DVK-BTM521 Laird Technologies, DVK-BTM521 Datasheet - Page 69

• Manufacturer Part Number: DVK-BTM521
• Description: BT MM DEV KIT
• Manufacturer: Laird Technologies
• Type: Transceiver, Bluetoothr

Specifications of DVK-BTM521

• Frequency: 2.4GHz
• Interface Type: RS-232
• Processor Series: BTM521
• Silicon Manufacturer: Laird Technologies
• Kit Application Type: Communication & Networking
• Application Sub Type: Bluetooth
• Kit Contents: Development Board & Software Tools
• Features: Supports CSR
• Rohs Compliant: Yes
• For Use With/related Products: BTM521
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant
• Other names: DVK-BTM521

BTM520/521
Bluetooth
AT COMMAND SET
REFERENCE
69 www.lairdtech.com
®
Multimedia Plus Module
7.2 Audio Gateway Role (AG-HFP / HFG)
Audio gateway role is activated by setting flag 0x40 in S102 plus “AT&W” plus “atz“. Please refer
to Figure 3.23 (page 58) for a block diagram of an audio gateway with a BTM5xx in hosted
operation mode.
Table 3.28 shows the feature requirements for this profile and the level of support on BTM5xx. It is
highly recommended to download the profile specification [5] in order to understand the
procedures related to a certain AT command. For quick navigation, references to [5] are given in
this section which follow the syntax:
#<Feature>_<Section>
With:
<Feature> = HFP feature no. in Table 3.28 and Table 3.1 of [5]
<Section> = Appropriate Section in [5]
Example:
7.2.1 Initiate Service Level Connection (SLC) from AG (#1_4.2)
7.2.2 Initiate Audio Connection from AG (#3_4.11)
7.2.3 Release Audio Connection from AG (#3_4.12)
AT+HFGD<bd_addr
Initiate service level connection (SLC) from local audio gateway instance to remote device
with <bd_addr
Hands-free profile (HFP).
Response:
SLC established: <cr,lf>CONNECT 123456789012,111E,><cr,lf>
Failed:
Or:
Or:
After an SLC connection has been established, the module remains in AT command mode.
S Register 531 is ignored for HFP connections.
AT+HFGA
Initiate audio connection from local audio gateway instance. An existing service level
connection is required.
Response:
Audio on:
This command is not permitted to be issued in a call setup state (incoming / dialling /
alerting, ATI66 = 5 or 6) and will return with ERROR 63 in that case.
AT+HFGR
Release audio connection only. The service level connection will be retained.
Response:
Audio off:
This command is not permitted to be issued in a call setup state (incoming / dialling /
alerting, ATI66 = 5 or 6) and will return with ERROR 63 in that case.
#3_4.12
feature no. = 3, section = 4.12
<cr,lf>ERROR 59<cr,lf>
<cr,lf>ERROR 63<cr,lf>
hex
>. The remote device must support the Hands-free role (HF) of the
<cr,lf>NO CARRIER<cr,lf>
<cr,lf>HFG”AU1”<cr,lf>
<cr,lf>HFG”AU0”<cr,lf>
hex
>
Laird Technologies