Hello guys

the M5Cardputer doesn't have that hold button until green LED lights up mechanism. To put M5Cardputer into download mode use the method described here.

If you want to enter download mode, press and hold the G0 button on StampS3 before turning it on, then release it after powering it on.

Thanks
Felix

Hello @m5stack

thank you for letting us know about the latest UIFlow 1.7.3 firmware. I appreciate it.

It is however very unfortunate that the M5Core2 PaHub bug has not been addressed in this update. I'd appreciate if your engineers fix that bug in the next update.

Or, as stated already many times in many places, please open source the UIFlow code so we can help you fix issues like that.

Thank you for listening.

Felix

Hello @jamstooks

@ajb2k3 is correct, the PbHub is for analog devices only and cannot be used for UART.

Unlike UART, I2C is a bus and can handle multiple units (as long as the units use different I2C addresses). So if you want to connect multiple I2C units to you M5Core2 you can use a Groove-T.
However as soon as some units you wish to connect share the same I2C address you need a different solution. You have two options:

• the units in question allow for the I2C address to be modified
• use a PaHub (like @ajb2k3 suggested)

As for connecting the UnitV2 to your M5Core2 via UART: I would suggest the Battery Bottom 2, which has been designed for M5Core2 and it gives you the UART port needed.

The COMMU module should work as well, but as it has been designed for the M5Stack (Basic, Gray, Go, Fire) there seems to be some incompatibility issues like while the COMMU module is stacked to the M5Core2 the M5Core2 cannot be flashed.
(Note: I don't have the COMMU module, so I cannot confirm that issue.)

Thanks
Felix

Hi guys

an M5CoreInk with ESP32 in light or deep sleep still consumes a couple of mA (which is to be expected given the hardware architecture). However M5CoreInk allows to shutdown ESP32 completely and later wake it up from the RTC timer or alarm.

For an M5CoreInk in shutdown mode I've measured a current (at the battery) of only about 2.5 uA which is pretty good. And yes, the ink display retains the last image.

Cheers
Felix

Hi guys

Here is an explanation as to why it may take some time to fix: M5CoreS3 uses the SPI bus in a special way to control the LCD: MISO (normally an input) is reconfigured to be an output and is used as DC line (instead of a dedicated GPIO for DC). Unfortunately to access the SD card (which shares the SPI bus with the LCD) MISO needs to be an input.

In case you might be interested. I found a way to do this switching back and forth between input and output for Arduino.

Thanks
Felix

Hello @Bipman

by default Port A is meant for I2C, but it can be used for I/O (Port B) or UART (Port C) as well.

Note: But please be aware, that it can be only one type of port at any given time. Also, since its default use is Port A (I2C) there are internal pull-up resistors (10 k) in place on both lines which might have a negative effect when used in a different mode.

If you need Port A and Port B at the same time there is the PbHUB unit which can be used to connect some of the Port B units.

If you need all three types of ports (A, B and C) together then I am afraid M5Cardputer is the wrong device to use as core. There are simply no more GPIOs available for a dedicated Port B and/or Port C. Please see schematic here.

Thanks
Felix

Hello guys

my M5Cardputer takes about 7 hours for a full charge from a completely discharged battery state.

Note: I soldered two LEDs to the charger IC CHRG and STDBY outputs and it switched from charging to standby after about 7 hours.

Thanks
Felix

Hello @Surya

after long hours of searching and debugging I found the reason why I2C would fail. It starts to fail as soon as SSL is invoked. The SSL library uses an analog GPIO as input for its random seed. And in your code you used GPIO2 which is one of M5AtomS3 Groove GPIOs.

So to get rid of the I2C error try changing the GPIO used for random seed to GPIO10.

//SSLClient ethClientSSL(ethClient, TAs, (size_t)TAs_NUM, 2);
SSLClient ethClientSSL(ethClient, TAs, (size_t)TAs_NUM, GPIO_NUM_10);

Thanks
Felix

Hello @koreanEggCoffee

yes, that is possible - I am powering my M5Atom this way.

However please note: There is no protection against wrong polarity so please be careful not to accidentally swapping 5 volts and GND.

I also suggest you disconnect the external 5 volts before connecting USB-C. Or in other words only connect one power source at the same time.

Please also refer to the M5Atom schematics which outlines the 5 volts connections between USB, 5v pin, Groove, LEDs and 3.3 volts regulator.

https://docs.m5stack.com/#/en/core/atom_matrix

Cheers
Felix

Hello @tomtom22

G1 and G2 are available on Port A. You are correct, G38 and G39 are not available as general IO on the M5AtomS3. They are used for I2C (and yes. the IMU is already connected to them) but additional I2C devices can be added here. M5AtomS3 documentation can be found here.

Thanks
Felix

Hello @ScheduleDisplay

unfortunately that is not possible; all GPIOs (Port A, B and C) and the GPIO used for the side button go directly to ESP32 which is powered off in shutdown mode.

The only two options (I know of) to wakeup M5Paper from shutdown mode are:

• long press of side button
• RTC alarm

Thanks
Felix

Hello @Krmiller

I am not able to reproduce the issue you are describing. Tested with Linux and MacOS client. That said I recommend not using delay() in the loop as it blocks the WiFi background process.

Try replacing loop with below code. (You should see a much quicker response too.)

void loop() {
  static uint32_t t = millis();

  if(millis() > t + 5000)
  {
    t = millis();
    int clientCount = WiFi.softAPgetStationNum();
    Serial.print("Connected clients: ");
    Serial.println(clientCount);
  }
}

Thanks
Felix

Hello @Pajdzian

I measure about 62 mA charging current (at the battery) when using M5Launcher and the same amount when running Cardputer UIFlow2 or Demo firmware (the one preloaded).

So I am curious: what other firmware did give you a slower charging rate?

Thanks
Felix

Hello @sqbaczek

unfortunately I don't have the proper hardware, e.g. TOF4m unit, so I cannot test this myself. Sorry.

BTW: are you aware that in UIFlow1 you use PaHUB channel 0 and 2 and in UIFlow2 you setup PaHUB channel 0 and 1.

Thanks
Felix

Hello @sqbaczek

assuming the programming is correct my best guess would be that the two ToF4m influence each other due to the signal they both send out. Maybe the signal of one gets reflected from the walls and then is picked up by both (and vice versa)?

BTW: have you tried the UIFlow2 instead? Do you get the same results?

Thanks
Felix

Hello @cryptospok

please find an example in the UIFlow2 Project Zone: M5ToughTouchTest_UIFlow2.1.7 showing how to get rid of old / duplicate touch events.

Thanks
Felix

Hello @mtrehy

have you tried to connect only one of the two (M5Scale or Led Bar) to your M5Atom and see if you can make one work at the time?

Thanks
Felix

Hello @r0kh0rd

I think it has been fixed by M5Stack. Check out this example - works for me.

BTW: my example does not work anymore as M5.Lcd.getSPIinstance() no longer exists in M5CoreS3 library.

Thanks
Felix

Hello @r0kh0rd

I am not sure it is still valid, but last year I encountered a similar issue when trying to use the LCD and the SD card together with an M5CoreS3.

Maybe the solution I found at the time might be helpful for your situation as well.

Note: I cannot test this myself as I lack the necessary hardware, e.g. I do not have a LoRa868 v1.1.

Thanks
Felix

Hello @soujiro0725

please find an example here.

Thanks
Felix