Reading nes file inputs and extracting data from header.
Creating rom image struct/object to store rom header data.
This commit is contained in:
paul eeepc
parent
497e53378b
commit
8654a8f4bf
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@ -2,6 +2,7 @@
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int detect_console( cartridge *cart, USBtransfer *transfer )
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{
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printf("attempting to detect cartridge...\n");
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//always start with resetting i/o
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io_reset( transfer );
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@ -58,11 +59,29 @@ int detect_console( cartridge *cart, USBtransfer *transfer )
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//always end with resetting i/o
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io_reset( transfer );
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switch (cart->console) {
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case NES_CART: printf("NES cartridge detected!\n");
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break;
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case FC_CART: printf("Famicom cartridge detected!\n");
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break;
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case SNES_CART: printf("SNES cartridge detected!\n");
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break;
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case BKWD_CART: log_err("CARTRIDGE INSERTED BACKWARDS!!!\n");
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//TODO detection not yet implemented need to look over connector pinouts
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break;
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case UNKNOWN: printf("Unable to detect cartridge...\n");
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//TODO error out properly
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break;
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default:
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sentinel("cartridge console element got set to something unsupported.");
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}
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return SUCCESS;
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}
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error:
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return -1;
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}
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//Can detect INL discrete, XO, and possily others with pullup EXP0 test
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//These carts have pullups on EXP0 so rising edge is faster
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@ -73,4 +92,3 @@ int detect_console( cartridge *cart, USBtransfer *transfer )
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//INL SNES boards memory mapping is controlled by /RESET pin
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//roms are still visible when /RESET low, but SRAM isn't
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@ -0,0 +1,87 @@
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#include "file.h"
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#define SIZE_NES_HEADER 16
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#define SIZE_PRG_BANK 16384
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#define SIZE_CHR_BANK 8192
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int detect_file( rom_image *rom_info, char *filename )
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{
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int rv = 0;
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// int index = 0;
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FILE *fileptr = NULL;
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//warn uint8_t data[128];
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//first open file
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fileptr = fopen( filename, "rb");
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//returns file ptr on success, NULL on fail
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check( fileptr, "Unable to open file: %s in read binary mode", filename);
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//then determine file type
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uint8_t header[SIZE_NES_HEADER];
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//size_t fread(void *ptr, size_t size, size_t nmemb, FILE *stream);
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rv = fread( header, sizeof(header[0]), (sizeof(header)/sizeof(header[0])), fileptr);
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check( rv = sizeof(header), "Unable to read NES header");
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//for ( index = 0; index < SIZE_NES_HEADER; index++ ) {
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// debug("header byte #%d = h%x c%c", index, header[index], header[index]);
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//}
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//0-3: Constant $4E $45 $53 $1A ("NES" followed by MS-DOS end-of-file)
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if ( (header[0]=='N') && (header[1]=='E') && (header[2]=='S') && (header[3]==0x1A) ) {
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debug("detected ines header");
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rom_info->console = NES_CART;
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} else {
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debug("only ines files currently accepted as input");
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goto error;
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}
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//4: Size of PRG ROM in 16 KB units
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rom_info->prg_size = header[4] * SIZE_PRG_BANK;
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debug("PRG ROM size= %d", rom_info->prg_size);
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//5: Size of CHR ROM in 8 KB units (Value 0 means the board uses CHR RAM)
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rom_info->chr_size = header[5] * SIZE_CHR_BANK;
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debug("CHR ROM size= %d", rom_info->chr_size);
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//6: Flags 6
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// 76543210
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// ||||||||
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// ||||+||+- 0xx0: vertical arrangement/horizontal mirroring (CIRAM A10 = PPU A11)
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// |||| || 0xx1: horizontal arrangement/vertical mirroring (CIRAM A10 = PPU A10)
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// |||| || 1xxx: four-screen VRAM
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// |||| |+-- 1: Cartridge contains battery-backed PRG RAM ($6000-7FFF) or other persistent memory
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// |||| +--- 1: 512-byte trainer at $7000-$71FF (stored before PRG data)
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// ++++----- Lower nybble of mapper number
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rom_info->mapper = (header[6]>>4);
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rom_info->mapper |= (header[7] & 0xF0);
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debug("mapper #%d", rom_info->mapper);
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rom_info->mirroring = header[6] & 0x09; //0b0000 1001
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debug("mirroring:%x", rom_info->mirroring);
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//7: Flags 7
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// 76543210
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// ||||||||
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// |||||||+- VS Unisystem
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// ||||||+-- PlayChoice-10 (8KB of Hint Screen data stored after CHR data)
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// ||||++--- If equal to 2, flags 8-15 are in NES 2.0 format
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// ++++----- Upper nybble of mapper number
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//8: Size of PRG RAM in 8 KB units (Value 0 infers 8 KB for compatibility; see PRG RAM circuit)
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//9: Flags 9
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//10: Flags 10 (unofficial)
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//11-15: Zero filled
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//close file
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check( fclose(fileptr) == SUCCESS, "Unable to close file");
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fileptr = NULL;
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return 0;
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error:
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if (fileptr) {
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fclose(fileptr);
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}
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return -1;
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}
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@ -0,0 +1,34 @@
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#ifndef _file_h
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#define _file_h
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//uncomment to DEBUG this file alone
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#define DEBUG
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//"make debug" to get DEBUG msgs on entire program
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#include "dbg.h"
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <assert.h>
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#include <errno.h>
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#include <libusb.h>
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//TODO put defintions in separate project wide .h file
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#include "cartridge.h"
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//cartridge object/struct
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typedef struct rom_image{
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int console; //console the cart plays in
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int mapper; //mapper number of the board
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int submap;
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int mapvariant;
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int prg_size;
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int chr_size;
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int ram_size;
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int battery;
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int mirroring;
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} rom_image;
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int detect_file( rom_image *rom_info, char *filename );
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#endif
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@ -18,6 +18,7 @@
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#include "erase.h"
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#include "test.h"
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#include "cartridge.h"
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#include "file.h"
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int main(int argc, char *argv[])
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@ -163,17 +164,6 @@ int main(int argc, char *argv[])
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libusb_log = atoi(L_value);
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check( ((libusb_log >= LIBUSB_LOG_LEVEL_NONE) && (libusb_log <=LIBUSB_LOG_LEVEL_DEBUG)),
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"Invalid LIBUSB_LOG_LEVEL: %d, must be from 0 to 4", libusb_log );
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printf("setting LIBUSB_LOG_LEVEL to: %d\n", libusb_log);
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if (libusb_log == 0) {
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printf("\tNONE: default no messages ever printed by library\n"); }
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if (libusb_log == 1) {
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printf("\tERROR: error messages are printed to stderr\n"); }
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if (libusb_log == 2) {
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printf("\tWARNING: warning and error messages are printed to stderr\n"); }
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if (libusb_log == 3) {
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printf("\tINFO: informational, warning, & error messages are printed to stdout\n"); }
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if (libusb_log == 4) {
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printf("\tDEBUG: debug, info, warning, & error messages are printed to stdout\n"); }
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}
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//open INL retro prog with firmware version 2.0 or greater
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if (K_value != NULL) {
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@ -182,9 +172,6 @@ int main(int argc, char *argv[])
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transfer->handle = open_usb_device( context, libusb_log );
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check( transfer->handle != NULL, "Unable to open INL retro-prog usb device handle.");
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//report successful connection to INL retro-prog
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printf("Successfully found and connected to INL retro-prog with firmware version 2.0\n");
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//TEST flag for development use to provide means to only call test.c functions
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if (T_flag) {
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test_function( transfer );
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@ -199,31 +186,52 @@ int main(int argc, char *argv[])
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cart->console = UNKNOWN;
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// -x flag turns off all autodection
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if (!x_flag) {
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printf("attempting to detect cartridge...\n");
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detect_console( cart, transfer );
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switch (cart->console) {
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case NES_CART: printf("NES cartridge detected!\n");
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break;
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case FC_CART: printf("Famicom cartridge detected!\n");
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break;
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case SNES_CART: printf("SNES cartridge detected!\n");
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break;
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case BKWD_CART: log_err("CARTRIDGE INSERTED BACKWARDS!!!\n");
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break;
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case UNKNOWN: printf("Unable to detect cartridge...\n");
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break;
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default:
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sentinel("cartridge console element got set to something unsupported.");
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}
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check(!detect_console( cart, transfer ), "Problem detecting cartridge.");
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} else {
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printf("auto-detection turned off\n");
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}
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//detect mapper as much as possible
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//detect board manufacturer/flash memories as much as possible
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//detect rom sizes as much as possible
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//read in user files/args that glean info about expected board
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//create file object/struct
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rom_image *rom_info = malloc( sizeof(rom_image));
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check_mem(rom_info);
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//for now just assume user file/args are correct
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if ( p_value != NULL ) {
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//program file provided at commandline
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detect_file( rom_info, p_value );
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}
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//compare detections to user args and get permission to continue if there are discrepencies
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//if flashing, determine if erasures are necessary and where
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//erase required sectors of flash
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//forced to erase board regardless of current status
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if (e_flag) {
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erase_nes( transfer );
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}
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//if flashing determine auto-doubling for oversized flash
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//determine if rom can be flashed in a manner to make board compatible with rom
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//ie CNROM/colordreams can be over flashed to play NROM
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//BNROM can be overflashed to simulate UNROM
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//SUROM can be overflashed to run as SNROM
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//determine if snes input rom needs deinterleaved
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//dump or flash data based on user args
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//find some fun trivia to present to user while waiting for flash operatoin..?
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//perform CRC checking to check integrity of dump/flash operation
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//handle simple LED ON/OFF within main for now
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//TODO cut this newbie code out of here
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@ -37,6 +37,23 @@ libusb_device_handle * open_usb_device( libusb_context *context, int log_level )
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if (log_level>0) printf("Successfully initalized libusb\n");
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//void libusb_set_debug ( libusb_context * ctx, int level )
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if ( log_level>0) {
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printf("setting LIBUSB_LOG_LEVEL to: %d\n", log_level);
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switch ( log_level) {
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case 1:
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printf("\tERROR: error messages are printed to stderr\n");
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break;
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case 2:
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printf("\tWARNING: warning and error messages are printed to stderr\n");
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break;
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case 3:
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printf("\tINFO: informational, warning, & error messages are printed to stdout\n");
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break;
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case 4:
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printf("\tDEBUG: debug, info, warning, & error messages are printed to stdout\n");
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break;
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}
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}
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libusb_set_debug(context, log_level);
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//discover all usb devices
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@ -155,6 +172,8 @@ libusb_device_handle * open_usb_device( libusb_context *context, int log_level )
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//
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// 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().
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//report successful connection to INL retro-prog
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printf("Successfully found and connected to INL retro-prog with firmware version 2.0\n");
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//free device list if it was left open
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if (device_list) {
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