[U-Boot-Users] USB device for AT91RM9200

[larytet.54154763 at bloglines.com]

Hi,



I am trying to add USB device support to the AT91RM9200. I use Atmel
evaluation board. 



I downloaded USB framework and a couple of examples
from the Atmel WEB site and I coded simple enumeration process. Unfortunately
it does not work. 



I see that I get a setup request from the host 

80
06 00 01 00 00 40 00

Device answers with 64 bytes of the device descriptor

12 01 10 01 02 00 00 08 E1 18 1B 00 10 01 01 02 03 01



Host immediately
resets the device (bus reset), I see bit AT91C_UDP_ENDBUSRES and reset end
point 0 (EP0).



After that host sends "set address"

00 05 2D 00 00 00 00
00

Device sets the address (UDP_FADDR and UDP_GLBSTATE) and attempts to send
zero length packet (ZLP). 



When I send ZLP I set AT91C_UDP_TXPKTRDY bit
and wait for bit AT91C_UDP_TXCOMP. AT91C_UDP_TXCOMP remains zero forever.




I tried to answer first setup with ZLP and ZLP itself works just fine
- the chip is able to generate at least 5 ZLP packets without problems.



I tried also to break out from the loop waiting TXCOMP and continue as normal,
no matter what. In this case host (Linux fedora 7) trys 4 times to send "get
descriptor" (i answer the request every time as i did in the first round)
and "set address" (i try to answer with zlp) and gives up.



It appears that
sending of the packets (DATA_IN transactions) does not work after host issued
reset.



The following is a memory dump of the USB device when i am in the
loop waiting for TXCOMP



fffb0000 : 0x000205c6       132550  ....

fffb0004
: 0x00000000            0  ....

fffb0008 : 0x00000100          256  ....

fffb000c : 0x00000000            0  ....

fffb0010 : 0x00000000         
  0  ....

fffb0014 : 0x00000000            0  ....

fffb0018 : 0x00001200
        4608  ....

fffb001c : 0x00003b01        15105  .;..

fffb0020 : 0x00000000
           0  ....

fffb0024 : 0x00000000            0  ....

fffb0028 : 0x00000000
           0  ....

fffb002c : 0x00000000            0  ....

fffb0030 : 0x00080804
      526340  ....

fffb0034 : 0x00000000            0  ....

fffb0038 : 0x00000000
           0  ....

fffb003c : 0x00000000            0  ....

fffb0040 : 0x00000000
           0  ....

fffb0044 : 0x00000000            0  ....

fffb0048 : 0x00000000
           0  ....

fffb004c : 0x00000000            0  ....

fffb0050 : 0x00000000
           0  ....

fffb0054 : 0x0000009a          154  ....

fffb0058 : 0x000000cd
         205  ....

fffb005c : 0x000000af          175  ....

fffb0060 : 0x000000ca
         202  ....

fffb0064 : 0x00000001            1  ....

fffb0068 : 0x00000001
           1  ....

fffb006c : 0x00000001            1  ....

fffb0070 : 0x00000000
           0  ....

fffb0074 : 0x00000000            0  ....



any tip/help
is greatly appreciated