A N 6 9 2
32
Rev 0.4
Figure 27. Activate CW/ PN9 Mode
5.2.2. Direct Mode Transmission and Reception
The source code for this operating mode is the same as the one used for Continuous Wave or PN9, except the
radio configuration properties have been changed to direct mode RX/TX.
The radio in direct mode can be used if an external MCU is connected to its RX/TX GPIOs in order to receive or
transmit arbitrary data. The radio interrupt sources in this mode can still be used; for example, the Preamble Detect
or Sync Word Detect interrupt will work in this mode too.
The direct mode is useful when already existing proprietary communication protocol has to be implemented using
Silicon Laboratories radio transceivers.
Figure 28. GPIO Connections between the Radio and the Host MCU (Direct TX)
Figure 29. GPIO Connections between the Radio and the Host MCU (Direct RX)
Summary of Contents for Si4455 Series
Page 8: ...AN692 8 Rev 0 4 Figure 6 Device Configuration Options ...
Page 22: ...AN692 22 Rev 0 4 Figure 21 Supply Current versus Time Diagram from Shutdown to RX State ...
Page 23: ...AN692 Rev 0 4 23 4 4 Radio Chip Waking Up Figure 22 Radio Wake Up Process ...
Page 35: ...AN692 Rev 0 4 35 Figure 32 Transmission Flowchart ...
Page 39: ...AN692 Rev 0 4 39 Figure 33 Reception Flowchart ...
Page 41: ...AN692 Rev 0 4 41 Figure 34 Bidirectional Variable Packet Example Project Flowchart ...
Page 47: ...AN692 Rev 0 4 47 Figure 41 Long Packet Transmission Flowchart ...
Page 48: ...AN692 48 Rev 0 4 Figure 42 Long Packet RX Flowchart ...
