UM0934 datasheet(51/113 Pages) STMICROELECTRONICS

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UM0934

Host interface

Doc ID 17389 Rev 2

51/113

5.3.8

CMD_ReadDBRequest (90h)

This command is used by the external host to read the current value of an MIB object.

The ST7570 checks the parameters for validation:

●

if valid, the request is accepted and the ST7570 returns the object value through a

CMD_ReadDBConfirm(Section 5.3.9)

●

if the check is not valid, the request is rejected and the ST7570 replies with a

CMD_ReadDBError(Section 5.3.10).

5.3.9

CMD_ReadDBConfirm (91h)

This command is sent by the ST7570 to acknowledge a CMD_ReadDBRequest() performed

by the external host, if the request has been accepted and executed without errors.

The ConfirmData field returned by this command has the same format and content of the

field RequestData (Table 27)of the CMD_WriteDBRequest().

5.3.10

CMD_ReadDBError (92h)

This command is sent by the ST7570 to notify that a CMD_ReadDBRequest() performed by

the external host has been rejected because of an invalid request data.

Table 31.

CMD_ReadDBRequest: Syntax

Source

Command(Args)

Possible response

Ext. host CMD_ReadDBRequest (RequestData)

Request accepted:

CMD_ReadDBConfirrm(RequestData)

Error: CMD_ReadDBError(ErrorCode).

Table 32.

CMD_ReadDBRequest: RequestData

Byte index

Label

Description

0 - 1

INDEX

Database entry index. Refer to MIB table for available objects.

LSByte sent first, the MSByte is always set at 00h.

Table 33.

CMD_ReadDBConfirm: Syntax

Source

Command(Args)

Possible response

ST7570

CMD_ReadDBConfirm(ConfirmData)

None

Table 34.

CMD_ReadDBError: Syntax

Source

Command(Args)

Possible response

ST7570

CMD_ReadDBError(ErrorData)

None

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