CSR v3.2 Manuale Utente

 

 

 
 
 

Operation 

 

blab-ug-005Pa 

© Cambridge Silicon Radio Limited 2005 

This material is subject to CSR’s non-disclosure agreement. 

Page 17 of 24

 

 

The actions performed by the buttons change dynamically, depending on the current mode of operation. 

These modes of operation are active when there is no media stream active or whenever an HSP/HFP operation 
is performed while a media stream is active. These operations suspend the audio stream until the operation is 
complete. At this point, the media stream continues to play. 

When initiating a Service Level Connection (SLC), the application will tries to connect using the HFP profile. If the 
handset does not support HFP, it tries HSP and, if that fails, the attempt to connect is aborted.  

When the handset is connecting to the headset it accepts the connection for whatever profile the handset 
chooses. 

It should be noted the CVC (Acoustic Echo Canceller and Noise Reduction) DSP algorithm can be compiled for 
inclusion into the 

av_headset_hfp

 reference application. Refer to section 5.3 for compile instructions (default 

is CVC disabled). 

This mode of operation is active whenever a media stream is active. 

To power the headset on, hold down the 

 (

) button for at least two seconds. 

To power the headset off, hold down the 

 (

) button for at least four seconds. The headset will only 

completely power down from that point when all current connections are closed, or a further timeout of five 
seconds occurs. 

Table 7.1, Table 7.2 and Table 7.3 define the button functionality while the headset is in the different operation 
modes. 

! 

Long press - Button held for more than two seconds 

! 

Short press - Button held for less than two seconds