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Re: [Paparazzi-devel] Re: trouble getting started...

From: David Carlson
Subject: Re: [Paparazzi-devel] Re: trouble getting started...
Date: Thu, 20 Jan 2011 20:08:46 -0800
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv: Gecko/20101208 Thunderbird/3.1.7

That is correct. Since TWOG has no on-board GPS, you only need to hold BOOT low. Also, it should be grounded to ground, which should be shared between your serial converter and the TWOG. In other words, the serial converter ground, BOOT, and TWOG ground should all be connected and at the same voltage potential.


On 01/20/2011 04:57 PM, Chris Gough wrote:
Hi James,

P0.14 of the TWOG V1.x is a label from the schematic diagram. I think
it's the same thing as the pin called "Boot" (pin number 4 of the
"Download/GPS" socket) on the pinout diagram.

Someone please correct me if that's wrong, I just use the "boot"
switch built into my ISP (custom unit that exists to flash autopilot
bootloaders); it "just works".

Chris Gough

On Fri, Jan 21, 2011 at 11:36 AM, James Spezeski
<address@hidden>  wrote:
I'm pretty sure the bootloader was flashed by the supplier, but I'm not sure
that I didn't break it somehow.  I tried flashing it today but I was
confused about a few things.

The paparazzi website says that:
"The Bootloader is uploaded through the serial interface UART0 (Serial1) by
connecting certain point on the board to ground during power-up, sometimes
referred to as: holding low. On the board Tiny V1.x pin P0.14, Tiny V2.x
this pin is called BOOT). Also GPS_RESET has to be tied low during the
serial programming to keep the GPS receiver quiet that shares the serial
port with the download."

What "certain point" on the twog must be connected to ground?

Also, it says that for twog it says that the boot pin must be connected to
ground, is this the serial converter ground?

On Wed, Jan 19, 2011 at 12:30 PM, Martin Mueller<address@hidden>  wrote:
yes :-)

Are you sure a USB bootloader was flashed and/or you did not overwrite it?
What commands did you issue?


On 19.01.2011 20:18, James Spezeski wrote:
I just checked and there was 5V on the VBUS pin.  I also checked all the
electrical connections from the pins on the USB connector (the one that
plugs into my computer) to the solder joints on the TWOG, and they were
all good.

Should I try flashing the bootloader?


On Wed, Jan 19, 2011 at 4:25 AM, Martin Mueller<address@hidden
<mailto:address@hidden>>  wrote:

    Hi Thomas,

     >  Maybe at least my second comment on the power consumption can help.

    my statement regarding the "self power" was wrong - hope that does
    not confuse. The Vbus pin only switches the bootloader on, any
    LPC2148 board does not consume a noteable current through USB. They
    actually are self powered, not bus powered.


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