doc: Describe Packet Link usage and selecting RF param defaults for TeleMini

Packet Link mode is the only communication method available for
TeleMini and deserves some special mention in the docs.

TeleMini allows forcing of RF parameters back to known defaults by
hooking SWCLK to ground at power on (hole 7 to hole 3 on the debug
connector). Describe this process so that users will be able to get
TeleMini back to known values and recover.

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

diff --git a/doc/telemini.inc b/doc/telemini.inc
index b40582a2093638c72321bd5cb84cf9b253f33eb9..08893dfba63da04f11c3362f6e3684968846502b 100644 (file)
--- a/doc/telemini.inc
+++ b/doc/telemini.inc
@@ -94,6 +94,56 @@
                the left power switch wire. Hook a lead to either of the
                mounting holes for a ground connection.
 
+       === Using Packet Link Mode with TeleMini
+
+               After TeleMini powers up, it will check to see if some
+               device is attempting to communicate with it using
+               Packet Link Mode. If so, it will switch to idle mode
+               and start communicating. To switch to flight mode,
+               reboot the device either over the radio link or by
+               powering it off and back on.
+
+               If no ground station is attempting to communicate
+               using Packet Link Mode, TeleMini will enter pad mode
+               and prepare for flight.
+
+               The sequence of operations to use Packet Link Mode
+               with TeleMini is:
+
+               1. Configure the ground station data rate, frequency
+               and callsign to match the TeleMini settings.
+
+               2. Start Packet Link Mode in the ground station by
+               selecting the desired operation (Safe Flight Data,
+               Configure Altimeter, Fire Igniter or Monitor
+               Idle). Select the TeleBT or TeleDongle device. The
+               red LED should begin flashing rapidly.
+
+               3. Turn on TeleMini. You should see the red LED flash
+               very rapidly during the initial communication burst,
+               but it should then slow down when the link is idle.
+
+               Once TeleMini is in Idle mode, it will stay in that
+               mode until rebooted. That means you can stop one
+               Packet Link operation, wait a while and start another
+               Packet Link operation.
+
+       === Forcing TeleMini radio parameters to known defaults
+
+               If you don't know what the TeleMini frequency and
+               callsign settings are, you can temporarily force it
+               back to the original default values (frequency
+               434.550MHz, callsign N0CALL) by connecting a wire
+               between hole 3 and hole 7 on the debug connector. Hole
+               3 has the square pad around it, hole 7 is the one
+               nearest the MS5607 baro sensor, which is a rectangular
+               component with a metal cap that has two holes in it.
+
+               Once TeleMini has been powered up with this wire
+               connected, the wire may be removed. The radio
+               parameters will stay set to these default values until
+               changed by the user or when the device is rebooted.
+
        === TeleMini v1
 
                TeleMini v1 is the earlier version of this product. It