65 lines
3.0 KiB
Plaintext
65 lines
3.0 KiB
Plaintext
/*!
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*****************************************************************************
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@file: AD5940_LpLoop.c
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@author: Neo Xu
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@brief: Example of using low power loop amplifiers and LPDAC.
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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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/**
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* Note: This example will use LP loop to output voltage on RE0 pin.
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* LPDAC reference: internal 2.5V
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* LP PA(potentialstat amplifier) is used to buffer voltage from Vbias which connects to 12bit LPDAC output
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**/
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#include "ad5940.h"
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#include "AD5940.h"
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#include <stdio.h>
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#include "string.h"
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void AD5940_Main(void)
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{
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AFERefCfg_Type ref_cfg;
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LPLoopCfg_Type lp_cfg;
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/* Use hardware reset */
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AD5940_HWReset();
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AD5940_Initialize();
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/* Initialize everything to zero(false/OFF/PowerDown), only turn on what we need */
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AD5940_StructInit(&ref_cfg, sizeof(ref_cfg));
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ref_cfg.LpBandgapEn = bTRUE; /* Enable low power bandgap */
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ref_cfg.LpRefBufEn = bTRUE; /* Enable the low power reference buffer - 2.5V output */
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AD5940_REFCfgS(&ref_cfg); /* Call reference configuration function */
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AD5940_StructInit(&lp_cfg, sizeof(lp_cfg)); /* Reset everything to zero(OFF) */
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/* Configure what we need below */
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lp_cfg.LpDacCfg.LpdacSel = LPDAC0;
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lp_cfg.LpDacCfg.DacData12Bit = 0x800; /* Output midscale voltage (0.2V + 2.4V)/2 = 1.3V */
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lp_cfg.LpDacCfg.DacData6Bit = 0; /* 6Bit DAC data */
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lp_cfg.LpDacCfg.DataRst =bFALSE; /* Do not keep DATA registers at reset status */
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lp_cfg.LpDacCfg.LpDacSW = LPDACSW_VBIAS2PIN|LPDACSW_VZERO2PIN;//LPDACSW_VBIAS2LPPA|LPDACSW_VBIAS2PIN|LPDACSW_VZERO2LPTIA|LPDACSW_VZERO2PIN;
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lp_cfg.LpDacCfg.LpDacRef = LPDACREF_2P5; /* Select internal 2.5V reference */
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lp_cfg.LpDacCfg.LpDacSrc = LPDACSRC_MMR; /* The LPDAC data comes from MMR not WG in this case */
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lp_cfg.LpDacCfg.LpDacVbiasMux = LPDACVBIAS_12BIT; /* Connect Vbias signal to 12Bit LPDAC output */
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lp_cfg.LpDacCfg.LpDacVzeroMux = LPDACVZERO_6BIT; /* Connect Vzero signal to 6bit LPDAC output */
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lp_cfg.LpDacCfg.PowerEn = bTRUE; /* Power up LPDAC */
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lp_cfg.LpAmpCfg.LpAmpSel = LPAMP0;
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lp_cfg.LpAmpCfg.LpAmpPwrMod = LPAMPPWR_NORM; /* Set low power amplifiers to normal power mode */
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lp_cfg.LpAmpCfg.LpPaPwrEn = bTRUE; /* Enable LP PA(potentialstat amplifier) power */
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lp_cfg.LpAmpCfg.LpTiaPwrEn = bFALSE; /* Leave LPTIA power off */
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lp_cfg.LpAmpCfg.LpTiaSW = LPTIASW(12)|LPTIASW(15)|LPTIASW(4); /* Close these switches to make sure LP PA amplifier is closed loop */
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AD5940_LPLoopCfgS(&lp_cfg);
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AD5940_LPDAC0WriteS(0x800,31);
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while(1);
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}
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