92 lines
2.8 KiB
C
92 lines
2.8 KiB
C
/*
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* Licensed to the OpenAirInterface (OAI) Software Alliance under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The OpenAirInterface Software Alliance licenses this file to You under
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* the OAI Public License, Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.openairinterface.org/?page_id=698
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*-------------------------------------------------------------------------------
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* For more information about the OpenAirInterface (OAI) Software Alliance:
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* contact@openairinterface.org
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*/
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#include "openair0_lib.h"
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#include "gain_control.h"
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//#define DEBUG_PHY
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#ifdef DEBUG_PHY
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#include "UTIL/LOG/log_extern.h"
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#endif
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void gain_control_all (unsigned int rx_power_fil_dB, unsigned int card) {
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unsigned int ant;
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for (ant=0; ant<4; ant++)
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gain_control (rx_power_fil_dB,ant,card);
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}
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void gain_control (unsigned int rx_power_fil_dB, unsigned int ant, unsigned int card) {
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exmimo_config_t *p_exmimo_config = openair0_exmimo_pci[card].exmimo_config_ptr;
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unsigned int rf_mode, rx_gain, LNA;
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rx_gain = p_exmimo_config->rf.rx_gain[ant][0];
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rf_mode = p_exmimo_config->rf.rf_mode[ant];
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LNA = rf_mode & LNAGAINMASK;
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// Gain control with hysterisis
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if (rx_power_fil_dB < TARGET_RX_POWER_MIN) { //increase gain
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switch (LNA) {
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case LNAByp:
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p_exmimo_config->rf.rf_mode[ant] = (rf_mode & (~LNAGAINMASK)) | LNAMed;
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break;
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case LNAMed:
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p_exmimo_config->rf.rf_mode[ant] = (rf_mode & (~LNAGAINMASK)) | LNAMax;
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break;
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case LNAMax:
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p_exmimo_config->rf.rx_gain[ant][0] = min(30,rx_gain+5);
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break;
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default:
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break;
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}
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} else if (rx_power_fil_dB > TARGET_RX_POWER_MAX) { //decrease gain
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if (rx_gain==0) {
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switch (LNA) {
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case LNAMax:
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p_exmimo_config->rf.rf_mode[ant] = (rf_mode & (~LNAGAINMASK)) | LNAMed;
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break;
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case LNAMed:
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p_exmimo_config->rf.rf_mode[ant] = (rf_mode & (~LNAGAINMASK)) | LNAByp;
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break;
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case LNAByp:
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break;
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default:
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break;
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}
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} else {
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p_exmimo_config->rf.rx_gain[ant][0] = max(0,(int)rx_gain-5);
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}
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}
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#ifdef DEBUG_PHY
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LOG_D(PHY,"AGC for chain %d: rx_power_fil_dB=%d, rx_gain=%d, LNA=%d (1=Byp,2=Med,3=Max)\n",ant,rx_power_fil_dB,p_exmimo_config->rf.rx_gain[ant][0],(p_exmimo_config->rf.rf_mode[ant]&LNAGAINMASK)>>14);
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#endif //DEBUG_PHY
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}
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