This section describes how specific components operate on the AU335, and which audio formats are supported.
On-Board LEDs
The AU335 has a single red LED to indicate that the power is on. The LED will flash during the firmware update process. It will also flash a certain number of times to indicate an error state. The flash codes are described below:
| Flash Code | Description |
|---|---|
| 2 | Unspecified error |
| 3 | Network recovery script is preparing to run on a device configured for network recovery. |
| 4 | No upgrade file found |
| 5 | Failed to load kernel module |
| 6 | Board is not capable of running the current firmware version |
| 7 | A piece of onboard hardware is not working correctly |
| 8 | Problem related to the storage device (either the USB drive or microSD card) |
| 9 | Problem related to the registry/NAND |
| 10 | The autorun script encountered a load/run error |
| 12 | Unable to find a bootable image |
On-Board Switch
The on-board switch is connected to a GPIO pin that is pulled low when the service (SVC) button is pressed. Conversely, a pull-up on the button normally sets the GPIO pin to be pulled high.
Reset Switch/GPIO Button
The on-board switch is connected to the reset circuit. Pressing down the reset button will send an initial signal to the system software and holding the reset button low for approximately 4 seconds will cause a hard reset
microSD Slot
The AU335 has an external micro SD slot (SDHC and SDXC). SDHC storage is via SDXC (up to 2TB). It supports transfer modes up to UHS-1 DDR50 (50MB/s). There is no inherent limit on the storage capacity of microSD cards used with the player.
Supported Audio Formats
These are the audio formats that the AU335 supports:
