HO523 Theory of Operation

 

This section describes how specific components operate on the HO523.

On-Board LEDs

There are four on-board LEDs that indicate the following:

LED

Indication

LED

Indication

Green file-system activity (Bsy)

Flashes any time there is file-system activity (on any storage device)

Green power (Pwr)

Displays when the board is powered up and not in reset mode. Flashes during firmware update process.

Blue WiFi ()

Flashes when the player is connecting to the wireless network. Displays when connected.

Red status (Err)

Flashes a certain number of times to indicate which error is occurring. The flash codes are described below.

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 on-board 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.

11

WiFi-related error

12

Unable to find a bootable image.

On-Board Switch

The on-board switch is connected to the GPIO12, which is pulled low when the service (SVC) button is pressed. Conversely, a pull-up on the button normally sets the GPIO12 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 HO523 has one microSD slot, which 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.

Wireless Module

The HO523 has an internal M.2 slot for installing a compatible wireless module. The M.2 wireless module connects via cable to a single external, attachable wireless antenna.