Unverified Commit 7f0db020 authored by Birte Kristina Friesel's avatar Birte Kristina Friesel
Browse files

Add driver for ADS111x 16-Bit ADC

parent 2501cd66

Makefile

+4 −0
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@@ -46,6 +46,10 @@ ifdef CONFIG_driver_dummy 
	CXX_TARGETS += src/driver/dummy.cc

endif



ifdef CONFIG_driver_ads111x

	CXX_TARGETS += src/driver/ads111x.cc

endif



ifdef CONFIG_driver_lm75

	CXX_TARGETS += src/driver/lm75.cc

endif

include/driver/ads111x.h

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/*

 * Copyright 2023 Daniel Friesel

 *

 * SPDX-License-Identifier: BSD-2-Clause

 *

 * Driver for ADS111x 16-Bit ADCs

 */

#ifndef ADS111x_H

#define ADS111x_H



class ADS111x {

	private:

		ADS111x(const ADS111x &copy);

		unsigned char const address;

		unsigned char fsr_scale;



		unsigned char txbuf[3];

		unsigned char rxbuf[2];



		unsigned char const P_CONVERSION = 0;

		unsigned char const P_CONFIG = 1;

		unsigned char const P_LO_THRESH = 2;

		unsigned char const P_HI_THRESH = 3;



	public:

		ADS111x(unsigned char const addr) : address(addr), fsr_scale(8) {}



		unsigned short const START_CONVERSION = 1 << 15;

		enum conf_mux : unsigned short {

			DIFFERENTIAL_01 = 0 << 12,

			DIFFERENTIAL_03 = 1 << 12,

			DIFFERENTIAL_13 = 2 << 12,

			DIFFERENTIAL_23 = 3 << 12,

			SINGLE_0 = 4 << 12,

			SINGLE_1 = 5 << 12,

			SINGLE_2 = 6 << 12,

			SINGLE_3 = 7 << 12

		};

		unsigned short const CONF_PGA_MASK = 0b0000111000000000;

		unsigned short const CONF_PGA_OFFSET = 9;

		enum conf_pga : unsigned short {

			FSR_6V = 0 << 9,

			FSR_4V = 1 << 9,

			FSR_2V = 2 << 9,

			FSR_1V = 3 << 9,

			FSR_0V5 = 4 << 9,

			FSR_0V25 = 5 << 9

		};

		enum conf_mode : unsigned short {

			CONTINUOUS = 0 << 8,

			SINGLE_SHORT = 1 << 8,

		};

		enum conf_data_rate : unsigned short {

			SPS_8 = 0 << 5,

			SPS_16 = 1 << 5,

			SPS_32 = 2 << 5,

			SPS_64 = 3 << 5,

			SPS_128 = 4 << 5,

			SPS_250 = 5 << 5,

			SPS_475 = 6 << 5,

			SPS_860 = 7 << 5

		};

		enum conf_comp_mode : unsigned short {

			TRADITIONAL = 0 << 4,

			WINDOW = 1 << 4

		};

		enum conf_comp_pol : unsigned short {

			ACTIVE_LOW = 0 << 3,

			ACTIVE_HIGH = 1 << 3,

		};

		enum conf_comp_lat : unsigned short {

			NONLATCHING = 0 << 2,

			LATCHING = 1 << 2

		};

		enum conf_comp_queue : unsigned short {

			ONE_CONVERSON = 0,

			TWO_CONVERSIONS,

			FOUR_CONVERSIONS,

			DISABLED

		};



		void configure(unsigned short config);

		float readVoltage();

};



extern ADS111x ads111x;



#endif

src/app/datalogger/main.cc

+13 −0
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@@ -13,6 +13,9 @@ 
#include "driver/soft_i2c.h"

#endif



#ifdef CONFIG_driver_ads111x

#include "driver/ads111x.h"

#endif

#ifdef CONFIG_driver_lm75

#include "driver/lm75.h"

#endif
@@ -63,6 +66,12 @@ 


void loop(void)

{

#ifdef CONFIG_driver_ads111x

	kout << "Reading: ";

	kout.printf_float(ads111x.readVoltage());

	kout << " V" << endl;

#endif



#ifdef CONFIG_driver_lm75

	kout << "temperature_celsius: ";

	kout.printf_float(lm75.getTemp());
@@ -284,6 +293,10 @@ int main(void) 
	kout << "I2C setup OK" << endl;

#endif



#ifdef CONFIG_driver_ads111x

	ads111x.configure(ADS111x::CONTINUOUS | ADS111x::FSR_4V | ADS111x::SPS_8 | ADS111x::SINGLE_3);

#endif



#ifdef CONFIG_driver_bme280

	bme280.intf = BME280_I2C_INTF;

	bme280.read = bme680_i2c_read;

src/driver/Kconfig

+4 −0
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@@ -25,6 +25,10 @@ bool 


menu "Drivers"



config driver_ads111x

bool "ADS111x 16-bit ADC"

depends on meta_driver_i2c



config driver_am2320

bool "AM2320 TH Sensor"

depends on meta_driver_i2c

src/driver/ads111x.cc

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/*

 * Copyright 2023 Daniel Friesel

 *

 * SPDX-License-Identifier: BSD-2-Clause

 *

 * Driver for ADS111x 16-Bit ADCs

 */

#include "driver/ads111x.h"

#if defined(CONFIG_meta_driver_hardware_i2c)

#include "driver/i2c.h"

#elif defined(CONFIG_driver_softi2c)

#include "driver/soft_i2c.h"

#endif



#include <stdint.h>



void ADS111x::configure(unsigned short config)

{

	txbuf[0] = P_CONFIG;

	txbuf[1] = config >> 8;

	txbuf[2] = config & 0x00ff;

	i2c.xmit(address, 3, txbuf, 0, rxbuf);



	uint8_t pga_config = (config & CONF_PGA_MASK) >> CONF_PGA_OFFSET;

	switch (pga_config) {

		case 0:

			fsr_scale = 24;

			break;

		case 1:

			fsr_scale = 16;

			break;

		case 2:

			fsr_scale = 8;

			break;

		case 3:

			fsr_scale = 4;

			break;

		case 4:

			fsr_scale = 2;

			break;

		default:

			fsr_scale = 1;

	}

}



float ADS111x::readVoltage()

{

	txbuf[0] = P_CONVERSION;

	i2c.xmit(address, 1, txbuf, 2, rxbuf);



	int16_t intermediate = ((int8_t)rxbuf[0]) * 256 + (uint8_t) rxbuf[1];



	return intermediate * 0.256 / 0x7fff * fsr_scale;

}



ADS111x ads111x(0x48);