pendant interface and or MCU interface plugin

[jschoch]

playing with espnow for a pendant and wondering a few things....

1. is is best to just pass signals to the fpga, e.g. encoder pulses and button presses as digital logic?
2. is it better to send processed values, like the actual encoder position direction and count?
3. if 2, what is the best way to get this back into linuxcnc? I was looking at the i2c plugins, as well as uart but so far I'm only blinking leds with my noob verilog.
4. is it possible to have a generic mcu interface over i2c, SWD, SPI, Serial that can then pass through to linuxcnc pins/nets/signals?

#4 seems to have the most reuse potential

[jschoch]

an example... https://github.com/wezhunter/ESP32_LinuxCNC_Wireless_Client/issues

how would you do this via the FPGA?

[multigcs]

1/2: if the encoder is connected to the FPGA, then it is best to read it from the FPGA as well, i.e. not just to forward the individual pins, which is what the FPGA is best suited for

3: the I2C part is full of errors, better not to use, better is a UART or SPI

4: I am currently working on a UART bridge, which can then also be ported for SPI and other protocols.
but only on the new rewrite.

I think in the case of a wireless MPG, it is best to go directly into the host PC/RPI, without detours via the FPGA, you should also keep the interface between FPGA and host as small as possible, there everything must take less than 1ms