A N 6 3 3
60
Rev. 0.7
10.6.3. Key Fob Packet (Type B)
The following development kits use also this type of packet:
Si4010/Si4355 Key Fob Development Kit
Si4010/Si4355 One-Way AES Development Kit
Si4010/Si4355 One-Way Sub-GHz Key Fob to LED Receiver Stick
Si4455 Two-Way Sub-GHz Key Fob to LED Receiver Stick
The used packet can be seen below:
10.7. Custom Packet Transmission
This example code works the same way as the standard packet transmission with the exception that the content of
the payload field in the packet is customizable.
10.8. Custom Packet Reception
This example code works the same way as the standard packet transmission with the exception that the content of
the payload field in the packet is customizable.
10.9. Two-Way Packet (Bidirectional Packet)
The purpose of the two-way packet example code is to demonstrate how to use the radio for a two-way link
communication. By default, the two devices are in receiver mode and waiting for either a request message or a
pushbutton event from the user. When the first pushbutton is pushed on one of the WMBs, it sends a request
immediately to the other radio. The LED activity shows if the radio packet is sent successfully. The receiver replies
with an acknowledgment followed by LED activity.
The payload of the request is 64 bytes long and customizable as well.
The payload of the reply is the 3 byte long “ACK” string.
Table 14. Structure of the Key Fob Packet (Type B)
Preamble
Sync Word
Chip ID
Status
Packet Count
CRC
13 byte
2 byte
4 byte
1 byte
2 byte
2 byte
Table 15. More Detailed Structure of Key Fob Packet (Type B)
Number of Bytes
Field Name
Description
13
Preamble
0xAA
2
Sync
0x2D, 0xD4
4
Chip Id
Unique, factory-burned chip ID
1
Status
Lower 5 bits are the button information
2
Packet Count
Rolling counter
2
CRC-16
Generator X
16
+X
15
+X
2
+1, start value 0xFFFF
Table 16. Structure of the Request Message
Preamble
Sync Word
Payload
CRC
32–40 bits
2 bytes
64 bytes
2 byte
Содержание EZRADIOPRO Si4060
Страница 24: ...AN633 24 Rev 0 7 Figure 20 Supply Current versus Time Diagram from Shutdown to RX State...
Страница 67: ...AN633 Rev 0 7 67 Figure 48 Variable Length Packet Reception Flowchart...
Страница 69: ...AN633 Rev 0 7 69 Figure 50 Packet Matching Reception Flowchart...
Страница 73: ...AN633 Rev 0 7 73 Figure 54 Packet Reception with Automatic RX Hopping Flowchart...
Страница 75: ...AN633 Rev 0 7 75 Figure 56 Packet Reception with Manual Rx Hopping...
Страница 80: ...AN633 80 Rev 0 7 Figure 62 Long Packet Transmission Workflow...
Страница 81: ...AN633 Rev 0 7 81 Figure 63 Long Packet RX Flowchart...