Messages

1

µTasker general / Re: uTasker MSD Serial Loader is not working with custom board

« on: September 22, 2017, 04:33:45 PM »

Hi Mark,

Sorry, I forgot to make that change in the code, now it is working.
Thanks a lot

Miguel

2

µTasker general / Re: uTasker MSD Serial Loader is not working with custom board

« on: September 22, 2017, 03:03:33 PM »

Mark

We were surprised as well, so we tried different things to avoid connecting Vout33 to VDD because our board is powered by battery in nomal operation. We added an external Cstab to Vout33 with and then we tried placing 33 ohm resistor in the D+ and D- bus, but it didn't work. Finally we discovered that the bootloader works fine in some USB ports of the PC, and in different PC's, so we think the problem may be the USB versions on our computers since we have USB 3.0 in some of them and older versions than USB 2.0 in others. For now our solution is to use the bootloader in those ports that actually work.

Now, we are facing another problem: the bootloader seems to work fine with small binary files, (under 100 kB), but it doesn't with larger files. Do you have any idea of how to solve this?

Regards

Miguel

3

µTasker general / Re: uTasker MSD Serial Loader is not working with custom board

« on: September 19, 2017, 02:29:08 PM »

Mark

You were right, there was a problem with the Vout33 pin. Vregin was already connected as shown in the figure and the problem was solved by connecting Vout33 to VDD, now it is working.

Best regards

Miguel

4

µTasker general / Re: uTasker MSD Serial Loader is not working with custom board

« on: September 18, 2017, 06:01:20 PM »

Mark,
I am using the kinetis MK53DN512CMD10.
Attached you will find the processor's clock circutry. The board does not include any USB circuitry other than the components shown in the socket connection.

Thanks

Miguel

5

µTasker general / uTasker MSD Serial Loader is not working with custom board

« on: September 18, 2017, 03:56:48 PM »

Hi everyone, I'm having some troubles while trying to use the MSD mode of the uTasker Serial loader project for kinetis. I have already test the bootloader with a TWR-K53 using the TWR-ELEV headers (I connected the USB cables to the headers directly) and everything worked fine. Nevertheless, when I flash the same .elf file to my custom board, my PC doesn't recognize the USB conection ("usb device not recognized").
I think it may be a hardware problem. I have attached the schematic of my custom board USB conection.