WL1837MOD Unable to set TX power to a fixed value

Peter Lindgren

Other Parts Discussed in Thread: WL1837MOD

Hi,

I'm using the AM335 EVM together with WL1837MOD, running the pre-built binaries delivered in the ti-sdk-am335x-evm-08.00.00.00.bin

* Everything looks ok during the kenrel boot
* I'm able to configure and setup a link.

However, I'm not able to control the tx power using a fixed value, using the iw command.

Is this implemented? Verified?

---------- Run sequence.

# iw reg set B0
# wpa_supplicant -d -Dnl80211 -c/etc/wpa_supplicant.conf -iwlan0 -B
# wpa_cli -iwlan0 add_network
# wpa_cli -iwlan0 set_network 0 auth_alg OPEN
# wpa_cli -iwlan0 set_network 0 key_mgmt NONE
# wpa_cli -iwlan0 set_network 0 mode 0
# wpa_cli -iwlan0 set_network 0 ssid '"test"'
# wpa_cli -iwlan0 select network 0
# wpa_cli -iwlan0 enable network 0
# wpa_cli -iwlan0 reassociate
# ifconfig wlan0 192.168.0.101 netmask 255.255.255.0 up
# ping 192.168.0.100 (meassure tx power)
# ifconfig wlan0 down
# iw dev wlan0 set txpower fixed 2000 (also tried with 100)
# iw phy phy0 set txpower fixed 2000 (also tried with 100)
# ifconfig wlan0 192.168.0.101 netmask 255.255.255.0 up
# ping 192.168.0.100 (meassure tx power)

----------

Regards,

Peter

over 9 years ago

0 Peter Lindgren over 9 years ago

Prodigy 40 points

[ 3246.806898] wlcore: PHY firmware version: Rev 8.2.0.0.224
[ 3246.975428] wlcore: firmware booted (Rev 8.9.0.0.31)

0 Peter Lindgren over 9 years ago in reply to Peter Lindgren

Prodigy 40 points

I have also tried the same procedure without success using that latest WiLink8 Release R8.6.
[ 388.441119] wlcore: PHY firmware version: Rev 8.2.0.0.232
[ 388.645091] wlcore: firmware booted (Rev 8.9.0.0.48)

0 Joseph Gigi over 9 years ago in reply to Peter Lindgren

TI__Guru* 85400 points

Hi,

The iw txpower command is not supported. Please see: e2e.ti.com/.../1354656 for modifying the tx power.

Regards,
Gigi Joseph.

0 Peter Lindgren over 9 years ago in reply to Joseph Gigi

Prodigy 40 points

Hi Gigi,

is this a limitation of the linux driver or is this a limitation of the EL1837MOD module firmware?

When enabling the linux driver ACX debug output I can see that the linux driver tries to set the tx power using the DOT11_CUR_TX_PWR command. Also, there is no indication that this command was unsuccessful.

I think this indicates a bug (or missing feature) in the module firmware. Can you please confirm?

We are implementing a custom driver for the WL1837MOD. In some scenarios we would like disable the dynamic tx power feature (described in the link you posted) and manually set the tx power. For instance when implementing 802.11d.

Regards,
Peter

0 Joseph Gigi over 9 years ago in reply to Peter Lindgren

TI__Guru* 85400 points

Hi Peter,

You must use the ini file to modify the Tx power.
"iw reg set <country>" option is supported.

Regards,
Gigi Joseph.

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WL1837MOD Unable to set TX power to a fixed value