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• Lessons and Guides

  Lessons and Guides for Uiflow

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  E

  Hello everyone,
  I’m facing a problem that I haven’t been able to solve.
  I have connected four servo motors to pins G19, G25, G26, and G27 of the Core2, and using UIFlow1 I can correctly control the servos’ movements.

  Now, I need to establish USB communication between my PC and the Core2. Essentially, I would like to run a Python script on my PC that sends an angle to the Core2 so it can command the motors to reach that desired value. I want to understand whether the USB cable connecting the Core2 to the PC is sufficient (I’ve asked on chat.m5stack.com and it should be possible according to AI response).

  I’ve tried many approaches, all unsuccessful. Here are the two main ones:

  Attempt 1: In UIFlow1 I used the Hardware -> UART blocks, defining both uart1 = machine.UART(1, tx=32, rx=33) and uart2 = machine.UART(2, tx=17, rx=16). In both cases, I cannot read anything (uart1.any() / uart2.any() return nothing).

  Attempt 2: I flashed the UIFlow2 firmware, but I cannot find blocks for serial communication.

  It seems I could also bypass UIFlow entirely and program everything in VS Code using the Python and Pymakr extensions, but I would like to know if this is the only way before going that way.

  Thanks a lot for your support!
  Eleonora

• Bug Report
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  Topics
  787
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  K

  i building a universal custom tools, and for no reason, i hace this error.
  i have a dev vision for avoid all the syntaxe problem, and the other problem, but it the first time i meet this problem; i working with uiflow2.3.9 web connected to the tab5 in serial

  here the error:

  MPY version : v1.25.0-dirty on 2025-12-05
  IDF version : v5.4.2-dirty
  Machine : M5STACK Tab5 with ESP32P4

  Guru Meditation Error: Core 1 panic'ed (Load access fault). Exception was unhandled.

  Core 1 register dump:
  MEPC : 0x480d1f46 RA : 0x480d1efe SP : 0x4ff3a3e0 GP : 0x4ff1ae00
  TP : 0x4ff3a8d0 T0 : 0x4fc1a058 T1 : 0x4ff158d6 T2 : 0x4887d850
  S0/FP : 0x4ff3a410 S1 : 0x4887f34c A0 : 0x00000058 A1 : 0x4833c97c
  A2 : 0x00000004 A3 : 0x4887d830 A4 : 0x4887f290 A5 : 0x00000009
  A6 : 0x00000002 A7 : 0x0000003f S2 : 0x485ce770 S3 : 0x00000000
  S4 : 0x4887f348 S5 : 0x4865be0c S6 : 0x00000068 S7 : 0x4ff21000
  S8 : 0x4865bfcb S9 : 0x4887f314 S10 : 0x4865bfba S11 : 0x4865bfca
  T3 : 0x48862a44 T4 : 0x00000002 T5 : 0x00001f44 T6 : 0x00009caa
  MSTATUS : 0x00011880 MTVEC : 0x4ff00003 MCAUSE : 0x00000005 MTVAL : 0x00000009
  MHARTID : 0x00000001

  Stack memory:
  4ff3a3e0: 0x485ce770 0x4887f34c 0x4887f290 0x4887f350 0x485ce770 0x4887f350 0x00000004 0x00000004
  4ff3a400: 0x00000068 0x4865be0c 0x4ff3a440 0x480d0602 0x00008502 0x4887f314 0x4887f290 0x4887f350
  4ff3a420: 0x4887f290 0x00000004 0x00000009 0x4887f350 0x4ff3a474 0x4887f34c 0x4ff3a470 0x4802d540
  4ff3a440: 0x000010a0 0x480d05aa 0x4887f318 0x00000002 0x00000002 0x00000002 0x4887f290 0x4887f350
  4ff3a460: 0x4886bfd0 0x000010a0 0x4ff3a4a0 0x48012612 0x4887f318 0x00000000 0x00000002 0x482dddbc
  4ff3a480: 0x000010a0 0x4887d850 0x4887f314 0x482dddbc 0x485ce770 0x4887f34c 0x4887f300 0x4ff05f5e
  4ff3a4a0: 0x4fc1a048 0x481c40d6 0x0000047c 0x00000000 0x4ff3a8d0 0x4887f340 0x00000020 0x4887e380
  4ff3a4c0: 0x4ff3a620 0x00000006 0x4ff058fc 0x4887f300 0x4887f34c 0x00000003 0x00000006 0x4887f348
  4ff3a4e0: 0x0000000e 0x00000068 0x4ff21000 0x0000004c 0x48866834 0x48885e79 0x48885eb9 0x4ff3a4a0
  4ff3a500: 0x481c3eda 0x481c3e8a 0x4ff3a580 0x48885eb9 0x48885e79 0x48866834 0x0000004c 0x00000038
  4ff3a520: 0x4887f300 0x0000000e 0x4887e540 0x00000006 0x00000003 0x4886be70 0x4ff3a570 0x481878dc
  4ff3a540: 0x000007d1 0x00000003 0x48885eba 0x4ff21000 0x00000068 0x4887e540 0x4887d874 0x00000038
  4ff3a560: 0x00000006 0x00000002 0x4886bf50 0x481c9aea 0x00000068 0x00000004 0x00000000 0x481c3e8a
  4ff3a580: 0x00000001 0x4ff3a5c4 0x4886683c 0x00000006 0x00000001 0x4887d870 0x4886683c 0x00000006
  4ff3a5a0: 0x00000001 0x4887d850 0x0000003c 0x4818f064 0x4ff21758 0x48886000 0x48866890 0x482ddf30
  4ff3a5c0: 0x48885e79 0x4886bf50 0x4887d850 0x4887d850 0x00000011 0x00000000 0x4ff3a5c4 0x00000000
  4ff3a5e0: 0x00000068 0x48886000 0x48866890 0x00000000 0x485ce770 0x48866894 0x48866820 0x4ff05f5e
  4ff3a600: 0x48863620 0x7f000000 0x00000949 0x00000000 0x00000002 0x48866888 0x00000020 0x48863620
  4ff3a620: 0x4ff3a6f0 0x48886000 0x4ff058fc 0x48866820 0x48866894 0x00000000 0x00000000 0x48866890
  4ff3a640: 0x00000018 0x00000068 0x4ff21000 0x00000074 0x48863fc8 0x488846cc 0x488846d5 0x4ff3a600
  4ff3a660: 0x48884c90 0x48863620 0x00000010 0x488846d5 0x488846cc 0x48863fc8 0x00000074 0x00000060
  4ff3a680: 0x48866820 0x00000018 0x48863fcc 0x00000000 0x00000000 0x4ff21758 0x4ff3a6d0 0x481878dc
  4ff3a6a0: 0x00000068 0x48886000 0x488846d6 0x4ff21000 0x00000068 0x48886000 0x48863fe4 0x00000000
  4ff3a6c0: 0x485ce770 0x48863fe8 0x48863fb0 0x4ff06016 0x00000000 0x4867b3c4 0x48864290 0x00000000
  4ff3a6e0: 0x00000000 0x48863fe8 0x0000001f 0x481bcaaa 0x4ff3a7c0 0xffffffff 0x4ff058fc 0x48863fb0
  4ff3a700: 0x48863fe8 0x00000000 0x00000000 0x48863fe4 0x00000009 0x00000068 0x4ff21000 0x0000005c
  4ff3a720: 0x0000000d 0x48391000 0x48362000 0x4ff3a6d0 0x488844b0 0x48863620 0x00000010 0x48362000
  4ff3a740: 0x48391000 0x0000000d 0x0000005c 0x00000048 0x48863fb0 0x00000009 0x00000000 0x00000000
  4ff3a760: 0x00000000 0x4ff21758 0x4ff3a7a0 0x481878dc 0x488844b0 0x0000000d 0x48391000 0x48391000
  4ff3a780: 0x48391000 0x48362000 0x00000005 0x00000002 0x00000001 0x48863700 0x00000016 0x481d26e2
  4ff3a7a0: 0x00000000 0x4ff219d0 0x4ff21984 0x4ff11e92 0x00000000 0x00000001 0x48880394 0x00000000
  4ff3a7c0: 0x00000000 0x00000000 0x481d268c 0x00000016 0x4ff3a820 0x00000001 0x00000002 0x00000005

  ELF file SHA256: 5f70ef1bd

  Rebooting...
  ESP-ROM:esp32p4-eco2-20240710
  Build:Jul 10 2024
  rst:0xc (SW_CPU_RESET),boot:0x20c (SPI_FAST_FLASH_BOOT)
  Core0 Saved PC:0x4ff0ad14
  Core1 Saved PC:0x4ff01060
  SPI mode:DIO, clock div:1
  load:0x4ff33ce0,len:0xd04
  load:0x4ff2abd0,len:0xab4
  load:0x4ff2cbd0,len:0x2f94
  entry 0x4ff2abd0
  sdio_mempool_create free:26797616 min-free:26797616 lfb-def:26214400 lfb-8bit:26214400

• Custom Blocks
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  Topics
  33
  Posts

  A

  @jeanfabre
  On web, just choice block type.
  86b7a25c93207d9a32e5b33471bb1f0.png

  For code, add return description like this:
  def func(self) -> int:
  return 0