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

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    • Z
      zhoubinx
      last edited by

      0_1709268742294_屏幕截图 2024-03-01 125204.jpg
      I did nothing, only init a UART module. When i select UART 0, it throws out an error "ValueError: UART buffer size is fixed". When I select UART 1 or 2, it throws out an error "invalid pin"....
      There were too insufficient documents!

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

        understand, i can see same, UART implementation looks different in Uiflow 1 blockly and it works.

        uiflow1
        uart1 = machine.UART(1, tx=17, rx=16)
        uart1.init(9600, bits=8, parity=None, stop=1)

        uiflow2
        setup block:
        uart0.init(baudrate=115200, bits=8, parity=None, stop=1, tx=17, rx=16, rts=-1, cts=-1, txbuf=256, rxbuf=256, timeout=0, timeout_char=0, invert=0, flow=0)

        init block:
        uart0 = UART(0, baudrate=115200, bits=8, parity=None, stop=1, tx=17, rx=16, rts=-1, cts=-1, txbuf=256, rxbuf=256, timeout=0, timeout_char=0, invert=0, flow=0)

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

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        • felmueF
          felmue
          last edited by felmue

          Hello @zhoubinx

          in UIFlow2 the UART blocks, unfortunately, are broken (for M5CoreS3 at least). Using UART1 tries to initialize rts and cts with -1 which leads to the "invalid pin" error.

          @m5stack : please fix. Thank you.

          But there is a way to get around that error using the Execute mpy code block and omitting the extended parameters like rts etc.. I've uploaded an example into the UIFlow2 Play Zone called: M5CoreS3_UART_PortC_UIFlow2.0.1

          Thanks
          Felix

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

          Z 2 Replies 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?:

            I didn't find any examples in Github either

            @zhoubinx for some examples go to uiflow1 flow.m5stack.com then under UART blocks you can find pass thru and sim800 examples

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

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

              @felmue Thanks alot! I will study your example!

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

                @robski Thanks alot robski! Thanks for your clue about uiflow 1, so I tried to code in mpy, “from machine import UART”. At least, it no longer crashes, but still can't read and write data, I will keep on trying and let everyone know.

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

                  @felmue I studied your example. Can I know what device you used to connect to S3 through the UART port(port C of the S3 core)? On my side it still doesn't work, can't read anything neither write out. I noticed in the introduction of S3, there is an official note:"Q: After the sensor is connected, what is the case that the sensor does not work or does not exist?
                  A: The CoreS3 uses the AXP2101 power management chip, and the Port port and the M5-Bus power supply need to be configured for normal output voltage. The configured API is in the AXP2101.cpp library file, and can be configured as required. eg: M5.Axp.powerModeSet(POWER_MODE_USB_OUT_BUS_OUT) in the setup function."

                  0_1709368399107_屏幕截图 2024-03-02 163224.jpg

                  Would that be the reason? How can I do that in mpy? In your mpy and C project, you never use this powerModeSet function.

                  Many thanks again!

                  1 Reply Last reply Reply Quote 0
                  • 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

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