circuitpython/ports/raspberrypi/common-hal/wifi/ScannedNetworks.c

115 lines
3.7 KiB
C

/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2019 Dan Halbert for Adafruit Industries
* Copyright (c) 2018 Artur Pacholec
* Copyright (c) 2017 Glenn Ruben Bakke
*
* 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 "shared/runtime/interrupt_char.h"
#include "py/gc.h"
#include "py/objstr.h"
#include "py/runtime.h"
#include "common-hal/wifi/__init__.h"
#include "shared-bindings/wifi/__init__.h"
#include "shared-bindings/wifi/Network.h"
#include "shared-bindings/wifi/Radio.h"
#include "shared-bindings/wifi/ScannedNetworks.h"
#define NUM_SCAN (16)
static cyw43_ev_scan_result_t scan_results[NUM_SCAN];
static uint8_t scan_put, scan_get;
static bool scan_full;
static void scan_result_put(const cyw43_ev_scan_result_t *result) {
if (!scan_full) {
scan_results[scan_put] = *result;
scan_put = (scan_put + 1) % NUM_SCAN;
scan_full = (scan_put == scan_get);
}
}
static bool scan_result_available(void) {
return scan_full || (scan_get != scan_put);
}
static cyw43_ev_scan_result_t *scan_result_get(cyw43_ev_scan_result_t *result) {
if (!scan_result_available()) {
return NULL;
}
*result = scan_results[scan_get];
scan_get = (scan_get + 1) % NUM_SCAN;
scan_full = false;
return result;
}
// Note: It's not OK to allocate memory in here, we can be called at a bad time
// which messes up the gc allocator
static int scan_result(void *env, const cyw43_ev_scan_result_t *result) {
wifi_scannednetworks_obj_t *self = common_hal_wifi_radio_obj.current_scan;
// scan ended or something
if (!self) {
return 0;
}
scan_result_put(result);
return 0;
}
mp_obj_t common_hal_wifi_scannednetworks_next(wifi_scannednetworks_obj_t *self) {
// no results available, wait for some
while (!scan_result_available() && cyw43_wifi_scan_active(&cyw43_state)) {
RUN_BACKGROUND_TASKS;
if (mp_hal_is_interrupted()) {
return mp_const_none;
}
cyw43_arch_poll();
}
if (!scan_result_available()) {
common_hal_wifi_radio_obj.current_scan = NULL;
return mp_const_none;
}
wifi_network_obj_t *entry = mp_obj_malloc(wifi_network_obj_t, &wifi_network_type);
scan_result_get(&entry->record);
return MP_OBJ_FROM_PTR(entry);
}
void wifi_scannednetworks_deinit(wifi_scannednetworks_obj_t *self) {
// there's actually no way to stop an ongoing scan in cyw43!
common_hal_wifi_radio_obj.current_scan = NULL;
}
void wifi_scannednetworks_start_scan(wifi_scannednetworks_obj_t *self) {
cyw43_wifi_scan_options_t scan_options = {0};
CHECK_CYW_RESULT(cyw43_wifi_scan(&cyw43_state, &scan_options, NULL, scan_result));
}