LimeSDR-mini FIR Setting

Nelson · 6 December 2021 16:36

HI.

I use C++ to control the LimeSDR. Now I am trying to set a FIR for my LimeSDR

	LMS_SetLPFBW(device, LMS_CH_TX, 0, 10e6);
	LMS_SetLPFBW(device, LMS_CH_RX, 0, 1.5e6);

	LMS_SetLPF(device, LMS_CH_TX, 0, true);
	LMS_SetLPF(device, LMS_CH_RX, 0, true);

	LMS_SetGFIR(device, LMS_CH_TX, 0, LMS_GFIR3, true);
	LMS_SetGFIR(device, LMS_CH_RX, 0, LMS_GFIR3, true);
   

	LMS_SetGFIRLPF(device, LMS_CH_TX, 0, true, 10e6);
	LMS_SetGFIRLPF(device, LMS_CH_RX, 0, true, 1.5e6);
   
    LMS_Calibrate(device, LMS_CH_TX, 0, 2.5e6, 0);
    LMS_Calibrate(device, LMS_CH_RX, 0, 2.5e6, 0);

I am not sure this is right or not.
And GFIRLPF always show that GFIR LPF connect be set to the requested bandwidth.
What I want to do is using FIR to decrease the noise from the Antenna. The Sensor I use is a bit sensitivity, The result is good with cable, but when I add antenna into the system, the I cannot get the result. So, I guess it’s the noise problems.

Also, I cannot find the LimeSDR C++ API document, I have no idea the value that can set for LPF.

Anyone can help me? Thank you very much.

Also, Where is thee DC corrector on C++ library?

yt7pwr · 6 December 2021 19:12

GFIR: set only LMS_SetGFIRLPF with BW=0 to disable GFIR or BW=0-100% of sample rate for auto enable with desired BW (for example: 0.1*1e6 is 100KHz GFIR bandwidth)
Calibration: LMS_Calibrate minimum BW is 5e6 (5MHz), if you set less Limesuite dll will auto correct
API exported function list (with detailed explanation):

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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Parameters list:

github.com

myriadrf/LimeSuite/blob/a45e482dad28508d8787e0fdc5168d45ac877ab5/src/lime/LMS7002M_parameters.h

/**
@file	LMS7002M_parameters.h
@author Lime Microsystems (www.limemicro.com)
@brief 	List of LMS7002M transceiver control parameters
*/

#ifndef LMS7002M_PARAMETERS_H
#define LMS7002M_PARAMETERS_H
#include <stdint.h>

#ifdef __cplusplus
extern "C" {
#endif

#define LMS7param(id) LMS7_ ## id

struct LMS7Parameter
{
    uint16_t address;
    uint8_t msb;

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