qmk_firmware/docs/internals/midi_device.md

group midi_device {#groupmididevice}

You use the functions when you are implementing your own midi device.

You set a send function to actually send bytes via your device, this method is called when you call a send function with this device, for instance midi_send_cc

You use the midi_device_input to process input data from the device and pass it through the device's associated callbacks.

You use the midi_device_set_pre_input_process_func if you want to have a function called at the beginning of the device's process function, generally to poll for input and pass that into midi_device_input

Summary

Members	Descriptions
defineMIDI_INPUT_QUEUE_LENGTH
enuminput_state_t
public voidmidi_device_input(MidiDevice* device,uint8_t cnt,uint8_t * input)	Process input bytes. This function parses bytes and calls the appropriate callbacks associated with the given device. You use this function if you are creating a custom device and you want to have midi input.
public voidmidi_device_set_send_func(MidiDevice* device,midi_var_byte_func_t send_func)	Set the callback function that will be used for sending output data bytes. This is only used if you're creating a custom device. You'll most likely want the callback function to disable interrupts so that you can call the various midi send functions without worrying about locking.
public voidmidi_device_set_pre_input_process_func(MidiDevice* device,midi_no_byte_func_t pre_process_func)	Set a callback which is called at the beginning of the midi_device_process call. This can be used to poll for input data and send the data through the midi_device_input function. You'll probably only use this if you're creating a custom device.
struct_midi_device	This structure represents the input and output functions and processing data for a midi device.

Members

defineMIDI_INPUT_QUEUE_LENGTH {#groupmididevice_1ga4aaa419caebdca2bbdfc1331e79781a8}

enuminput_state_t {#groupmididevice_1gac203e877d3df4275ceb8e7180a61f621}

Values	Descriptions
IDLE
ONE_BYTE_MESSAGE
TWO_BYTE_MESSAGE
THREE_BYTE_MESSAGE
SYSEX_MESSAGE

public voidmidi_device_input(MidiDevice* device,uint8_t cnt,uint8_t * input) {#groupmididevice_1gad8d3db8eb35d9cfa51ef036a0a9d70db}

Process input bytes. This function parses bytes and calls the appropriate callbacks associated with the given device. You use this function if you are creating a custom device and you want to have midi input.

Parameters

• device the midi device to associate the input with

• cnt the number of bytes you are processing

• input the bytes to process

public voidmidi_device_set_send_func(MidiDevice* device,midi_var_byte_func_t send_func) {#groupmididevice_1ga59f5a46bdd4452f186cc73d9e96d4673}

Set the callback function that will be used for sending output data bytes. This is only used if you're creating a custom device. You'll most likely want the callback function to disable interrupts so that you can call the various midi send functions without worrying about locking.

Parameters

• device the midi device to associate this callback with

• send_func the callback function that will do the sending

public voidmidi_device_set_pre_input_process_func(MidiDevice* device,midi_no_byte_func_t pre_process_func) {#groupmididevice_1ga4de0841b87c04fc23cb56b6451f33b69}

Set a callback which is called at the beginning of the midi_device_process call. This can be used to poll for input data and send the data through the midi_device_input function. You'll probably only use this if you're creating a custom device.

Parameters

• device the midi device to associate this callback with

• midi_no_byte_func_t the actual callback function

struct _midi_device {#structmididevice}

This structure represents the input and output functions and processing data for a midi device.

A device can represent an actual physical device [serial port, usb port] or something virtual. You should not need to modify this structure directly.

Summary

Members	Descriptions
public midi_var_byte_func_tsend_func
public midi_three_byte_func_tinput_cc_callback
public midi_three_byte_func_tinput_noteon_callback
public midi_three_byte_func_tinput_noteoff_callback
public midi_three_byte_func_tinput_aftertouch_callback
public midi_three_byte_func_tinput_pitchbend_callback
public midi_three_byte_func_tinput_songposition_callback
public midi_two_byte_func_tinput_progchange_callback
public midi_two_byte_func_tinput_chanpressure_callback
public midi_two_byte_func_tinput_songselect_callback
public midi_two_byte_func_tinput_tc_quarterframe_callback
public midi_one_byte_func_tinput_realtime_callback
public midi_one_byte_func_tinput_tunerequest_callback
public midi_sysex_func_tinput_sysex_callback
public midi_var_byte_func_tinput_fallthrough_callback
public midi_var_byte_func_tinput_catchall_callback
public midi_no_byte_func_tpre_input_process_callback
public uint8_tinput_buffer
public input_state_tinput_state
public uint16_tinput_count
public uint8_tinput_queue_data
publicbyteQueue_tinput_queue

Members

public midi_var_byte_func_tsend_func {#structmididevice_1a25d4c94b4bbccd5b98f1032b469f3ff9}

public midi_three_byte_func_tinput_cc_callback {#structmididevice_1a6da5236c1bc73877728df92d213a78d1}

public midi_three_byte_func_tinput_noteon_callback {#structmididevice_1aa10b15cf1a7fb825a5df0d2abbe34a1c}

public midi_three_byte_func_tinput_noteoff_callback {#structmididevice_1aaf290043078534d3a5a0ea4c840eba84}

public midi_three_byte_func_tinput_aftertouch_callback {#structmididevice_1acb0b4901c545cec4b28b126f2d8c315f}

public midi_three_byte_func_tinput_pitchbend_callback {#structmididevice_1a305fea672caeb996f2233bf8cd2bef18}

public midi_three_byte_func_tinput_songposition_callback {#structmididevice_1a5f3f13638b3fef3fc561ed1bf301d586}

public midi_two_byte_func_tinput_progchange_callback {#structmididevice_1adaf1da617c9a10a9dcad00ab1959d3da}

public midi_two_byte_func_tinput_chanpressure_callback {#structmididevice_1ab7ca2925c539915d43974eff604d85f7}

public midi_two_byte_func_tinput_songselect_callback {#structmididevice_1a89bed8a5a55376120cfc0a62b42f057f}

public midi_two_byte_func_tinput_tc_quarterframe_callback {#structmididevice_1ad9813e75d22e284f9f65a907d20600f0}

public midi_one_byte_func_tinput_realtime_callback {#structmididevice_1a9448eba4afb7e43650434748db3777be}

public midi_one_byte_func_tinput_tunerequest_callback {#structmididevice_1a0cb8fd53e00cf1d4202d4fa04d038e8d}

public midi_sysex_func_tinput_sysex_callback {#structmididevice_1afff9a0ce641762aaef24c1e6953ec9a2}

public midi_var_byte_func_tinput_fallthrough_callback {#structmididevice_1abb974ec6d734001b4a0e370f292be503}

public midi_var_byte_func_tinput_catchall_callback {#structmididevice_1aae0d535129d4fd650edc98eb3f7584f8}

public midi_no_byte_func_tpre_input_process_callback {#structmididevice_1aeb0bb8923d66c23d874e177dc4265754}

public uint8_tinput_buffer {#structmididevice_1a7c5684857d6af4ebc4dc12da27bd6b2a}

public input_state_tinput_state {#structmididevice_1a69a687d2d1c449ec15a11c07a5722e39}

public uint16_tinput_count {#structmididevice_1a68dea8e7b6151e89c85c95caa612ee5d}

public uint8_tinput_queue_data {#structmididevice_1ada41de021135dc423abedcbb30f366ff}

publicbyteQueue_tinput_queue {#structmididevice_1a49c8538a8a02193c58e28a56eb695d8f}