diff options
Diffstat (limited to 'quantum/api')
| -rw-r--r-- | quantum/api/api_sysex.c | 72 | ||||
| -rw-r--r-- | quantum/api/api_sysex.h | 26 |
2 files changed, 98 insertions, 0 deletions
diff --git a/quantum/api/api_sysex.c b/quantum/api/api_sysex.c new file mode 100644 index 000000000..6a2ee9012 --- /dev/null +++ b/quantum/api/api_sysex.c @@ -0,0 +1,72 @@ +/* Copyright 2016 Jack Humbert, Fred Sundvik + * + * This program is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ +#include "api_sysex.h" +#include "sysex_tools.h" +#include "print.h" + +void send_bytes_sysex(uint8_t message_type, uint8_t data_type, uint8_t * bytes, uint16_t length) { + // SEND_STRING("\nTX: "); + // for (uint8_t i = 0; i < length; i++) { + // send_byte(bytes[i]); + // SEND_STRING(" "); + // } + if (length > API_SYSEX_MAX_SIZE) { + xprintf("Sysex msg too big %d %d %d", message_type, data_type, length); + return; + } + + + // The buffer size required is calculated as the following + // API_SYSEX_MAX_SIZE is the maximum length + // In addition to that we have a two byte message header consisting of the message_type and data_type + // This has to be encoded with an additional overhead of one byte for every starting 7 bytes + // We just add one extra byte in case it's not divisible by 7 + // Then we have an unencoded header consisting of 4 bytes + // Plus a one byte terminator + const unsigned message_header = 2; + const unsigned unencoded_message = API_SYSEX_MAX_SIZE + message_header; + const unsigned encoding_overhead = unencoded_message / 7 + 1; + const unsigned encoded_size = unencoded_message + encoding_overhead; + const unsigned unencoded_header = 4; + const unsigned terminator = 1; + const unsigned buffer_size = encoded_size + unencoded_header + terminator; + uint8_t buffer[encoded_size + unencoded_header + terminator]; + // The unencoded header + buffer[0] = 0xF0; + buffer[1] = 0x00; + buffer[2] = 0x00; + buffer[3] = 0x00; + + // We copy the message to the end of the array, this way we can do an inplace encoding, using the same + // buffer for both input and output + const unsigned message_size = length + message_header; + uint8_t* unencoded_start = buffer + buffer_size - message_size; + uint8_t* ptr = unencoded_start; + *(ptr++) = message_type; + *(ptr++) = data_type; + memcpy(ptr, bytes, length); + + unsigned encoded_length = sysex_encode(buffer + unencoded_header, unencoded_start, message_size); + unsigned final_size = unencoded_header + encoded_length + terminator; + buffer[final_size - 1] = 0xF7; + midi_send_array(&midi_device, final_size, buffer); + + // SEND_STRING("\nTD: "); + // for (uint8_t i = 0; i < encoded_length + 5; i++) { + // send_byte(buffer[i]); + // SEND_STRING(" "); + // } +} diff --git a/quantum/api/api_sysex.h b/quantum/api/api_sysex.h new file mode 100644 index 000000000..a23f00f57 --- /dev/null +++ b/quantum/api/api_sysex.h @@ -0,0 +1,26 @@ +/* Copyright 2016 Jack Humbert + * + * This program is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ + +#ifndef _API_SYSEX_H_ +#define _API_SYSEX_H_ + +#include "api.h" + +void send_bytes_sysex(uint8_t message_type, uint8_t data_type, uint8_t * bytes, uint16_t length); + +#define SEND_BYTES(mt, dt, b, l) send_bytes_sysex(mt, dt, b, l) + +#endif |