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pycom / pycom-micropython-sigfox

A fork of MicroPython with the ESP32 port customized to run on Pycom's IoT multi-network modules.
MIT License
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LoPy 4 Guru Meditation Error #381

Open ifiwaspresident opened 4 years ago

ifiwaspresident commented 4 years ago

Hey there,

I have a LoPy 4 with an extension board. I am reading a sensor and send the measurement via LoRaWAN. It runs good for maybe 10 minutes or so when the loop reaches this line it crashes:

        lora.nvram_save()

I wrapped that line in a try statement but it does not catch it. Is there something I can do or is it some low level problem?

Board description: Pycom MicroPython 1.20.1.r2 [v1.11-06dfad0] on 2019-11-30; LoPy4 with ESP32 Pybytes Version: 1.3.0 Type "help()" for more information.

Uploading project (main folder)... Safe booting device... (see settings for more info)

Uploading to /flash... Reading file status [1/1] Writing file main.py (3kb) Upload done, resetting board... OKets Jun 8 2016 00:22:57

rst:0x7 (TG0WDT_SYS_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT) configsip: 0, SPIWP:0xee clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00 mode:DIO, clock div:1 load:0x3fff8020,len:8 load:0x3fff8028,len:2136 load:0x4009fa00,len:19880 entry 0x400a05d0 Smart Provisioning started in the background See https://docs.pycom.io/smart for details

Error Code: Guru Meditation Error: Core 1 panic'ed (Cache disabled but cached memory region accessed) Guru Meditation Error: Core 1 panic'ed (IllegalInstruction). Exception was unhandled. Memory dump at 0x40202728: bad00bad bad00bad bad00bad

robert-hh commented 4 years ago

In order to isolate effects, you could try to disable pybytes. For that, you have to create a file on the lopy4 with the name: pybytes_config.json and the content

{ "pybytes_autostart": false }

You may also try to use the firmware build provided by @andreas. Info e.g. here: https://forum.pycom.io/topic/5560/guru-meditation-error/11 I wonder also that you do frequent lora.nvram_save() calls. That is typically only required before going to deepsleep or poweroff.

ifiwaspresident commented 4 years ago

Thanks for the fast reply!

Disabling Pybytes seem to help. The board is working fine for now. So this is a nvram access problem? Where Pybytes is writing something to the nvram and lora.nvram_save() does not wait for the other process to finish? (or the other way around)

amotl commented 4 years ago

Disabling Pybytes seem to help. The board is working fine for now.

Good to hear! Thanks for pointing out to disable Pybytes, @robert-hh!

So this is a nvram access problem? Where Pybytes is writing something to the nvram and lora.nvram_save() does not wait for the other process to finish? (or the other way around)

Maybe. May I humbly ask whether you are using LoRa callbacks, threads and/or alarm timers within your MicroPython program?