| Hello,
I will try...after I replace some parts.
I did a "burn in" test leaving the Umarim powered with 13.18v. Configuration: GPS connected with gnd, 3.3v, Tx,Rx to UART0. Serial wire to UART1. When I came back approx 2hrs later I smelled burning smell and see the Umarim was drawing .60A and no LED blinking. Nothing GCS seemed to have stopped. The whole Umarim was very hot to the touch.
I look at it under the microscope and see IC4 has a broken solder joint on the pin 13 (PG: Power good comparator output. This is an open-drain output. A pullup resistor should be connected between PG and VOUT. The output goes active high when the output voltage is greater than 98.4% of the nominal value.).
I'm not sure if the crack was there before or due to thermal expansion/contraction when the board heated.
I will replace this part and re-test now. I will test your suggestions and see if I can program normal program code over UART0. I'm a little unclear how to specifically do some of those tests.
-David
On Feb 25, 2012, at 9:40 AM, Prof. Dr.-Ing. Heinrich Warmers wrote:
Hi David,
it seem to be a race condition on the boot/SDA1 wire ?
Can it bee that the inside bootlader is running?
Can you flash the normal program code over UART ?
Can you make a reset after power up?
Regards
Heinrich
David Conger schrieb:
Hello Paparazzi,
I have assembled by hand a Umarim for testing. Using PCBs from the Gerbers posted on the Wiki. Despite the comment left I was able to solder by hand the ITG3200 without issue. I have heard others doing the same without issues (FWIW).
I made a programming cable and bind plug following the WIki notes. It accepted the boot loader just like TWOG, Tiny, YAPA2. I then made a USB program cable again following notes from the Wiki. It accepted my airframe code and I got blinking LED.
Now for the interesting parts. When I used only a cable from my FTDI utility board (equivalent would be the FTDI->serial cable) I was able to launch GCS and verify in messages all sensors were working.
<Mail Attachment.png>
However, when I connected a Paparazzi GPS13 board to the UART0 connector per the Wiki the GCS was blank. I see this message in 'dmesg' output: "[171004.996161] ttyUSB0: 1 input overrun(s)".
The way to restore normal communications was not a reset. All attempts and permutations of reprogramming (USB) and power off/on failed to restore serial communications. I then re-upload the bootldr and then another program to restore communications. I also had to connect the FTDI board to UART1 after power up of the Umarim. In other words if anything was connected to the Umarim at power up serial communications fail. If I connected UART1 (serial comm) and GPS UART0 after power up it was fine.
Is there any comments how to test and see what the issue is? Why Umarim must have nothing connected to UART0/UART1 when powering up? The screen shot above was take when powered this way. Power up, then attach serial converter to UART1 and launch GCS. Umarim is flat so the PFD is correct. The plot shows my moving the Umarim at many orientations to make the plot more interesting. The baro I don't understand but maybe it's because I use the wrong definition for the baro in the airframe file. I'm using: <load name="airspeed_ads1114.xml"/>.
Regards,
David Conger
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