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https://github.com/esp8266/Arduino.git
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c312a2eaf1
esp_yield() now also calls esp_schedule(), original esp_yield() function renamed to esp_suspend(). Don't use delay(0) in the Core internals, libraries and examples. Use yield() when the code is supposed to be called from CONT, use esp_yield() when the code can be called from either CONT or SYS. Clean-up esp_yield() and esp_schedule() declarations across the code and use coredecls.h instead. Implement helper functions for libraries that were previously using esp_yield(), esp_schedule() and esp_delay() directly to wait for certain SYS context tasks to complete. Correctly use esp_delay() for timeouts, make sure scheduled functions have a chance to run (e.g. LwIP_Ethernet uses recurrent) Related issues: - #6107 - discussion about the esp_yield() and esp_delay() usage in ClientContext - #6212 - discussion about replacing delay() with a blocking loop - #6680 - pull request introducing LwIP-based Ethernet - #7146 - discussion that originated UART code changes - #7969 - proposal to remove delay(0) from the example code - #8291 - discussion related to the run_scheduled_recurrent_functions() usage in LwIP Ethernet - #8317 - yieldUntil() implementation, similar to the esp_delay() overload with a timeout and a 0 interval
61 lines
1.6 KiB
C++
61 lines
1.6 KiB
C++
/*
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This sketch demonstrates how to scan WiFi networks.
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The API is almost the same as with the WiFi Shield library,
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the most obvious difference being the different file you need to include:
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*/
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#include <ESP8266WiFi.h>
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void setup() {
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Serial.begin(115200);
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Serial.println(F("\nESP8266 WiFi scan example"));
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// Set WiFi to station mode
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WiFi.mode(WIFI_STA);
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// Disconnect from an AP if it was previously connected
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WiFi.disconnect();
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delay(100);
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}
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void loop() {
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String ssid;
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int32_t rssi;
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uint8_t encryptionType;
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uint8_t* bssid;
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int32_t channel;
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bool hidden;
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int scanResult;
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Serial.println(F("Starting WiFi scan..."));
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scanResult = WiFi.scanNetworks(/*async=*/false, /*hidden=*/true);
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if (scanResult == 0) {
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Serial.println(F("No networks found"));
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} else if (scanResult > 0) {
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Serial.printf(PSTR("%d networks found:\n"), scanResult);
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// Print unsorted scan results
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for (int8_t i = 0; i < scanResult; i++) {
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WiFi.getNetworkInfo(i, ssid, encryptionType, rssi, bssid, channel, hidden);
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Serial.printf(PSTR(" %02d: [CH %02d] [%02X:%02X:%02X:%02X:%02X:%02X] %ddBm %c %c %s\n"),
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i,
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channel,
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bssid[0], bssid[1], bssid[2],
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bssid[3], bssid[4], bssid[5],
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rssi,
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(encryptionType == ENC_TYPE_NONE) ? ' ' : '*',
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hidden ? 'H' : 'V',
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ssid.c_str());
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yield();
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}
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} else {
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Serial.printf(PSTR("WiFi scan error %d"), scanResult);
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}
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// Wait a bit before scanning again
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delay(5000);
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}
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