Ads1248 Class Reference

Class interfacing the TI ADS1248 ADC chip. More...

#include <ads1248.h>

Public Member Functions
	Ads1248 (NanoPi &np, int cs)
	Constructor.
void	Reset ()
	Reset registers to default values.
void	StopC ()
	Turn off continuous data readout.
uint8_t	ReadReg (uint8_t reg)
	Read register.
void	WriteReg (uint8_t reg, uint8_t data)
	Write register.
int32_t	ReadData ()
	Read data from ADC.
bool	SetCh (unsigned short ch0, unsigned short ch1)
	Select which inputs to measure between.
bool	SetGainRate (int gain, int rate)
	Set gain (0..7) and rate (0..9) settings, see manual.
std::pair< unsigned short, unsigned short >	GetGainRate ()
	Return (gain, rate) in real units (rate in Hz)
double	GetVal (double data)
	Convert readout into voltage using set constant.
void	SetCGain (double g)
	Set conversion gain (mutliplied in GetVal())
void	SetResist (double r)
	Convenience function to set conversion gain via load resistor to measure current.
void	SetVref (double v)
	Set reference voltage applied to ADC.
double	GetTemp (unsigned short n=5)
	Read out chip temperature.

Detailed Description

Class interfacing the TI ADS1248 ADC chip.

This contains everything needed for the SPI communication with an ADS1248 ADC chip,

Constructor & Destructor Documentation

Ads1248()

Ads1248::Ads1248 ( NanoPi & np, int cs )

inline

Constructor.

Parameters

np	An instance of a NanoPi object, needed for the actual hardware communication
cs	SPI channel select addressing the chip in question

Member Function Documentation

GetTemp()

double Ads1248::GetTemp

(

unsigned short

n = 5

)

Read out chip temperature.

Parameters

n	average temperature over n read cycles (default 5)

GetVal()

double Ads1248::GetVal ( double data )

inline

Convert readout into voltage using set constant.

V = 2*Vref/2^24 * cgain/gain

Vref: external reference voltage

gain: ADC gain

cgain: conversion "gain", e.g. amplification after ADC, or conversion to current via load resistor

ReadData()

int32_t Ads1248::ReadData

(

)

Read data from ADC.

Performs READ communication with the ADC and converts the result into a 32-bit integer.

SetGainRate()

bool Ads1248::SetGainRate	(	int	gain,
		int	rate )

Set gain (0..7) and rate (0..9) settings, see manual.

Gain settings:

gain = 2^setting

Setting	Gain
0	1
1	2
2	4
3	8
4	16
5	32
6	64
7	128

Rate settings:

rate = 5Hz * 2^setting up to setting 7, then different

Setting	Rate (Hz)
0	5
1	10
2	20
3	40
4	80
5	160
6	320
7	640
8	1000
9+	2000

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The documentation for this class was generated from the following files:

• include/ads1248.h
• src/ads1248.cc