hardware spi
Some sources state that hardware SPI is only available on the following
SPI
MOSI
MISO
CLK
CS
SPI2
GPIO 35
GPIO 37
GPIO 36
GPIO 39
SPI3
GPIO 11
GPIO 13
GPIO 12
GPIO 10
Micropython REPL
If you are using micropython avoid GPIO 1 and 3.
These are connected to repl. You can't use these while connected to Micropython via USB, source only via webrepl
Micropython REPL
If you are using micropython avoid GPIO 1 and 3. These are connected to repl. You can't use these while connected to Micropython via USB, source only via webrepl