/* Teensyduino Core Library
* http://www.pjrc.com/teensy/
* Copyright (c) 2013 PJRC.COM, LLC.
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* 1. The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* 2. If the Software is incorporated into a build system that allows
* selection among a list of target devices, then similar target
* devices manufactured by PJRC.COM must be included in the list of
* target devices and selectable in the same manner.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include "usb_dev.h"
#include "usb_midi.h"
#include "core_pins.h" // for yield()
#include "HardwareSerial.h"
#ifdef MIDI_INTERFACE // defined by usb_dev.h -> usb_desc.h
uint8_t usb_midi_msg_channel;
uint8_t usb_midi_msg_type;
uint8_t usb_midi_msg_data1;
uint8_t usb_midi_msg_data2;
uint8_t usb_midi_msg_sysex[USB_MIDI_SYSEX_MAX];
uint8_t usb_midi_msg_sysex_len;
void (*usb_midi_handleNoteOff)(uint8_t ch, uint8_t note, uint8_t vel) = NULL;
void (*usb_midi_handleNoteOn)(uint8_t ch, uint8_t note, uint8_t vel) = NULL;
void (*usb_midi_handleVelocityChange)(uint8_t ch, uint8_t note, uint8_t vel) = NULL;
void (*usb_midi_handleControlChange)(uint8_t ch, uint8_t control, uint8_t value) = NULL;
void (*usb_midi_handleProgramChange)(uint8_t ch, uint8_t program) = NULL;
void (*usb_midi_handleAfterTouch)(uint8_t ch, uint8_t pressure) = NULL;
void (*usb_midi_handlePitchChange)(uint8_t ch, int pitch) = NULL;
void (*usb_midi_handleSysEx)(const uint8_t *data, uint16_t length, uint8_t complete) = NULL;
void (*usb_midi_handleRealTimeSystem)(uint8_t rtb) = NULL;
// Maximum number of transmit packets to queue so we don't starve other endpoints for memory
#define TX_PACKET_LIMIT 6
static usb_packet_t *rx_packet=NULL;
static usb_packet_t *tx_packet=NULL;
static uint8_t transmit_previous_timeout=0;
static uint8_t tx_noautoflush=0;
// When the PC isn't listening, how long do we wait before discarding data?
#define TX_TIMEOUT_MSEC 40
#if F_CPU == 168000000
#define TX_TIMEOUT (TX_TIMEOUT_MSEC * 1100)
#elif F_CPU == 144000000
#define TX_TIMEOUT (TX_TIMEOUT_MSEC * 932)
#elif F_CPU == 120000000
#define TX_TIMEOUT (TX_TIMEOUT_MSEC * 764)
#elif F_CPU == 96000000
#define TX_TIMEOUT (TX_TIMEOUT_MSEC * 596)
#elif F_CPU == 72000000
#define TX_TIMEOUT (TX_TIMEOUT_MSEC * 512)
#elif F_CPU == 48000000
#define TX_TIMEOUT (TX_TIMEOUT_MSEC * 428)
#elif F_CPU == 24000000
#define TX_TIMEOUT (TX_TIMEOUT_MSEC * 262)
#endif
void usb_midi_write_packed(uint32_t n)
{
uint32_t index, wait_count=0;
tx_noautoflush = 1;
if (!tx_packet) {
while (1) {
if (!usb_configuration) {
//serial_print("error1\n");
return;
}
if (usb_tx_packet_count(MIDI_TX_ENDPOINT) < TX_PACKET_LIMIT) {
tx_packet = usb_malloc();
if (tx_packet) break;
}
if (++wait_count > TX_TIMEOUT || transmit_previous_timeout) {
transmit_previous_timeout = 1;
//serial_print("error2\n");
return;
}
yield();
}
}
transmit_previous_timeout = 0;
index = tx_packet->index;
*((uint32_t *)(tx_packet->buf) + index++) = n;
if (index < MIDI_TX_SIZE/4) {
tx_packet->index = index;
} else {
tx_packet->len = MIDI_TX_SIZE;
usb_tx(MIDI_TX_ENDPOINT, tx_packet);
tx_packet = usb_malloc();
}
tx_noautoflush = 0;
}
void usb_midi_send_sysex(const uint8_t *data, uint32_t length)
{
// TODO: MIDI 2.5 lib automatically adds start and stop bytes
while (length > 3) {
usb_midi_write_packed(0x04 | (data[0] << 8) | (data[1] << 16) | (data[2] << 24));
data += 3;
length -= 3;
}
if (length == 3) {
usb_midi_write_packed(0x07 | (data[0] << 8) | (data[1] << 16) | (data[2] << 24));
} else if (length == 2) {
usb_midi_write_packed(0x06 | (data[0] << 8) | (data[1] << 16));
} else if (length == 1) {
usb_midi_write_packed(0x05 | (data[0] << 8));
}
}
void usb_midi_flush_output(void)
{
if (tx_noautoflush == 0 && tx_packet && tx_packet->index > 0) {
tx_packet->len = tx_packet->index * 4;
usb_tx(MIDI_TX_ENDPOINT, tx_packet);
tx_packet = usb_malloc();
}
}
void static sysex_byte(uint8_t b)
{
// when buffer is full, send another chunk to handler.
if (usb_midi_msg_sysex_len == USB_MIDI_SYSEX_MAX) {
if (usb_midi_handleSysEx) {
(*usb_midi_handleSysEx)(usb_midi_msg_sysex, usb_midi_msg_sysex_len, 0);
usb_midi_msg_sysex_len = 0;
}
}
if (usb_midi_msg_sysex_len < USB_MIDI_SYSEX_MAX) {
usb_midi_msg_sysex[usb_midi_msg_sysex_len++] = b;
}
}
int usb_midi_read(uint32_t channel)
{
uint32_t n, index, ch, type1, type2;
if (!rx_packet) {
if (!usb_configuration) return 0;
rx_packet = usb_rx(MIDI_RX_ENDPOINT);
if (!rx_packet) return 0;
if (rx_packet->len == 0) {
usb_free(rx_packet);
rx_packet = NULL;
return 0;
}
}
index = rx_packet->index;
n = *(uint32_t *)(rx_packet->buf + index);
//serial_print("midi rx, n=");
//serial_phex32(n);
//serial_print("\n");
index += 4;
if (index < rx_packet->len) {
rx_packet->index = index;
} else {
usb_free(rx_packet);
rx_packet = usb_rx(MIDI_RX_ENDPOINT);
}
type1 = n & 15;
type2 = (n >> 12) & 15;
ch = ((n >> 8) & 15) + 1;
if (type1 >= 0x08 && type1 <= 0x0E) {
if (channel && channel != ch) {
// ignore other channels when user wants single channel read
return 0;
}
if (type1 == 0x08 && type2 == 0x08) {
usb_midi_msg_type = 0; // 0 = Note off
if (usb_midi_handleNoteOff)
(*usb_midi_handleNoteOff)(ch, (n >> 16), (n >> 24));
} else
if (type1 == 0x09 && type2 == 0x09) {
if ((n >> 24) > 0) {
usb_midi_msg_type = 1; // 1 = Note on
if (usb_midi_handleNoteOn)
(*usb_midi_handleNoteOn)(ch, (n >> 16), (n >> 24));
} else {
usb_midi_msg_type = 0; // 0 = Note off
if (usb_midi_handleNoteOff)
(*usb_midi_handleNoteOff)(ch, (n >> 16), (n >> 24));
}
} else
if (type1 == 0x0A && type2 == 0x0A) {
usb_midi_msg_type = 2; // 2 = Poly Pressure
if (usb_midi_handleVelocityChange)
(*usb_midi_handleVelocityChange)(ch, (n >> 16), (n >> 24));
} else
if (type1 == 0x0B && type2 == 0x0B) {
usb_midi_msg_type = 3; // 3 = Control Change
if (usb_midi_handleControlChange)
(*usb_midi_handleControlChange)(ch, (n >> 16), (n >> 24));
} else
if (type1 == 0x0C && type2 == 0x0C) {
usb_midi_msg_type = 4; // 4 = Program Change
if (usb_midi_handleProgramChange)
(*usb_midi_handleProgramChange)(ch, (n >> 16));
} else
if (type1 == 0x0D && type2 == 0x0D) {
usb_midi_msg_type = 5; // 5 = After Touch
if (usb_midi_handleAfterTouch)
(*usb_midi_handleAfterTouch)(ch, (n >> 16));
} else
if (type1 == 0x0E && type2 == 0x0E) {
usb_midi_msg_type = 6; // 6 = Pitch Bend
if (usb_midi_handlePitchChange)
(*usb_midi_handlePitchChange)(ch,
((n >> 16) & 0x7F) | ((n >> 17) & 0x3F80));
} else {
return 0;
}
return_message:
usb_midi_msg_channel = ch;
usb_midi_msg_data1 = (n >> 16);
usb_midi_msg_data2 = (n >> 24);
return 1;
}
if (type1 == 0x04) {
sysex_byte(n >> 8);
sysex_byte(n >> 16);
sysex_byte(n >> 24);
return 0;
}
if (type1 >= 0x05 && type1 <= 0x07) {
sysex_byte(n >> 8);
if (type1 >= 0x06) sysex_byte(n >> 16);
if (type1 == 0x07) sysex_byte(n >> 24);
usb_midi_msg_data1 = usb_midi_msg_sysex_len;
usb_midi_msg_sysex_len = 0;
usb_midi_msg_type = 7; // 7 = Sys Ex
if (usb_midi_handleSysEx)
(*usb_midi_handleSysEx)(usb_midi_msg_sysex, usb_midi_msg_data1, 1);
return 1;
}
if (type1 == 0x0F) {
// TODO: does this need to be a full MIDI parser?
// What software actually uses this message type in practice?
if (usb_midi_msg_sysex_len > 0) {
// From David Sorlien, dsorlien at gmail.com, http://axe4live.wordpress.com
// OSX sometimes uses Single Byte Unparsed to
// send bytes in the middle of a SYSEX message.
sysex_byte(n >> 8);
} else {
// From Sebastian Tomczak, seb.tomczak at gmail.com
// http://little-scale.blogspot.com/2011/08/usb-midi-game-boy-sync-for-16.html
usb_midi_msg_type = 8;
if (usb_midi_handleRealTimeSystem)
(*usb_midi_handleRealTimeSystem)(n >> 8);
goto return_message;
}
}
return 0;
}
#endif // MIDI_INTERFACE