I am able to successfully send strings and numbers between two STM32F407VG Discovery boards and between two Arduino Uno boards but I am unable to do it between an STM32F4 and an Arduino Uno.
Here is what I did:
- Arduino Uno RX --> PA2
- Arduino Uno TX --> PA3
- A pin from the STM32F4 ground to the arduino ground.
I use the default configuration 9600 baudrate, 8 bit data size, 1 stop bit and no parity. Output type of the gpios on the stm32f4 is push pull and they are pulled up.
Is there something I am missing?