most M5Stack Arduino API , you can find it from this page.

link:https://docs.m5stack.com/#/en/arduino/arduino_api

So, I have 2 m5stack core with me.

My idea is to have these 2(or potentially more) to communicate with each other via LoRa, one to be a sensor node, and another acts as a receiver.

The receiving node will then upload the data received from the sensing node to thingspeak.

The components used in this system is the ENV sensor, and the LoRa modules.

I hope this explains what I am trying to do.

You need just one Serial;
Serial.begin(10000000);
//connect to proper TX<>RX pins of M5Stack

For proper debug you can connect sensor with any USB<>UART board and try to run it with any terminal software (I use TeraTerm)

If you want to debug derictly with M5Stack you will need Serial2 as your example shows, but keep in mind that if its a software serial, such high speed wont work properly most likely

Hi @steinoxyd ,
I had the same issue which I got help with on the m5stack github before seeing this. I may as well direct you straight to it than repeating it fully here;
https://github.com/m5stack/M5Stack/issues/194
The issue is the 'IMU.calibrateMPU9250(IMU.gyroBias, IMU.accelBias);' which if commented out, the code will run.
From the comment from @lukasmaximus I have not realised the probable reason for the issue.

for m5stack its possible with the lovyan launcher, I'm not sure if @lovyan03 is working on a stickC version

@mr-clay said in A fatal error occurred: MD5 of file does not match data in flash!:

sorry for resurrecting this post from the dead but where exactly do you run the esptool --port <YOUR PORT> write_flash_status --non-volatile 0 command?

You run this in a terminal or command line program.
Replace YOUR PORT with the name of the port that appears in arduino. On windows this may be COM followed by a number on OSX this is often somelike USBslab.

I know I'm late to the game but I just bought one of these. Did you ever manage to connect it to your m5stack @dfabro ? if not I'm gonna try, and if I'm successful will post my findings here

You need to have pc-end software to decode what m5stack sends
Read about sockets

I cant really help you beyond pointing you in a rough direction as I dont understand the registers.

I only recognised that they were reg calls from an arduino tutorial that came up once on youtubes feed,

nobody??

@wikistik I have tried that, but the Windows system seems to be trying to insert a random outdated driver for the USB cable instead of the one you suggested. You're right, though, because on a different Windows 7 computer, I installed the drivers and it started working automatically.

Hi
Txs, I found it and will order one. It is indeed the most easy sollution.
Henk.

Please use esptool from command line and use the erase flash command and see if your problem persists https://github.com/espressif/esptool

solved on commenting out

gpio_deep_sleep_hold_dis();

in

Documents/Arduino/libraries/M5Stack/src/utility/Power.cpp

I don't know why, but now arduino compile