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This way the device can act as a MIDI hub between the UART and the USB-C side, or just let packets flow through the UART when they weren't for the pedal. To be useful in MIDI Thru mode, you probably should set the MIDI channel explicitly. Otherwise the pedal acts in "Omni" mode and reacts to all channels. Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
63 lines
1.6 KiB
C
63 lines
1.6 KiB
C
//
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// MIDI connection code
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//
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// MIDI Control Change (CC) constants
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#define MIDI_CC_POT_START 10 // CC 10-19 map to pots 0-9
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#define MIDI_CC_GLOBAL_ENABLE 20
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#define MIDI_CC_EFFECT_ENABLE 21
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#define MIDI_CC_ACTIVE_POT 22
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#define MIDI_CC_EFFECT_INTENSE 30
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#define MIDI_CC_AUDIO_CLIPPING 31
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#define MIDI_CC_CPU_LATENCY 32
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extern int current_midi_effect_idx;
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bool handle_midi_packet(const uint8_t packet[4]);
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void usb_midi_write(const uint8_t packet[4]);
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void uart_midi_write(const uint8_t packet[4]);
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static inline void send_midi_cc(uint8_t cc, uint8_t val)
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{
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uint8_t packet[4] = { 0x0B, 0xB0, cc, val };
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usb_midi_write(packet);
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uart_midi_write(packet);
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}
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static inline void send_midi_pc(uint8_t pc)
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{
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uint8_t packet[4] = { 0x0C, 0xC0, pc, 0 };
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usb_midi_write(packet);
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uart_midi_write(packet);
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}
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static inline void send_midi_note_on(uint8_t ch, uint8_t note, uint8_t vel)
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{
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uint8_t packet[4] = { 0x09, 0x90 | (ch & 0x0F), note, vel };
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usb_midi_write(packet);
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uart_midi_write(packet);
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}
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static inline void send_midi_note_off(uint8_t ch, uint8_t note, uint8_t vel)
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{
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uint8_t packet[4] = { 0x08, 0x80 | (ch & 0x0F), note, vel };
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usb_midi_write(packet);
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uart_midi_write(packet);
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}
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static inline void send_midi_pitch_bend(uint8_t ch, int16_t bend)
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{
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uint16_t val = bend + 8192;
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uint8_t packet[4] = { 0x0E, 0xE0 | (ch & 0x0F), val & 0x7F, (val >> 7) & 0x7F };
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usb_midi_write(packet);
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uart_midi_write(packet);
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}
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static inline void send_midi_channel_pressure(uint8_t ch, uint8_t pressure)
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{
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uint8_t packet[4] = { 0x0D, 0xD0 | (ch & 0x0F), pressure & 0x7F, 0 };
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usb_midi_write(packet);
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uart_midi_write(packet);
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}
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