User's Manual

Class 1 Bluetooth v2.0 Module
User’s Guide
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CONN-GUIDE-BT730_v0.9
6.3.19 AT&F*{Clear Non-volatile Memory}
The AT&F* variant of the command installs values in S registers as per command AT&F4 and then all
other user parameters in non-volatile memory are erased. This means that the trusted device database is
cleared, as well as parameters related to the following commands: AT+BTR, AT+BTN, AT+BTS.
Response: <cr,lf>OK<cr,lf>
Or
Response: <cr,lf>ERROR nn<cr,lf>
6.3.20 AT&F+{Clear Non-volatile Memory}
This command erases all user parameters in non-volatile memory except S Registers 520 to 525. This
means that the trusted device database is cleared, and so are parameters related to the following
commands:- AT+BTR, AT+BTN, AT+BTS.
Response: <cr,lf>OK<cr,lf>
Or
Response: <cr,lf>ERROR nn<cr,lf>
6.3.21 AT&W{Write S Registers to Non-volatile Memory}
Writes current S Register values to non-volatile memory so that they are retained over a power cycle.
Response: <cr,lf>OK<cr,lf>
Or
Response: <cr,lf>ERROR nn<cr,lf>
6.3.22 AT+BTAn{Control Audio Channel}
Once a Bluetooth connection is active, and assuming the peer device is a Laird device, this command is
used to start/stop a SCO channel which connects the PCM interfaces of the two peer devices. If a codec
is attached to the PCM pins, then 2-way audio can be established.
+BTA0
Switch off the channel.
+BTA1
Switch on the channel.
On receipt of the command, the following response immediately follows.
Response: <cr,lf>OK<cr,lf>
The lower layers then go through the process of setting up the SCO channel. Once a SCO link is
established, the following response is asynchronously sent to the host.
Response: <cr,lf>AUDIO ON<cr,lf>
Or if the SCO failed to be established.
Response: <cr,lf>AUDIO FAIL<cr,lf>
On the peer device, the host will asynchronously get ….
Response: <cr,lf>AUDIO ON<cr,lf>