source: ResearchApps/PHY/WARPLAB/WARPLab7/Sysgen_Reference/w3/warplab_agc_v3/w3_warplab_agc_init.m

% Load data from capture
%
% xlLoadChipScopeData('../wlan_phy_rx/cs_capt/wlan_cs_capt_5.prn'); cs_interp = 1; cs_start = 1;
% payload_vec = [zeros(25,1); complex(ADC_I(cs_start:cs_interp:end), ADC_Q(cs_start:cs_interp:end));];

% Sinusoid test vector
%
% ts_tx       = 1 / 40e6;
% t           = [0:ts_tx:(10000 * ts_tx)].';                    % Create time vector (Sample Frequency is ts_tx (Hz))
% sinusoid    = 0.2 * exp(j*2*pi * 5e6 * t);                    % Create  5 MHz sinusoid
% payload_vec = [sinusoid];

% No test vector
%
payload_vec = 0;

raw_rx_I.time = [];
raw_rx_Q.time = [];

DCO_I = 0.05;
DCO_Q = 0;
G_I = 2;
G_Q = 2;

raw_rx_I.signals.values = DCO_I + G_I*real(payload_vec);
raw_rx_Q.signals.values = DCO_Q + G_Q*imag(payload_vec);


PHY_CONFIG_PKT_DET_CORR_THRESH   = 90;
PHY_CONFIG_PKT_DET_ENERGY_THRESH = 14;
PHY_CONFIG_PKT_DET_MIN_DURR      = 4;

%% Register Init

% Timing registers
AGC_TIMING_CAPT_RSSI_1       = 1;
AGC_TIMING_CAPT_RSSI_2       = 30;
AGC_TIMING_CAPT_V_DB         = 90;
AGC_TIMING_DONE              = 96;

AGC_TIMING_START_DCO         = 100;
AGC_TIMING_EN_IIR_FILT       = 100 + 34;

AGC_TIMING_RESET_RXHP        = 4;
AGC_TIMING_RESET_G_RF        = 250;
AGC_TIMING_RESET_G_BB        = 250;

% Config register
AGC_G_RF_THRESH_32           = 256 - 56;         % Reinterpret Fix8_0 to UFix8_0
AGC_G_RF_THRESH_21           = 256 - 37;         % Reinterpret Fix8_0 to UFix8_0
AGC_RSSI_AVG_LEN_SEL         = 2;
AGC_V_DB_ADJ                 = 4;                % Reinterpret Fix6_0 to UFix6_0
AGC_INIT_G_BB                = 24;

% Target register
AGC_TARGET_PWR               = 64 - 16;          % Reinterpret Fix6_0 to UFix6_0

% IIR filt coefficients
DCO_IIR_Coef_A1              = -0.996863331833438;
DCO_IIR_Coef_B0              =  0.99843166591671906;

% Rx Power - RSSI calib register (-power values in dBm)
RSSI_MIN_PWR_G_RF_3          = 100;
RSSI_MIN_PWR_G_RF_2          = 85;
RSSI_MIN_PWR_G_RF_1          = 70;

% Register initial values
REG_ACG_OVERRIDE             = hex2dec('00000000');
REG_AGC_RESET_MODE           = hex2dec('00000001');
REG_AGC_RX_LENGTH            = hex2dec('FFFFFFFF');

REG_AGC_Timing_AGC = ...
    2^0  * AGC_TIMING_CAPT_RSSI_1 + ...          % UFix8_0
    2^8  * AGC_TIMING_CAPT_RSSI_2 + ...          % UFix8_0
    2^16 * AGC_TIMING_CAPT_V_DB   + ...          % UFix8_0
    2^24 * AGC_TIMING_DONE;                      % UFix8_0

REG_AGC_Timing_DCO = ...
    2^0 * AGC_TIMING_START_DCO   + ...           % UFix8_0
    2^8 * AGC_TIMING_EN_IIR_FILT + ...           % UFix8_0
    0;

REG_AGC_Timing_Reset = ...
    2^0  * AGC_TIMING_RESET_RXHP + ...           % UFix8_0
    2^8  * AGC_TIMING_RESET_G_RF + ...           % UFix8_0
    2^16 * AGC_TIMING_RESET_G_BB + ...           % UFix8_0
    0;

REG_AGC_Config = ...
    2^0  * AGC_G_RF_THRESH_32   + ...            % Fix8_0
    2^8  * AGC_G_RF_THRESH_21   + ...            % Fix8_0
    2^16 * AGC_RSSI_AVG_LEN_SEL + ...            % UFix2_0
    2^18 * AGC_V_DB_ADJ         + ...            % Fix6_0
    2^24 * AGC_INIT_G_BB        + ...            % UFix5_0
    0;

REG_AGC_Target               = AGC_TARGET_PWR;

REG_AGC_IIR_Coef_A1          = DCO_IIR_Coef_A1;
REG_AGC_IIR_Coef_B0          = DCO_IIR_Coef_B0;

REG_AGC_RSSI_RX_PWR_CALIB = ...
    2^0  * RSSI_MIN_PWR_G_RF_3 + ...             % UFix8_0
    2^8  * RSSI_MIN_PWR_G_RF_2 + ...             % UFix8_0
    2^16 * RSSI_MIN_PWR_G_RF_1 + ...             % UFix8_0
    0;