1 #include <iostream>

     2 #include <iomanip>

     3 

     4 /**

     5  * Translates text from standard input to a hex-formatted System Exclusive (SysEx) message for Roland MT-32,

     6  * which instructs the unit to show given text on the display.

     7  * 

     8  * Roland MT-32 is capable to display 20 characters.

     9  * Longer messages are silently truncated by the MT-32 unit (this software does not check the length).

    10  * 

    11  * The SysEx message contains a checksum.

    12  * If the checksum is wrong, the MT-32 unit shows the "Exc. Checksum error" message for few seconds

    13  * and then returns back to the default screen.

    14  * 

    15  * Usage:

    16  *     amidi --port="hw:2,0,0" --send-hex="$(echo -n '   Run GNU/Linux    ' | ./mt-32-display )"

    17  * 

    18  * @param argc

    19  * @param argv

    20  * @return 

    21  */

    22 int main(int argc, char**argv) {

    23 	std::cout << "f0 41 10 16 12 20 00 00 ";

    24 	std::cout << std::hex << std::setfill('0');

    25 

    26 	int sum = 0;

    27 

    28 	// 20 00 00 = display message

    29 	sum += 0x20;

    30 	sum += 0x00;

    31 	sum += 0x00;

    32 

    33 	for (char ch; std::cin.read(&ch, 1).good();) {

    34 		std::cout << std::setw(2) << ((int) ch) << " ";

    35 		sum += ch;

    36 	}

    37 

    38 	sum %= 128;

    39 	sum = 128 - sum;

    40 	std::cout << std::setw(2) << sum;

    41 	std::cout << " f7";

    42 

    43 	std::cout << std::endl;

    44 	return 0;

    45 }