Re: [Bluez-devel] [PATCH] Updated sco flow control feature

Fabien Chevalier
2006-10-23T18:42:05Z

Hello Jose,

The documents i used as reference are the ones from bluetooth SIG. I
don't know who copied the others, but they are closely similar to the
one from IEEE :-)
Concerning SCO flow control over UART link, it is stated nowhere it is
mandatory nor optionnal. :-(

However, having a look at the Bluetooth 2.0+EDR spec (available on
www.bluetooth.com), section 6.26 "Supported commands" describes the
bitmask that lists the supported hci commands for a given
implementation, stating that *It is implied that if a command is listed
as supported, the feature underlying that command is also supported.*

And guess what ?.... in the bitmask there is a bit for the "Write
Synchronous flow control enable" command. ;-)

*** cut here ***
0 Read Hold Mode Activity
1 Write Hold Mode Activity
2 Read Transmit Power Level
3 Read Synchronous Flow Control Enable
10
4 Write Synchronous Flow Control Enable
5 Set Host Controller To Host Flow Control
6 Host Buffer Size
7 Host Number Of Completed Packets
*** cut here ***

Having analysed all these informations, my guess is that it is
synchronous flow control is 'optionnal', even for uart links.

Cheers,