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    Where can I find examples of using UART module in UIFlow?

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    • felmueF
      felmue
      last edited by felmue

      Hello @zhoubinx

      there is no need for that when using UIFlow2. UIFlow2 firmware automatically turns the power on for all ports. (The FAQ comment is only relevant when programming with Arduino.)

      What is the serial device you are trying to read from and write to? (I was testing with a SIM7080 modem, btw.)

      Thanks
      Felix

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

      Z 1 Reply Last reply Reply Quote 0
      • Z
        zhoubinx @felmue
        last edited by

        @felmue Understand! Thanks! I'm using a 3rd part device, not M5's product.

        1 Reply Last reply Reply Quote 0
        • felmueF
          felmue
          last edited by felmue

          Hello @zhoubinx

          please note: while Groove ports on M5Stack cores provide 5 V power, the data pins are only 3.3 V tolerant. Which means you might need some level shifters to make a third party product work.

          Do you have a link to that 3rd party product?

          Thanks
          Felix

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

          teastainT Z 3 Replies Last reply Reply Quote 0
          • teastainT
            teastain @felmue
            last edited by

            @felmue As a side note:
            I had a project where the third party sensor was 5V intolerant.
            I chose the Stamp-PICO with the USB Downloader accessory (and the Stamp-ISP) are 3.3V (!)

            Cheers, Terry!

            100% M5Stack addict with several drawers full of product!

            1 Reply Last reply Reply Quote 0
            • Z
              zhoubinx @felmue
              last edited by

              @felmue Thanks Felix! The device i'm working on is an Arduino 328P board, there were a UART port on the board (as far as the info i have, there printed "UART port", not I2C or whatever). It's a quite old device, it's difficult find link and more introduction. And it is the control board of an open source laser engraver machine.
              I will try your suggestion of the port voltage. And I also ordered a M5 UART GPS module, I will try that module to get more understanding of serials port programing first.

              1 Reply Last reply Reply Quote 0
              • Z
                zhoubinx @felmue
                last edited by

                @felmue I tested my target device the PIN is 3.3V, so, I need to downgrade M5 from 5V to 3.3V? Many thanks!

                robskiR 1 Reply Last reply Reply Quote 0
                • robskiR
                  robski @zhoubinx
                  last edited by

                  @zhoubinx M5 gpio/ grove are 3.3v so if your device side is 3.3 then all good, be sure that tx goes to rx and rx to tx, same baudrate and parity ....

                  M5StickC, M5StickCPlus, M5StickCplus2,M5GO, M5Core, M5Tough, M5Core2, M5 Demo Board, M5Dial, M5Paper, M5Atom, M5Cardputer, M5StampS3, CoreMP135, StamPLC, AirQ

                  1 Reply Last reply Reply Quote 1
                  • felmueF
                    felmue
                    last edited by felmue

                    Hello @zhoubinx

                    like @robski already mentioned, you only need level shifter if your target board TX and RX pins are different from M5Stack Groove port, which uses 3.3 V on its data pins. (Only the red wire of the Groove port, providing power to the M5Stack units, is 5 V.)

                    Are you sure your target board uses 3.3 V on the data pins? Arduino boards (especially old ones) mostly use 5 V on their data pins.

                    Thanks
                    Felix

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

                    1 Reply Last reply Reply Quote 0
                    • Z
                      zhoubinx
                      last edited by

                      0_1709551989520_da169cec-8dae-4fdb-8fd5-671dcf1aaaaa-image.png It looks like the bad thing is from AXP2101 power chip, all the PORTs were set to 5V? Please, any idea of how to lower voltage to 3.3V.
                      I will also find a multimeter to give a test.

                      robskiR 1 Reply Last reply Reply Quote 0
                      • felmueF
                        felmue
                        last edited by felmue

                        Hello @zhoubinx

                        I am not sure you fully understand the concept of how the Groove port of M5Stack devices are setup.

                        • Power (red wire) provides 5 V to M5Stack units (which if required turn the 5 V internally to 3.3 V using an DC/DC converter or LDO).
                        • Data lines (yellow and white wire) use 3.3 V
                        • GND (black wire)

                        In your case I assume the 3rd party device (Arduino) is already powered by its own power supply. If yes, then there is no need to use the power (red wire) of the M5Stack.

                        If the 3rd party device is using 3.3 V on its data lines (TX and RX) then the wiring is as follows:

                        M5Stack (3.3 V) TX <---> RX (3.3 V) of 3rd party device
                        M5Stack (3.3 V) RX <---> TX (3.3 V) of 3rd party device
                        M5Stack GND <---> GND of 3rd party device

                        If the 3rd party device is using 5 V on its data lines (Tx and RX) then the wiring is as follows:

                        M5Stack (3.3 V) TX <---> Level shifter <---> RX (5 V) of 3rd party device
                        M5Stack (3.3 V) RX <---> Level shifter <---> TX (5 V) of 3rd party device
                        M5Stack GND <---> GND of 3rd party device

                        Here is an example M5Stack unit which uses an DC/DC converter to lower the 5 V to 3.3 V and includes level shifters for the data lines. See schematic.

                        Thanks
                        Felix

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

                        1 Reply Last reply Reply Quote 0
                        • robskiR
                          robski @zhoubinx
                          last edited by

                          @zhoubinx said in Where can I find examples of using UART module in UIFlow?:

                          0_1709551989520_da169cec-8dae-4fdb-8fd5-671dcf1aaaaa-image.png It looks like the bad thing is from AXP2101 power chip, all the PORTs were set to 5V? Please, any idea of how to lower voltage to 3.3V.
                          I will also find a multimeter to give a test.

                          on your graphic USB-C is not PORT C (blue) - unfortunately it is drawn in blue - but this is USB port which you are connecting your Laptop /pc to M5Stack

                          in general on Ports A/B/C wires blk/red are power pins with gnd/5v on them where other two pins wht/yellow are data/sensor pins with 3.3v expected

                          M5StickC, M5StickCPlus, M5StickCplus2,M5GO, M5Core, M5Tough, M5Core2, M5 Demo Board, M5Dial, M5Paper, M5Atom, M5Cardputer, M5StampS3, CoreMP135, StamPLC, AirQ

                          1 Reply Last reply Reply Quote 0
                          • Z
                            zhoubinx
                            last edited by

                            Thanks all friends! I finally figure it out.
                            I think it is still related to AXP2101. When I keep the USB-C connected and use PORT C to communicate, it works. When plug off the USB-C, PORT C UART port just never send and receive data. I think it is because the USB-C supply power to the PORT C, not the inside battery. I will try to figure out how to let the battery to give power to PORT C.

                            1 Reply Last reply Reply Quote 0
                            • felmueF
                              felmue
                              last edited by

                              Hello @zhoubinx

                              I am glad to hear you got it working (at least with USB-C power).

                              BTW: My M5CoreS3 (running UIFlow2 firmware) provides power to all Groove ports (A/B/C) in both cases: running from USB-C or battery.

                              In your hardware setup, what do you need the 5 V of the Groove port for? If you have a multimeter it should be relatively easy to verify 5 V being present or not.

                              Thanks
                              Felix

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

                              1 Reply Last reply Reply Quote 0
                              • felmueF
                                felmue
                                last edited by

                                Hi guys

                                I've created an UIFlow2 example (M5CoreS3_Ext_Usb_Power_UIFlow2.0.1) showcasing switching ext. power output (Groove port) and USB power output. You can find it in the UIFlow2 Play Zone.

                                Thanks
                                Felix

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

                                1 Reply Last reply Reply Quote 0
                                • Z
                                  zhoubinx
                                  last edited by

                                  Thanks Felix! I will study your new example.

                                  1 Reply Last reply Reply Quote 0
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