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// This file is part of the CircuitPython project: https://circuitpython.org
//
// SPDX-FileCopyrightText: Copyright (c) 2018 hathach for Adafruit Industries
//
// SPDX-License-Identifier: MIT
#include "shared-bindings/usb_midi/__init__.h"
#include "py/gc.h"
#include "py/obj.h"
#include "py/mphal.h"
#include "py/runtime.h"
#include "py/objtuple.h"
#include "shared-bindings/usb_midi/PortIn.h"
#include "shared-bindings/usb_midi/PortOut.h"
#include "supervisor/usb.h"
#include "tusb.h"
static const uint8_t usb_midi_descriptor_template[] = {
// Audio Interface Descriptor
0x09, // 0 bLength
0x04, // 1 bDescriptorType (Interface)
0xFF, // 2 bInterfaceNumber [SET AT RUNTIME]
#define MIDI_AUDIO_CONTROL_INTERFACE_NUMBER_INDEX (2)
0x00, // 3 bAlternateSetting
0x00, // 4 bNumEndpoints 0
0x01, // 5 bInterfaceClass (Audio)
0x01, // 6 bInterfaceSubClass (Audio Control)
0x00, // 7 bInterfaceProtocol
0xFF, // 8 iInterface (String Index) [SET AT RUNTIME]
#define MIDI_AUDIO_CONTROL_INTERFACE_STRING_INDEX (8)
// Audio10 Control Interface Descriptor
0x09, // 9 bLength
0x24, // 10 bDescriptorType (See Next Line)
0x01, // 11 bDescriptorSubtype (CS_INTERFACE -> HEADER)
0x00, 0x01, // 12,13 bcdADC 1.00
0x09, 0x00, // 14,15 wTotalLength 9
0x01, // 16 binCollection 0x01
0xFF, // 17 baInterfaceNr [SET AT RUNTIME: one-element list: same as 20]
#define MIDI_STREAMING_INTERFACE_NUMBER_INDEX_2 (17)
// MIDI Streaming Interface Descriptor
0x09, // 18 bLength
0x04, // 19 bDescriptorType (Interface)
0xFF, // 20 bInterfaceNumber [SET AT RUNTIME]
#define MIDI_STREAMING_INTERFACE_NUMBER_INDEX (20)
0x00, // 21 bAlternateSetting
0x02, // 22 bNumEndpoints 2
0x01, // 23 bInterfaceClass (Audio)
0x03, // 24 bInterfaceSubClass (MIDI Streaming)
0x00, // 25 bInterfaceProtocol
0xFF, // 26 iInterface (String Index) [SET AT RUNTIME]
#define MIDI_STREAMING_INTERFACE_STRING_INDEX (26)
// MIDI Header Descriptor
0x07, // 27 bLength
0x24, // 28 bDescriptorType: CLASS SPECIFIC INTERFACE
0x01, // 29 bDescriptorSubtype: MIDI STREAMING HEADER
0x00, 0x01, // 30,31 bsdMSC (MIDI STREAMING) version 1.0
0x25, 0x00, // 32,33 wLength
// MIDI Embedded In Jack Descriptor
0x06, // 34 bLength
0x24, // 35 bDescriptorType: CLASS SPECIFIC INTERFACE
0x02, // 36 bDescriptorSubtype: MIDI IN JACK
0x01, // 37 bJackType: EMBEDDED
0x01, // 38 id (always 1)
0xFF, // 39 iJack (String Index) [SET AT RUNTIME]
#define MIDI_IN_JACK_STRING_INDEX (39)
// MIDI External In Jack Descriptor
0x06, // 40 bLength
0x24, // 41 bDescriptorType: CLASS SPECIFIC INTERFACE
0x02, // 42 bDescriptorSubtype: MIDI IN JACK
0x02, // 43 bJackType: EXTERNAL
0x02, // 44 bJackId (always 2)
0x00, // 45 iJack (String Index)
// MIDI Embedded Out Jack Descriptor
0x09, // 46 bLength
0x24, // 47 bDescriptorType: CLASS SPECIFIC INTERFACE
0x03, // 48 bDescriptorSubtype: MIDI OUT JACK
0x01, // 49 bJackType: EMBEDDED
0x03, // 50 bJackID (always 3)
0x01, // 51 bNrInputPins (always 1)
0x02, // 52 BaSourceID(1) (always 2)
0x01, // 53 BaSourcePin(1) (always 1)
0xFF, // 54 iJack (String Index) [SET AT RUNTIME]
#define MIDI_OUT_JACK_STRING_INDEX (54)
// MIDI External Out Jack Descriptor
0x09, // 55 bLength
0x24, // 56 bDescriptorType: CLASS SPECIFIC INTERFACE
0x03, // 57 bDescriptorSubtype: MIDI OUT JACK
0x02, // 58 bJackType: EXTERNAL
0x04, // 59 bJackID (always 4)
0x01, // 60 bNrInputPins (always 1)
0x01, // 61 BaSourceID(1) (always 1)
0x01, // 62 BaSourcePin(1) (always 1)
0x00, // 63 iJack (String Index)
// MIDI Streaming Endpoint OUT Descriptor
0x07, // 64 bLength
0x05, // 65 bDescriptorType (EndPoint)
0xFF, // 66 bEndpointAddress (OUT/H2D) [SET AT RUNTIME]
#define MIDI_STREAMING_OUT_ENDPOINT_INDEX (66)
0x02, // 67 bmAttributes (Bulk)
#if CIRCUITPY_USB_DEVICE_HIGH_SPEED == 1
0x00, 0x02, // 68,69 wMaxPacketSize (512)
#else
0x40, 0x00, // 68,69 wMaxPacketSize (64)
#endif
0x00, // 70 bInterval 0 (unit depends on device speed)
// MIDI Data Endpoint Descriptor
0x05, // 71 bLength
0x25, // 72 bDescriptorType: CLASS SPECIFIC ENDPOINT
0x01, // 73 bDescriptorSubtype: MIDI STREAMING 1.0
0x01, // 74 bNumGrpTrmBlock (always 1)
0x01, // 75 baAssoGrpTrmBlkID(1) (always 1)
// MIDI IN Data Endpoint
0x07, // 76 bLength
0x05, // 77 bDescriptorType: Endpoint
0xFF, // 78 bEndpointAddress (IN/D2H) [SET AT RUNTIME: 0x80 | number]
#define MIDI_STREAMING_IN_ENDPOINT_INDEX (78)
0x02, // 79 bmAttributes (Bulk)
#if CIRCUITPY_USB_DEVICE_HIGH_SPEED == 1
0x00, 0x02, // 80, 81 wMaxPacketSize (512)
#else
0x40, 0x00, // 80, 81 wMaxPacketSize (64)
#endif
0x00, // 82 bInterval 0 (unit depends on device speed)
// MIDI Data Endpoint Descriptor
0x05, // 83 bLength
0x25, // 84 bDescriptorType: CLASS SPECIFIC ENDPOINT
0x01, // 85 bDescriptorSubtype: MIDI STREAMING 1.0
0x01, // 86 bNumGrpTrmBlock (always 1)
0x03, // 87 baAssoGrpTrmBlkID(1) (always 3)
};
// Is the USB MIDI device enabled?
static bool usb_midi_is_enabled;
void usb_midi_set_defaults(void) {
usb_midi_is_enabled = CIRCUITPY_USB_MIDI_ENABLED_DEFAULT;
}
bool usb_midi_enabled(void) {
return usb_midi_is_enabled;
}
size_t usb_midi_descriptor_length(void) {
return sizeof(usb_midi_descriptor_template);
}
char *custom_usb_midi_streaming_interface_name = NULL;
char *custom_usb_midi_audio_control_interface_name = NULL;
char *custom_usb_midi_in_jack_name = NULL;
char *custom_usb_midi_out_jack_name = NULL;
size_t usb_midi_add_descriptor(uint8_t *descriptor_buf, descriptor_counts_t *descriptor_counts, uint8_t *current_interface_string) {
const char *midi_streaming_interface_name;
const char *midi_audio_control_interface_name;
const char *midi_in_jack_name;
const char *midi_out_jack_name;
memcpy(descriptor_buf, usb_midi_descriptor_template, sizeof(usb_midi_descriptor_template));
descriptor_buf[MIDI_AUDIO_CONTROL_INTERFACE_NUMBER_INDEX] = descriptor_counts->current_interface;
descriptor_counts->current_interface++;
descriptor_buf[MIDI_STREAMING_IN_ENDPOINT_INDEX] =
0x80 | (USB_MIDI_EP_NUM_IN ? USB_MIDI_EP_NUM_IN : descriptor_counts->current_endpoint);
descriptor_counts->num_in_endpoints++;
// Some TinyUSB devices have issues with bi-directional endpoints
#ifdef TUD_ENDPOINT_ONE_DIRECTION_ONLY
descriptor_counts->current_endpoint++;
#endif
descriptor_buf[MIDI_STREAMING_OUT_ENDPOINT_INDEX] =
USB_MIDI_EP_NUM_OUT ? USB_MIDI_EP_NUM_OUT : descriptor_counts->current_endpoint;
descriptor_counts->num_out_endpoints++;
descriptor_counts->current_endpoint++;
descriptor_buf[MIDI_STREAMING_INTERFACE_NUMBER_INDEX] = descriptor_counts->current_interface;
descriptor_buf[MIDI_STREAMING_INTERFACE_NUMBER_INDEX_2] = descriptor_counts->current_interface;
descriptor_counts->current_interface++;
if (custom_usb_midi_streaming_interface_name == NULL) {
midi_streaming_interface_name = USB_INTERFACE_NAME " MIDI";
} else {
midi_streaming_interface_name = custom_usb_midi_streaming_interface_name;
}
usb_add_interface_string(*current_interface_string, midi_streaming_interface_name);
descriptor_buf[MIDI_STREAMING_INTERFACE_STRING_INDEX] = *current_interface_string;
(*current_interface_string)++;
if (custom_usb_midi_audio_control_interface_name == NULL) {
midi_audio_control_interface_name = USB_INTERFACE_NAME " Audio";
} else {
midi_audio_control_interface_name = custom_usb_midi_audio_control_interface_name;
}
usb_add_interface_string(*current_interface_string, midi_audio_control_interface_name);
descriptor_buf[MIDI_AUDIO_CONTROL_INTERFACE_STRING_INDEX] = *current_interface_string;
(*current_interface_string)++;
if (custom_usb_midi_in_jack_name == NULL) {
midi_in_jack_name = USB_INTERFACE_NAME " usb_midi.ports[0]";
} else {
midi_in_jack_name = custom_usb_midi_in_jack_name;
}
usb_add_interface_string(*current_interface_string, midi_in_jack_name);
descriptor_buf[MIDI_IN_JACK_STRING_INDEX] = *current_interface_string;
(*current_interface_string)++;
if (custom_usb_midi_out_jack_name == NULL) {
midi_out_jack_name = USB_INTERFACE_NAME " usb_midi.ports[0]";
} else {
midi_out_jack_name = custom_usb_midi_out_jack_name;
}
usb_add_interface_string(*current_interface_string, midi_out_jack_name);
descriptor_buf[MIDI_OUT_JACK_STRING_INDEX] = *current_interface_string;
(*current_interface_string)++;
return sizeof(usb_midi_descriptor_template);
}
static const usb_midi_portin_obj_t midi_portin_obj = {
.base = {
.type = &usb_midi_portin_type,
},
};
static const usb_midi_portout_obj_t midi_portout_obj = {
.base = {
.type = &usb_midi_portout_type,
}
};
static const mp_rom_obj_tuple_t midi_ports_tuple = {
.base = {
.type = &mp_type_tuple,
},
.len = 2,
.items = {
MP_ROM_PTR(&midi_portin_obj),
MP_ROM_PTR(&midi_portout_obj),
},
};
void usb_midi_setup_ports(void) {
// Right now midi_ports_tuple contains no heap objects, but if it does in the future,
// it will need to be protected against gc.
mp_obj_tuple_t *ports = usb_midi_is_enabled ? MP_OBJ_FROM_PTR(&midi_ports_tuple) : mp_const_empty_tuple;
mp_map_lookup(&usb_midi_module_globals.map, MP_ROM_QSTR(MP_QSTR_ports), MP_MAP_LOOKUP)->value =
MP_OBJ_FROM_PTR(ports);
}
static bool usb_midi_set_enabled(bool enabled) {
// We can't change the descriptors once we're connected.
if (tud_connected()) {
return false;
}
usb_midi_is_enabled = enabled;
return true;
}
bool common_hal_usb_midi_disable(void) {
return usb_midi_set_enabled(false);
}
bool common_hal_usb_midi_enable(void) {
return usb_midi_set_enabled(true);
}
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