357 lines
11 KiB
C
357 lines
11 KiB
C
/*
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* The MIT License (MIT)
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*
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* Copyright (c) 2019 Ha Thach (tinyusb.org)
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*
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* This file is part of the TinyUSB stack.
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*/
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#include "tusb_option.h"
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#if (TUSB_OPT_DEVICE_ENABLED && CFG_TUD_MIDI)
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//--------------------------------------------------------------------+
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// INCLUDE
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//--------------------------------------------------------------------+
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#include "midi_device.h"
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#include "class/audio/audio.h"
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#include "device/usbd_pvt.h"
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//--------------------------------------------------------------------+
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// MACRO CONSTANT TYPEDEF
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//--------------------------------------------------------------------+
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typedef struct
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{
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uint8_t itf_num;
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uint8_t ep_in;
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uint8_t ep_out;
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/*------------- From this point, data is not cleared by bus reset -------------*/
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// FIFO
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tu_fifo_t rx_ff;
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tu_fifo_t tx_ff;
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uint8_t rx_ff_buf[CFG_TUD_MIDI_RX_BUFSIZE];
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uint8_t tx_ff_buf[CFG_TUD_MIDI_TX_BUFSIZE];
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#if CFG_FIFO_MUTEX
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osal_mutex_def_t rx_ff_mutex;
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osal_mutex_def_t tx_ff_mutex;
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#endif
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// We need to pack messages into words before queueing their transmission so buffer across write
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// calls.
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uint8_t message_buffer[4];
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uint8_t message_buffer_length;
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uint8_t message_target_length;
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// Endpoint Transfer buffer
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CFG_TUSB_MEM_ALIGN uint8_t epout_buf[CFG_TUD_MIDI_EPSIZE];
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CFG_TUSB_MEM_ALIGN uint8_t epin_buf[CFG_TUD_MIDI_EPSIZE];
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} midid_interface_t;
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#define ITF_MEM_RESET_SIZE offsetof(midid_interface_t, rx_ff)
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//--------------------------------------------------------------------+
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// INTERNAL OBJECT & FUNCTION DECLARATION
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//--------------------------------------------------------------------+
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CFG_TUSB_MEM_SECTION midid_interface_t _midid_itf[CFG_TUD_MIDI];
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bool tud_midi_n_mounted (uint8_t itf)
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{
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midid_interface_t* midi = &_midid_itf[itf];
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return midi->ep_in && midi->ep_out;
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}
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//--------------------------------------------------------------------+
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// READ API
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//--------------------------------------------------------------------+
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uint32_t tud_midi_n_available(uint8_t itf, uint8_t jack_id)
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{
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(void) jack_id;
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return tu_fifo_count(&_midid_itf[itf].rx_ff);
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}
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uint32_t tud_midi_n_read(uint8_t itf, uint8_t jack_id, void* buffer, uint32_t bufsize)
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{
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(void) jack_id;
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return tu_fifo_read_n(&_midid_itf[itf].rx_ff, buffer, bufsize);
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}
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void tud_midi_n_read_flush (uint8_t itf, uint8_t jack_id)
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{
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(void) jack_id;
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tu_fifo_clear(&_midid_itf[itf].rx_ff);
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}
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void midi_rx_done_cb(midid_interface_t* midi, uint8_t const* buffer, uint32_t bufsize) {
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if (bufsize % 4 != 0) {
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return;
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}
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for(uint32_t i=0; i<bufsize; i += 4) {
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uint8_t header = buffer[i];
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// uint8_t cable_number = (header & 0xf0) >> 4;
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uint8_t code_index = header & 0x0f;
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// We always copy over the first byte.
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uint8_t count = 1;
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// Ignore subsequent bytes based on the code.
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if (code_index != 0x5 && code_index != 0xf) {
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count = 2;
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if (code_index != 0x2 && code_index != 0x6 && code_index != 0xc && code_index != 0xd) {
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count = 3;
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}
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}
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tu_fifo_write_n(&midi->rx_ff, &buffer[i + 1], count);
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}
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}
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//--------------------------------------------------------------------+
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// WRITE API
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//--------------------------------------------------------------------+
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static bool maybe_transmit(midid_interface_t* midi, uint8_t itf_index)
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{
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(void) itf_index;
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// skip if previous transfer not complete
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TU_VERIFY( !usbd_edpt_busy(TUD_OPT_RHPORT, midi->ep_in) );
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uint16_t count = tu_fifo_read_n(&midi->tx_ff, midi->epin_buf, CFG_TUD_MIDI_EPSIZE);
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if (count > 0)
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{
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TU_ASSERT( usbd_edpt_xfer(TUD_OPT_RHPORT, midi->ep_in, midi->epin_buf, count) );
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}
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return true;
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}
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uint32_t tud_midi_n_write(uint8_t itf, uint8_t jack_id, uint8_t const* buffer, uint32_t bufsize)
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{
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midid_interface_t* midi = &_midid_itf[itf];
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if (midi->itf_num == 0) {
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return 0;
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}
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uint32_t i = 0;
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while (i < bufsize) {
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uint8_t data = buffer[i];
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if (midi->message_buffer_length == 0) {
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uint8_t msg = data >> 4;
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midi->message_buffer[1] = data;
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midi->message_buffer_length = 2;
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// Check to see if we're still in a SysEx transmit.
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if (midi->message_buffer[0] == 0x4) {
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if (data == 0xf7) {
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midi->message_buffer[0] = 0x5;
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} else {
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midi->message_buffer_length = 4;
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}
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} else if ((msg >= 0x8 && msg <= 0xB) || msg == 0xE) {
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midi->message_buffer[0] = jack_id << 4 | msg;
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midi->message_target_length = 4;
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} else if (msg == 0xC || msg == 0xD) {
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midi->message_buffer[0] = jack_id << 4 | msg;
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midi->message_target_length = 3;
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} else if (msg == 0xf) {
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if (data == 0xf0) {
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midi->message_buffer[0] = 0x4;
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midi->message_target_length = 4;
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} else if (data == 0xf1 || data == 0xf3) {
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midi->message_buffer[0] = 0x2;
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midi->message_target_length = 3;
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} else if (data == 0xf2) {
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midi->message_buffer[0] = 0x3;
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midi->message_target_length = 4;
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} else {
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midi->message_buffer[0] = 0x5;
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midi->message_target_length = 2;
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}
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} else {
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// Pack individual bytes if we don't support packing them into words.
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midi->message_buffer[0] = jack_id << 4 | 0xf;
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midi->message_buffer[2] = 0;
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midi->message_buffer[3] = 0;
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midi->message_buffer_length = 2;
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midi->message_target_length = 2;
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}
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} else {
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midi->message_buffer[midi->message_buffer_length] = data;
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midi->message_buffer_length += 1;
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// See if this byte ends a SysEx.
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if (midi->message_buffer[0] == 0x4 && data == 0xf7) {
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midi->message_buffer[0] = 0x4 + (midi->message_buffer_length - 1);
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midi->message_target_length = midi->message_buffer_length;
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}
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}
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if (midi->message_buffer_length == midi->message_target_length) {
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uint16_t written = tu_fifo_write_n(&midi->tx_ff, midi->message_buffer, 4);
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if (written < 4) {
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TU_ASSERT( written == 0 );
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break;
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}
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midi->message_buffer_length = 0;
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}
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i++;
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}
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maybe_transmit(midi, itf);
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return i;
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}
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//--------------------------------------------------------------------+
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// USBD Driver API
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//--------------------------------------------------------------------+
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void midid_init(void)
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{
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tu_memclr(_midid_itf, sizeof(_midid_itf));
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for(uint8_t i=0; i<CFG_TUD_MIDI; i++)
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{
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midid_interface_t* midi = &_midid_itf[i];
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// config fifo
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tu_fifo_config(&midi->rx_ff, midi->rx_ff_buf, CFG_TUD_MIDI_RX_BUFSIZE, 1, true);
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tu_fifo_config(&midi->tx_ff, midi->tx_ff_buf, CFG_TUD_MIDI_TX_BUFSIZE, 1, true);
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#if CFG_FIFO_MUTEX
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tu_fifo_config_mutex(&midi->rx_ff, osal_mutex_create(&midi->rx_ff_mutex));
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tu_fifo_config_mutex(&midi->tx_ff, osal_mutex_create(&midi->tx_ff_mutex));
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#endif
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}
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}
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void midid_reset(uint8_t rhport)
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{
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(void) rhport;
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for(uint8_t i=0; i<CFG_TUD_MIDI; i++)
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{
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midid_interface_t* midi = &_midid_itf[i];
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tu_memclr(midi, ITF_MEM_RESET_SIZE);
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tu_fifo_clear(&midi->rx_ff);
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tu_fifo_clear(&midi->tx_ff);
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}
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}
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bool midid_open(uint8_t rhport, tusb_desc_interface_t const * p_interface_desc, uint16_t *p_length)
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{
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// For now handle the audio control interface as well.
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if ( AUDIO_SUBCLASS_CONTROL == p_interface_desc->bInterfaceSubClass) {
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uint8_t const * p_desc = tu_desc_next ( (uint8_t const *) p_interface_desc );
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(*p_length) = sizeof(tusb_desc_interface_t);
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// Skip over the class specific descriptor.
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(*p_length) += tu_desc_len(p_desc);
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p_desc = tu_desc_next(p_desc);
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return true;
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}
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TU_VERIFY(AUDIO_SUBCLASS_MIDI_STREAMING == p_interface_desc->bInterfaceSubClass &&
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AUDIO_PROTOCOL_V1 == p_interface_desc->bInterfaceProtocol );
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// Find available interface
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midid_interface_t * p_midi = NULL;
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for(uint8_t i=0; i<CFG_TUD_MIDI; i++)
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{
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if ( _midid_itf[i].ep_in == 0 && _midid_itf[i].ep_out == 0 )
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{
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p_midi = &_midid_itf[i];
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break;
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}
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}
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p_midi->itf_num = p_interface_desc->bInterfaceNumber;
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uint8_t const * p_desc = tu_desc_next( (uint8_t const *) p_interface_desc );
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(*p_length) = sizeof(tusb_desc_interface_t);
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uint8_t found_endpoints = 0;
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while (found_endpoints < p_interface_desc->bNumEndpoints)
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{
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if ( TUSB_DESC_ENDPOINT == p_desc[DESC_OFFSET_TYPE])
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{
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TU_ASSERT( dcd_edpt_open(rhport, (tusb_desc_endpoint_t const *) p_desc), false);
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uint8_t ep_addr = ((tusb_desc_endpoint_t const *) p_desc)->bEndpointAddress;
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if (tu_edpt_dir(ep_addr) == TUSB_DIR_IN) {
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p_midi->ep_in = ep_addr;
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} else {
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p_midi->ep_out = ep_addr;
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}
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(*p_length) += p_desc[DESC_OFFSET_LEN];
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p_desc = tu_desc_next(p_desc);
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found_endpoints += 1;
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}
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(*p_length) += p_desc[DESC_OFFSET_LEN];
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p_desc = tu_desc_next(p_desc);
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}
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// Prepare for incoming data
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TU_ASSERT( usbd_edpt_xfer(rhport, p_midi->ep_out, p_midi->epout_buf, CFG_TUD_MIDI_EPSIZE), false);
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return true;
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}
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bool midid_control_complete(uint8_t rhport, tusb_control_request_t const * p_request)
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{
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(void) rhport;
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(void) p_request;
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return true;
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}
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bool midid_control_request(uint8_t rhport, tusb_control_request_t const * p_request)
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{
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(void) rhport;
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//------------- Class Specific Request -------------//
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if (p_request->bmRequestType_bit.type != TUSB_REQ_TYPE_CLASS) return false;
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return false;
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}
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bool midid_xfer_cb(uint8_t rhport, uint8_t ep_addr, xfer_result_t result, uint32_t xferred_bytes)
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{
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(void) result;
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// TODO Support multiple interfaces
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uint8_t const itf = 0;
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midid_interface_t* p_midi = &_midid_itf[itf];
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// receive new data
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if ( ep_addr == p_midi->ep_out )
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{
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midi_rx_done_cb(p_midi, p_midi->epout_buf, xferred_bytes);
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// prepare for next
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TU_ASSERT( usbd_edpt_xfer(rhport, p_midi->ep_out, p_midi->epout_buf, CFG_TUD_MIDI_EPSIZE), false );
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} else if ( ep_addr == p_midi->ep_in ) {
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maybe_transmit(p_midi, itf);
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}
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// nothing to do with in and notif endpoint
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return TUSB_ERROR_NONE;
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}
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#endif
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