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Xinyuan-LilyGO / LilyGo-LoRa-Series

LILYGO LoRa Series examples
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axp192 reset #87

Closed Marcotic closed 1 year ago

Marcotic commented 1 year ago

Hi. I was having problems with the battery and the axp192 not charging and by mistake i uploaded a code where i set dcd1 voltage to 1.2v. Now my tbeam v1.1 is not booting anymore. Red led lights on boot but immediately shuts down. I cannot upload anymore. Is there a way to reset axp192. Or reflashing the board without using usb? Thanks

lewisxhe commented 1 year ago
  1. Discount the power supply of USB and batteries
  2. Connect GPIO0 and GND through the wires
  3. Insert USB
  4. Upload the right sketch
  5. After the upload is completed, open the USB and connect again
Marcotic commented 1 year ago

THank you so much!!!!

I was able to upload again.

I still have the issue of the battery. Tbeam wont run with battery only. Battery is fully charged. It wont charge it neither. Any advice

lewisxhe commented 1 year ago

image Do you have a multimeter? The voltage at these two points can be measured See if it's normal

Marcotic commented 1 year ago

Measured 4.05 volts.

lewisxhe commented 1 year ago

Did you press the PWR button for two seconds?

Marcotic commented 1 year ago

Uploaded LoRa sender code form the repo, measured before pressing 4.04, measured after pressing 2sc same 4.04.

lewisxhe commented 1 year ago

Can I turn off the board power supply by pressing and holding the PWR button if I use USB power supply?

Marcotic commented 1 year ago

Yes. It turns off when holding power button until it stops.

lewisxhe commented 1 year ago

image Then measure whether there is voltage at these two points

Marcotic commented 1 year ago

voltage of the last two points: usb powered: Normal 4.88 after 8 sc holding power 4.95 on battery powered..no red led, 1.32

I just noticed that measuring into first two the points the ones from the https://github.com/Xinyuan-LilyGO/LilyGo-LoRa-Series/issues/87#issuecomment-1486515120 image, it has 3.85volts. I f it helps...

Marcotic commented 1 year ago

any idea??

lewisxhe commented 1 year ago

Sorry, I forgot to reply to you

  1. PWR can be used for power-on and power-off operations when using USB
  2. Measure the voltage at two points of the MOS tube in the picture
  3. Unable to start the machine when using the battery alone, (press and hold the PWR button for two seconds) Please confirm the above precautions. If all conditions are met, it is likely that the AXP192 is damaged