Echelon FTXL Hardware - Manual (Page 87)

FTXL Hardware Guide 79
• outputDataStream – To write a frame to the host, the frame is first
copied to this buffer (including the length byte), and then the length is
written to the host. The interrupt service routine writes the rest of the
data.
• uplinkReceived – TRUE when an uplink message has been received.
• unnexpectedUplink – TRUE if the uplink message does not match the
expected uplink message.
• pExpectedUplinkMsg – Pointer to the expected contents of the next
uplink message.
Figure 35 shows the signals during the Interrupt Test. On the left-hand side,
you can see the downlink transfer; on the right-hand side, you can see the uplink
transfer. At the bottom, you can see the interrupt line.
Write Downlink Read Uplink
Transceiver
ready for
downlink data
Transceiver
has data to be
read by host
Unserviced
interrupt from
previous tests
Figure 35. Signals during the Interrupt Test
Service Pin and LED Test
The service pin, service interrupt, and service LED are all tested in a single
simple test. This test can be performed independently or in conjunction with the
other FTXL Transceiver tests.
This test is performed entirely in the service pin interrupt routine, which
illuminates the service LED each time the service pin is pressed, and clears it
each time the service pin is released.