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    M5Stack Paper I2C Doesn't work

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    • felmueF
      felmue
      last edited by

      Hello @ispybadguys

      are you saying that simply calling M5.begin() in setup(), e.g.

      #include <M5EPD.h>
      void setup() {
        M5.begin();
      }
      
      void loop() {
      }
      

      produces M5EPD initializing...OK over and over again?

      Thanks
      Felix

      GPIO translation table M5Stack / M5Core2
      Information about various M5Stack products.
      Code examples

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      • felmueF
        felmue
        last edited by

        Hello @ispybadguys

        please find the I2C internal and all port scanner (which works for me) here.

        Thanks
        Felix

        GPIO translation table M5Stack / M5Core2
        Information about various M5Stack products.
        Code examples

        1 Reply Last reply Reply Quote 0
        • I
          ispybadguys
          last edited by

          Yes. I tested the very code you have here with just to include and M5.begin() and I get M5EPD initializing... followed by a 4 second pause and then the OK

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          • I
            ispybadguys
            last edited by

            Felix

            Thanks for the code . For scanning the I2C. The code produces the following output:

            M5EPD initializing...OK
            I2C Scan - internal
            .M5EPD initializing...OK
            I2C Scan - internal
            .M5EPD initializing...OK
            I2C Scan - internal
            .M5EPD initializing...OK

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            • felmueF
              felmue
              last edited by

              Hello @ispybadguys

              that is very weird - I am stumped.

              Have you tried to only scan the ports by commenting these two lines:

              //  Serial.println("I2C Scan - internal");
              //  scanI2C(i2cBus_Internal.wire, i2cBus_Internal.sda, i2cBus_Internal.scl);
              

              BTW: I also get a 4 seconds delay before OK is printed out - so that should be fine.

              Thanks
              Felix

              GPIO translation table M5Stack / M5Core2
              Information about various M5Stack products.
              Code examples

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              • I
                ispybadguys
                last edited by

                Felix

                Yes. I just tried that. I get the same behavior. I moved the script to a new Windows computer and installed the IDE there. I get
                13:10:21.290 -> I2C Scan - Port A
                13:10:21.290 -> .M5EPD initializing...OK
                13:10:25.790 -> I2C Scan - Port A

                I can actually scan the internal ports correctly if I don't call M5.begin(); and I just do a Serial.begin() and the wire commands.

                BTW the boards.txt has an error in it for the M5-Paper and you cannot upload code from the Arduino IDE. I fixed that and I can upload ok now.

                Kurt

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                • felmueF
                  felmue
                  last edited by

                  Hello @ispybadguys

                  the debug output suggests that as soon as the I2C port scan starts (first dot) your M5Paper seems to reboot.

                  • Have you tried a different / shorter USB cable? Maybe the issue is power related?
                  • Does the touch example (requires internal I2C) work?

                  Thanks
                  Felix

                  GPIO translation table M5Stack / M5Core2
                  Information about various M5Stack products.
                  Code examples

                  1 Reply Last reply Reply Quote 0
                  • I
                    ispybadguys
                    last edited by ispybadguys

                    Yes. That looks to be the case that it crashed after one or two Wire1 commands. Usually one period is printed but sometimes two. Also the internal I2C does not work is I call M5.begin but it does if I just call Wire.begin.

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                    • K
                      Koiru
                      last edited by

                      I'm having exactly the same issue. Have you figured out what causes it?

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                      • M
                        Morne
                        last edited by

                        @Koiru I have not found a solution but I have found a workaround.

                        The culprit creating the constant reboots are the touchscreen, if I call the begin function without enabling the touchscreen I can get the unit to work instead of doing constant reboots.

                        To initialize the unit without touchscreen, use the following arguments:

                        M5.begin(false, true, true, true, true);
                        
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