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| -rw-r--r-- | doc/telemetrum-doc.xsl | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/doc/telemetrum-doc.xsl b/doc/telemetrum-doc.xsl index 1bcd8632..90e202b4 100644 --- a/doc/telemetrum-doc.xsl +++ b/doc/telemetrum-doc.xsl @@ -752,6 +752,21 @@ sensor... nothing is permanently "lost" or "damaged" if the calibration is poor. </para> + <para> + In the unlikely event an accel cal that goes badly, it is possible + that TeleMetrum may always come up in 'pad mode' and as such not be + listening to either the USB or radio interfaces. If that happens, + there is a special hook in the firmware to force the board back + in to 'idle mode' so you can re-do the cal. To use this hook, you + just need to ground the SPI clock pin at power-on. This pin is + available as pin 2 on the 8-pin companion connector, and pin 1 is + ground. So either carefully install a fine-gauge wire jumper + between the two pins closest to the index hole end of the 8-pin + connector, or plug in the programming cable to the 8-pin connector + and use a small screwdriver or similar to short the two pins closest + to the index post on the 4-pin end of the programming cable, and + power up the board. It should come up in 'idle mode' (two beeps). + </para> </section> </section> </chapter> |