Still looking for a real product using I2C/SPI/PIO - this one is interesting DEFCON-32-Badge. But it looks like the source code is not shared on the github so we do not know if the actual code uses real SPI/I2C peripherals or bit-banging.
Though you would have to check the software to see if that is using actual on-chip peripherals or is bit-banging on the same pins as used by those peripherals in a manner which side-steps or mitigates the E9 issues.I looked into DEFCON-32-Badge schematic to see real (I believe) working product and I2C / SPI / UART seems to be unaffected by E9 issue (assumed all available RP2350 chips behave same way...).
Statistics: Posted by bgolab — Fri Sep 06, 2024 5:20 am