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// midi for embedded chips,
// Copyright 2010 Alex Norman
//
// This file is part of avr-midi.
//
// avr-midi 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 3 of the License, or
//(at your option) any later version.
//
// avr-midi 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 avr-midi. If not, see <http://www.gnu.org/licenses/>.
/**
* @file
* @brief Device implementation functions
*/
#pragma once
#ifdef __cplusplus
extern "C" {
#endif
/**
* @defgroup midi_device Functions used when implementing your own midi device.
*
* 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
*
* @{
*/
#include "midi_function_types.h"
#include "bytequeue/bytequeue.h"
#define MIDI_INPUT_QUEUE_LENGTH 192
typedef enum { IDLE, ONE_BYTE_MESSAGE = 1, TWO_BYTE_MESSAGE = 2, THREE_BYTE_MESSAGE = 3, SYSEX_MESSAGE } input_state_t;
typedef void (*midi_no_byte_func_t)(MidiDevice* device);
/**
* \struct _midi_device
*
* @brief 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.
*/
struct _midi_device {
// output send function
midi_var_byte_func_t send_func;
//********input callbacks
// three byte funcs
midi_three_byte_func_t input_cc_callback;
midi_three_byte_func_t input_noteon_callback;
midi_three_byte_func_t input_noteoff_callback;
midi_three_byte_func_t input_aftertouch_callback;
midi_three_byte_func_t input_pitchbend_callback;
midi_three_byte_func_t input_songposition_callback;
// two byte funcs
midi_two_byte_func_t input_progchange_callback;
midi_two_byte_func_t input_chanpressure_callback;
midi_two_byte_func_t input_songselect_callback;
midi_two_byte_func_t input_tc_quarterframe_callback;
// one byte funcs
midi_one_byte_func_t input_realtime_callback;
midi_one_byte_func_t input_tunerequest_callback;
// sysex
midi_sysex_func_t input_sysex_callback;
// only called if more specific callback is not matched
midi_var_byte_func_t input_fallthrough_callback;
// called if registered, independent of other callbacks
midi_var_byte_func_t input_catchall_callback;
// pre input processing function
midi_no_byte_func_t pre_input_process_callback;
// for internal input processing
uint8_t input_buffer[3];
input_state_t input_state;
uint16_t input_count;
// for queueing data between the input and the processing functions
uint8_t input_queue_data[MIDI_INPUT_QUEUE_LENGTH];
byteQueue_t input_queue;
};
/**
* @brief 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.
*
* @param device the midi device to associate the input with
* @param cnt the number of bytes you are processing
* @param input the bytes to process
*/
void midi_device_input(MidiDevice* device, uint8_t cnt, uint8_t* input);
/**
* @brief 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.
*
* \param device the midi device to associate this callback with
* \param send_func the callback function that will do the sending
*/
void midi_device_set_send_func(MidiDevice* device, midi_var_byte_func_t send_func);
/**
* @brief 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.
*
* \param device the midi device to associate this callback with
* \param midi_no_byte_func_t the actual callback function
*/
void midi_device_set_pre_input_process_func(MidiDevice* device, midi_no_byte_func_t pre_process_func);
/**@}*/
#ifdef __cplusplus
}
#endif
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