110 lines
3.6 KiB
Lua
110 lines
3.6 KiB
Lua
|
|
-- create the module's table
|
|
local cart = {}
|
|
|
|
-- import required modules
|
|
local dict = require "scripts.app.dict"
|
|
local nes = require "scripts.app.nes"
|
|
|
|
-- file constants
|
|
|
|
-- global variables so other modules can use them
|
|
cart_console = nil
|
|
|
|
-- local functions
|
|
local function detect_console( debug )
|
|
|
|
print("attempting to detect cartridge...");
|
|
-- //always start with resetting i/o
|
|
dict.io("IO_RESET")
|
|
|
|
-- //TODO check if can detect a cart inserted backwards before continuing
|
|
|
|
-- //check if NES/Famicom cart
|
|
dict.io("NES_INIT")
|
|
|
|
-- //if PPU /A13 is tied to CIRAM /CE we know it's NES/Famicom
|
|
if nes.jumper_ciramce_ppuA13n(debug) then
|
|
-- //NES with 2 screen mirroring
|
|
if debug then print("CIRAM /CE is jumpered to PPU /A13") end
|
|
cart_console = "NES"
|
|
elseif nes.ciramce_inv_ppuA13(debug) then
|
|
-- //some boards including INLXO-ROM boards drive CIRAM /CE with inverse of PPU A13
|
|
if debug then print("CIRAM /CE is inverse of PPU A13") end
|
|
cart_console = "NES"
|
|
end
|
|
-- TODO check if CIRAM on cartridge or NT CHR-ROM
|
|
--
|
|
-- if NES/FC determine which if possible
|
|
-- also possible that this could catch failed detections above which is current case with VRC6
|
|
-- Famicom has audio in and audio out pins connected to each other
|
|
-- For this to pass with a NES cart EXP6 would have to be jumpered to EXP0 for some strange reason
|
|
-- might fail if expansion audio mixing circuitry foils the check above
|
|
-- but worst case we detected NES when famicom which isn't big deal..
|
|
if nes.jumper_famicom_sound(debug) then
|
|
if debug then print("Famicom audio jumper found") end
|
|
cart_console = "Famicom"
|
|
end
|
|
|
|
-- //if couldn't detect NES/FC check for SNES cartridge
|
|
-- //want to keep from outputting on EXP bus if NES cart was found
|
|
-- if ( cart->console == UNKNOWN ) {
|
|
-- //only way I can think of is if memory is enabled by certain addresses and control signals
|
|
-- snes_init( transfer );
|
|
-- if ( snes_mem_visible( transfer, 0x00, 0xFFFC )) {
|
|
-- //CHECK for memory visible near NES reset vector
|
|
-- debug("SNES memories detected");
|
|
-- cart->console = SNES_CART;
|
|
-- }
|
|
-- //now it's possible that rom is there, but data is 0xFF so above test would fail
|
|
-- //one option would be to drive bus low for short period and see if bus can be
|
|
-- //driven low. This could damage pin drivers though, best to create command in
|
|
-- //firmware to perform this to limit to one CPU cycle instead of USB xfr times
|
|
--
|
|
-- //Prob best to check if able to read flash ID's if reset vector data is 0xFF
|
|
-- //Since reset vector being 0xFF prob means it's blank flash cart..
|
|
--
|
|
-- //playable SNES carts should have data somewhere in reset vector...
|
|
-- }
|
|
--
|
|
-- //always end with resetting i/o
|
|
dict.io("IO_RESET")
|
|
|
|
if cart_console then
|
|
print(cart_console, "cartridge detected!")
|
|
return true
|
|
else
|
|
print("unable to detect cartridge type")
|
|
return false
|
|
end
|
|
-- 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.");
|
|
-- }
|
|
--}
|
|
|
|
end
|
|
|
|
|
|
|
|
-- call functions desired to run when script is called/imported
|
|
|
|
|
|
-- functions other modules are able to call
|
|
cart.detect_console = detect_console
|
|
|
|
-- return the module's table
|
|
return cart
|