<![CDATA[LO1 OEM struggles to upload data via Pymakr or ampy.]]>Hi all,

I recently created a custom board for my project that contains an OEM LO1 module. I use FTDI FT230R Basic UART to communicate with it. I am able to connect to REPL very reliably, however when I try to upload files I get different errors such as

Failed to write file, trying again...

It works maybe once in 5 times, especially if I turn off and on the UART cable.
I tried couple different firmwares, no difference. Once in a while I also receive

Guru Meditation Error: Core  1 panic'ed (IllegalInstruction)

error. Could this mean there's something wrong with the ESP32 itself?

Is there anything such as a certain pin not being pulled up that could cause that? I have a LoPy with the expansion board to use as a reference but I can't seem to find anything that is out of place on my board.

0_1543145653083_cd663bce-2c7d-4794-853d-68b7358a21d3-image.png

Above is the circuitry around the LO1 module, hope that helps.

Many thanks,
Miro

]]>https://forum.pycom.io/topic/4033/lo1-oem-struggles-to-upload-data-via-pymakr-or-ampyRSS for NodeFri, 11 Sep 2026 14:04:31 GMTSun, 25 Nov 2018 11:39:23 GMT60<![CDATA[Reply to LO1 OEM struggles to upload data via Pymakr or ampy. on Sun, 25 Nov 2018 11:40:16 GMT]]>Hi all,

I recently created a custom board for my project that contains an OEM LO1 module. I use FTDI FT230R Basic UART to communicate with it. I am able to connect to REPL very reliably, however when I try to upload files I get different errors such as

Failed to write file, trying again...

It works maybe once in 5 times, especially if I turn off and on the UART cable.
I tried couple different firmwares, no difference. Once in a while I also receive

Guru Meditation Error: Core  1 panic'ed (IllegalInstruction)

error. Could this mean there's something wrong with the ESP32 itself?

Is there anything such as a certain pin not being pulled up that could cause that? I have a LoPy with the expansion board to use as a reference but I can't seem to find anything that is out of place on my board.

0_1543145653083_cd663bce-2c7d-4794-853d-68b7358a21d3-image.png

Above is the circuitry around the LO1 module, hope that helps.

Many thanks,
Miro

]]>https://forum.pycom.io/post/23745https://forum.pycom.io/post/23745Sun, 25 Nov 2018 11:40:16 GMT<![CDATA[Reply to LO1 OEM struggles to upload data via Pymakr or ampy. on Sun, 25 Nov 2018 13:15:21 GMT]]>In my opinion RESET pin should not be left floating. Try to connect pull-up resistor to 3.3V in 10k-20k range.
Check L01 OEM Baseboard schematic:
https://docs.pycom.io/product-info-datasheets/oem/l01_reference

Edit: Sorry, now I noticed the reset pull-up already being in your schematic. Anyway try to use FTP client for script uploading.

]]>https://forum.pycom.io/post/23751https://forum.pycom.io/post/23751Sun, 25 Nov 2018 13:15:21 GMT