cerb40 flashing

[solipsvs]

xavier,

do i need something in these 3 places for an oled to work? 

'RV1' is not in the step by step instructions.  i opened my other preenfm2 up and it has one.  its also using an oled.  the PCB seems to be another color though, perhaps an older revision?

thanks

[Xavier]

The 2 resistors are only usefull when you use a LCD.
But does not hurt at all with an OLED.

The third one is a external connector that would allow to read voltage (connected to ADC) if it was used. But it's not So also useless.

Best

[solipsvs]

cool.  i figured out what the problem was.  i accidentally destroyed a trace so i jumped it.  works great now.  thanks!

[pauto]

Hi, I have just build the preen and I am trying to flash the cerb40 with no succes, I try to follow the steps but I am totally lost.

I am using Macbook with Mavericks, and I had downloaded and installed dfu util with brews, now when I plug the preen with the jump3 conected and run the bootloader command it says that

Last login: Sun Dec 27 12:42:15 on ttys001
MacBook-Pro-de-pau:~ pau$ /Users/pau/Desktop/bootloader/install_bootloader.cmd ; exit;
dfu-util 0.8

Copyright 2005-2009 Weston Schmidt, Harald Welte and OpenMoko Inc.
Copyright 2010-2014 Tormod Volden and Stefan Schmidt
This program is Free Software and has ABSOLUTELY NO WARRANTY
Please report bugs to dfu-util@lists.gnumonks.org

dfu-util: Could not open file p2_boot_1.11.bin for reading: No such file or directory
logout

[Proceso completado]

I also tried to take out the cerb40 and plug it directly to the computer with mini usb but same message, what am I doing wrong?

I soldered the mini-usb according this http://i.imgur.com/RqPxH1ih.jpg is that right?

As said before if I disconnect jump3 the leds are working so I suppose I did no mistake with the soldering.

Hope someone can help me out!!

Cheers!!

[Xavier]

Hi,

You execute the install_bootloader.cmp from an other folder, so it does not find the firmware file.
Instead of :
> /Users/pau/Desktop/bootloader/install_bootloader.cmd ; exit;
Try
> cd /Users/pau/Desktop/bootloader/
> install_bootloader.cmd

Soldering the CERB40 mini USB cable is explained at the bottom of this page :
http://ixox.fr/preenfm2/build-it/the-pcb/

Best,

Xavier

[pauto]

It's a bit weird but without changing anything, just the place where "bootloader" folder was I managed to install the bootloader, the most weird is that I had allready checked that before and did not work but all is good, now I have a working PreenFM unit 

Thanks!!!