Supports auxiliary power control.

[XuGuohui]

Example App

#include "application.h"

SYSTEM_MODE(SEMI_AUTOMATIC);

SerialLogHandler l(LOG_LEVEL_ALL);

uint8_t auxPwrPin = D23;

STARTUP(System.enableFeature(FEATURE_ETHERNET_DETECTION));

STARTUP({
    System.setPowerConfiguration(SystemPowerConfiguration().auxPowerControlPin(auxPwrPin).feature(SystemPowerFeature::PMIC_DETECTION));
});

void setup() {
    while (!Serial.isConnected()) {
        delay(100);
    }
    Log.info("Application started");
}

void loop() {
    if (Serial.available()) {
        char c = Serial.read();
        switch (c) {
            case 'i': {
                if_list* ifs = nullptr;
                if_get_list(&ifs);
                for (if_list* iface = ifs; iface != nullptr; iface = iface->next) {
                    if (iface->iface) {
                        uint8_t idx;
                        if_get_index(iface->iface, &idx);
                        Log.info("Interface %d: %s", idx, iface->iface->name);
                    }
                }
                if_free_list(ifs);
                break;
            }
            case 'p': {
                Log.info("Connecting to Particle Cloud...");
                Particle.connect();
                break;
            }
            case 'w': {
                Log.info("Connecting to Wi-Fi...");
                WiFi.connect();
                break;
            }
            case 'c': {
                Log.info("Connecting to Cellular...");
                Cellular.connect();
                break;
            }
            case 'e': {
                Log.info("Connecting to Ethernet...");
                Ethernet.connect();
                break;
            }
            case 'd': {
                Log.info("Connecting to Particle Cloud...");
                Particle.disconnect();
                break;
            }
            case 'o': {
                Log.info("Turning on the auxiliary power...");
                digitalWrite(auxPwrPin, HIGH);
                break;
            }
            case 'f': {
                Log.info("Turning off the auxiliary power...");
                digitalWrite(auxPwrPin, LOW);
                break;
            }
            default: break;
        }
    }
}

---

Completeness

• User is totes amazing for contributing!
• Contributor has signed CLA (Info here)
• Problem and Solution clearly stated
• Run unit/integration/application tests on device
• Added documentation
• Added to CHANGELOG.md after merging (add links to docs and issues)

[scott-brust]

I tested MSOM on an old EVB, with the onboard wiznet chip (just to make things easier)

I confirmed that the D23 / aux power pin is asserted on boot before setup() completes, and that the en2 netif is populated (because the EVB already powers it on by default).

I confirmed that when pulling the ethernet jumpers, and breaking ethernet communication to the msom, that the en2 netif is removed from the list of lwip IFs after boot.

I think the PR as currently written can be used for muon / m2 breakout to control the aux power at boot

[scott-brust]

Maybe Log a warning here to make it clear PMIC isnt detected?

[scott-brust]

Also, previously this would call self->deinit();
Do we need to call this still in this case or if we are exiting during init, there is nothing to de-init at this point? (maybe just unconfigure the aux power control pin?)

[XuGuohui]

I think the previous goto exit, in which it calls self->deinit() is mainly for calling os_thread_exit() to exit the thread. But here is the very begining of the init() function, if the PMIC is not detected we can simply return. As for the aux power control pin, it is required when the power module for DC power supply is installed, on which there is no PMIC, but we still need to enable the aux power control pin.