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1. 

   lipi
   Member

   The LED is blinking but I can't access the device with dfu-util even if explicit vendorID:productID is given. When plugging in the board it shows up in dmesg:

   [50019.917036] usb 2-6: new full speed USB device using ohci_hcd and address 33
   [50020.139165] usb 2-6: configuration #1 chosen from 1 choice
   [50020.156542] cdc_acm 2-6:1.0: ttyACM0: USB ACM device

   But it doesn't seem to have DFU class interface (0xFE):

   # lsusb -d 1eaf:0004 -v | grep Class
   bDeviceClass 2 Communications
   bDeviceSubClass 0
   bInterfaceClass 2 Communications
   bInterfaceSubClass 2 Abstract (modem)
   bInterfaceClass 10 CDC Data
   bInterfaceSubClass 0 Unused

   Any idea what could I check?

   Posted 5 years ago #
2. 

   poslathian
   LeafLabs

   I'm glad you brought this up. While in regular user mode, there should be no DFU interface provided. It was this way in rev1, but because of cross platform compatibility issues, we found it was too difficult to run the serial port and the dfu on two different interfaces simultaneously in a way that worked on all platforms. The document that explains it all is here

   http://leaflabs.com/docs/maple-bootloader/

   In the current scheme, the ide will reset the board via toggling DTR/RTS on the serial line. Once reset, the board comes back up in DFU mode for a few seconds, during which the DFU transaction can take place.

   If youre using everything without the ide, you can see in libmaple that our Make program commands (make program_ram, make program_flash) actually call reset.py directly before calling dfu-util. This short script does the "right thing" over the serial port to engage a reset. For the record, the "right thing" is:
   1) DTR/RTS: LOW
   2) DTR: HIGH
   3) DTR: LOW
   causes reset

   Posted 5 years ago #
3. 

   lipi
   Member

   Thanks, I got it sorted. I checked out libmaple, installed the CodeSourcery binaries, created a link from /dev/maple to the ACM device and DFU programming works now.

   Posted 5 years ago #
4. 

   poslathian
   LeafLabs

   Cool. Note in libmaple that reset.py script that gets called everytime you hit make program_ram/flash. Thats responsible for hitting the serial port control lines with the reset command, throwing everything into DFU mode.

   Posted 5 years ago #

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