I am also trying to get RFID 2 to work with PaHub and running into similar problems:

1. How to work with I2C device that requires initiation ahead of time. In this case, it is

MFRC522 mfrc522(0x28);

2. Why 0x28 show up in CH0 readout while RFID 2 is plugged into CH1 on PaHub.

You mentioned to get an update version of ClosedCub.cpp? I don't have the directory in my library folder, could you please be more specific. (I also googled it but out of luck there as well).

Thanks,

I’m experiencing a similar issue with channel 0 on my PCA9548AP while using 6 Weight I2C Units.

When a Weight Unit is connected to channel 0, no response is detected.
However, when connected to any other channel, the device address is shown correctly.

Were you able to find a solution for this issue? I haven’t been able to resolve it yet and would appreciate any insights.

Thanks in advance!

@felmue In Dutch : Krijg nou wat?
I put the RFID 2 module in slot 1 of the TCA 9548A module and then in channel 0 (weird because i have placed it in channel 1) i see address 0x28 of the RFID popping up.

Does this mean that channel 0 on the module is not usable?
Thanks

In follow_up , I have checked ClosedCube_TCA9548A.cpp and the selctChannel goes like this :

uint8_t ClosedCube::Wired::TCA9548A::selectChannel(uint8_t channel) {
    uint8_t result = 0xff;
    if (channel < TCA9548A_MAX_CHANNELS) {
        Wire.beginTransmission(_address);
        Wire.write(((uint8_t)1) << (channel));

        _currentChannel = channel;
        result          = Wire.endTransmission();
    }
    return result;
}

That seems to be correct if I read the documentation of the Texas Instrument module TCA9548A

I am really misunderstaning something or could it be that their is somekind of wire mixup in the module?

Btw, I also dont see a reset channel somewhere in the code.

Now i did another experiment using PCA9548AP (the newer version).
Plugging in the RFID in channel 0 gives no response.
Plugging in channel 1 : software tels me the device is in channel 0
Plugging in a second RFID in channel 2 :software tells met a I have another device in channel 1.

I tried to increase the max number of channels to 8 (assuming that channel 0 is somehow connected to channel 7 of 8). Still no response when i attach a device physically on channel 0.

This is really weird behaviour. I hope someone is at least able to reproduce this behaviour.

have you tried to connect the RFID2 to another channel than 0? Does it show up then?

Do you have other I2C units which you could connect to any channel just to see if they get picked up?

For a scan an I2C device doesn't need to be initialized.

Thanks
Felix

#include "ClosedCube_TCA9548A.h"

#define FRONT 2

#define X_LOCAL 100
#define Y_LOCAL 35
#define X_OFFSET 160
#define Y_OFFSET 34

#define PaHub_I2C_ADDRESS 0x70

ClosedCube::Wired::TCA9548A tca9548a;

void setup() {
M5.begin();
Wire.begin();
tca9548a.address(PaHub_I2C_ADDRESS); // Set the I2C address. 设置I2C地址
M5.Lcd.setTextFont(4);
M5.Lcd.setCursor(70, 0, 4);
M5.Lcd.setTextColor(YELLOW, TFT_BLACK);
M5.Lcd.println(("PaHUB Example"));
M5.Lcd.setTextColor(TFT_WHITE, TFT_BLACK);
}

void loop() {
uint8_t returnCode = 0;
uint8_t address;
for (uint8_t channel = 0; channel < TCA9548A_MAX_CHANNELS; channel++) {
M5.Lcd.setCursor(X_LOCAL, Y_LOCAL + Y_OFFSET * channel, FRONT);
M5.Lcd.printf(
" ");
M5.Lcd.setCursor(X_LOCAL, Y_LOCAL + Y_OFFSET * channel, FRONT);
M5.Lcd.printf("CH%d : ", channel);
returnCode = tca9548a.selectChannel(channel);
if (returnCode == 0) {
for (address = 0x01; address < 0x7F; address++) {
Wire.beginTransmission(address);
returnCode = Wire.endTransmission();
if (returnCode == 0) {
Serial.print("I2C device = ");
M5.Lcd.printf("0X%X ", address);
}
}
}
delay(200);
}
}

the code works for me using M5Core2v1.1 and the following modifications:

//#include <M5Core2.h>   <-- replace this with below lines
#include <M5Unified.h>
#include <Wire.h>

    M5.begin();
    Wire.begin();  <--- add this after above line

Thanks
Felix