This section describes how specific components operate on the AU335, and which audio formats are supported.the XC2055 and XC4055
On-Board LEDs
The four on-board LEDs have the following indicators:
| LED | Indication |
|---|---|
| Green power (Pwr) |
| Displays when the board is powered up and not in reset mode. Flashes during firmware update process. | |
| Green file-system activity (Bsy) | Flashes any time there is file-system activity (on any storage device) |
| Blue (WiFi) | Flashes when the board is being upgraded. |
| Red status (Err) | Flashes a certain number of times to indicate |
which error |
is occurring. The flash codes are described below: |
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On-Board Switch / SVC Button
The on-board switch is connected to the GPIO02, which is pulled low when the service (SVC) button can be used for a number of debugging tasks. When it is pressed, a GPIO pin is pulled low, and when it is released it . Conversely, a pull-up on the button normally sets the GPIO pin GPIO02 to be pulled high.
Reset Switch / GPIO Button
The reset button 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 four 4 seconds will cause a hard reset.
MicroSD Slot
The AU335 XC2055 and XC4055 have one microSD MicroSD slot, which supports transfer modes up to UHS-1 DDR50 (50MB50MBytes/ssecond). There There is no inherent limit on the storage capacity of microSD MicroSD cards used with the player. .
Wireless Module
The XC2055 and XC4055 both have a dual antenna connection. This allows users to install a compatible wireless module without disassembling the unit. This connection has a Bluetooth option.