#ifndef _shared_dict_nes_h
#define _shared_dict_nes_h

//define dictionary's reference number in the shared_dictionaries.h file
//then include this dictionary file in shared_dictionaries.h
//The dictionary number is literally used as usb transfer request field
//the opcodes and operands in this dictionary are fed directly into usb setup packet's wValue wIndex fields


//=============================================================================================
//=============================================================================================
// NES DICTIONARY
//
// opcodes contained in this dictionary must be implemented in firmware/source/nes.c
//
//=============================================================================================
//=============================================================================================


//	OPCODES with no operand and no return value besides SUCCESS/ERROR_CODE

//Discrete board PRG-ROM only write, does not write to mapper
//This is a /WE controlled write with data latched on rising edge EXP0
//PRG-ROM /WE <- EXP0 w/PU
//PRG-ROM /OE <- /ROMSEL
//PRG-ROM /CE <- GND
//PRG-ROM write: /WE & /CE low, /OE high
//mapper '161 CLK  <- /ROMSEL
//mapper '161 /LOAD <- PRG R/W
//wValueMSB: data
//wIndex: address
#define DISCRETE_EXP0_PRGROM_WR		0x00

#define NES_PPU_WR			0x01

//generic CPU write with M2 toggle as expected with NES CPU
// A15 decoded to enable /ROMSEL as it should
#define NES_CPU_WR			0x02

//=============================================================================================
//	OPCODES WITH OPERAND AND RETURN VALUE plus SUCCESS/ERROR_CODE
//=============================================================================================

//read from NES CPU ADDRESS
//set /ROMSEL, M2, and PRG R/W
//read from cartridge just as NES's CPU would
//nice and slow trying to be more like the NES
#define EMULATE_NES_CPU_RD		0x80	//RL=3

//like the one above but not so slow..
#define NES_CPU_RD			0x81	//RL=3

#define NES_PPU_RD			0x82	//RL=3

//doesn't have operands just returns sensed CIRAM A10 mirroring 
#define CIRAM_A10_MIRROR		0x83	//RL=3
//returns VERT/HORIZ/1SCNA/1SCNB values:
	#define	MIR_1SCNA	0x10
	#define	MIR_1SCNB	0x11
	#define	MIR_VERT	0x12
	#define	MIR_HORZ	0x13


#endif