rpi-ads8689.hpp

#pragma once

#include <bcm2835.h>
#include <stdio.h>
#include <time.h>
#include <iostream>
#include <stdexcept>
#include <limits>

namespace ads8689 {
	enum struct Registers: uint8_t{
		NO_OP_REG = 0x00, // No operation Register
		DEVICE_ID_REG_23_16 = 0x02, //Device ID
		RST_PWCTRL_REG_7_0 = 0x04, //Reset and power control
		RST_PWCTRL_REG_15_8 = 0x05, 
		SDI_CTL_REG_7_0	= 0x08, //SDI data input control
		SDO_CTL_REG_7_0 = 0x0C, //SDO-x data input control
		SDO_CTL_REG_15_8 = 0x0D,
		DATAOUT_CTL_REG_7_0 = 0x10, //output data control
		DATAOUT_CTL_REG_15_8 = 0x11,
		RANGE_SEL_REG_7_0 = 0x14, //input range selection control
		ALARM_REG_7_0 = 0x20, //ALARM output register
		ALARM_REG_15_8 = 0x21,
		ALARM_H_TH_REG_7_0 = 0x24, //ALARM high threshold and hystersis register
		ALARM_H_TH_REG_15_8 = 0x25,
		ALARM_H_TH_REG_31_24 = 0x27,
		ALARM_L_TH_REG_7_0 = 0x28, //ALARM low threshold register
		ALARM_L_TH_REG_15_8 = 0x29
	};
	enum struct Commands: uint8_t{
		NOP = 0x00, //send to read current 16 bit value
		CLEAR_HWORD = 0xC0, //any bits marked 1 in data will be set to 0 in register at those positions
		READ_HWORD = 0xC8, //read 16 bits from register
		READ = 0x48, //read 8 bits from register
		WRITE = 0xD0, //write 16 bits to register
		WRITE_MSBYTE = 0xD2, //write 8 bits to register (MS Byte of data)
		WRITE_LSBYTE = 0xD4, //write 8 bits to register (LS Byte of data)
		SET_HWORD = 0xD8 //any bits marked 1 in data will be set to 1 in register at those positions
	};
	enum struct SPIs: bool {
		SPI_0 = 0,
		SPI_AUX = 1,
	};
	enum struct ChipSelects: uint8_t {
		CS0 = BCM2835_SPI_CS0,
		CS1 = BCM2835_SPI_CS1,
		CS2 = BCM2835_SPI_CS2,
		CSManual = BCM2835_SPI_CS_NONE 
	};
	enum References{
		External = 0x0080,
		Internal = 0x0000,
	};
	enum Ranges{
		pm3Vref = 0x0000, //±3*Vref
		pm25Vref = 0x0001, //±2.5*Vref
		pm15Vref = 0x0002, //±2.5*Vref
		pm125Vref = 0x0003, //±1.25*Vref
		pm0625Vref = 0x0004, //±0.625*Vref
		p3Vref = 0x0008, //3*Vref
		p25Vref = 0x0009, //2.5*Vref
		p15Vref = 0x000A, //1.5*Vref
		p125Vref = 0x000B //1.25*Vref	
	};

	const float internalReferenceVoltage = 4.096; //Internal reference value. May be useful for data processing so its public

	class ADS8689{
		public:
			ADS8689(SPIs spi, ChipSelects cs, Ranges range, References reference, double referenceVoltage ); //Internal Reference

			uint16_t sendCommand(Commands command, Registers address, uint16_t data); //Send a Generic Command

			uint16_t readPlainADC(); //Read plain value from ADC
			double readADC();
		private:
			SPIs spi;
			ChipSelects cs;
			References reference;
			Ranges range;
			double referenceVoltage;
	};

}