Bluetooth Audio, HFP, Hands-Free Exercise →Audio Full-Duplex Exercise, Connecting Bluetooth Module as Hands-Free to Cellphone
HFP, HF(Hands-free)
Practice using a mobile phone as an HFP AG(Audio Gateway) and a Bluetooth module as an HF(Hands-Free) device.
Note. A HFP audio channel is bi-directional.
1. Test System Configuration
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| HFP AG | HFP HF | ||
Profile Example
| Decimal | PBAP | HID | AVRCP | A2DP | HFP | GATT | SPP | BT Role | ||||
| TRGT | CTRL | SRC | SNK | AG | HF | CLNT | SVR | |||||
| B10 | B09 | B08 | B07 | B06 | B05 | B04 | B03 | B02 | B01 | B00 | ||
| 11 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 1 | 1 | HF |
| 19 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 1 | 1 | AG |
| 163 | 0 | 0 | 0 | 1 | 0 | 1 | 0 | 0 | 0 | 1 | 1 | Sink |
| 323 | 0 | 0 | 1 | 0 | 1 | 0 | 0 | 0 | 0 | 1 | 1 | Source |
| 117 | 0 | 0 | 0 | 1 | 0 | 1 | 0 | 1 | 0 | 1 | 1 | Sink&HF |
| 339 | 0 | 0 | 1 | 0 | 1 | 0 | 1 | 0 | 0 | 1 | 1 | Source&AG |
2. Command and Response Sequence
| NO | Command | Response | Description |
| Step1: Setting-up HFP HF | |||
| 1 | AT+COD=240404 | OK | Set the device type as hand-free |
| 2 | AT+I2SCFG=0 | OK |
Set the audio output to Analog (BT 1036 built-in CODEC version is required). If the module recognizes codec successfully, feedback +CODEC=ID is received |
| 3 | AT + PROFILE =11 |
OK +GATTSTAT=1 +HFPSTAT=1 +SPPSTAT=1 +VER=FSC-BT80X,V4.3.4,20210625 +DEVSTAT=7 |
Turn on HFP-HF, GATT Sever, SPP |
| Step 2: BT Scan and Paring with AG(Mobile Phone) | |||
| 5 | Pairing with Cellphone |
+PAIRED=948BC1350C63 +HFPSTAT=2 +HFPSIG=4 +HFPROAM=0 +HFPBATT=0 +HFPSTAT=3 +DEVSTAT=5 [+HFPDEV=948BC1350C63,Galaxy S8+ [+HFPNET=LG U+ |
If the connection is normal, It will display “connected as a call”, in the BT registration information. |
| 6 | Call to Cellphone |
+HFPAUDIO=1 +HFPCID=07042108538 +HFPSTAT=5 +HFPCID=07042108538 +HFPCID=07042108538 +HFPSTAT=6 +HFPAUDIO=0 +HFPSTAT=3 |
Call to BT-connected mobile phone, and check the voice in Hands-Free. |
WiFi IoT Module
Bluetooth Module
5G/LTE/CAT-M1/NB-IoT
