It would be an interesting project.

The esp32, ARM and PIC32s should have enough horsepower / memory to handle it.

The source is in C - so it should be possible to include 'as-is' (or nearly) and add an interface for Flowcode...

Martin

A simple (rather contrived) example. As Steve mentions - simulation is really not happening here. There are some advantages over switch statements (at least for lots of options) - the code is smaller and the options run in constant time. It also 'forces' the code to be split into multiple small macr...

Looks to be working well!

The code is nice and simple too

Martin

Please upload a flowchart that demonstrates this. It's hard to guess at the cause otherwise (pins not set?)

Martin

A little experimenting and a 20uS delay works well...

Here decoding the values returned by the slave...

I managed to get the slave to return data reliably - but only for one character at a time. If I attempt to do 2 bytes - the second value returned is the first value received. I've tried setting SPDR in main and in the interrupt handler. You are attempting to send 3 characters in the interrupt handle...

I think the slave needs to be interrupt driven to stand a chance of catching the data. So I wrote a small test program - that sets up and uses the SPI interrupt to receive data (on the Arduino). It's hardcoded to receive 3 bytes and output them to UART - I have an Arduino Nano firing off 3 character...

Can you also post the 'slave' code?

Martin

I made a small example based on above and Ben's code... esp32_pullup.fcfx It uses gpio_pullup_en and gpio_pullup_dis to toggle the pullup resistor on a pin (specified as 'Pin' in properties). So this generates a square wave with 50ms pulses (viewed on the oscilloscope). So - I wanted to be able to u...

See

https://docs.espressif.com/projects/esp ... /gpio.html

I think gpio_set_pull_mode and gpio_pullup_en should do what you are after.

I'll try and make a simple example when I get back to my pc later today.

Martin