega65.h>
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void main() {
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// Enable enable F018B mode
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DMA->EN018B = 1;
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// Set address of DMA list
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DMA->ADDRMB = 0;
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DMA->ADDRBANK = 0;
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DMA-> ADDRMSB = >&DMA_SCREEN_UP;
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// Trigger the DMA (without option lists)
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DMA-> ADDRLSBTRIG = <&DMA_SCREEN_UP;
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}
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// DMA list entry that scrolls the default screen up
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struct DMA_LIST_F018B DMA_SCREEN_UP = {
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DMA_COMMAND_COPY, // command
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24*80, // count
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DEFAULT_SCREEN+80, // source
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0, // source bank
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DEFAULT_SCREEN, // destination
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0, // destination bank
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0, // sub-command
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0 // modulo-value
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};
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