AGC on LimeSDR mini

javatai · 27 October 2019 00:51

Hi All:
I am using LimeSDR Mini, I tried check the “Enable AGC” on TRX Gain tab on LimeSuiteGUI, But when I use SoapyUtil --probe to check the AGC is on or not, it shows that Support AGC : No.

Is anything that I am not aware, pls help.

Hardware: LimeSDR Mini V1.2
Software: LimeSuite 19.04.0-Release

Thanks you.

Anson

mzs · 27 October 2019 06:08

Both are right.

In the TSP Rx path of the LMS7002M chip there is the possibility of automatic gain control after the the signal is digital.
https://wiki.myriadrf.org/LimeMicro:LMS7002M_Datasheet#RXTSP_structure
https://wiki.myriadrf.org/LimeMicro:LMS7002M_Datasheet#Automatic_gain_control

And I suspect that Soapy is stating that there is no Support for AGC along the analogue signal path.

javatai · 31 October 2019 02:30

Thanks you, Mzs,

I will check ,.

Cheers

csete · 31 October 2019 21:47

As far as I can see, the limesuite library does not have any high-level API function to enable/disable AGC, so applications and API wrappers will probably have to do this through register I/O.

github.com

myriadrf/LimeSuite/blob/master/src/lime/LimeSuite.h

/**
 * @file lime/LimeSuite.h
 *
 * @brief LMS API library
 *
 * Copyright (C) 2016 Lime Microsystems
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

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