[SOLVED]UART channel Serial1.begin(...) on HTCC-AB01

#1

Hi,
does the CubeCell-Board HTCC-AB01 have a second Serial-port besides TX1/RX1?
If so, which are it’s Pins?
Thanks in advance!

Edit (after some more research):
No second hardwareSerial available on AB01;
softwareSerials maximum baudrate seems to be 9600… :confused:

#2

You can set any value, but 9600 is the most stable.

#3

-> #include “softSerial.h” //(from TX_test.ino)

  • HelTec Automation™ CubeCell software serial example
  • Function summary:
    • date print example via software serial port;
    • baudrate defined in softwareSerial.begin(9600);
  • |-- Supported baudrate
  • |-- 14400 (Not statble)
  • |-- 9600
  • |-- 4800
  • |-- 2400
  • |-- 1200
  • HelTec AutoMation, Chengdu, China.

doesn’t work at 115200 baudrate.

-> #include <SoftwareSerial.h> //using the library from Arduino: https://www.arduino.cc/en/Tutorial/LibraryExamples/SoftwareSerialExample

doesn’t work with 115200 either.

#4

Git above the latest development environment, software serial port support to 57600. And all function formats and hardware serial port also support, such as serial.print serial.println serial.write

#5

Thanks for your effort Quency-D, but I don’t know how to “Git”…
I replaced my cores and libraries folders by those from https://github.com/HelTecAutomation/CubeCell-Arduino/

This is what i get left with:
In file included from sketch\2021_05_25_RX_test_AB02_Display_04.ino.cpp:1:0:

C:\Users*****\AppData\Local\Arduino15\packages\CubeCell\hardware\CubeCell\1.2.0\cores\asr650x/Arduino.h:33:19: fatal error: timer.h: No such file or directory

compilation terminated.

Update: I managed to make it compile by:
-copying all files from \hardware\CubeCell\1.2.0\cores\asr650x\lora\system
to \hardware\CubeCell\1.2.0\cores\asr650x\cores
-commenting l.23 of softSerial.cpp to //#if defined(asr650x)
#define GET_MCU_TIKER CY_SYS_SYST_CVR_REG
#define GET_MCU_RELOAD CY_SYS_SYST_RVR_REG
//#elif defined(asr6601)
//#define GET_MCU_TIKER SysTick->VAL
//#define GET_MCU_RELOAD SysTick->LOAD
//#endif

It does compile to the AB01 now - and actually sends stuff with apparently 57600baud. But i guess there’s still some issues with timing… I’ll probably stick to the files of 1.2.0 (loaded with ArduinoBoardLoader) and 9600baud for now.

#6

You can refer to this document:
https://heltec-automation-docs.readthedocs.io/en/latest/cubecell/quick_start.html#via-git

#7

:smiley: it is actually quite simple:
softSerial.h, l.16 -> void begin(uint32_t Baudrate); //instead of uint16_t
softSerial.cpp, l.29ff. -> void softSerial::begin(uint32_t Baudrate) //instead of uint16_t
{
switch(Baudrate)
{
case 115200:
timedelay = 6 ;
break;
case 14400:
timedelay = 69 ;
…

works fine for me (my UART RX is a AB02 that direct prints Serial1reads to the display)

case can be closed;