ads1248.h

#ifndef ADS1248_H
#define ADS1248_H
 
// ADC commands:
#define ADC_WAKE 0b00000000
#define ADC_SYNC 0b00000100
#define ADC_RESET 0b00000110
#define ADC_RDATA 0b00010010
#define ADC_RDATAC 0b00010100
#define ADC_SDATAC 0b00010110
#define ADC_SELFOCAL 0b01100010
#define ADC_NOP 0b11111111
#define ADC_NOP24 0xFFFFFF
#define ADC_RREG 0b0010
#define ADC_WREG 0b0100
 
// ADC registers:
#define ADC_REG_MUX0 0x0
#define ADC_REG_VBIAS 0x1
#define ADC_REG_MUX1 0x2
#define ADC_REG_SYS0 0x3
#define ADC_REG_OFC0 0x4
#define ADC_REG_OFC1 0x5
#define ADC_REG_OFC2 0x6
#define ADC_REG_FSC0 0x7
#define ADC_REG_FSC1 0x8
#define ADC_REG_FSC2 0x9
#define ADC_REG_IDAC0 0xA
#define ADC_REG_IDAC1 0xB
#define ADC_REG_GPIOCFG 0xC
#define ADC_REG_GPIODIR 0xD
#define ADC_REG_GPIODAT 0xE
 
// System monitoring functions
#define ADC_MUX1_NORMAL 0x0
#define ADC_MUX1_OFFCAL 0x1
#define ADC_MUX1_GAINCAL 0x2
#define ADC_MUX1_TEMP 0x3
#define ADC_MUX1_REF1 0x4
#define ADC_MUX1_REF0 0x5
#define ADC_MUX1_ASMON 0x6
#define ADC_MUX1_DSMON 0x7
 
// Conversion
#define ADC_TEMP_CONV 0.405
#define ADC_TEMP_25C 118.
 
#include <iostream>
#include <utility> // std::pair
 
#include "nanopi.h"

class Ads1248
{
public:
   Ads1248(NanoPi &np, int cs) : nanoPi(&np), cselect(cs)
   {
      if (!np.HasSPI() || !np.HasGPIO())
         std::cout << "SPI/GPIO not yet initialized!" << std::endl;
      if (gverbose)
         std::cout << "Ads1248::cselect = " << cselect << ", nanoPi = " << nanoPi << std::endl;
   };

   void Reset() { nanoPi->Exch8(cselect, ADC_RESET); }
   void StopC() { nanoPi->Exch8(cselect, ADC_SDATAC); }
   uint8_t ReadReg(uint8_t reg);                            
   void WriteReg(uint8_t reg, uint8_t data);                
   int32_t ReadData();                                      
   bool SetCh(unsigned short ch0, unsigned short ch1);      
   bool SetGainRate(int gain, int rate);                    
   std::pair<unsigned short, unsigned short> GetGainRate(); 
   double GetVal(double data)
   {
      double adc2val = 2. * vref / ampLSB / double(gainrate.first) * cgain;
      return adc2val * data;
   };

   void SetCGain(double g) { cgain = g; }
   void SetResist(double r)
   {
      resist = r;
      cgain = 1e9 / resist;
   }

   void SetVref(double v) { vref = v; }
   double GetTemp(unsigned short n = 5);
 
private:
   uint32_t bits = 0;
   NanoPi *nanoPi = NULL;
   const int cselect;
#ifdef DEBUG
   bool verbose = true;
#else
   bool verbose = false;
#endif
#ifdef REV0
   double resist = 40.2e3;
   double vref = 4.096;
#else
   double resist = 30.0e3;
   double vref = 2.5;
#endif
   double cgain = 1. / resist;
   const uint32_t ampLSB = 1 << 24;
   std::pair<unsigned short, unsigned short> gainrate = std::pair<unsigned short, unsigned short>(1, 5); /* default settings */
   std::pair<unsigned short, unsigned short> GetGainRate(uint8_t readback);                              // return (gain, rate) in real units (rate in Hz)
};
#endif
 
/* emacs
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 * tab-width: 8
 * c-basic-offset: 3
 * indent-tabs-mode: nil
 * End:
 */