// File: Impedance.h
#ifndef _IMPEDANCESEQUENCES_H_
#define _IMPEDANCESEQUENCES_H_
#include "ad5940.h"
#include <stdio.h>
#include "string.h"
#include "math.h"

typedef struct
{
/* Common configurations for all kinds of Application. */
  BoolFlag bParaChanged;        /* Indicate to generate sequence again. It's auto cleared by AppBIAInit */
  uint32_t SeqStartAddr;        /* Initialaztion sequence start address in SRAM of AD5940  */
  uint32_t MaxSeqLen;           /* Limit the maximum sequence.   */
  uint32_t SeqStartAddrCal;     /* Measurement sequence start address in SRAM of AD5940 */
  uint32_t SeqWaitAddr[3];      /* Addresses of the Wait commands in the sequence, used to update delays for frequency changes */
  uint32_t MaxSeqLenCal;
/* Application related parameters */ 
  float ImpODR;                 /*  */
  int32_t NumOfData;            /* By default it's '-1'. If you want the engine stops after get NumofData, then set the value here. Otherwise, set it to '-1' which means never stop. */
  float WuptClkFreq;            /* The clock frequency of Wakeup Timer in Hz. Typically it's 32kHz. Leave it here in case we calibrate clock in software method */
  float SysClkFreq;             /* The real frequency of system clock */
  float AdcClkFreq;             /* The real frequency of ADC clock */
  float RcalVal;                /* Rcal value in Ohm */
  float RtiaVal;                /* Rtia value in Ohm (used for 4-wire calculation) */
  /* Switch Configuration */
  uint32_t DswitchSel;
  uint32_t PswitchSel;
  uint32_t NswitchSel;
  uint32_t TswitchSel;
  uint32_t PwrMod;              /* Control Chip power mode(LP/HP) */
  uint32_t HstiaRtiaSel;        /* Use internal RTIA, select from RTIA_INT_200, RTIA_INT_1K, RTIA_INT_5K, RTIA_INT_10K, RTIA_INT_20K, RTIA_INT_40K, RTIA_INT_80K, RTIA_INT_160K */
  uint32_t ExtRtia;             /* External RTIA switch control/value */
  uint32_t ExcitBufGain;        /* Select from  EXCTBUFGAIN_2, EXCTBUFGAIN_0P25 */     
  uint32_t HsDacGain;           /* Select from  HSDACGAIN_1, HSDACGAIN_0P2 */
  uint32_t HsDacUpdateRate;
  float DacVoltPP;              /* DAC output voltage in mV peak to peak. Maximum value is 800mVpp. Peak to peak voltage  */
  float BiasVolt;               /* The excitation signal is DC+AC. This parameter decides the DC value in mV unit. 0.0mV means no DC bias.*/
  float SinFreq;                /* Frequency of excitation signal */
  uint32_t DftNum;              /* DFT number */
  uint32_t DftSrc;              /* DFT Source */
  BoolFlag HanWinEn;            /* Enable Hanning window */
  uint32_t AdcPgaGain;          /* PGA Gain select from GNPGA_1, GNPGA_1_5, GNPGA_2, GNPGA_4, GNPGA_9 !!! We must ensure signal is in range of +-1.5V which is limited by ADC input stage */   
  uint8_t ADCSinc3Osr;
  uint8_t ADCSinc2Osr;  
  uint8_t ADCAvgNum;
  /* Sweep Function Control */
  SoftSweepCfg_Type SweepCfg;
  uint32_t FifoThresh;           /* FIFO threshold. Should be N*4 */
/* Private variables for internal usage */
  float SweepCurrFreq;
  float SweepNextFreq;
  float FreqofData;                         /* The frequency of latest data sampled */
  BoolFlag IMPInited;                       /* If the program run firstly, generated sequence commands */
  SEQInfo_Type InitSeqInfo;
  SEQInfo_Type MeasureSeqInfo;
  BoolFlag StopRequired;          /* After FIFO is ready, stop the measurement sequence */
  uint32_t FifoDataCount;         /* Count how many times impedance have been measured */
}AppIMPCfg_Type;

#define IMPCTRL_START          0
#define IMPCTRL_STOPNOW        1
#define IMPCTRL_STOPSYNC       2
#define IMPCTRL_GETFREQ        3   /* Get Current frequency of returned data from ISR */
#define IMPCTRL_SHUTDOWN       4   /* Note: shutdown here means turn off everything and put AFE to hibernate mode. The word 'SHUT DOWN' is only used here. */

int32_t AppIMPInit(uint32_t *pBuffer, uint32_t BufferSize);
int32_t AppIMPGetCfg(void *pCfg);
int32_t AppIMPISR(void *pBuff, uint32_t *pCount);
int32_t AppIMPCtrl(uint32_t Command, void *pPara);

#endif