micropython/ports/rp2/mpbthciport.c

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/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2021 Ibrahim Abdelkader <iabdalkader@openmv.io>
*
* 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 "py/runtime.h"
#include "py/stream.h"
#include "py/mphal.h"
#include "extmod/modbluetooth.h"
#include "extmod/mpbthci.h"
#include "modmachine.h"
#include "mpbthciport.h"
#include "pico/stdlib.h"
#if MICROPY_PY_BLUETOOTH
#define debug_printf(...) // mp_printf(&mp_plat_print, "mpbthciport.c: " __VA_ARGS__)
#define error_printf(...) mp_printf(&mp_plat_print, "mpbthciport.c: " __VA_ARGS__)
// Poll timer ID.
static alarm_id_t poll_timer_id = 0;
uint8_t mp_bluetooth_hci_cmd_buf[4 + 256];
// Prevent double-enqueuing of the scheduled task.
STATIC volatile bool events_task_is_scheduled;
void mp_bluetooth_hci_init(void) {
events_task_is_scheduled = false;
}
STATIC void mp_bluetooth_hci_start_polling(void) {
events_task_is_scheduled = false;
mp_bluetooth_hci_poll_now();
}
static int64_t mp_bluetooth_hci_timer_callback(alarm_id_t id, void *user_data) {
poll_timer_id = 0;
mp_bluetooth_hci_poll_now();
return 0;
}
void mp_bluetooth_hci_poll_in_ms(uint32_t ms) {
poll_timer_id = add_alarm_in_ms(ms, mp_bluetooth_hci_timer_callback, NULL, true);
}
// For synchronous mode, we run all BLE stack code inside a scheduled task.
// This task is scheduled periodically via a timer, or immediately after UART RX IRQ.
STATIC mp_obj_t run_events_scheduled_task(mp_obj_t none_in) {
(void)none_in;
events_task_is_scheduled = false;
// This will process all buffered HCI UART data, and run any callouts or events.
mp_bluetooth_hci_poll();
return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(run_events_scheduled_task_obj, run_events_scheduled_task);
// Called periodically (systick) or directly (e.g. UART RX IRQ) in order to
// request that processing happens ASAP in the scheduler.
void mp_bluetooth_hci_poll_now(void) {
if (!events_task_is_scheduled) {
events_task_is_scheduled = mp_sched_schedule(MP_OBJ_FROM_PTR(&run_events_scheduled_task_obj), mp_const_none);
if (!events_task_is_scheduled) {
// The schedule queue is full, set callback to try again soon.
mp_bluetooth_hci_poll_in_ms(5);
}
}
}
mp_obj_t mp_bthci_uart;
int mp_bluetooth_hci_uart_init(uint32_t port, uint32_t baudrate) {
debug_printf("mp_bluetooth_hci_uart_init\n");
mp_obj_t args[] = {
MP_OBJ_NEW_SMALL_INT(MICROPY_HW_BLE_UART_ID),
MP_OBJ_NEW_SMALL_INT(MICROPY_HW_BLE_UART_BAUDRATE),
MP_OBJ_NEW_QSTR(MP_QSTR_flow), MP_OBJ_NEW_SMALL_INT((1 | 2)),
MP_OBJ_NEW_QSTR(MP_QSTR_timeout), MP_OBJ_NEW_SMALL_INT(1000),
};
// This is a statically-allocated UART (see machine_uart.c), and doesn't
// contain any heap pointers other than the ringbufs (which are already
// root pointers), so no need to track this as a root pointer.
mp_bthci_uart = machine_uart_type.make_new((mp_obj_t)&machine_uart_type, 2, 2, args);
// Start the HCI polling to process any initial events/packets.
mp_bluetooth_hci_start_polling();
return 0;
}
int mp_bluetooth_hci_uart_deinit(void) {
debug_printf("mp_bluetooth_hci_uart_deinit\n");
// If a poll callback is set cancel it now.
if (poll_timer_id > 0) {
cancel_alarm(poll_timer_id);
}
poll_timer_id = 0;
return 0;
}
int mp_bluetooth_hci_uart_set_baudrate(uint32_t baudrate) {
debug_printf("mp_bluetooth_hci_uart_set_baudrate(%lu)\n", baudrate);
return 0;
}
int mp_bluetooth_hci_uart_any(void) {
int errcode = 0;
const mp_stream_p_t *proto = (mp_stream_p_t *)machine_uart_type.protocol;
mp_uint_t ret = proto->ioctl(mp_bthci_uart, MP_STREAM_POLL, MP_STREAM_POLL_RD, &errcode);
if (errcode != 0) {
error_printf("Uart ioctl failed to poll UART %d\n", errcode);
return -1;
}
return ret & MP_STREAM_POLL_RD;
}
int mp_bluetooth_hci_uart_write(const uint8_t *buf, size_t len) {
debug_printf("mp_bluetooth_hci_uart_write\n");
int errcode = 0;
const mp_stream_p_t *proto = (mp_stream_p_t *)machine_uart_type.protocol;
mp_bluetooth_hci_controller_wakeup();
if (proto->write(mp_bthci_uart, (void *)buf, len, &errcode) < 0) {
error_printf("mp_bluetooth_hci_uart_write: failed to write to UART %d\n", errcode);
}
return 0;
}
// This function expects the controller to be in the wake state via a previous call
// to mp_bluetooth_hci_controller_woken.
int mp_bluetooth_hci_uart_readchar(void) {
debug_printf("mp_bluetooth_hci_uart_readchar\n");
if (mp_bluetooth_hci_uart_any()) {
int errcode = 0;
uint8_t buf = 0;
const mp_stream_p_t *proto = (mp_stream_p_t *)machine_uart_type.protocol;
if (proto->read(mp_bthci_uart, (void *)&buf, 1, &errcode) < 0) {
error_printf("mp_bluetooth_hci_uart_readchar: failed to read UART %d\n", errcode);
return -1;
}
return buf;
} else {
debug_printf("mp_bluetooth_hci_uart_readchar: not ready\n");
return -1;
}
}
// Default (weak) implementation of the HCI controller interface.
// A driver (e.g. cywbt43.c) can override these for controller-specific
// functionality (i.e. power management).
MP_WEAK int mp_bluetooth_hci_controller_init(void) {
debug_printf("mp_bluetooth_hci_controller_init (default)\n");
return 0;
}
MP_WEAK int mp_bluetooth_hci_controller_deinit(void) {
debug_printf("mp_bluetooth_hci_controller_deinit (default)\n");
return 0;
}
MP_WEAK int mp_bluetooth_hci_controller_sleep_maybe(void) {
debug_printf("mp_bluetooth_hci_controller_sleep_maybe (default)\n");
return 0;
}
MP_WEAK bool mp_bluetooth_hci_controller_woken(void) {
debug_printf("mp_bluetooth_hci_controller_woken (default)\n");
return true;
}
MP_WEAK int mp_bluetooth_hci_controller_wakeup(void) {
debug_printf("mp_bluetooth_hci_controller_wakeup (default)\n");
return 0;
}
#endif // MICROPY_PY_BLUETOOTH