BB USB: how to do free form bulk in

Bluetooth requires bulk transfers whose length is not known in advance. Nor is the number of transfers, even – and that number can be none.

How do I do this on the BeagleBoard, please?

I think this has been covered before, but I don’t recall seeing a definitive answer.

I don’t know about anyone else, but I’ve never managed to get the timeout to work. This really does screw things when transfers may or may not happen.

From USBDriver 0.50 there is indeed a working simple possibility to do so. However during my surf stick experiments I noted a problem in blocking mode, which blocked my machine entirely even there was definitely data pending on the input stream. In pratice there seems to be a couple of other problems with the special fields:

SCSIFS seems to swap “alternate” and “interface”.
DeviceFS does not seem to recognize “Noblock”.
USBDriver does not seem to recognize “nopad” and “short”.

So you have to handle this by the program yourself.

Non blocking seems to mandatory to obtain useable result.
Example in BASIC:

DIM IOCTLBlock% 20

REM size must be a multiple of 64/512 + 1
SYS “XOS_Find”, &4F, “Devices#noblock;nopad;bulk;size2049:$.USB15”, 0 TO StreamHandle%
REM NoBlock
!IOCTLBlock%=&40FF0001
!(IOCTLBlock% + 4)=&000000FF
SYS “OS_Args”, 9, StreamHandle%, IOCTLBlock%
!IOCTLBlock%=&80FF0001
!(IOCTLBlock% + 4)=&00000001
SYS “OS_Args”, 9, StreamHandle%, IOCTLBlock%
REM Nopad
SYS “DeviceFS_CallDevice”, &80000007, “USB15”, StreamHandle% TO ,,,,, USBInputStreamHandle%
SYS “DeviceFS_CallDevice”, &80000008, “USB15”, USBInputStreamHandle%, &00000001, &FFFFFFFE