1 /* Copyright 2016 Jack Humbert, Fred Sundvik
3 * This program is free software: you can redistribute it and/or modify
4 * it under the terms of the GNU General Public License as published by
5 * the Free Software Foundation, either version 2 of the License, or
6 * (at your option) any later version.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
13 * You should have received a copy of the GNU General Public License
14 * along with this program. If not, see <http://www.gnu.org/licenses/>.
16 #include "api_sysex.h"
17 #include "sysex_tools.h"
20 void send_bytes_sysex(uint8_t message_type, uint8_t data_type, uint8_t * bytes, uint16_t length) {
21 // SEND_STRING("\nTX: ");
22 // for (uint8_t i = 0; i < length; i++) {
23 // send_byte(bytes[i]);
26 if (length > API_SYSEX_MAX_SIZE) {
27 xprintf("Sysex msg too big %d %d %d", message_type, data_type, length);
32 // The buffer size required is calculated as the following
33 // API_SYSEX_MAX_SIZE is the maximum length
34 // In addition to that we have a two byte message header consisting of the message_type and data_type
35 // This has to be encoded with an additional overhead of one byte for every starting 7 bytes
36 // We just add one extra byte in case it's not divisible by 7
37 // Then we have an unencoded header consisting of 4 bytes
38 // Plus a one byte terminator
39 const unsigned message_header = 2;
40 const unsigned unencoded_message = API_SYSEX_MAX_SIZE + message_header;
41 const unsigned encoding_overhead = unencoded_message / 7 + 1;
42 const unsigned encoded_size = unencoded_message + encoding_overhead;
43 const unsigned unencoded_header = 4;
44 const unsigned terminator = 1;
45 const unsigned buffer_size = encoded_size + unencoded_header + terminator;
46 uint8_t buffer[encoded_size + unencoded_header + terminator];
47 // The unencoded header
53 // We copy the message to the end of the array, this way we can do an inplace encoding, using the same
54 // buffer for both input and output
55 const unsigned message_size = length + message_header;
56 uint8_t* unencoded_start = buffer + buffer_size - message_size;
57 uint8_t* ptr = unencoded_start;
58 *(ptr++) = message_type;
60 memcpy(ptr, bytes, length);
62 unsigned encoded_length = sysex_encode(buffer + unencoded_header, unencoded_start, message_size);
63 unsigned final_size = unencoded_header + encoded_length + terminator;
64 buffer[final_size - 1] = 0xF7;
65 midi_send_array(&midi_device, final_size, buffer);
67 // SEND_STRING("\nTD: ");
68 // for (uint8_t i = 0; i < encoded_length + 5; i++) {
69 // send_byte(buffer[i]);