circuitpython/ports/esp32s2/common-hal/wifi/ScannedNetworks.c

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/*
* 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 "lib/utils/interrupt_char.h"
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#include "py/gc.h"
#include "py/objstr.h"
#include "py/runtime.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"
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#include "components/esp_wifi/include/esp_wifi.h"
static void wifi_scannednetworks_done(wifi_scannednetworks_obj_t *self) {
self->done = true;
if (self->results != NULL) {
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// Check to see if the heap is still active. If not, it'll be freed automatically.
if (gc_alloc_possible()) {
m_free(self->results);
}
self->results = NULL;
}
}
static bool wifi_scannednetworks_wait_for_scan(wifi_scannednetworks_obj_t *self) {
EventBits_t bits = xEventGroupWaitBits(self->radio_event_group,
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WIFI_SCAN_DONE_BIT,
pdTRUE,
pdTRUE,
0);
while ((bits & WIFI_SCAN_DONE_BIT) == 0 && !mp_hal_is_interrupted()) {
RUN_BACKGROUND_TASKS;
bits = xEventGroupWaitBits(self->radio_event_group,
WIFI_SCAN_DONE_BIT,
pdTRUE,
pdTRUE,
0);
}
return !mp_hal_is_interrupted();
}
mp_obj_t common_hal_wifi_scannednetworks_next(wifi_scannednetworks_obj_t *self) {
if (self->done) {
return mp_const_none;
}
// If we are scanning, wait and then load them.
if (self->scanning) {
// We may have to scan more than one channel to get a result.
while (!self->done) {
if (!wifi_scannednetworks_wait_for_scan(self)) {
wifi_scannednetworks_done(self);
return mp_const_none;
}
esp_wifi_scan_get_ap_num(&self->total_results);
self->scanning = false;
if (self->total_results > 0) {
break;
}
// If total_results is zero then we need to start a scan and wait again.
wifi_scannednetworks_scan_next_channel(self);
}
// We not have found any more results so we're done.
if (self->done) {
return mp_const_none;
}
// If we need more space than we have, realloc.
if (self->total_results > self->max_results) {
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wifi_ap_record_t *results = m_renew_maybe(wifi_ap_record_t,
self->results,
self->max_results,
self->total_results,
true /* allow move */);
if (results != NULL) {
self->results = results;
self->max_results = self->total_results;
} else {
if (self->max_results == 0) {
// No room for any results should error.
mp_raise_msg(&mp_type_MemoryError, translate("Failed to allocate wifi scan memory"));
}
// Unable to allocate more results, so load what we can.
self->total_results = self->max_results;
}
}
esp_wifi_scan_get_ap_records(&self->total_results, self->results);
self->scanning = false;
}
wifi_network_obj_t *entry = m_new_obj(wifi_network_obj_t);
entry->base.type = &wifi_network_type;
memcpy(&entry->record, &self->results[self->current_result], sizeof(wifi_ap_record_t));
self->current_result++;
// If we're returning our last network then start the next channel scan or
// be done.
if (self->current_result >= self->total_results) {
wifi_scannednetworks_scan_next_channel(self);
self->total_results = 0;
self->current_result = 0;
}
return MP_OBJ_FROM_PTR(entry);
}
// We don't do a linear scan so that we look at a variety of spectrum up front.
static uint8_t scan_pattern[] = {6, 1, 11, 3, 9, 13, 2, 4, 8, 12, 5, 7, 10, 14};
void wifi_scannednetworks_scan_next_channel(wifi_scannednetworks_obj_t *self) {
uint8_t next_channel = sizeof(scan_pattern);
while (self->current_channel_index < sizeof(scan_pattern)) {
next_channel = scan_pattern[self->current_channel_index];
self->current_channel_index++;
if (self->start_channel <= next_channel && next_channel <= self->end_channel) {
break;
}
}
wifi_scan_config_t config = { 0 };
config.channel = next_channel;
if (next_channel == sizeof(scan_pattern)) {
wifi_scannednetworks_done(self);
} else {
esp_err_t result = esp_wifi_scan_start(&config, false);
if (result != ESP_OK) {
wifi_scannednetworks_done(self);
} else {
self->scanning = true;
}
}
}
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void wifi_scannednetworks_deinit(wifi_scannednetworks_obj_t *self) {
// if a scan is active, make sure and clean up the idf's buffer of results.
if (self->scanning) {
esp_wifi_scan_stop();
if (wifi_scannednetworks_wait_for_scan(self)) {
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// Ignore the number of records since we're throwing them away.
uint16_t number = 0;
esp_wifi_scan_get_ap_records(&number, NULL);
self->scanning = false;
}
}
wifi_scannednetworks_done(self);
}