ESP32 Support about arduinomodbusslave

[yaacov]

Thank you for the issue

[tinkering4fun]

Update: I try to re-sort my fork into different branches ...

• issue98: is the fix where this issue is about.

The rest goes way beyond this ...

• kernel: A class which already provides some which I would expect from any of my workable slaves.
  The idea is to have a consistent set of kernel functionality and code the dedicated application functions in a derived class.

• kernel-examples: Examples using the above concept.

• allnew: Merging all of the above

• EP32: Will finally only contain the addition in library.properties file. ESP32 architecture is currently not listed, but the library seems to work.

[Erfan12699]

hi Werner
thanks for good issue.
please tag simpleESP32.ino.
text is not correct to open.

[tinkering4fun]

Hi Erfan, sorry for not exactly understanding your message ...
Do you have issues when trying to open attached simpleESP32.ino.txt ?
Of course it needs to be renamed after download. I took the .txt naming by intention to get only a quick preview in text editor when clicking on it (avoid immediate start of Arduino IDE). As mentioned, I'm still a Github newbie ...

btw: In the meantime I re-organized my fork https://github.com/tinkering4fun/ArduinoModbusSlave-ESP32-fork
See branch 'specific-examples' and example 'plainSlave'

ArduinoModbusSlave-ESP32-fork/examples/specific/ESP32/plainSlave

[Erfan12699]

thanks dear Werner

I want to put an ESP32 module as a slave by Yaacov's library (Modbusslave.h) and read the analog data by Modbus pull in my pc.

can you help me?

[Erfan12699]

dear Werner.
Does this library (Modbusslave.h) work on STM32 (bule pill)?

[tinkering4fun]

Hi Erfan,
i guess my mentioned example ArduinoModbusSlave-ESP32-fork/examples/specific/ESP32/plainSlave
does exactly what you asked for ...?

See line 445
slave->writeRegisterToBuffer(i, analogRead(adc_pins[address + i]));

I assume you are already familiar with Modbus and have some Modbus client software at your PC-
If so, just use FC04 to read the input registers 0 and 1, which will return the values from pins ADC_0 and ADC_1.

There is also a straight-forward and simple example in Yaacov's lib
ArduinoModbusSlave/examples/simple

It is made for Arduino board, but the code should also run on ESP32 after changing the ADC pin definitions.
Just 150 lines of code, so it should be a good starter.

I never used STM32, if you own one, just give it a try and see ...

btw:
If you never used Modbus before, it may be too complex to learn for just just pulling ADC values into an PC.
Sorry, but I will not guide you to a final Modbus end to end solution for your specific problem.

Hope this helped to some extend.

Regards
Werner

[Erfan12699]

Thanks dear Werner.

yes, i used Yaacov's lib and read analog on Modbus pull.

i could use from Yaakov's library on ESP32 with your guide. very good issue.

thank you and dear Dr zemir

Regards
Erfan