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USB bootloader problems

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E_forge

Posted: Mar 30, 2012 - 11:27 PM

Joined: Oct 20, 2011
Posts: 23

Hi!

OK, I have been trying to establish a simple connection with my AT32UC3C1512 microcontroller (comes with pre-installed bootloader according to Atmel app notes).

I simply try connecting my protoboard to my computers USB port and use commands "dmesg" and lsUSB to see if it is detected.

Well, it is not. There's no connection or enumeration attempt done by the computer. I figured out this is because the D+ line is not pulled high by the MCU. Why would this be? with an evaluation board for AT32UC3A-series the device can be seen with "lsUSB" as "ID 03eb:2ff8 Atmel Corp.". My protoboard has similar connection (the physical USB-related circuitry is basically the same), but it is not recogized.

I had a USB isolator chip ADuM 3160 installed at first, but I removed it and hardwired the USB connection because it was not working. Now the circuit is similar to the USB connection on the evaluation board I tried. Now I know that the problem really wasn't with the isolator chip, but with the MCU itself.

Would someone kindly provide a check-list on how to get the USB boot loader responding. I'm kinda running out of options here. Would the problem be with software or hardware? I think it shouldn't be hardware since the connection is very simple, but how can I be sure?

I have AVR dragon in my disposal, and I have already tried reading Device ID and Device information through JTAG. I also reset the device with run -r option so that the MCU would resume it's normal operation after JTAG connection. Still, not getting my protoboard to recognise as USB device by my computer

Any ideas?

E_forge

Posted: Apr 01, 2012 - 10:43 AM

Joined: Oct 20, 2011
Posts: 23

Alrighty!
I managed to root the problem down to software, and there seems to be an incompatibility with the provided DFU boot loader and my proto board configuration

My crystal (8MHz) is hooked up to osc1, but the firmware is written for osc0. I also tried replacing all references to osc0 with osc1 in the bootloader code, but I'm still getting nothing, and it would also seem that the crystal is not oscillating (tested by scope).

This would indicate that there's still something wrong with the code, but I can't figure out what. Have you ever come across this sort of problems? I still need some help here.