circuitpython/ports/unix/mpbtstackport_usb.c

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/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2020 Jim Mussared
*
* 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 <pthread.h>
#include <unistd.h>
#include "py/runtime.h"
#include "py/mperrno.h"
#include "py/mphal.h"
#if MICROPY_PY_BLUETOOTH && MICROPY_BLUETOOTH_BTSTACK && MICROPY_BLUETOOTH_BTSTACK_USB
#include "lib/btstack/src/btstack.h"
#include "lib/btstack/src/hci_transport_usb.h"
#include "lib/btstack/platform/embedded/btstack_run_loop_embedded.h"
#include "lib/btstack/platform/embedded/hal_cpu.h"
#include "lib/btstack/platform/embedded/hal_time_ms.h"
#include "extmod/btstack/modbluetooth_btstack.h"
#include "mpbtstackport.h"
#if !MICROPY_PY_THREAD
#error Unix btstack requires MICROPY_PY_THREAD
#endif
STATIC const useconds_t USB_POLL_INTERVAL_US = 1000;
void mp_bluetooth_btstack_port_init_usb(void) {
// MICROPYBTUSB can be a ':'' or '-' separated port list.
char *path = getenv("MICROPYBTUSB");
if (path != NULL) {
uint8_t usb_path[7] = {0};
size_t usb_path_len = 0;
while (usb_path_len < MP_ARRAY_SIZE(usb_path)) {
char *delimiter;
usb_path[usb_path_len++] = strtol(path, &delimiter, 16);
if (!delimiter || (*delimiter != ':' && *delimiter != '-')) {
break;
}
path = delimiter + 1;
}
hci_transport_usb_set_path(usb_path_len, usb_path);
}
hci_init(hci_transport_usb_instance(), NULL);
}
STATIC pthread_t bstack_thread_id;
void mp_bluetooth_btstack_port_deinit(void) {
hci_power_control(HCI_POWER_OFF);
// Wait for the poll loop to terminate when the state is set to OFF.
pthread_join(bstack_thread_id, NULL);
}
// Provided by mpbstackport_common.c.
extern bool mp_bluetooth_hci_poll(void);
STATIC void *btstack_thread(void *arg) {
(void)arg;
hci_power_control(HCI_POWER_ON);
// modbluetooth_btstack.c will have set the state to STARTING before
// calling mp_bluetooth_btstack_port_start.
// This loop will terminate when the HCI_POWER_OFF above results
// in modbluetooth_btstack.c setting the state back to OFF.
// Or, if a timeout results in it being set to TIMEOUT.
while (true) {
if (!mp_bluetooth_hci_poll()) {
break;
}
// The USB transport schedules events to the run loop at 1ms intervals,
// and the implementation currently polls rather than selects.
usleep(USB_POLL_INTERVAL_US);
}
return NULL;
}
void mp_bluetooth_btstack_port_start(void) {
// Create a thread to run the btstack loop.
pthread_attr_t attr;
pthread_attr_init(&attr);
pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
pthread_create(&bstack_thread_id, &attr, &btstack_thread, NULL);
}
#endif // MICROPY_PY_BLUETOOTH && MICROPY_BLUETOOTH_BTSTACK && MICROPY_BLUETOOTH_BTSTACK_USB