I have a hardware question about the dual use FS_DP / PA12 pin on the Pyboard-D STM32F722. When I connect the FS_DP/PA12 pin to 0V (GND) via a 10K pull-down resistor the Pyboard-D will not connect with my PC via the USB port. But remove the 10K pull-down resistor and the fault disappears. I am also using FS_DM / PA11 dual use port with the same circuit with no problem.
Does anyone know why FS_DP / PA12 when connected via a pull down resistor cause this connection problem?
thanks.