72 lines
3.1 KiB
C
72 lines
3.1 KiB
C
/* Copyright 2016 Jack Humbert, Fred Sundvik
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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, either version 2 of the License, or
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* (at your option) any later version.
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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, see <http://www.gnu.org/licenses/>.
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*/
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#include "api_sysex.h"
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#include "sysex_tools.h"
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#include "print.h"
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#include "qmk_midi.h"
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void send_bytes_sysex(uint8_t message_type, uint8_t data_type, uint8_t* bytes, uint16_t length) {
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// SEND_STRING("\nTX: ");
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// for (uint8_t i = 0; i < length; i++) {
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// send_byte(bytes[i]);
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// SEND_STRING(" ");
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// }
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if (length > API_SYSEX_MAX_SIZE) {
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xprintf("Sysex msg too big %d %d %d", message_type, data_type, length);
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return;
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}
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// The buffer size required is calculated as the following
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// API_SYSEX_MAX_SIZE is the maximum length
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// In addition to that we have a two byte message header consisting of the message_type and data_type
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// This has to be encoded with an additional overhead of one byte for every starting 7 bytes
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// We just add one extra byte in case it's not divisible by 7
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// Then we have an unencoded header consisting of 4 bytes
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// Plus a one byte terminator
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const unsigned message_header = 2;
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const unsigned unencoded_message = API_SYSEX_MAX_SIZE + message_header;
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const unsigned encoding_overhead = unencoded_message / 7 + 1;
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const unsigned encoded_size = unencoded_message + encoding_overhead;
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const unsigned unencoded_header = 4;
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const unsigned terminator = 1;
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const unsigned buffer_size = encoded_size + unencoded_header + terminator;
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uint8_t buffer[encoded_size + unencoded_header + terminator];
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// The unencoded header
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buffer[0] = 0xF0;
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buffer[1] = 0x00;
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buffer[2] = 0x00;
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buffer[3] = 0x00;
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// We copy the message to the end of the array, this way we can do an inplace encoding, using the same
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// buffer for both input and output
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const unsigned message_size = length + message_header;
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uint8_t* unencoded_start = buffer + buffer_size - message_size;
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uint8_t* ptr = unencoded_start;
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*(ptr++) = message_type;
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*(ptr++) = data_type;
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memcpy(ptr, bytes, length);
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unsigned encoded_length = sysex_encode(buffer + unencoded_header, unencoded_start, message_size);
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unsigned final_size = unencoded_header + encoded_length + terminator;
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buffer[final_size - 1] = 0xF7;
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midi_send_array(&midi_device, final_size, buffer);
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// SEND_STRING("\nTD: ");
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// for (uint8_t i = 0; i < encoded_length + 5; i++) {
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// send_byte(buffer[i]);
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// SEND_STRING(" ");
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// }
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}
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