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[Paparazzi-devel] Built in Data Logger and watchdog

From: Rui Costa
Subject: [Paparazzi-devel] Built in Data Logger and watchdog
Date: Thu, 30 Dec 2010 14:51:54 -0100

I started the design of a new paparazzi autopilot board, based on TWOG but with some changes and additions.
I will add pressure sensors, servo pins, SD data logger and digital outputs for relays.
The pressure sensors will be the same used on Lisa/L and the SD Data Logger will be based on:
So, I will have a board with two MCU's. The second MCU will do the SD Data logging and other things. For example, control navigation lights.
Regarding to the data logger UART Connection:
It says "The two serial inputs LPC_RXD0 (J7) and RXD1 (J2) are used to receive data. The received data is not forwarded to TX0/1 by software (the UART TX pins are deactivated). If the logger is put in between Tiny and the modem the connection should be done with a wire so that a logger failure does not cause any data link issue."
So, I have to have the next connections:
TWOG                            DATA LOGGER
LPC_RXD0 (J7) -------------- LPC_TXD0 (J7)
RXD1 (J2) ---------------------- TXD1 (J2)
This is right?
And about an watch dog for MCU freeze. You think it's needed or not? And how to detect the MCU freeze with another MCU to make the RESET?
Have another ideias to implement?

Rui Costa

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