EM260-RTR datasheet(31/50 Pages) SILICONIMAGE

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EM260

Page 31

120-0260-000M Rev 1.1

5.7.2

EmberZNet Serial Protocol Frame—Version Command

Figure 10. EmberZNet Serial Protocol Frame - Version Command Example

1. Activate Slave Select (nSSEL).

2. Transmit the appropriate command:



0xFE

: SPI Byte indicating an EZSP Frame



0x04

: Length Byte showing the EZSP Frame is 4 bytes long



0x00

: EZSP Sequence Byte (Note that this value should vary based upon previous sequence bytes)



0x00

: EZSP Frame Control Byte indicating a command with no sleeping



0x00

: EZSP Frame ID Byte indicating the Version command



0x04

: EZSP Parameter for this command (desiredProtocolVersion)



0xA7

: Frame Terminator

3. Wait for nHOST_INT to assert.

4. Transmit and receive 0xFF until a byte other than 0xFF is received.

5. Receive response 0xFE (a byte other than 0xFF) and read the next byte for a length.

6. Stop transmitting after the number of bytes (length) is received plus the Frame Terminator.

7. Decode the response:



0xFE

: SPI Byte indicating an EZSP Frame



0x07

: Length Byte showing the EZSP Frame is 7 bytes long



0x00

: EZSP Sequence Byte (Note that this value should vary based upon previous sequence bytes)



0x80

: EZSP Frame Control Byte indicating a response with no overflow



0x00

: EZSP Frame ID Byte indicating the Version response



0x04

: EZSP Parameter for this response (protocolVersion)



0x02

: EZSP Parameter for this response (stackType)



0x10

: EZSP Parameter for this response (stackVersion, Note that this value may vary)



0x47

: EZSP Parameter for this response (stackVersion, Note that this value may vary)



0xA7

: Frame Terminator

8. Deactivate Slave Select.

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