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Re: [Paparazzi-devel] help on the new version of autopilot

From: Michel GORRAZ
Subject: Re: [Paparazzi-devel] help on the new version of autopilot
Date: Mon, 10 Dec 2007 18:01:00 +0100

Hi Chen,

The reset pin of the GPS receiver (GPS_RESET) is connected to a GPIO of the LPC (P1.21) and also to pin #5 of the "Download" connector.
This signal is active low and can be used for :
1) reset the GPS  with the LPC if needed
2) disable GPS receiver serial bus pins (TXD1 & RXD1 -> high impedance).
In this state, pin #6 (LPC_TXD0) and # 7 (LPC_RXD0) of the "Download" connector are ready to be used for bootloader programming (or external GPS receiver connecting )

WARNING : NEVER hold GPS_RESET signal high (more than 1.95v) = GPS reset pin will be destroyed !
(sorry, i will fix that on the next version)

So :
- If unused (common case), leave "Download" connector pin #5 unconnected and set P1.21 of the LPC as an input
- if you need to reset the GPS, always hold P1.21 value low and work only with GPIO direction register : input = enable GPS , output = reset GPS
- for bootloader programming, ground "Download" connector pin #5 and proceed with the standard bootloader programming procedure.

LPC_RESET is no more available on a connector : if you want to reset the autopilot, just turn the power off then on :)


2007/12/10, C Kuo <address@hidden>:
Hi there

  My name is Chen (the guy from Sheffield UK), after I studied on the design of
Tiny 2.1, I have some question I would like to ask (hope you guys don¡¦t mind

  GPS_RESET is connect to GPIO on the LPC2148 in this version (where it left
open on the Tiny 1.3), however, I can¡¦t see where LPC_RESET connect to on the
sch diagram, is it left open in this version (In tiny 1.3, LPC_RESET is connect
to Serial 1)?



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