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Re: [Paparazzi-devel] ESC Startup

From: Felix Ruess
Subject: Re: [Paparazzi-devel] ESC Startup
Date: Sat, 3 Mar 2012 20:50:12 +0100

Hi Neil,

do you have any plans to add an ethernet driver (without the huge RJ45 connector though)?

For one project we ended up no using Lisa/L and instead modded 3 Tobi boards so we could interconnect them via ethernet.

I would also be very interested to hear why you choose the LPC1769 and if that is something that has already been finally decided.

Cheers, Felix

On Fri, Feb 24, 2012 at 11:18 PM, Martin Mueller <address@hidden> wrote:
Hi Neil,

Some of you may have heard that Gumstix is developing a UAV board
based on Lisa/L and RoboVero. The rumours are true!

First of all, thanks to everyone who has offered input so far. I have
a couple more questions - hopefully this is the right forum.

 * It seems like the Lisa/L makes use of several LDOs - should we
beware of SMPS in UAV applications?

except for the Lisa/M all Paparazzi boards have a switching power supply to get the voltage down to 5V followed by one or more linear 3.3V regulators. If there is more than one its mostly to separate "listeners" (sensors) from "loud parts" (e.g. transmitter).

 * I'm told that ESCs need to have a PWM signal when power is applied
for calibration. How can this be achieved if the control electronics
are powered by the ESCs?

It is not a question of ms until the ESCs complain about not having a signal. Paparazzi initializes the servo/controller PWM outputs with a default value very early after reset (modem initialization can take up to 2.5s) and then outputs the wanted signal when everything is up.

Thanks in advance. Will keep you posted on our progress.

Did I understand correctly that you want to use a LPC1769 for the board? Is the NXP CMSIS driver library you use open source (GPL) compatible?

There is nothing wrong with that processor (family) but please take into account that writing the low level drivers and adapting it to the Paparazzi driver layer took a huge amount of time/effort in the past. We had that from ATMEGA128 -> LPC2148 -> STM32F10x and are not completely finished with the last step as the STM license turned out not to be open source compatible (yet sounds very similar to the NXP license).

What keeps you from using one of the well known STM32 processors (with GPL V3 libopencm3 support)?


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