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circuitpython/supervisor/shared/bluetooth.c

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/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2019 Scott Shawcroft for Adafruit Industries
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include <string.h>
#include "extmod/vfs.h"
#include "extmod/vfs_fat.h"
#include "shared-bindings/_bleio/__init__.h"
#include "shared-bindings/_bleio/Adapter.h"
#include "shared-bindings/_bleio/Characteristic.h"
#include "shared-bindings/_bleio/Service.h"
#include "shared-bindings/_bleio/UUID.h"
#include "common-hal/_bleio/__init__.h"
#include "supervisor/shared/autoreload.h"
#include "py/mpstate.h"
bleio_service_obj_t supervisor_ble_service;
bleio_uuid_obj_t supervisor_ble_service_uuid;
bleio_characteristic_obj_t supervisor_ble_version_characteristic;
bleio_uuid_obj_t supervisor_ble_version_uuid;
bleio_characteristic_obj_t supervisor_ble_filename_characteristic;
bleio_uuid_obj_t supervisor_ble_filename_uuid;
bleio_characteristic_obj_t supervisor_ble_length_characteristic;
bleio_uuid_obj_t supervisor_ble_length_uuid;
bleio_characteristic_obj_t supervisor_ble_contents_characteristic;
bleio_uuid_obj_t supervisor_ble_contents_uuid;
// This is the base UUID for CircuitPython services and characteristics.
const uint8_t circuitpython_base_uuid[16] = {0x6e, 0x68, 0x74, 0x79, 0x50, 0x74, 0x69, 0x75, 0x63, 0x72, 0x69, 0x43, 0x00, 0x00, 0xaf, 0xad };
// This standard advertisement advertises the CircuitPython editing service and a CIRCUITPY short name.
uint8_t circuitpython_advertising_data[] = { 0x02, 0x01, 0x06, 0x02, 0x0a, 0x00, 0x11, 0x07, 0x6e, 0x68, 0x74, 0x79, 0x50, 0x74, 0x69, 0x75, 0x63, 0x72, 0x69, 0x43, 0x00, 0x01, 0xaf, 0xad, 0x06, 0x08, 0x43, 0x49, 0x52, 0x43, 0x55 };
// This scan response advertises the full CIRCUITPYXXXX device name.
uint8_t circuitpython_scan_response_data[15] = {0x0e, 0x09, 0x43, 0x49, 0x52, 0x43, 0x55, 0x49, 0x54, 0x50, 0x59, 0x00, 0x00, 0x00, 0x00};
mp_obj_list_t service_list;
mp_obj_t service_list_items[1];
mp_obj_list_t characteristic_list;
mp_obj_t characteristic_list_items[4];
void supervisor_bluetooth_start_advertising(void) {
#if !CIRCUITPY_BLE_FILE_SERVICE
return;
#endif
bool is_connected = common_hal_bleio_adapter_get_connected(&common_hal_bleio_adapter_obj);
if (is_connected) {
return;
}
// TODO: switch to Adafruit short UUID for the advertisement and add manufacturing data to distinguish ourselves from arduino.
_common_hal_bleio_adapter_start_advertising(&common_hal_bleio_adapter_obj,
true,
false, 0,
1.0,
circuitpython_advertising_data,
sizeof(circuitpython_advertising_data),
circuitpython_scan_response_data,
sizeof(circuitpython_scan_response_data));
}
void supervisor_start_bluetooth(void) {
#if !CIRCUITPY_BLE_FILE_SERVICE
return;
#endif
common_hal_bleio_adapter_set_enabled(&common_hal_bleio_adapter_obj, true);
supervisor_ble_service_uuid.base.type = &bleio_uuid_type;
common_hal_bleio_uuid_construct(&supervisor_ble_service_uuid, 0x0100, circuitpython_base_uuid);
// We know we'll only be 1 characteristic so we can statically allocate it.
characteristic_list.base.type = &mp_type_list;
characteristic_list.alloc = sizeof(characteristic_list_items) / sizeof(characteristic_list_items[0]);
characteristic_list.len = 0;
characteristic_list.items = characteristic_list_items;
mp_seq_clear(characteristic_list.items, 0, characteristic_list.alloc, sizeof(*characteristic_list.items));
_common_hal_bleio_service_construct(&supervisor_ble_service, &supervisor_ble_service_uuid, false /* is secondary */, &characteristic_list);
// File length
supervisor_ble_version_uuid.base.type = &bleio_uuid_type;
common_hal_bleio_uuid_construct(&supervisor_ble_version_uuid, 0x0203, circuitpython_base_uuid);
common_hal_bleio_characteristic_construct(&supervisor_ble_version_characteristic,
&supervisor_ble_service,
0, // handle (for remote only)
&supervisor_ble_version_uuid,
CHAR_PROP_READ,
SECURITY_MODE_OPEN,
SECURITY_MODE_NO_ACCESS,
4, // max length
true, // fixed length
NULL); // no initial value
uint32_t version = 1;
mp_buffer_info_t bufinfo;
bufinfo.buf = &version;
bufinfo.len = sizeof(version);
common_hal_bleio_characteristic_set_value(&supervisor_ble_version_characteristic, &bufinfo);
// Active filename.
supervisor_ble_filename_uuid.base.type = &bleio_uuid_type;
common_hal_bleio_uuid_construct(&supervisor_ble_filename_uuid, 0x0200, circuitpython_base_uuid);
common_hal_bleio_characteristic_construct(&supervisor_ble_filename_characteristic,
&supervisor_ble_service,
0, // handle (for remote only)
&supervisor_ble_filename_uuid,
CHAR_PROP_READ | CHAR_PROP_WRITE,
SECURITY_MODE_OPEN,
SECURITY_MODE_OPEN,
500, // max length
false, // fixed length
NULL); // no initial value
char code_py[] = "/code.py";
bufinfo.buf = code_py;
bufinfo.len = sizeof(code_py);
common_hal_bleio_characteristic_set_value(&supervisor_ble_filename_characteristic, &bufinfo);
// File length
supervisor_ble_length_uuid.base.type = &bleio_uuid_type;
common_hal_bleio_uuid_construct(&supervisor_ble_length_uuid, 0x0202, circuitpython_base_uuid);
common_hal_bleio_characteristic_construct(&supervisor_ble_length_characteristic,
&supervisor_ble_service,
0, // handle (for remote only)
&supervisor_ble_length_uuid,
CHAR_PROP_NOTIFY | CHAR_PROP_READ,
SECURITY_MODE_OPEN,
SECURITY_MODE_NO_ACCESS,
4, // max length
true, // fixed length
NULL); // no initial value
// File actions
supervisor_ble_contents_uuid.base.type = &bleio_uuid_type;
common_hal_bleio_uuid_construct(&supervisor_ble_contents_uuid, 0x0201, circuitpython_base_uuid);
common_hal_bleio_characteristic_construct(&supervisor_ble_contents_characteristic,
&supervisor_ble_service,
0, // handle (for remote only)
&supervisor_ble_contents_uuid,
CHAR_PROP_NOTIFY | CHAR_PROP_WRITE_NO_RESPONSE | CHAR_PROP_WRITE,
SECURITY_MODE_OPEN,
SECURITY_MODE_OPEN,
500, // max length
false, // fixed length
NULL); // no initial value
supervisor_bluetooth_start_advertising();
vm_used_ble = false;
}
FIL active_file;
volatile bool new_filename;
volatile bool run_ble_background;
bool was_connected;
void update_file_length(void) {
int32_t file_length = -1;
mp_buffer_info_t bufinfo;
bufinfo.buf = &file_length;
bufinfo.len = sizeof(file_length);
if (active_file.obj.fs != 0) {
file_length = (int32_t) f_size(&active_file);
}
common_hal_bleio_characteristic_set_value(&supervisor_ble_length_characteristic, &bufinfo);
}
void open_current_file(void) {
if (active_file.obj.fs != 0) {
return;
}
uint16_t max_len = supervisor_ble_filename_characteristic.max_length;
uint8_t path[max_len];
size_t length = common_hal_bleio_characteristic_get_value(&supervisor_ble_filename_characteristic, path, max_len - 1);
path[length] = '\0';
FATFS *fs = &((fs_user_mount_t *) MP_STATE_VM(vfs_mount_table)->obj)->fatfs;
f_open(fs, &active_file, (char*) path, FA_READ | FA_WRITE);
update_file_length();
}
void close_current_file(void) {
f_close(&active_file);
}
uint32_t current_command[1024 / sizeof(uint32_t)];
volatile size_t current_offset;
void supervisor_bluetooth_background(void) {
#if !CIRCUITPY_BLE_FILE_SERVICE
return;
#endif
if (!run_ble_background) {
return;
}
bool is_connected = common_hal_bleio_adapter_get_connected(&common_hal_bleio_adapter_obj);
if (!was_connected && is_connected) {
open_current_file();
} else if (was_connected && !is_connected) {
close_current_file();
new_filename = false;
}
was_connected = is_connected;
run_ble_background = false;
if (!is_connected) {
supervisor_bluetooth_start_advertising();
return;
}
if (new_filename) {
close_current_file();
open_current_file();
new_filename = false;
// get length and set the characteristic for it
}
uint16_t current_length = ((uint16_t*) current_command)[0];
if (current_length > 0 && current_length == current_offset) {
uint16_t command = ((uint16_t *) current_command)[1];
if (command == 1) {
uint16_t max_len = 20; //supervisor_ble_contents_characteristic.max_length;
uint8_t buf[max_len];
mp_buffer_info_t bufinfo;
bufinfo.buf = buf;
f_lseek(&active_file, 0);
while (f_read(&active_file, buf, max_len, &bufinfo.len) == FR_OK) {
if (bufinfo.len == 0) {
break;
}
common_hal_bleio_characteristic_set_value(&supervisor_ble_contents_characteristic, &bufinfo);
}
} else if (command == 2) { // patch
uint32_t offset = current_command[1];
uint32_t remove_length = current_command[2];
uint32_t insert_length = current_command[3];
uint32_t file_length = (int32_t) f_size(&active_file);
//uint32_t data_shift_length = fileLength - offset - remove_length;
int32_t data_shift = insert_length - remove_length;
uint32_t new_length = file_length + data_shift;
// TODO: Make these loops smarter to read and write on sector boundaries.
if (data_shift < 0) {
for (uint32_t shift_offset = offset + insert_length; shift_offset < new_length; shift_offset++) {
uint8_t data;
UINT actual;
f_lseek(&active_file, shift_offset - data_shift);
f_read(&active_file, &data, 1, &actual);
f_lseek(&active_file, shift_offset);
f_write(&active_file, &data, 1, &actual);
}
f_truncate(&active_file);
} else if (data_shift > 0) {
f_lseek(&active_file, file_length);
// Fill end with 0xff so we don't need to erase.
uint8_t data = 0xff;
for (size_t i = 0; i < (size_t) data_shift; i++) {
UINT actual;
f_write(&active_file, &data, 1, &actual);
}
for (uint32_t shift_offset = new_length - 1; shift_offset >= offset + insert_length ; shift_offset--) {
UINT actual;
f_lseek(&active_file, shift_offset - data_shift);
f_read(&active_file, &data, 1, &actual);
f_lseek(&active_file, shift_offset);
f_write(&active_file, &data, 1, &actual);
}
}
f_lseek(&active_file, offset);
uint8_t* data = (uint8_t *) (current_command + 4);
UINT written;
f_write(&active_file, data, insert_length, &written);
f_sync(&active_file);
// Notify the new file length.
update_file_length();
// Trigger an autoreload
autoreload_now();
}
current_offset = 0;
}
}
// This happens in an interrupt so we need to be quick.
bool supervisor_bluetooth_hook(ble_evt_t *ble_evt) {
#if !CIRCUITPY_BLE_FILE_SERVICE
return false;
#endif
// Catch writes to filename or contents. Length is read-only.
bool done = false;
switch (ble_evt->header.evt_id) {
case BLE_GAP_EVT_CONNECTED:
// We run our background task even if it wasn't us connected to because we may want to
// advertise if the user code stopped advertising.
run_ble_background = true;
break;
case BLE_GAP_EVT_DISCONNECTED:
run_ble_background = true;
break;
case BLE_GATTS_EVT_WRITE: {
// A client wrote to a characteristic.
ble_gatts_evt_write_t *evt_write = &ble_evt->evt.gatts_evt.params.write;
// Event handle must match the handle for my characteristic.
if (evt_write->handle == supervisor_ble_contents_characteristic.handle) {
// Handle events
//write_to_ringbuf(self, evt_write->data, evt_write->len);
// First packet includes a uint16_t le for length at the start.
uint16_t current_length = ((uint16_t*) current_command)[0];
memcpy(((uint8_t*) current_command) + current_offset, evt_write->data, evt_write->len);
current_offset += evt_write->len;
current_length = ((uint16_t*) current_command)[0];
if (current_offset == current_length) {
run_ble_background = true;
done = true;
}
} else if (evt_write->handle == supervisor_ble_filename_characteristic.handle) {
new_filename = true;
run_ble_background = true;
done = true;
} else {
return done;
}
break;
}
default:
// For debugging.
// mp_printf(&mp_plat_print, "Unhandled peripheral event: 0x%04x\n", ble_evt->header.evt_id);
break;
}
return done;
}
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