Reading nes file inputs and extracting data from header.

Creating rom image struct/object to store rom header data.

host/source/cartridge.c

@@ -2,6 +2,7 @@
 
 int detect_console( cartridge *cart, USBtransfer *transfer ) 
 {
+	printf("attempting to detect cartridge...\n");
 	//always start with resetting i/o
 	io_reset( transfer );
 
@@ -58,11 +59,29 @@ int detect_console( cartridge *cart, USBtransfer *transfer )
 	//always end with resetting i/o
 	io_reset( transfer );
 
+	switch (cart->console) {
+		case NES_CART: printf("NES cartridge detected!\n");	
+			break;
+		case FC_CART: printf("Famicom cartridge detected!\n");	
+			break;
+		case SNES_CART: printf("SNES cartridge detected!\n");	
+			break;
+		case BKWD_CART: log_err("CARTRIDGE INSERTED BACKWARDS!!!\n");	
+			//TODO detection not yet implemented need to look over connector pinouts
+			break;
+		case UNKNOWN: printf("Unable to detect cartridge...\n");
+			//TODO error out properly
+			break;
+		default:
+			sentinel("cartridge console element got set to something unsupported.");
+	}
 
 	return SUCCESS;
 
-}
+error:
+	return -1;
 
+}
 
 	//Can detect INL discrete, XO, and possily others with pullup EXP0 test
 	//These carts have pullups on EXP0 so rising edge is faster
@@ -73,4 +92,3 @@ int detect_console( cartridge *cart, USBtransfer *transfer )
 	//INL SNES boards memory mapping is controlled by /RESET pin
 	//roms are still visible when /RESET low, but SRAM isn't
 
-

host/source/file.c

@@ -0,0 +1,87 @@
+#include "file.h"
+
+#define SIZE_NES_HEADER 16
+#define SIZE_PRG_BANK 16384
+#define SIZE_CHR_BANK 8192
+
+int detect_file( rom_image *rom_info, char *filename ) 
+{
+	int rv = 0;
+//	int index = 0;
+	FILE *fileptr = NULL;
+//warn	uint8_t data[128];
+
+	//first open file
+	fileptr = fopen( filename, "rb");
+	//returns file ptr on success, NULL on fail
+	check( fileptr, "Unable to open file: %s in read binary mode", filename); 	
+
+	//then determine file type
+	uint8_t header[SIZE_NES_HEADER];
+	//size_t fread(void *ptr, size_t size, size_t nmemb, FILE *stream);
+	rv = fread( header, sizeof(header[0]), (sizeof(header)/sizeof(header[0])), fileptr);
+	check( rv = sizeof(header), "Unable to read NES header");
+
+	//for ( index = 0; index < SIZE_NES_HEADER; index++ ) {
+	//	debug("header byte #%d = h%x c%c", index, header[index], header[index]);
+	//}
+
+	//0-3: Constant $4E $45 $53 $1A ("NES" followed by MS-DOS end-of-file)
+	if ( (header[0]=='N') && (header[1]=='E') && (header[2]=='S') && (header[3]==0x1A) ) {
+		debug("detected ines header");
+		rom_info->console = NES_CART;
+	} else {
+		debug("only ines files currently accepted as input");
+		goto error;
+	}
+
+	//4: Size of PRG ROM in 16 KB units
+	rom_info->prg_size = header[4] * SIZE_PRG_BANK;
+	debug("PRG ROM size= %d", rom_info->prg_size);
+
+	//5: Size of CHR ROM in 8 KB units (Value 0 means the board uses CHR RAM)
+	rom_info->chr_size = header[5] * SIZE_CHR_BANK;
+	debug("CHR ROM size= %d", rom_info->chr_size);
+
+	//6: Flags 6
+	//   76543210
+	//   ||||||||
+	//   ||||+||+- 0xx0: vertical arrangement/horizontal mirroring (CIRAM A10 = PPU A11)
+	//   |||| ||   0xx1: horizontal arrangement/vertical mirroring (CIRAM A10 = PPU A10)
+	//   |||| ||   1xxx: four-screen VRAM
+	//   |||| |+-- 1: Cartridge contains battery-backed PRG RAM ($6000-7FFF) or other persistent memory
+	//   |||| +--- 1: 512-byte trainer at $7000-$71FF (stored before PRG data)
+	//   ++++----- Lower nybble of mapper number
+	rom_info->mapper = (header[6]>>4);
+	rom_info->mapper |= (header[7] & 0xF0);
+	debug("mapper #%d", rom_info->mapper);
+	rom_info->mirroring = header[6] & 0x09;	//0b0000 1001
+	debug("mirroring:%x", rom_info->mirroring);
+	//7: Flags 7
+	//   76543210
+	//   ||||||||
+	//   |||||||+- VS Unisystem
+	//   ||||||+-- PlayChoice-10 (8KB of Hint Screen data stored after CHR data)
+	//   ||||++--- If equal to 2, flags 8-15 are in NES 2.0 format
+	//   ++++----- Upper nybble of mapper number
+
+	//8: Size of PRG RAM in 8 KB units (Value 0 infers 8 KB for compatibility; see PRG RAM circuit)
+	//9: Flags 9
+	//10: Flags 10 (unofficial)
+	//11-15: Zero filled
+	
+	//close file
+	check( fclose(fileptr) == SUCCESS, "Unable to close file");
+	fileptr = NULL;
+	
+	return 0;
+
+error:
+
+	if (fileptr) {
+		fclose(fileptr);
+	}
+
+	return -1;
+
+}

host/source/file.h

@@ -0,0 +1,34 @@
+#ifndef _file_h
+#define _file_h
+
+//uncomment to DEBUG this file alone
+#define DEBUG
+//"make debug" to get DEBUG msgs on entire program
+#include "dbg.h"
+
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <assert.h>
+#include <errno.h>
+#include <libusb.h>
+
+//TODO put defintions in separate project wide .h file
+#include "cartridge.h"
+
+//cartridge object/struct
+typedef struct rom_image{
+	int	console;	//console the cart plays in
+	int	mapper;		//mapper number of the board
+	int	submap;
+	int	mapvariant;	
+	int	prg_size;
+	int	chr_size;
+	int	ram_size;
+	int	battery;
+	int	mirroring;
+} rom_image;
+
+int detect_file( rom_image *rom_info, char *filename );
+
+#endif

host/source/inlprog.c

@@ -18,6 +18,7 @@
 #include "erase.h"
 #include "test.h"
 #include "cartridge.h"
+#include "file.h"
 
 
 int main(int argc, char *argv[]) 
@@ -163,17 +164,6 @@ int main(int argc, char *argv[])
 		libusb_log = atoi(L_value);
 		check( ((libusb_log >= LIBUSB_LOG_LEVEL_NONE) && (libusb_log <=LIBUSB_LOG_LEVEL_DEBUG)), 
 		    "Invalid LIBUSB_LOG_LEVEL: %d, must be from 0 to 4", libusb_log );
-		printf("setting LIBUSB_LOG_LEVEL to: %d\n", libusb_log);
-		if (libusb_log == 0) { 
-			printf("\tNONE: default no messages ever printed by library\n"); }
-		if (libusb_log == 1) { 
-			printf("\tERROR: error messages are printed to stderr\n"); }
-		if (libusb_log == 2) { 
-			printf("\tWARNING: warning and error messages are printed to stderr\n"); }
-		if (libusb_log == 3) { 
-			printf("\tINFO: informational, warning, & error messages are printed to stdout\n"); }
-		if (libusb_log == 4) { 
-			printf("\tDEBUG: debug, info, warning, & error messages are printed to stdout\n"); }
 	}
 	//open INL retro prog with firmware version 2.0 or greater
 	if (K_value != NULL) {
@@ -182,9 +172,6 @@ int main(int argc, char *argv[])
 	transfer->handle = open_usb_device( context, libusb_log );
 	check( transfer->handle != NULL, "Unable to open INL retro-prog usb device handle.");
 	
-	//report successful connection to INL retro-prog
-	printf("Successfully found and connected to INL retro-prog with firmware version 2.0\n");
-
 	//TEST flag for development use to provide means to only call test.c functions
 	if (T_flag) {
 		test_function( transfer );
@@ -199,31 +186,52 @@ int main(int argc, char *argv[])
 	cart->console = UNKNOWN;
 	// -x flag turns off all autodection
 	if (!x_flag) {
-		printf("attempting to detect cartridge...\n");
+		check(!detect_console( cart, transfer ), "Problem detecting cartridge.");	
-		detect_console( cart, transfer );	
-		switch (cart->console) {
-			case NES_CART: printf("NES cartridge detected!\n");	
-				break;
-			case FC_CART: printf("Famicom cartridge detected!\n");	
-				break;
-			case SNES_CART: printf("SNES cartridge detected!\n");	
-				break;
-			case BKWD_CART: log_err("CARTRIDGE INSERTED BACKWARDS!!!\n");	
-				break;
-			case UNKNOWN: printf("Unable to detect cartridge...\n");
-				break;
-			default:
-				sentinel("cartridge console element got set to something unsupported.");
-		}
 	} else {
 		printf("auto-detection turned off\n");
 	}
 
+	//detect mapper as much as possible
+
+	//detect board manufacturer/flash memories as much as possible
+
+	//detect rom sizes as much as possible
+
+	//read in user files/args that glean info about expected board
+	//create file object/struct 
+	rom_image *rom_info = malloc( sizeof(rom_image));	
+	check_mem(rom_info);
+	//for now just assume user file/args are correct
+	if ( p_value != NULL ) {
+		//program file provided at commandline
+		detect_file( rom_info, p_value );
+	}
+
+	//compare detections to user args and get permission to continue if there are discrepencies
+
+	//if flashing, determine if erasures are necessary and where
+
+	//erase required sectors of flash
+
 	//forced to erase board regardless of current status
 	if (e_flag) {
 		erase_nes( transfer );
 	}
 
+	//if flashing determine auto-doubling for oversized flash
+
+	//determine if rom can be flashed in a manner to make board compatible with rom
+	//ie CNROM/colordreams can be over flashed to play NROM
+	//BNROM can be overflashed to simulate UNROM
+	//SUROM can be overflashed to run as SNROM
+
+	//determine if snes input rom needs deinterleaved
+
+	//dump or flash data based on user args
+
+	//find some fun trivia to present to user while waiting for flash operatoin..?
+
+	//perform CRC checking to check integrity of dump/flash operation
 
 	//handle simple LED ON/OFF within main for now
 	//TODO cut this newbie code out of here

host/source/usb_operations.c

@@ -37,6 +37,23 @@ libusb_device_handle * open_usb_device( libusb_context *context, int log_level )
 	if (log_level>0) printf("Successfully initalized libusb\n");
 
 	//void libusb_set_debug ( libusb_context *  ctx, int  level ) 
+	if ( log_level>0) {
+		printf("setting LIBUSB_LOG_LEVEL to: %d\n", log_level);
+		switch ( log_level) {
+			case 1:
+			printf("\tERROR: error messages are printed to stderr\n");
+			break;
+			case 2:
+			printf("\tWARNING: warning and error messages are printed to stderr\n");
+			break;
+			case 3:
+			printf("\tINFO: informational, warning, & error messages are printed to stdout\n");
+			break;
+			case 4:
+			printf("\tDEBUG: debug, info, warning, & error messages are printed to stdout\n");
+			break;
+		}
+	}
 	libusb_set_debug(context, log_level);
 
 	//discover all usb devices
@@ -155,6 +172,8 @@ libusb_device_handle * open_usb_device( libusb_context *context, int log_level )
 	//
 	//     As an implementation detail, libusb_open() actually adds a reference to the device in question. This is because the device remains available through the handle via libusb_get_device(). The reference is deleted during libusb_close(). 
 
+	//report successful connection to INL retro-prog
+	printf("Successfully found and connected to INL retro-prog with firmware version 2.0\n");
 
 	//free device list if it was left open
 	if (device_list) {