// File: Amperometric.h
#ifndef _AMPEROMETRIC_H_
#define _AMPEROMETRIC_H_
#include "ad5940.h"
#include "stdio.h"
#include "string.h"
#include "math.h"

#define DAC12BITVOLT_1LSB   (2200.0f/4095)  //mV
#define DAC6BITVOLT_1LSB    (DAC12BITVOLT_1LSB*64)  //mV

typedef struct
{
/* Common configurations for all kinds of Application. */
  BoolFlag bParaChanged;        /* Indicate to generate sequence again. It's auto cleared by AppAMPInit */
  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 MaxSeqLenCal;
  
/* Application related parameters */ 
  BoolFlag ReDoRtiaCal;         /* Set this flag to bTRUE when there is need to do calibration. */
  float SysClkFreq;             /* The real frequency of system clock */
  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 AdcClkFreq;             /* The real frequency of ADC clock */
  uint32_t FifoThresh;           /* FIFO threshold. Should be N*4 */   
  float AmpODR;                 /* in Hz. ODR decides the period of WakeupTimer who will trigger sequencer periodically.*/
  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 RcalVal;                /* Rcal value in Ohm */
  float ADCRefVolt;               /* Measured 1.82 V reference*/
  uint32_t PwrMod;              /* Control Chip power mode(LP/HP) */
  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;          /* SINC3 OSR selection. ADCSINC3OSR_2, ADCSINC3OSR_4 */
  uint8_t ADCSinc2Osr;          /* SINC2 OSR selection. ADCSINC2OSR_22...ADCSINC2OSR_1333 */
  uint32_t DataFifoSrc;         /* DataFIFO source. FIFOSRC_SINC3, FIFOSRC_DFT, FIFOSRC_SINC2NOTCH, FIFOSRC_VAR, FIFOSRC_MEAN*/
  uint32_t LptiaRtiaSel;        /* 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 LpTiaRf;             /* Rfilter select */
  uint32_t LpTiaRl;             /* SE0 Rload select */
  fImpPol_Type RtiaCalValue;           /* Calibrated Rtia value */
  float Vzero;                  /* Voltage on SE0 pin and Vzero, optimumly 1100mV*/
  float SensorBias;             /* Sensor bias voltage = VRE0 - VSE0 */
  BoolFlag ExtRtia;             /* Use internal or external Rtia */
  float ExtRtiaVal;							/* External Rtia value if using one */
  BoolFlag AMPInited;           /* 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 */
  BoolFlag ShortRe0Se0;           /* Short RE0 to SE0 */
/* End */
}AppAMPCfg_Type;

/**
 * int32_t type Impedance result in Cartesian coordinate 
*/
typedef struct
{
  float Current;
  float Voltage;
}fAmpRes_Type;

#define AMPCTRL_START          0
#define AMPCTRL_STOPNOW        1
#define AMPCTRL_STOPSYNC       2
#define AMPCTRL_SHUTDOWN       4   /* Note: shutdown here means turn off everything and put AFE to hibernate mode. The word 'SHUT DOWN' is only used here. */

AD5940Err AppAMPGetCfg(void *pCfg);
AD5940Err AppAMPInit(uint32_t *pBuffer, uint32_t BufferSize);
AD5940Err AppAMPISR(void *pBuff, uint32_t *pCount);
AD5940Err AppAMPCtrl(int32_t AmpCtrl, void *pPara);
float AppAMPCalcVoltage(uint32_t ADCcode);
float AppAMPCalcCurrent(uint32_t ADCcode);

#endif