franta-hg@1: /**
franta-hg@1:  * SysEx message encoder for Roland MT-32
franta-hg@1:  * Copyright © 2020 František Kučera (Frantovo.cz, GlobalCode.info)
franta-hg@1:  *
franta-hg@1:  * This program is free software: you can redistribute it and/or modify
franta-hg@1:  * it under the terms of the GNU General Public License as published by
franta-hg@1:  * the Free Software Foundation, version 3 of the License.
franta-hg@1:  *
franta-hg@1:  * This program is distributed in the hope that it will be useful,
franta-hg@1:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
franta-hg@1:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
franta-hg@1:  * GNU General Public License for more details.
franta-hg@1:  *
franta-hg@1:  * You should have received a copy of the GNU General Public License
franta-hg@1:  * along with this program. If not, see <http://www.gnu.org/licenses/>.
franta-hg@1:  */
franta-hg@0: #include <iostream>
franta-hg@0: #include <iomanip>
franta-hg@0: 
franta-hg@0: /**
franta-hg@0:  * Translates text from standard input to a hex-formatted System Exclusive (SysEx) message for Roland MT-32,
franta-hg@0:  * which instructs the unit to show given text on the display.
franta-hg@0:  * 
franta-hg@0:  * Roland MT-32 is capable to display 20 characters.
franta-hg@0:  * Longer messages are silently truncated by the MT-32 unit (this software does not check the length).
franta-hg@0:  * 
franta-hg@0:  * The SysEx message contains a checksum.
franta-hg@0:  * If the checksum is wrong, the MT-32 unit shows the "Exc. Checksum error" message for few seconds
franta-hg@0:  * and then returns back to the default screen.
franta-hg@0:  * 
franta-hg@2:  * Only printable ASCII characters are supported. Other characters (bytes) are replaced by "."
franta-hg@2:  * 
franta-hg@2:  * Some characters are displayed differently:
franta-hg@2:  *   ASCII   MT-32
franta-hg@2:  *       ~   →
franta-hg@2:  *       \   ¥
franta-hg@2:  * 
franta-hg@2:  * Usage examples:
franta-hg@0:  *     amidi --port="hw:2,0,0" --send-hex="$(echo -n '   Run GNU/Linux    ' | ./mt-32-display )"
franta-hg@2:  *     while read message; do amidi --port="hw:2,0,0" --send-hex="$(echo -n "$message" | ./mt-32-display )"; done
franta-hg@0:  * 
franta-hg@0:  * @param argc
franta-hg@0:  * @param argv
franta-hg@0:  * @return 
franta-hg@0:  */
franta-hg@0: int main(int argc, char**argv) {
franta-hg@0: 	std::cout << "f0 41 10 16 12 20 00 00 ";
franta-hg@0: 	std::cout << std::hex << std::setfill('0');
franta-hg@0: 
franta-hg@0: 	int sum = 0;
franta-hg@0: 
franta-hg@0: 	// 20 00 00 = display message
franta-hg@0: 	sum += 0x20;
franta-hg@0: 	sum += 0x00;
franta-hg@0: 	sum += 0x00;
franta-hg@0: 
franta-hg@0: 	for (char ch; std::cin.read(&ch, 1).good();) {
franta-hg@2: 		if (ch < 32 || ch > 126) ch = '.';
franta-hg@0: 		std::cout << std::setw(2) << ((int) ch) << " ";
franta-hg@0: 		sum += ch;
franta-hg@0: 	}
franta-hg@0: 
franta-hg@0: 	sum %= 128;
franta-hg@0: 	sum = 128 - sum;
franta-hg@0: 	std::cout << std::setw(2) << sum;
franta-hg@0: 	std::cout << " f7";
franta-hg@0: 
franta-hg@0: 	std::cout << std::endl;
franta-hg@0: 	return 0;
franta-hg@0: }