A N 6 9 2
28
Rev 0.4
5.1.3. Software Layers
In all of the sample projects, the layered software approach is followed. There is a distinct scope for each software
module, and all modules can communicate through each other's API functions. The software modules are
separated and focused to cover one specific task. Figure 24 shows the software layers and its relations.
Figure 24. Software Layers of the Example Codes
5.1.4. Radio Initialization in the Software Layers Perspective
Using the software layer approach, the example project can be understood easily. Each and every layer has its
own responsibility. If the upper layer, e.g. the "Application", wants to configure the hardware platform including the
host microcontroller and also the radio chip, it simply calls the hardware initial routine. The radio chip initialization is
started with a power on reset. The radio module sends a request to the si446x radio driver to reset the chip.
Thereafter, the driver forwards the request to the hardware abstraction layer that pulls down the SDN pin to
perform the power on reset. After the POR, the host MCU needs to send all the API properties to the radio via SPI
interface that means the "radio setup configuration" of the radio_config.h header file needs to be processed line by
line. The whole process of sending one API property and checking whether the radio is ready to receive the next
property is a repetitive task and is represented by a configuration loop. Finally, host MCU clears all the pending
interrupts of the radio.
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 ...
