GLT240128-FGW-VPT (Matrix Orbital) Datasheet资料下载 PDF(52/72 页)

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参数资料

型号：	GLT240128-FGW-VPT
厂商：	Matrix Orbital
文件页数：	52/72页
文件大小：	2630K
描述：	LCD TOUCH 128X240 WHT/GRY
应用说明：	GLT240128 AppNote
产品变化通告：	12C Displays Change 11/Oct/2011 GLT24064(R)-(1U), GLT240128 v8.3 Release 11/Oct/2011
标准包装：	1
系列：	GLT

Command Summary

XModem Transfer

Protocol

In addition to its original simple upload format, Matrix Orbital has added an XModem based protocol.

This facilitates much faster download speeds by increasing the packet size from 1 byte to 128 bytes and

using only a two byte CRC for error checking, greatly increasing throughput. To begin the upload, a

series of command bytes are sent, a list of valid file type bytes is show in the File Types

table. Once the

command bytes are sent, the true size of the file is sent in four bytes, least significant byte first. At this

point the display will respond

with a C if the file fits or a NAK otherwise. Please note that these values

are different than those of the original protocol as seen in the XModem Message Bytes

table. If a NAK is

seen at any point by the host, the upload is to be aborted in the same fashion as the regular protocol. If

the file will fit, the start of header byte will be sent by the host, followed by a block count, in regular and

inverted format, representing the number of 128 byte blocks remaining to be sent. The display will then

check to make sure the block count value matches its own, if it doesn’t it will NAK. The host can then

send a 128 byte block of data followed by that blocks high and low

CRC16 bytes. The display then

performs a CRC check on the data receive and ACKs if it matches that which was sent. Transfer

continues with a block count and continues in this way until the end of file is reached. Files may be

padded with 255 values to reach an even multiple of 128 bytes in size, but the download command will

always report true size. Once the end of the upload file is reached, the host should transmit a single end

of transmission byte. If the end of file is expected, the display will ACK one last time.

Table 42: XModem File Upload Protocol

Host

Display

Comments

254

Command Prefix

220

XModem Upload Command

133

Command Byte One

Command Byte Two

Command Byte Three

File ID LSB

File ID MSB

File Type

Size LSB

Size

Size MSB

C (If file fits)

Start of Header

128

Block Count

127

Inverted Block Count (255-Count)

<128 B>

128 Byte Data Block

*CRC MSB

*CRC LSB

ACK (NAK if counts don’t match)

…

End of Transmission

ACK (NAK if EOT is not expected)

Table 43: XModem File Download Protocol