NXP Semiconductors
UM11490
Feature Configuration Guide for NXP-based Wireless Modules on i.MX 8M Quad EVK
4.3 Hands-free profile (HFP)
This section introduces the Ofono package used to dial, hang-up and answer telephone
calls, and details the configuration for the hands-free profile.
4.3.1 Ofono package
Ofono package
Ofono provides a mobile telephony application development framework with minimal and
easy-to-use APIs. Ofono is controlled through D-Bus.
ofonod is the daemon that provides the Ofono stack for interfacing mobile telephony
devices. For example, one can tell ofonod to send AT commands over /dev/rfcomm0 by
calling the D-Bus method org.ofono.at.Manager.Create.
Table 4 describes the AT commands used to dial, hang-up and answer the calls:
command Description
ATA Command used to answer a call
ATD Command used to place a call to a phone number
AT+CHUP Command used to hang up. This command causes the AG to end
an active call
Table 4. Hands-free profile AT commands
For more information on AT commands refer to the Hands-Free Profile Specification.
4.3.2 Hands-free profile configuration
Step 1 - Enable the host interface
• 88W8987: Use imx8mq-evk-usdhc2-m2.dtb file to enable SDIO on M.2 connector
• 88W8997: Use imx8mq-evk-pcie1-m2.dtb file to enable PCIe on M.2 connector
Note: Refer to UM11483 for details on interface enable.
Step 2 - Stop pulseaudio
If pulseaudio is running, run the command to stop pulseaudio:
root@imx8mqevk:~# killall pulseaudio
Command output example:
pulseaudio: no process found
root@imx8mqevk:~#
Step 3 - Update the sample rate in the configuration file
Edit the configuration file to change the default sample rate to 8000 samples per second:
root@imx8mqevk:~# nano /etc/pulse/daemon.conf
; default-sample-rate = 44100
default-sample-rate = 8000
root@imx8mqevk:~#
UM11490 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2021. All rights reserved.
User manual Rev. 2 — 29 January 2021
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