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121 lines
3.1 KiB
121 lines
3.1 KiB
/*
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MicroDexed
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MicroDexed is a port of the Dexed sound engine
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(https://github.com/asb2m10/dexed) for the Teensy-3.5/3.6 with audio shield
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(c)2018 H. Wirtz <wirtz@parasitstudio.de>
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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; either version 3 of the License, or
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(at your option) any later version.
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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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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 Foundation,
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Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <Arduino.h>
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#include <Wire.h>
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#include <SPI.h>
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#include <SD.h>
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#include "dexed.h"
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#include "dexed_sysex.h"
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#include "config.h"
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void load_sysex(char *name, uint8_t voice_number)
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{
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File root;
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if (sd_card_available)
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{
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root = SD.open("/");
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while (42 == 42)
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{
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File entry = root.openNextFile();
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if (!entry)
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break;
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else
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{
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if (!entry.isDirectory())
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{
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if (strcmp(name, entry.name()) == 0)
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{
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uint8_t data[128];
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Serial.println(entry.name());
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if (get_sysex_voice(entry, voice_number, data))
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dexed->loadSysexVoice(data);
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else
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Serial.println(F("Cannot load voice data"));
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entry.close();
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break;
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}
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entry.close();
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}
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}
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}
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}
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}
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bool get_sysex_voice(File sysex, uint8_t voice_number, uint8_t* data)
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{
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File file;
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uint16_t i,n;
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uint32_t calc_checksum = 0;
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if (sysex.size() != 4104) // check sysex size
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return (false);
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if (file = SD.open(sysex.name()))
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{
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if (file.read() != 0xf0) // check sysex start-byte
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{
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Serial.println(F("E: SysEx start byte not found."));
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return (false);
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}
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if (file.read() != 0x43) // check sysex vendor is Yamaha
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{
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Serial.println(F("E: SysEx vendor not Yamaha."));
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return (false);
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}
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file.seek(4103);
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if (file.read() != 0xf7) // check sysex end-byte
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{
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Serial.println(F("E: SysEx end byte not found."));
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return (false);
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}
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file.seek(3);
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if (file.read() != 0x09) // check for sysex type (0x09=32 voices)
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{
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Serial.println(F("E: SysEx type not 32 voices."));
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return (false);
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}
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file.seek(6); // start of 32*128 (=4096) bytes data
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for (i = 0; i < 32; i++)
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{
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for (n = 0; n < 128; n++)
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{
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uint8_t d = file.read();
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if (i == voice_number)
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{
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data[n] = d;
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}
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calc_checksum += (d & 0x7F); // calculate checksum
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}
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}
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calc_checksum = uint8_t(~calc_checksum + 1);
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if (calc_checksum != uint8_t(file.read()))
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{
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Serial.println(F("E: checksum mismatch."));
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return (false);
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}
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}
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return (true);
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}
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