circuitpython/ports/unix/btstack_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
#include "lib/btstack/src/btstack.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"
#if !MICROPY_PY_THREAD
#error Unix btstack requires MICROPY_PY_THREAD
#endif
STATIC const useconds_t USB_POLL_INTERVAL_US = 1000;
STATIC const uint8_t read_static_address_command_complete_prefix[] = { 0x0e, 0x1b, 0x01, 0x09, 0xfc };
STATIC uint8_t local_addr[6] = {0};
STATIC uint8_t static_address[6] = {0};
STATIC volatile bool have_addr = false;
STATIC bool using_static_address = false;
STATIC btstack_packet_callback_registration_t hci_event_callback_registration;
STATIC void packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size) {
(void)channel;
(void)size;
if (packet_type != HCI_EVENT_PACKET) {
return;
}
switch (hci_event_packet_get_type(packet)) {
case BTSTACK_EVENT_STATE:
if (btstack_event_state_get_state(packet) != HCI_STATE_WORKING) {
return;
}
gap_local_bd_addr(local_addr);
if (using_static_address) {
memcpy(local_addr, static_address, sizeof(local_addr));
}
have_addr = true;
break;
case HCI_EVENT_COMMAND_COMPLETE:
if (memcmp(packet, read_static_address_command_complete_prefix, sizeof(read_static_address_command_complete_prefix)) == 0) {
reverse_48(&packet[7], static_address);
gap_random_address_set(static_address);
using_static_address = true;
have_addr = true;
}
break;
default:
break;
}
}
// The IRQ functionality in btstack_run_loop_embedded.c is not used, so the
// following three functions are empty.
void hal_cpu_disable_irqs(void) {
}
void hal_cpu_enable_irqs(void) {
}
void hal_cpu_enable_irqs_and_sleep(void) {
}
uint32_t hal_time_ms(void) {
return mp_hal_ticks_ms();
}
void mp_bluetooth_btstack_port_init(void) {
static bool run_loop_init = false;
if (!run_loop_init) {
run_loop_init = true;
btstack_run_loop_init(btstack_run_loop_embedded_get_instance());
} else {
btstack_run_loop_embedded_get_instance()->init();
}
// TODO: allow setting USB device path via cmdline/env var.
// hci_dump_open(NULL, HCI_DUMP_STDOUT);
hci_init(hci_transport_usb_instance(), NULL);
hci_event_callback_registration.callback = &packet_handler;
hci_add_event_handler(&hci_event_callback_registration);
}
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);
have_addr = false;
}
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 (mp_bluetooth_btstack_state == MP_BLUETOOTH_BTSTACK_STATE_STARTING || mp_bluetooth_btstack_state == MP_BLUETOOTH_BTSTACK_STATE_ACTIVE) {
btstack_run_loop_embedded_execute_once();
// 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);
}
hci_close();
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);
}
void mp_hal_get_mac(int idx, uint8_t buf[6]) {
if (idx == MP_HAL_MAC_BDADDR) {
if (!have_addr) {
mp_raise_OSError(MP_ENODEV);
}
memcpy(buf, local_addr, sizeof(local_addr));
}
}
#endif // MICROPY_PY_BLUETOOTH && MICROPY_BLUETOOTH_BTSTACK