[libopencm3-devel] Problem with USB DFU

[Sergei K. <so...@ya...>]

Hi 
guys!
 
I’m trying work with an usb_dfu 
example for lisa-m-1 on my Lisa M 2 board with STM32F105 on board together with 
stm32_mem.py on Linux Virtual Machine under Windows XP. And it doesn’t work 
properly.
First I shold say, that stm32_mem 
works fine with the STM onboard sys boot dfu bootloader. But with this example 
upload starts, but on the 4th page (0x08004000) occurs an broken pipe 
usb error.
 
If I set the stm32_mem.py only to 
erase pages there no broken pipe error occurs, but also no erase as well. I’ve 
looked on the code and found, that in the usbdfu_getstatus_complete fun “case 
CMD_ERASE:” is never called, and the erase wants “case 0x08:” in the “switch 
(prog.buf[0])”. But there is also a problem – it erases only one page with 
address 0x08001000 and nothing else, however stm32_mem wants to erase from 
0x08002000 first. Seems to be a problem with the address 
receive
 
Also as I said, by the erasing and 
programming the broken pipe error comes on the 4th page, however, 
when I set in the usb_device_descriptor variable the value bMaxPacketSize0 = 32 
the broken pipe error comes on 8th page first… That is really 
curious.
 
Also I have tested the same Virtual Machine under Windows 7 and there was no broken pipe error.


You guys have more experience with 
the usb stuff, could you say if there is a problem in USB setup or in the DFU 
protocol itself.
 
Thanks,
Sergey