14 AVR2070 8240B-AVR-06/09
TRX Pin SAM7X
MCU Pin Port Port Function
SCK 50 PA22 SPI1_SPCK
SEL 49 PA21 SPI1_NPCS0
IRQ 80 PA30 IRQ0
CLKM 70 PB24 TIOB0
SLEEP_TR 13 PA8 PA8
RST 14 PA9 PA9
4.2.2 Firmware
The low level driver code is located in two files:
hal_arm.c
hal_arm.h
These files initialize SPI-1 and the discreet IO. Additionally, these files implement
handler functions that the remainder of the code uses to interact with the radio. For
instance, radio interaction is accomplished through functions such as
hal_frame_read and hal_frame_write
for receiving and transmitting a frame over the air. Other functions such as
hal_register_read and hal_register_write
allow access to radio control registers. Please refer to the detailed documentation
produced as a result of the integrated Doxygen comments in each source file. The
radio registers are fully described in the files at86rf212_registermap.h and
at86rf23x_registermap.h.
4.3 Serial Interfaces By default, none of the serial interfaces are enabled. Possible serial interfaces are
USB and RS232. (There are two RS232 COM ports on the SAM7X board.) The telnet
interface provides more than adequate user capabilities without the hassle of
configuring a serial interface such as Hyperterminal.
uTasker provides built in serial IO capabilities for RS232 and USB. To enable serial
IO for terminal interaction by the user the following defines can be enabled in
config.h:
#define USB_INTERFACE
#define SERIAL_INTERFACE
The baud rate parameters for the RS232 port are:
• 19,200 BAUD
• 8N1
To use the USB connection on a PC running Microsoft Windows, a Windows USB
driver must be installed. This USB driver is titled uTaskerAtmelVirtualCOM.inf and
can be downloaded from the uTasker website site at
www.utasker.com/software/softwareV1.3.html and complete documentation can be
found at www.utasker.com/docs/uTasker/uTaskerV1.3_USB_Demo.PDF. However,