Projectiondesign F1+ - Appendix A, Binary Operation Packet Type; Operation Packet Type; Operation Packet Payload Format

21
A.1 Operation Packet Type
The Operation packet is used by the host system to execute operations (such as Bright-
ness, Contrast, Image Position, etc) in the target system. The Operation packet payload
size is 11 bytes.
The source code definition of the Operation packet data structure is:
APPENDIX A, BINARY OPERATION PACKET TYPE
A.2 Operation Packet Payload Format
Byte Field Name
Field
Value
Description
1-7 1-7
Header, which consists of:
Byte 1-5: 0xBE 0xEF 0x03 0x19 0x00
Byte 6-7: CRC (not in use)
(see appendix C for an example of a
complete packet)
8
Operation Type 1 OPERATION_SET
2 OPERATION_GET
3 OPERATION_INCREMENT
4 OPERATION_DECREMENT
5 OPERATION_EXECUTE
7 OPERATION_DESCRIPTOR
9-10 Operation Number Operation ID.
11 Operation Validation Operation is valid, return only.
12 n/a (not available for use).
13-16 n/a (not available for use).
17-18 Operation Value
Value to SET or the value of the GET on
a return.
19-20 Operation Value Not in use
21-24 Lower Limit Lower Parameter limit.
25-28 Upper Limit Upper Parameter limit
29-32 Increment Increment steps within limits.
Table 2: Packet Payload format
typedef struct
{
eOPERATION_TYPE eOpType; // Operation type.
WORD eOperation; // Operation
WORD bIsAvail; // Operation validation.
DWORD dwTarget; // Operation target.
DWORD dwValue; // Operation value.
LONG lwMin; // Lower limit.
LONG lwMax; // Upper limit.
LONG lwInc; // Increment.
} OPERATION_MESSAGE;
This lets the user directly perform logical operations such as “Set Contrast = 80”.
If the user performs an OPERATION_GET, the returned packet will include operation
and target along with the value.