4DISCOVERY-50W datasheet(13/43 Pages) 4DSYSTEMS

13 / 43 page

Wall Mountable Display Solution

4Discovery-50

Page 13 of 43

www.4dsystems.com.au

The micro-SD card can be used as an update medium

for the 4Discovery, in conjunction with suitable

application code being written. The microSD card can

be mounted and used to update the application(s)

stored on the onboard Flash of Diablo16. This is

useful to roll out updates without having to

reprogram the 4Discovery. This however is not able

to update the PmmC/Firmware or Display Driver.

These must still be updated via the RS485

Programmer on Standard 4Discovery Configurations

(DB01), via the Serial UART on the Secondary

Configuration (DB02) or over the network with

suitable Host code.

The 4Discovery features a Card Detect on the

microSD socket, which can be utilised by the User in

their application, to determine if a microSD card is

inserted or not. This could be used to switch in and

out graphics which may rely on uSD card, or a

simplified backup graphic which may be stored on

Flash, for example.

GPIO PA11 – SD Card Detect

PA11 is Active High when a card is detected, and Low

when no card is detected.

Note: Read disturb is a well-known issue with flash

memory devices, such as microSD cards, where

reading data from a flash cell can cause the nearby

cells in the same memory block to change over time.

This issue can be prevented by using industrial-grade

microSD

cards

with

read

disturb

protection.

Industrial-grade microSD cards have a firmware that

actively monitors the read operation and refreshes

areas of memory which have high traffic and even

move data around to prevent read disturb error from

occurring. Furthermore, manufacturers may choose

to implement read disturb protection on a specific

part of the flash memory only, such that the

beginning part of the memory might not be

protected. The RMPET utility in Workshop4 is

designed to create the first partition at an offset

from the start of the microSD card to account for this

situation. It is therefore recommended to always

partition and format an industrial microSD card using

the RMPET utility before using it with 4D Systems

processors.

7.3. FAT16

The 4Discovery Module uses off the shelf standard

SDHC/SD/micro-SD memory cards with up to 4GB

capacity usable with FAT16 formatting. For any FAT

file related operations, before the memory card can

be used it must first be formatted with FAT16 option.

The formatting of the card can be done on any PC

system with a card reader. Select the appropriate

drive and choose the FAT16 (or just FAT in some

systems) option when formatting. The card is now

ready to be used in the DIABLO16 based application.

The DIABLO16 Processor also supports high capacity

HC memory cards (4GB and above). The available

capacity of SD-HC cards varies according to the way

the card is partitioned and the commands used to

access it.

A Max of 4GB can be utilised by the FAT16 file

system. The FAT partition is always first (if it exists).

Any space larger than 4GB will be RAW, and can still

be utilised by your 4D Systems module, using

different functions. Please refer to Application Notes.

Partitioning of microSD cards should be carried out

using the RMPET tool, which is included with the

Workshop4 IDE. This tool enables you to partition

and format your microSD card in a range of ways. It

also then allows you to format the card so it is ready

for the 4Discovery.

7.4. Piezo Buzzer

The 4Discovery has an on-board Piezo buzzer, which

enables feedback to the user for a range of

situations, such as when the screen is touched, or if

an event occurs that needs an audio alert.

The Piezo buzzer uses the AUDIO pin on the Diablo16

processor,

and

can

be controlled

using

the

snd_Freq() function. The optimal frequency to use for

this buzzer is 2731Hz.

Please refer to the DIABLO16 Internal 4DGL Functions

document for more information on this function,

available from the 4Discovery Product Page, on the

4D Systems website. www.4dsystems.com.au

7.5. WiFi and Bluetooth (Optional)

The 4Discovery 5.0” module optionally features both

WiFi and Bluetooth connectivity, utilising the

Espressif ESP32-PICO-D4 SoC (System on Chip).

The 4Discovery features both an internal antenna,

and facilities for an external u.FL style antenna to be

connected. This allows flexibility if the 4Discovery is

mounted in an enclosure or if WiFi reception is some

distance away.

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