TTGO TBEAM axp2101 V1.2 BAttery Chargeing

[sivaelid]

Describe the bug The Issue is that while in the latest dev firmware does enable the powing of the Lora and GPS modules The charge circuit and battery management do now work. It is seen form otehr bug reports that there are still issues with the APX2101 PMU..

Looking at otehr uses of the T-Beam v1.2 such as TTN they have incorporated the Library and the configuration is seen in posts https://www.thethingsnetwork.org/forum/t/new-t-beam-version-1-2/63918/10 with specifically configuration of the charge setting to be // Set constant current charge current limit PMU->setChargerConstantCurr(XPOWERS_AXP2101_CHG_CUR_500MA);

    // Set charge cut-off voltage
    PMU->setChargeTargetVoltage(XPOWERS_AXP2101_CHG_VOL_4V2);

I hope above helps

To Reproduce

Use TTGO T-Beam and plug in power supply to Micro USB and power board . A blue flashing light ( Charge Light is flashing) but it never put charge in the battery, and the battery will go flat if used. The battery can not be charged back up.

Expected behavior That the with the power supply connect to a 5v Micro plug and pluged into the board that the battery voltage will be charged with in the limits of the settings above.

Version and specific configuration:

• (version devel20230829)

Additional context There are otehr issues noted elsewhere where the Voltage measurment and E Gauge are missing apart form that the board work in the basic settings.

[sivaelid]

Additional information . The control registeres need to be defined in PMU.cpp, PMU.h and set to be used. these register are not used in either the current dev or the pull request (SzczepanLeon) for the AXP2101 that set up reading data. The registers:
Precharge current limit 0x61 is default to 125mA this is ok , Charging termination current limit 0x62 is set to default 0 mA ( No charge) needs to be typically set to 500mA Code 01011, Charging termination current limit 0x63 is set to default 125mA

Great work Simon.

[dl9rdz]

This is(was) more tricky than expected, but seems to be fine in my test setup now: All those registers you mentioned would work with their default values as well, these are not the reason for the T-Beam not charging the battery. The important part to make it actually work is to disable the TC ADC channel in register 0x30!

You can connect an external temperature sensor for the battery to TC. With the measurement enabled (which is the case by default), the AXP2101 assumes it can measure the battery´s temperature. Without the right sensor (which the T-Beam 1.2 does not have), this causes the AXP2101 to enter an error state (abnormal battery temperature)

(Indeed there is a comment in this regard in the meshtastic source code as well...)

[sivaelid]

Thanks for that I will look into the temperature thermistor issue I did not spot that. Look forward to updated code. Have a good week. Simon G8HAMSent from my iPhoneOn 3 Dec 2023, at 22:15, dl9rdz @.***> wrote: This is(was) more tricky than expected, but seems to be fine in my test setup now: All those registers you mentioned would work with their default values as well, these are not the reason for the T-Beam not charging the battery. The important part to make it actually work is to disable the TC ADC channel in register 0x30! You can connect an external temperature sensor for the battery to TC. With the measurement enabled (which is the case by default), the AXP2101 assumes it can measure the battery´s temperature. Without the right sensor (which the T-Beam 1.2 does not have), this causes the AXP2101 to enter an error state (abnormal battery temperature)

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[dl9rdz]

Should be fixed in the latest devel release (20231203).