doc: Describe Packet Link mode in the initial usage section

It's not described in any detail elsewhere...

Signed-off-by: Keith Packard <keithp@keithp.com>

diff --git a/doc/usage.inc b/doc/usage.inc
index d010f398e76d926559dc5eb398217f074b0b88f3..dd795bdd4125f7a0ad55987a1a0ba35d000ce12c 100644 (file)
--- a/doc/usage.inc
+++ b/doc/usage.inc
@@ -323,3 +323,22 @@
                different kind of battery to any of these will destroy
                the board.
                endif::telemega,easymega,telemetrum[]
                different kind of battery to any of these will destroy
                the board.
                endif::telemega,easymega,telemetrum[]

+
+       === Using Packet Link Mode
+
+               All AltusMetrum flight computers that have a radio can
+               communicate with the ground station software for
+               configuration and other operations using the Packet
+               Link mode. This uses radio communication instead of a
+               USB cable. To set this up, the ground station software
+               must be configured to the correct data rate, frequency
+               and callsign.
+
+               You can monitor Packet Link mode from TeleBT or
+               TeleDongle by watching the LEDs. Each time the device
+               transmits, the red LED will flash. When the link is
+               busy, or when the link is not working, the device will
+               transmit 10 times per second, so the LED will flash
+               rapidly. When the link is working and there is no data
+               to send, the link will flash once per second, and the
+               LED will flash more slowly.