NXP Semiconductors
UM11490
Feature Configuration Guide for NXP-based Wireless Modules on i.MX 8M Quad EVK
2.9.2 Transmit power enable
This section provides the steps to enable transmit (Tx) power.
Step 1 - Edit the configuration file
The Tx power levels are set with
txpwrlimit_2g_cfg_set
and
txpwrlimit_5g_cfg _set
data structures defined in
txpwrlimit_cfg.conf
configuration
file.
Use the configuration file to specify the transmit power levels for the frequency, channels,
power and channel-width.
Step 2 - Convert the configuration file
The TX power configuration file
txpwrlimit_cfg.conf
must be converted to a binary (
.bin
)
format so the wireless driver can use it.
The following command uses
mlanutl
utility stored at the following location:
/usr/share/
nxp_wireless/bin_mxm_wifiex/
to convert the configuration file to a bin format.
mlanutl <wireless interface> hostcmd <conf_file_name> generate_raw
<bin_file_name>
•
<wireless interface>
is the wireless interface used in the system, for example
mlan0
•
<conf_file_name>
is the name of Tx power configuration file
•
<bin_file_name>
is the name of the output bin file to be generated
Example
root@imx8mqevk:~# ./mlanutl mlan0 hostcmd txpwrlimit_cfg_8987.conf
generate_raw txpower_US.bin
returns:
root@imx8mqevk:~# ./mlanutl mlan0 hostcmd ./config/
txpwrlimit_cfg.conf generate_raw txpower_US.bin
Copy
the newly generated binary files into the wireless firmware directory. For Linux
systems, the directory is:
/lib/firmware/nxp
.
Step 3 - Load Tx power table configuration
The Tx Power table binary file is activated during the wireless driver load time. In the
following example, the driver loads
txpower_US.bin
using
txpwrlimit_cfg
parameter:
root@imx8mqevk:~# nano /lib/firmware/nxp/wifi_mod_para_sd8987.conf
SD8987 = {
cfg80211_wext=0xf
wfd_name=p2p
cal_data_cfg=none
max_vir_bss=1
fw_name=nxp/sdiouart8987_combo_v0.bin
txpwrlimit_cfg=nxp/txpower_US.bin
}
Run the following command to load the module:
root@imx8mqevk:~# modprobe moal mod_para=nxp/wifi_mod_para_sd8987.conf
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
40 / 88
