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AVR2070
13
8240B-AVR-06/09
This project should now include the original uTasker OS, SP4, and RUM patch files. A
test compile can now be tried using the IDE of choice. Appendix D explains two
common IDE’s that can be configured to compile uTasker with RUM support.
4.2 Radio Interface
The radio interface is composed of two parts - hardware and firmware. The hardware
is generally a radio board with physical connections to a microcontroller with the
firmware to manage the interface between the two.
4.2.1 Hardware
In order to
connect one of the AT86RF2xx transceivers to the microcontroller of
choice, the following diagram shows the generic connections needed to interface the
two parts.
Figure 4-2-1 Microcontroller to Transceiver Connections
There are various evaluation boards available that provide standalone transceiver
evaluation which provide header pins for easy connection to the AT91SAM7X-EK
board. See Appendix E for examples of connecting various evaluation boards.
This section highlights the required connections for the SAM7X and any one of the
three transceivers. Using the above generic connections, the AT91SAM7X-EK board
provides many GPIO pins for connection of the transceiver of choice. The table below
shows one method of connecting the two devices together with SPI1 and GPIO.
Table 4-2-1 AT91SAM7X-EK Connections
TRX Pin
SAM7X
MCU Pin Port Port Function
MISO 56 PA24 SPI1_MISO
MOSI 55 PA23 SPI1_MOSI