Matrix-orbital GLK24064-16-1U Manual de usuario descargar pdf (Pagina 36)

File Upload Protocol

Once a bitmap or font file has been created and paired to its command it must be sent using a file

protocol developed specifically for Matrix Orbital displays. Once a file upload command has been sent

requesting a unique reference number and specifying the file size required, the display will respond

indicating whether it has enough room to save the file or not. As is the case throughout the upload

protocol, a response of 1 will indicate confirmation while an 8 corresponds to rejection and will

terminate the session.

Table 29: Upload Protocol Responses

Value

Action

Description

Confirm

Transfer successful, upload continues

Decline

Transfer failed, abort upload

Once a file is confirmed to fit within the display, the upload will begin. A protocol is used here to ensure

each byte is uploaded successfully. After each byte is sent, the module will echo it back to the host. It

should then be checked against the value originally sent before a confirmation byte of 1 is returned. If

the transmitted and echoed values do not match the upload should be aborted by sending a value of 8

instead. The upload will continue in this manner as indicated by the examples below which utilize

familiar font and bitmap files.

Table 30: Font Upload Protocol

Host

Display

Comments

254

Command Prefix

Upload Font File Command

Reference ID

Font File LSB

Font File MSB

Size Confirmation

First Font Data Byte

Echo Data Byte

Confirm Data Byte

...

Last Font Data Byte

Echo Data Byte

Confirm Data Byte

Table 31: Bitmap Upload Protocol

Host

Display

Comments

254

Command Prefix

Upload Bitmap File Command

Reference ID

Bitmap File LSB

Bitmap File MSB

Size Confirmation

First Bitmap Data Byte

Echo Data Byte

Confirm Data Byte

...

224

Last Bitmap Data Byte

224

Echo Data Byte

Confirm Data Byte

It should be noted that the display has a timeout setting of 2.1 seconds before it resets to prevent it

from hanging during the upload process. Upon reset, the values 254 and 212 will be returned to

indicate an error or lengthy delay has occurred in the upload process. If everything goes smoothly, the

protocol will end with the host transmitting a final confirmation byte and the font will be stored in the

display ready for any application.

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