Re: [Paparazzi-devel] Umarim Lite v2: no contact, no flashing
From:
Christophe De Wagter
Subject:
Re: [Paparazzi-devel] Umarim Lite v2: no contact, no flashing
Date:
Sat, 9 Feb 2013 12:55:28 +0100
We had almost the same with the NavGov3
When plugging the USB while connected to the lab-supply the ITG3200 broke down holding the boot pin low meaning the LPC did not boot anymore and everything looked dead. The presumably damaged invensense gyro was holding the boot pin "half-low" at about 0.6v. Replacing the ITG fixed it.
-Christophe
On Sat, Feb 9, 2013 at 12:21 PM, S. Spies <address@hidden> wrote:
Hi again,
finally I can report, that my Umarim Lite is fully working again.
I had to replace the LPC2148, the ADXL345 and the GPS13 module.
Because it stopped working from one moment to the other I can only
think of an ESD situation.
The repair costs me a lot of time, trying and testing - really no
fun.
My advice: keep yourself grounded ;-)
Thanx to everyone who helped!
Cheers,
Steffen
Am 18.01.2013 17:15, schrieb Steffen Spies:
Hi everyone,
my board is working again.
I've had checked almost everything, all parts around the USB,
removed T1 for a new one, etc.
At the end I put a new LPC2148 on the Umarim and the system is
back alive.
For some reason the processor seemed to be partly dead.
Thanx for you help,
Steffen
Am 11.01.2013 20:21, schrieb Eduardo lavratti:
some weeks ago i had the ame problem.
i found a 1.5k resistor broken.
so ... check the resistor and DTA transistor around USB
circuit.
Date: Fri, 11 Jan 2013 17:39:58 +0100
From: address@hidden
To: address@hidden
Subject: Re: [Paparazzi-devel] Umarim Lite v2: no contact,
no flashing
I also checked VBUS: 3,3V
between R8 & R13.
Am 11.01.2013 16:18, schrieb Steffen Spies:
Hi,
my Umarim Lite v2 board suddenly stopped working and I
have no idea why.
What happened:
The board was running fine with a very basic software for
a couple of days.
I decided to build a new software with some smaller
changes, connected it via USB to the laptop, did a
powercycle and ... nothing.
a) First idea, flashing failed, so I tried again and again
and again, but flashing didn't work.
I checked /var/log/syslog (or dmesg), but the laptop
(Ubuntu 12.10) doesn't detect the board at the USB port.
b) Next idea, maybe a broken bootloader:
Connected PPZUAV TFDI Utility board to UART0(disconnected
GPS), P0.14 to GND, power on and a
c) So the processor seems to be working, I checked 5V and
3.3V and the crystal produces a very clear 12 MHz signal.
d) I reconnected the board to the PC, checked dmesg, but
nothing. No signs of life!
The Umarim has another USB connector via Molex, tried this
too with same negative result.
Conneted the FTDI board to the autopilot via UART0, P0.14
to GND, power on and I tried
make AIRCRAFT=TwinStar_Umarim ap.upload FLASH_MODE=ISP
Well, a lot of dots, but no flashing of the board.
Interestingly it says: no USB device (FTDI is
found at ttyUSB0 and user is part of dialout group)
My questions:
- does anyone has an idea what I could check, test,
measure, nameit?
- does serial flashing really work?
- did the first procedure make the right bootloader?
- does the bootloader give a kind of "hello world" via
UART0/1?
- did I miss something?
- It looks to me, that the processor is running (crystal
makes a clear signal, bootloader programming works)
- I already tried a second laptop and USB
cable