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midi_input.c
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midi_input.c
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/*
Copyright (C) 2024 Eugene Chernyh (mrf-r)
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:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
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 "midi_input.h"
#include "midi_internals.h"
// unsigned power of 2 only!
#ifndef MIDI_RX_BUFFER_SIZE
#define MIDI_RX_BUFFER_SIZE (256)
#endif
#ifndef MIDI_RX_SYSEX_BUFFER_SIZE
#define MIDI_RX_SYSEX_BUFFER_SIZE (256)
#endif
// main buffer input - can also be called from isr
static volatile MidiTsMessageT m_buffer[MIDI_RX_BUFFER_SIZE];
static volatile uint16_t m_wp;
static volatile uint16_t m_rp;
static volatile MidiMessageT m_sysex_buffer[MIDI_RX_SYSEX_BUFFER_SIZE];
static volatile uint16_t m_sysex_wp;
static volatile uint16_t m_sysex_rp;
static volatile uint8_t m_sysex_cn;
// 0x0 1, 2 or 3 Miscellaneous function codes. Reserved for future extensions.
// 0x1 1, 2 or 3 Cable events. Reserved for future expansion.
// 0x2 2 Two-byte System Common messages like MTC, SongSelect, etc.
// 0x3 3 Three-byte System Common messages like SPP, etc.
// 0x4 3 SysEx starts or continues
// 0x5 1 Single-byte System Common Message or SysEx ends with following single byte.
// 0x6 2 SysEx ends with following two bytes.
// 0x7 3 SysEx ends with following three bytes.
// 0x8 3 Note-off
// 0x9 3 Note-on
// 0xA 3 Poly-KeyPress
// 0xB 3 Control Change
// 0xC 2 Program Change
// 0xD 2 Channel Pressure
// 0xE 3 PitchBend Change
// 0xF 1 Single Byte
uint16_t midiUtilisationGet()
{
return (m_wp - m_rp) & (MIDI_RX_BUFFER_SIZE - 1);
}
uint16_t midiSysexUtilisationGet()
{
return (m_sysex_wp - m_sysex_rp) & (MIDI_RX_SYSEX_BUFFER_SIZE - 1);
}
static inline MidiRet mBufWrite(MidiTsMessageT m)
{
uint16_t wp = (m_wp + 1) & (MIDI_RX_BUFFER_SIZE - 1);
if (wp != m_rp) {
m_buffer[m_wp] = m;
m_wp = wp;
return MIDI_RET_OK;
} else {
return MIDI_RET_FAIL;
}
}
static inline MidiRet mSysexWrite(MidiMessageT m)
{
uint16_t wp = (m_sysex_wp + 1) & (MIDI_RX_SYSEX_BUFFER_SIZE - 1);
if (wp != m_sysex_rp) {
m_sysex_buffer[m_sysex_wp] = m;
m_sysex_wp = wp;
const uint16_t t_syxe = CINBMP_SYSEXEND1 | CINBMP_SYSEXEND2 | CINBMP_SYSEXEND3;
if ((t_syxe >> m.cin) & 1) {
m_sysex_cn = SYSEX_CN_UNLOCK;
}
return MIDI_RET_OK;
} else {
return MIDI_RET_FAIL;
}
}
static inline MidiRet mSysexLock(uint8_t cn)
{
if ((m_sysex_cn == SYSEX_CN_UNLOCK) || (m_sysex_cn == cn)) {
m_sysex_cn = cn;
return MIDI_RET_OK;
}
return MIDI_RET_FAIL;
}
void midiFlush()
{
MIDI_ATOMIC_START();
m_rp = 0;
m_wp = 0;
MIDI_ATOMIC_END();
}
void midiSysexFlush()
{
MIDI_ATOMIC_START();
m_sysex_rp = 0;
m_sysex_wp = 0;
m_sysex_cn = SYSEX_CN_UNLOCK;
MIDI_ATOMIC_END();
}
void midiInit()
{
midiFlush();
midiSysexFlush();
}
MidiRet midiRead(MidiTsMessageT* m)
{
MidiRet ret = MIDI_RET_FAIL;
MIDI_ATOMIC_START();
if (m_rp != m_wp) {
*m = m_buffer[m_rp];
m_rp = (m_rp + 1) & (MIDI_RX_BUFFER_SIZE - 1);
ret = MIDI_RET_OK;
}
MIDI_ATOMIC_END();
return ret;
}
MidiRet midiSysexRead(MidiMessageT* m)
{
MidiRet ret = MIDI_RET_FAIL;
MIDI_ATOMIC_START();
if (m_sysex_rp != m_sysex_wp) {
*m = m_sysex_buffer[m_sysex_rp];
m_sysex_rp = (m_sysex_rp + 1) & (MIDI_RX_SYSEX_BUFFER_SIZE - 1);
ret = MIDI_RET_OK;
}
MIDI_ATOMIC_END();
return ret;
}
MidiRet midiTsWrite(MidiMessageT m, uint32_t timestamp)
{
MidiRet ret = MIDI_RET_OK;
const uint16_t t_syxs = CINBMP_SYSEX3BYTES | CINBMP_SYSEXEND1 | CINBMP_SYSEXEND2 | CINBMP_SYSEXEND3;
MIDI_ATOMIC_START();
if ((t_syxs >> m.cin) & 1) {
// sysex start
if (MIDI_RET_OK == mSysexLock(m.cn)) {
ret = mSysexWrite(m);
} else {
ret = MIDI_RET_FAIL;
}
(void)timestamp;
} else {
// convert zero velocity noteon to noteoff
if ((m.full_word & 0xFF00F00F) == 0x00009009) {
m.full_word &= 0xFFFFEFFE;
}
MidiTsMessageT mrx;
mrx.mes = m;
mrx.timestamp = timestamp;
ret = mBufWrite(mrx);
}
MIDI_ATOMIC_END();
return ret;
}
MidiRet midiWrite(MidiMessageT m)
{
return midiTsWrite(m, MIDI_GET_CLOCK());
}
// simplified write for internal use
MidiRet midiNonSysexWrite(MidiMessageT m)
{
MidiRet ret = MIDI_RET_FAIL;
MidiTsMessageT mrx;
mrx.mes = m;
MIDI_ATOMIC_START();
mrx.timestamp = MIDI_GET_CLOCK();
ret = mBufWrite(mrx);
MIDI_ATOMIC_END();
return ret;
}
#if (MIDI_RX_BUFFER_SIZE & (MIDI_RX_BUFFER_SIZE - 1)) != 0
#error "input buffer: please, use only power of 2"
#endif
#if (MIDI_RX_SYSEX_BUFFER_SIZE & (MIDI_RX_SYSEX_BUFFER_SIZE - 1)) != 0
#error "input sysex buffer: please, use only power of 2"
#endif