84 lines
3.2 KiB
C
84 lines
3.2 KiB
C
/*!
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*****************************************************************************
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@file: AD5940_DFTPolling.c
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@author: Neo Xu
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@brief: DFT Polling mode example.
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-----------------------------------------------------------------------------
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Copyright (c) 2017-2019 Analog Devices, Inc. All Rights Reserved.
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This software is proprietary to Analog Devices, Inc. and its licensors.
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By using this software you agree to the terms of the associated
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Analog Devices Software License Agreement.
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*****************************************************************************/
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#include "ad5940.h"
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#include "stdio.h"
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#include "math.h"
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/**
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* Note: In order to use on-chip DFT engine, WG must be set to SIN wave generator and enable it.
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*/
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void AD5940_Main(void)
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{
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DSPCfg_Type dsp_cfg;
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WGCfg_Type wg_cfg;
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/* Use hardware reset */
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AD5940_HWReset();
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/* Firstly call this function after reset to initialize AFE registers. */
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AD5940_Initialize();
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/* Configure AFE power mode and bandwidth */
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AD5940_AFEPwrBW(AFEPWR_LP, AFEBW_250KHZ);
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AD5940_StructInit(&dsp_cfg, sizeof(dsp_cfg));
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/* Initialize ADC basic function */
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dsp_cfg.ADCBaseCfg.ADCMuxP = ADCMUXP_VCE0;
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dsp_cfg.ADCBaseCfg.ADCMuxN = ADCMUXN_VSET1P1;
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dsp_cfg.ADCBaseCfg.ADCPga = ADCPGA_1;
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/* Initialize ADC filters ADCRawData-->SINC3-->SINC2+NOTCH */
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dsp_cfg.ADCFilterCfg.ADCSinc3Osr = ADCSINC3OSR_4;
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dsp_cfg.ADCFilterCfg.ADCSinc2Osr = ADCSINC2OSR_1333;
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dsp_cfg.ADCFilterCfg.ADCAvgNum = ADCAVGNUM_2; /* Don't care about it. Average function is only used for DFT */
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dsp_cfg.ADCFilterCfg.ADCRate = ADCRATE_800KHZ; /* If ADC clock is 32MHz, then set it to ADCRATE_1P6MHZ. Default is 16MHz, use ADCRATE_800KHZ. */
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dsp_cfg.ADCFilterCfg.BpNotch = bTRUE; /* SINC2+Notch is one block, when bypass notch filter, we can get fresh data from SINC2 filter. */
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dsp_cfg.ADCFilterCfg.BpSinc3 = bFALSE; /* We use SINC3 filter. */
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dsp_cfg.ADCFilterCfg.Sinc2NotchEnable = bTRUE; /* Enable the SINC2+Notch block. You can also use function AD5940_AFECtrlS */
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dsp_cfg.DftCfg.DftNum = DFTNUM_16384;
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dsp_cfg.DftCfg.DftSrc = DFTSRC_SINC3;
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AD5940_DSPCfgS(&dsp_cfg);
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AD5940_StructInit(&wg_cfg, sizeof(wg_cfg));
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wg_cfg.WgType = WGTYPE_SIN;
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wg_cfg.SinCfg.SinFreqWord = AD5940_WGFreqWordCal(1000.0, 16000000.0); /* 10kHz */
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AD5940_WGCfgS(&wg_cfg);
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/* Enable all interrupt at Interrupt Controller 1. So we can check the interrupt flag */
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AD5940_INTCCfg(AFEINTC_1, AFEINTSRC_ALLINT, bTRUE);
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AD5940_AFECtrlS(AFECTRL_ADCPWR|AFECTRL_SINC2NOTCH|AFECTRL_WG, bTRUE);
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AD5940_AFECtrlS(AFECTRL_DFT, bTRUE);
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AD5940_ADCConvtCtrlS(bTRUE);
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while(1)
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{
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int32_t real, image;
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if(AD5940_INTCTestFlag(AFEINTC_1,AFEINTSRC_DFTRDY))
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{
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AD5940_INTCClrFlag(AFEINTSRC_DFTRDY);
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real = AD5940_ReadAfeResult(AFERESULT_DFTREAL);
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if(real&(1<<17))
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real |= 0xfffc0000; /* Data is 18bit in two's complement, bit17 is the sign bit */
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printf("DFT: %d,", real);
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image = AD5940_ReadAfeResult(AFERESULT_DFTIMAGE);
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if(image&(1<<17))
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image |= 0xfffc0000; /* Data is 18bit in two's complement, bit17 is the sign bit */
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printf("%d,", image);
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printf("Mag:%f\n", sqrt((float)real*real + (float)image*image));
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}
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}
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}
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