84 lines
3.0 KiB
C
84 lines
3.0 KiB
C
#ifndef _shared_dict_nes_h
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#define _shared_dict_nes_h
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//define dictionary's reference number in the shared_dictionaries.h file
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//then include this dictionary file in shared_dictionaries.h
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//The dictionary number is literally used as usb transfer request field
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//the opcodes and operands in this dictionary are fed directly into usb setup packet's wValue wIndex fields
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//=============================================================================================
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//=============================================================================================
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// NES DICTIONARY
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//
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// opcodes contained in this dictionary must be implemented in firmware/source/nes.c
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//
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//=============================================================================================
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//=============================================================================================
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// OPCODES with no operand and no return value besides SUCCESS/ERROR_CODE
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//=============================================================================================
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// OPCODES WITH OPERAND and no return value besides SUCCESS/ERROR_CODE
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//=============================================================================================
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// 0x00-0x7F
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// Detect this opcode/operand setup with opcode between the following defines:
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#define NES_OPCODE_24BOP_MIN 0x00
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#define NES_OPCODE_24BOP_MAX 0x7F
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//
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//=============================================================================================
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//=============================================================================================
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//Discrete board PRG-ROM only write, does not write to mapper
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//This is a /WE controlled write with data latched on rising edge EXP0
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//PRG-ROM /WE <- EXP0 w/PU
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//PRG-ROM /OE <- /ROMSEL
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//PRG-ROM /CE <- GND
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//PRG-ROM write: /WE & /CE low, /OE high
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//mapper '161 CLK <- /ROMSEL
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//mapper '161 /LOAD <- PRG R/W
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//wValueMSB: data
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//wIndex: address
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#define DISCRETE_EXP0_PRGROM_WR 0x00
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#define NES_PPU_WR 0x01
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//generic CPU write with M2 toggle as expected with NES CPU
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// A15 decoded to enable /ROMSEL as it should
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#define NES_CPU_WR 0x02
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//=============================================================================================
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// OPCODES WITH OPERAND AND RETURN VALUE plus SUCCESS/ERROR_CODE
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//=============================================================================================
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//
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//
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#define NES_OPCODE_16BOP_8BRV_MIN 0x80
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#define NES_OPCODE_16BOP_8BRV_MAX 0xFF
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//
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//=============================================================================================
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//=============================================================================================
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//read from NES CPU ADDRESS
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//set /ROMSEL, M2, and PRG R/W
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//read from cartridge just as NES's CPU would
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//nice and slow trying to be more like the NES
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#define EMULATE_NES_CPU_RD 0x80
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//like the one above but not so slow..
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#define NES_CPU_RD 0x81
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#define NES_PPU_RD 0x82
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//doesn't have operands just returns sensed CIRAM A10 mirroring
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//returns VERT/HORIZ/1SCNA/1SCNB from shared_enums.h
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#define CIRAM_A10_MIRROR 0x83
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#endif
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