Try swapping TX/RX.
Also I wonder why there are 3 UARTs on the encoder board..
Here it strongly suggests that Ambarella is at U0:
github.com
But here, none of the pads are described:
github.com
Maybe that was verified to be U0 only on P3X/P3S, and not on P3C?
Or maybe the chip doesn't show anything on UART before the bootloader from NAND?
Make sure you start the terminal first, and then enable power to the board.
Also I wonder why there are 3 UARTs on the encoder board..
Here it strongly suggests that Ambarella is at U0:
Firmware m0100
Tools for handling firmwares of DJI products, with focus on quadcopters. - o-gs/dji-firmware-tools
But here, none of the pads are described:
WM321 Camera encoder board
Tools for handling firmwares of DJI products, with focus on quadcopters. - o-gs/dji-firmware-tools
Maybe that was verified to be U0 only on P3X/P3S, and not on P3C?
Or maybe the chip doesn't show anything on UART before the bootloader from NAND?
Make sure you start the terminal first, and then enable power to the board.