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@Gordon you have true this is no way. But I'm still have obsession by small PCB. My second attempt.
https://oshpark.com/shared_projects/S6astjvz
Edge header: i2c/uart (optional pull up), 2xDac,SD card, UART1 for bluetooth
Left edge only on tespoints signals for cc3000
Right wing nrf24l01
Battery, SWD,SCK, Reset on testpoins
Led on A0 PWM,
I think it should be compatible of espruino without changes.
I need now check for before ordering :)- adapter board with sdcard, bluetooth and maybe eeprom
- adapter board with sdcard, bluetooth and maybe eeprom
@bobricius I'm afraid I just don't have time to port Espruino for you - I've got to focus on things that are going to help bring in money I'm afraid :( It shouldn't be very difficult though as Espruino uses ST's API and most of jshardware.c should compile as-is. The most difficult part would be getting USB working, but you may be able to copy the code that already exists for the F1 or F4.