Big ESP32 + SX127x topic part 3

Verkehrsrot · September 9, 2019, 8:12pm

I got a TTGO T-Beam V1.0 and enhanced the paxcounter software to support some of the new board features:

GPS PPS interrupt line
PMU (power management unit)
Two Buttons

As PMU an x-powers.com AXP192 chip is used. Although this is an older model dated around 2011, is has a bunch of interesting features, look at the data sheet (unfortunately chinese only, does anyone has english version?)

In paxcounter code i added some examples for the various power interrupts - works! Now you can easyly trigger on power events, like battery connected/removed, USB plug connected/removed, battery overheated/charged etc.

The second user button is also controlled by the PMU.

github.com

cyberman54/ESP32-Paxcounter/blob/master/src/power.cpp#L18


#ifdef HAS_PMU


AXP20X_Class pmu;


void pover_event_IRQ(void) {
  // block i2c bus access
  if (I2C_MUTEX_LOCK()) {
    pmu.readIRQ();
    // put your power event handler code here


    if (pmu.isVbusOverVoltageIRQ())
      ESP_LOGI(TAG, "USB voltage too high.");
    if (pmu.isVbusPlugInIRQ())
      ESP_LOGI(TAG, "USB plugged.");
    if (pmu.isVbusRemoveIRQ())
      ESP_LOGI(TAG, "USB unplugged.");


    if (pmu.isBattPlugInIRQ())
      ESP_LOGI(TAG, "Battery is connected.");
    if (pmu.isBattRemoveIRQ())
      ESP_LOGI(TAG, "Battery was removed.");