FYI, I discovered that the M5Unit-ENV library for PlatformIO is missing at least 1 commit compared to the one for the Arduino IDE, which is strange as they both advertise the same version: 0.0.8

I suspect that 0.0.8 has been re-issued as the release date on GitHub is from 2 weeks ago, an PlatformIO m5stack/M5Unit-ENV says: "Last Modified: a month ago"...

In the meantime, if you need the latest version, you can use the GitHub URL instead of the name in your lib_deps

@felmue That was the problem

Thank you very much!

Hi!

I can't get I2C working properly with my CoreS3...

Environment:

• CoreS3
• ENV-III sensor on Port A or Port B (no difference)
• Arduino IDE 2.2.1 with M5CoreS3 0.0.4
• Same with PlatformIO Core 6.1.11 with M5CoreS3 0.0.4

The issue is really weird:

1. Connect a sensor on Port A or B
2. Flash the "CoreS3 UserDemo" with M5Burner. Sensor can be seen in the I2C menu
3. Flash a program using I2C (E.g. the I2C_Tester.ino from the sample folder)
4. So far so good, it all works, we can get data from the SHT30 and the QMP6988 without any issue. Works on Port A and Port B.
5. Power off the device completely (Battery off, USB cable disconnected), the re-connect.
6. I2C doesn't work anymore (behavior is slightly different with the port: Port A times out and Port B just doesn't see any sensor, but none work)
7. The only way to get I2C back is to re-flash "CoreS3 UserDemo"

I2C does work as expected with UiFlow, so I assume the CoreS3 and the ENV-III aren't faulty.
I would think that I2C isn't properly initialized at startup...

The PIO console sometimes shows memory allocation error during startup (before setup() is invoked)

0:40:11.059 > ESP-ROM:esp32s3-20210327
20:40:11.059 > Build:Mar 27 2021
20:40:11.060 > rst:0xc (RTC_SW_CPU_RST),boot:0x2b (SPI_FAST_FLASH_BOOT)
20:40:11.060 > Saved PC:0x40377900
20:40:11.062 > SPIWP:0xee
20:40:11.062 > mode:DIO, clock div:1
20:40:11.064 > load:0x3fce3808,len:0x44c
20:40:11.066 > load:0x403c9700,len:0xbe4
20:40:11.068 > load:0x403cc700,len:0x2a68
20:40:11.090 > entry 0x403c98d4
20:40:11.245 > [   186][E][Wire.cpp:152] allocateWireBuffer(): Can't allocate memory for I2C_0 rxBuffer
20:40:11.247 > [   187][I][esp32-hal-i2c.c:75] i2cInit(): Initialising I2C Master: sda=2 scl=1 freq=100000
20:40:12.143 > [  1084][I][esp32-hal-psram.c:96] psramInit(): PSRAM enabled
20:40:12.160 > Initialize M5
20:40:13.660 > M5CoreS3 initializing...OK

If you are desperate to get it running, I have forked the micropython-m5stamp-c3u library and removed the QMP6988 reset().

Unfortunately I have not found a way to override the built-in libraries, so it needs some code blocks in UiFlow...

First install the libraries:

import mip
mip.install("https://raw.githubusercontent.com/AmedeeBulle/micropython-m5stamp-c3u/main/lib/sht30.py", target="/flash/libs")
mip.install("https://raw.githubusercontent.com/AmedeeBulle/micropython-m5stamp-c3u/main/lib/checksum.py", target="/flash/libs")
mip.install("https://raw.githubusercontent.com/AmedeeBulle/micropython-m5stamp-c3u/main/lib/qmp6988.py", target="/flash/libs")

Once done you can query both sensors -- e.g:

There are basically 3 code blocks:

Import libraries:

import sht30
import qmp6988

Initialize sensors:

sht = sht30.SHT30(i2c0)
qmp = qmp6988.QMP6988(i2c0)

Get data:

temperature, pressure = qmp.measure()
pressure = pressure / 100
temperature2, humidity = sht.measure()

Note that in the above example, my ENV-III is plugged in the Port B, if you use Port A, adjust SCL/SDA accordingly!

@mtylerjr I am not so sure about that...

Even with that change, the module will reset at this line...

What works for me is to bypass the reset(), after that I get correct temperature/pressure; but once you reset, the next readfrom_mem() will reset the MCU

Anybody got this working?

I am facing the same issue.

I tried to use Port B instead or port A, but the behavior is exactly the same: the device reboots when init is invoked...