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Thanks for the code! All the buffers will be declared with EXTMEM and passed to the library. Then as stated in the first post, can they be accessed by DMA when sending to SPI, ideally without speed loss?

Oh yeah I had already read about it but forgot! Can you also confirm the first question?

Hi all! I have found various topics but I would like a definitive clarification on this: I have to draw to various SPI TFT diplays using the ILI9341_t3n library through DMA. So if I put the TFT buffers into EXTMEM (soldering both chips) will the library be able to access them automatically? The...

Oops I have found the problem, pin 3 was free but there were few lines of forgotten code that probably caused the strange behavior. I will check asap.

Thanks Paul, I tried with your code and the Teensy alone and on the resistor there are 130-140 mV, so it must be ok. I will try a simple sketch with the MCP to see what happens.

Hi Paul, thanks for the answer. Yes the MCP is correctly configured the same the Micro did with the interrupt pins as open-drain (and internally connected, so INTB triggers INTA) using the same code and the SPI decoder in the oscilloscope decodes the correct bytes. The power has been changed to...

Hi all! I have a project which started with an Arduino Micro and among various peripherals there is an MCP23S17. After some modifications I realized the Micro is too small and moved to a Teensy 4.1. Everything worked correctly except the MCP23S17 which seemed to be unresponsive. After checking...