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@@ -1,20 +1,44 @@
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-// insert cool lengthy disclaimer here
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+/* sd2snes - SD card based universal cartridge for the SNES
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+ Copyright (C) 2009-2010 Maximilian Rehkopf <otakon@gmx.net>
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+ AVR firmware portion
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+
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+ Inspired by and based on code from sd2iec, written by Ingo Korb et al.
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+ See sdcard.c|h, config.h.
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+
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+ FAT file system access based on code by ChaN, Jim Brain, Ingo Korb,
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+ see ff.c|h.
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+
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+ This program is free software; you can redistribute it and/or modify
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+ it under the terms of the GNU General Public License as published by
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+ the Free Software Foundation; version 2 of the License only.
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+
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+ This program is distributed in the hope that it will be useful,
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+ but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+ GNU General Public License for more details.
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+
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+ You should have received a copy of the GNU General Public License
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+ along with this program; if not, write to the Free Software
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+ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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+
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+ fpga_spi.h: functions for SPI ctrl, SRAM interfacing and feature configuration
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+*/
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/*
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- fpga_spi.c: SPI functions for SRAM interfacing and mapper config
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SPI commands
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- cmd param function
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+ cmd param function
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=============================================
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- 00 bb[hh[ll]] set address to 0xbb0000, 0xbbhh00, or 0xbbhhll
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- 10 bbhhll set SNES input address mask to 0xbbhhll
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- 2s bbhhll set SRAM address mask for chip #s to 0xbbhhll
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- 3m - set mapper to m
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- 0=HiROM, 1=LoROM
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- 80 - read with increment
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- 81 - read w/o increment
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- 90 {xx}* write xx with increment
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- 91 {xx}* write xx w/o increment
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+ 00 bb[hh[ll]] set address to 0xbb0000, 0xbbhh00, or 0xbbhhll
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+ 10 bbhhll set SNES input address mask to 0xbbhhll
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+ 20 bbhhll set SRAM address mask to 0xbbhhll
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+ 3m - set mapper to m
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+ 0=HiROM, 1=LoROM, 2=ExHiROM, 7=Menu
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+ 80 - read with increment
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+ 81 - read w/o increment
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+ 90 {xx}* write xx with increment
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+ 91 {xx}* write xx w/o increment
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+ F0 - receive test token (to see if FPGA is alive)
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*/
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