0.1.0 AD5248

libraries/AD5248/.arduino-ci.yml

@@ -0,0 +1,27 @@
+platforms:
+  rpipico:
+    board: rp2040:rp2040:rpipico
+    package: rp2040:rp2040
+    gcc:
+      features:
+      defines:
+        - ARDUINO_ARCH_RP2040
+      warnings:
+      flags:
+
+packages:
+  rp2040:rp2040:
+    url: https://github.com/earlephilhower/arduino-pico/releases/download/global/package_rp2040_index.json
+
+compile:
+  # Choosing to run compilation tests on 2 different Arduino platforms
+  platforms:
+    - uno
+    # - due
+    # - zero
+    # - leonardo
+    - m4
+    - esp32
+    - esp8266
+    # - mega2560
+    - rpipico

libraries/AD5248/.github/FUNDING.yml

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+# These are supported funding model platforms
+
+github: RobTillaart
+

libraries/AD5248/.github/workflows/arduino-lint.yml

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+
+name: Arduino-lint
+
+on: [push, pull_request]
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: arduino/arduino-lint-action@v1
+        with:
+          library-manager: update
+          compliance: strict

libraries/AD5248/.github/workflows/arduino_test_runner.yml

@@ -0,0 +1,17 @@
+---
+name: Arduino CI
+
+on: [push, pull_request]
+
+jobs:
+  runTest:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v3
+      - uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: 2.6
+      - run: |
+          gem install arduino_ci
+          arduino_ci.rb

libraries/AD5248/.github/workflows/jsoncheck.yml

@@ -0,0 +1,18 @@
+name: JSON check
+
+on:
+  push:
+    paths:
+      - '**.json'
+  pull_request:
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - name: json-syntax-check
+        uses: limitusus/json-syntax-check@v1
+        with:
+          pattern: "\\.json$"
+

libraries/AD5248/AD5248.cpp

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+//
+//    FILE: AD5248.cpp
+//  AUTHOR: Rob Tillaart
+// VERSION: 0.1.0
+// PURPOSE: Library for I2C digital potentiometer AD5243 + rheostat AD5248
+//    DATE: 2023-12-12
+//     URL: https://github.com/RobTillaart/AD5248
+
+
+#include "AD5248.h"
+
+
+#define AD5248_RDAC0        0x00
+#define AD5248_RDAC1        0x80
+#define AD5248_RESET        0x40
+#define AD5248_SHUTDOWN     0x20
+
+
+AD5248::AD5248(uint8_t address, TwoWire *wire)
+{
+  _address = address;
+  _wire = wire;
+
+  //  power on reset => mid position
+  _lastValue[0] = _lastValue[1] = AD5248_MIDPOINT;
+  _pmCount = 2;
+}
+
+
+bool AD5248::begin()
+{
+  if (! isConnected()) return false;
+  reset();
+  return true;
+}
+
+
+bool AD5248::isConnected()
+{
+  _wire->beginTransmission(_address);
+  return ( _wire->endTransmission() == 0);
+}
+
+
+uint8_t AD5248::reset()
+{
+  write(0, AD5248_MIDPOINT);
+  return write(1, AD5248_MIDPOINT);
+}
+
+
+uint8_t AD5248::zeroAll()
+{
+  write(0, 0);
+  return write(1, 0);
+}
+
+
+uint8_t AD5248::write(const uint8_t rdac, const uint8_t value)
+{
+  if (rdac >= _pmCount) return AD5248_ERROR;
+
+  uint8_t cmd = (rdac == 0) ? AD5248_RDAC0 : AD5248_RDAC1;
+  _lastValue[rdac] = value;
+  return send(cmd, value);
+}
+
+
+uint8_t AD5248::read(const uint8_t rdac)
+{
+  return _lastValue[rdac];
+}
+
+
+uint8_t AD5248::readBackRegister()
+{
+  _wire->beginTransmission(_address);
+  _wire->endTransmission();
+  _wire->requestFrom(_address, (uint8_t)1);
+  return _wire->read();
+}
+
+
+uint8_t AD5248::midScaleReset(const uint8_t rdac)
+{
+  if (rdac >= _pmCount) return AD5248_ERROR;
+
+  uint8_t cmd = AD5248_RESET;
+  if (rdac == 1) cmd |= AD5248_RDAC1;
+  _lastValue[rdac] = AD5248_MIDPOINT;
+  return send(cmd, _lastValue[rdac]);
+}
+
+
+//  read datasheet P.??
+uint8_t AD5248::shutDown()
+{
+  uint8_t cmd = AD5248_SHUTDOWN;  //  TODO TEST & VERIFY
+  return send(cmd, 0);
+}
+
+
+uint8_t AD5248::pmCount()
+{
+  return _pmCount;
+}
+
+
+//////////////////////////////////////////////////////////
+//
+//  PROTECTED
+//
+uint8_t AD5248::send(const uint8_t cmd, const uint8_t value)
+{
+  _wire->beginTransmission(_address);
+  _wire->write(cmd);
+  _wire->write(value);
+  return _wire->endTransmission();
+}
+
+
+//////////////////////////////////////////////////////////////
+//
+//  DERIVED CLASS  AD5243 potentiometer
+//
+AD5243::AD5243(TwoWire * wire) : AD5248(0x2C, wire)
+{
+  _pmCount = 2;
+}
+
+
+//  -- END OF FILE --
+

libraries/AD5248/AD5248.h

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+#pragma once
+//
+//    FILE: AD5248.h
+//  AUTHOR: Rob Tillaart
+// VERSION: 0.1.0
+// PURPOSE: Library for I2C digital potentiometer AD5243 + rheostat AD5248
+//    DATE: 2023-12-12
+//     URL: https://github.com/RobTillaart/AD5248
+
+
+#include "Arduino.h"
+#include "Wire.h"
+
+
+#define AD5248_LIB_VERSION    (F("0.1.0"))
+
+
+#define AD5248_OK             0
+#define AD5248_ERROR          100
+
+
+#define AD5248_MIDPOINT       127
+ 
+
+class AD5248
+{
+public:
+  AD5248(uint8_t address, TwoWire * wire = &Wire);
+
+  bool    begin();
+  bool    isConnected();
+
+  //  RESET
+  uint8_t reset();    //  reset both channels to AD524X_MIDPOINT
+  uint8_t zeroAll();  //  set both channels to 0
+
+  //  READ WRITE
+  uint8_t read(const uint8_t channel);
+  uint8_t write(const uint8_t channel, const uint8_t value);
+
+  uint8_t midScaleReset(const uint8_t channel);
+  uint8_t pmCount();
+
+
+  //  DEBUGGING
+  uint8_t readBackRegister();  //  returns the last value written in register.
+
+  //  experimental - to be tested - use at own risk
+  uint8_t shutDown();          //  datasheet P15
+
+
+protected:
+  uint8_t   _pmCount = 2;
+
+  uint8_t   send(const uint8_t cmd, const uint8_t value);
+
+  uint8_t   _lastValue[2];
+  uint8_t   _address;
+  TwoWire * _wire;
+};
+
+
+//////////////////////////////////////////////////////////////
+//
+//  DERIVED CLASSES  AD5248 rheostat
+//
+class AD5243 : public AD5248
+{
+public:
+  AD5243(TwoWire *wire = &Wire);
+};
+
+
+//  -- END OF FILE --
+

libraries/AD5248/CHANGELOG.md

@@ -0,0 +1,11 @@
+# Change Log AD5248
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](http://keepachangelog.com/)
+and this project adheres to [Semantic Versioning](http://semver.org/).
+
+
+## [0.1.0] - 2023-12-12
+- initial versions
+

libraries/AD5248/LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2023-2023 Rob Tillaart
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

libraries/AD5248/README.md

@@ -0,0 +1,140 @@
+
+[![Arduino CI](https://github.com/RobTillaart/AD5248/workflows/Arduino%20CI/badge.svg)](https://github.com/marketplace/actions/arduino_ci)
+[![Arduino-lint](https://github.com/RobTillaart/AD5248/actions/workflows/arduino-lint.yml/badge.svg)](https://github.com/RobTillaart/AD5248/actions/workflows/arduino-lint.yml)
+[![JSON check](https://github.com/RobTillaart/AD5248/actions/workflows/jsoncheck.yml/badge.svg)](https://github.com/RobTillaart/AD5248/actions/workflows/jsoncheck.yml)
+[![GitHub issues](https://img.shields.io/github/issues/RobTillaart/AD5248.svg)](https://github.com/RobTillaart/AD5248/issues)
+
+[![License: MIT](https://img.shields.io/badge/license-MIT-green.svg)](https://github.com/RobTillaart/AD5248/blob/master/LICENSE)
+[![GitHub release](https://img.shields.io/github/release/RobTillaart/AD5248.svg?maxAge=3600)](https://github.com/RobTillaart/AD5248/releases)
+[![PlatformIO Registry](https://badges.registry.platformio.org/packages/robtillaart/library/AD5248.svg)](https://registry.platformio.org/libraries/robtillaart/AD5248)
+
+
+# AD5248
+
+Arduino library for I2C digital potentioMeter AD5243 + rheostat AD5248
+
+
+## Description
+
+The AD5243 is a digital potentiometer, the AD5248 is a digital rheostat.
+
+
+|  device  |  channels  |  steps |  ranges KΩ         |  notes  :|
+|:--------:|:----------:|:------:|:------------------:|:--------:|
+|  AD5243  |     2      |  256   |  2.5, 10, 50, 100  |  potentioMeter
+|  AD5248  |     2      |  256   |  2.5, 10, 50, 100  |  rheostat
+
+
+Both IC's have two "channels" and they do not have the output lines
+some other IC's in these series have e.g. like the AD5242.
+
+The AD5243 has a fixed address (0x2F = 47) while the AD5248 has 2 address pins 
+giving 4 possible addresses. See table.
+
+
+| Addr(dec)| Addr(Hex) |  AD1  |  AD0  |
+|:--------:|:---------:|:-----:|:-----:|
+|    44    |   0x2C    |  GND  |  GND  |
+|    45    |   0x2D    |  GND  |  +5V  |
+|    46    |   0x2E    |  +5V  |  GND  |
+|    47    |   0x2F    |  +5V  |  +5V  |
+
+
+An important property of the devices is that they defaults
+to their mid position at startup.
+
+The library defines AD5243_MIDPOINT == 127.
+To be used to set to defined mid-point.
+
+
+#### Related
+
+- https://github.com/RobTillaart/AD520x
+- https://github.com/RobTillaart/AD524X
+- https://github.com/RobTillaart/AD5245
+- https://github.com/RobTillaart/AD5144A
+- https://github.com/RobTillaart/AD5263
+- https://github.com/RobTillaart/X9C10X
+
+
+#### Compatibles
+
+
+If you know compatible devices please let me know.
+
+
+## Interface
+
+```cpp
+#include "AD5248.h"
+```
+
+The library has a number of functions which are all quite straightforward.
+One can get / set the value of (both) the potentiometer(s), and the O1 and O2 output lines.
+
+
+#### Constructors
+
+- **AD5243(TwoWire \*wire = &Wire)** constructor base class,
+creates an instance with 2 potentiometers.
+- **AD5248(uint8_t address, TwoWire \*wire = &Wire)** create an instance with 2 rheostats.
+- **bool begin()** initialization of the object. 
+Note the user must call **wire.begin()** or equivalent before calling **begin()**.
+- **bool isConnected()** See if the address set in constructor is on the I2C bus.
+
+
+#### REad write
+
+- **uint8_t read(uint8_t channel)** read back the set value.
+- **uint8_t write(uint8_t channel, uint8_t value)** set channel 0/1 to value 0..255.
+- **uint8_t zeroAll()** sets all potentiometer's to 0 and I/O to LOW.
+- **uint8_t reset()** sets all potentiometer's to midpoint == 127. (startup default)
+- **uint8_t midScaleReset(uint8_t channel)** resets one potentiometer to midpoint == 127.
+- **uint8_t readBackRegister()** read register back, for debugging.
+
+
+#### Experimental
+
+- **uint8_t shutDown()** check datasheet, not tested yet, use at own risk.
+
+
+## Operation
+
+The examples show the basic working of the functions.
+
+
+## Error codes
+
+|  define        |  value  |
+|:---------------|:-------:|
+|  AD5248_OK     |   0     |
+|  AD5248_ERROR  |   100   |
+
+
+## Future
+
+#### Must
+
+- improve documentation.
+- buy hardware
+- test
+
+#### Should
+
+- sync with AD524X library.
+
+#### Could
+
+
+#### Wont
+
+
+
+## Support
+
+If you appreciate my libraries, you can support the development and maintenance.
+Improve the quality of the libraries by providing issues and Pull Requests, or
+donate through PayPal or GitHub sponsors.
+
+Thank you,
+

libraries/AD5248/examples/AD5243_read/AD5243_read.ino

@@ -0,0 +1,48 @@
+//
+//    FILE: AD5243_read.ino
+//  AUTHOR: Rob Tillaart
+// PURPOSE: demo
+//     URL: https://github.com/RobTillaart/AD5248
+//
+
+
+#include "AD5248.h"
+
+AD5243 AD01;
+
+
+void setup()
+{
+  Serial.begin(115200);
+  Serial.println();
+  Serial.println(__FILE__);
+  Serial.print("AD5248_LIB_VERSION: ");
+  Serial.println(AD5248_LIB_VERSION);
+
+  Wire.begin();
+  Wire.setClock(400000);
+
+  bool b = AD01.begin();
+  Serial.println(b ? "true" : "false");
+  Serial.println(AD01.isConnected());
+}
+
+
+void loop()
+{
+  for (int val = 0; val < 255; val++)
+  {
+    Serial.print(val);
+    AD01.write(1, val);
+    delay(100);
+
+    int x = AD01.read(1);
+    Serial.print('\t');
+    Serial.println(x);
+    delay(100);
+  }
+  delay(1000);
+}
+
+
+//  -- END OF FILE --

libraries/AD5248/examples/AD5243_write/AD5243_write.ino

@@ -0,0 +1,43 @@
+//
+//    FILE: AD5243_write.ino
+//  AUTHOR: Rob Tillaart
+// PURPOSE: demo
+//     URL: https://github.com/RobTillaart/AD5248
+//
+
+
+#include "AD5248.h"
+
+AD5243 AD01;
+
+
+void setup()
+{
+  Serial.begin(115200);
+  Serial.println();
+  Serial.println(__FILE__);
+  Serial.print("AD5248_LIB_VERSION: ");
+  Serial.println(AD5248_LIB_VERSION);
+
+  Wire.begin();
+  Wire.setClock(400000);
+
+  bool b = AD01.begin();
+  Serial.println(b ? "true" : "false");
+  Serial.println(AD01.isConnected());
+}
+
+
+void loop()
+{
+  for (int val = 0; val < 255; val++)
+  {
+    AD01.write(1, val);
+    AD01.write(0, 255 - val);
+    Serial.println(val);
+    delay(20);
+  }
+}
+
+
+//  -- END OF FILE --

libraries/AD5248/examples/AD5243_write_ESP32/.arduino-ci.yml

@@ -0,0 +1,27 @@
+platforms:
+  rpipico:
+    board: rp2040:rp2040:rpipico
+    package: rp2040:rp2040
+    gcc:
+      features:
+      defines:
+        - ARDUINO_ARCH_RP2040
+      warnings:
+      flags:
+
+packages:
+  rp2040:rp2040:
+    url: https://github.com/earlephilhower/arduino-pico/releases/download/global/package_rp2040_index.json
+
+compile:
+  # Choosing to run compilation tests on 2 different Arduino platforms
+  platforms:
+    # - uno
+    # - due
+    # - zero
+    # - leonardo
+    # - m4
+    - esp32
+    # - esp8266
+    # - mega2560
+    # - rpipico

libraries/AD5248/examples/AD5243_write_ESP32/AD5243_write_ESP32.ino

@@ -0,0 +1,43 @@
+//
+//    FILE: AD5243_write_ESP32.ino
+//  AUTHOR: Rob Tillaart
+// PURPOSE: demo
+//     URL: https://github.com/RobTillaart/AD5248
+//
+
+
+#include "AD5248.h"
+
+AD5243 AD01(&Wire1);
+
+
+void setup()
+{
+  Serial.begin(115200);
+  Serial.println();
+  Serial.println(__FILE__);
+  Serial.print("AD5248_LIB_VERSION: ");
+  Serial.println(AD5248_LIB_VERSION);
+
+  Wire1.begin(21, 22);  //  adjust if needed
+  Wire1.setClock(400000);
+  
+  bool b = AD01.begin();
+  Serial.println(b ? "true" : "false");
+  Serial.println(AD01.isConnected());
+}
+
+
+void loop()
+{
+  for (int val = 0; val < 255; val++)
+  {
+    AD01.write(0, val);
+    AD01.write(1, 255 - val);
+    Serial.println(val);
+    delay(20);
+  }
+}
+
+
+//  -- END OF FILE --

libraries/AD5248/examples/AD5243_write_RP2040/.arduino-ci.yml

@@ -0,0 +1,27 @@
+platforms:
+  rpipico:
+    board: rp2040:rp2040:rpipico
+    package: rp2040:rp2040
+    gcc:
+      features:
+      defines:
+        - ARDUINO_ARCH_RP2040
+      warnings:
+      flags:
+
+packages:
+  rp2040:rp2040:
+    url: https://github.com/earlephilhower/arduino-pico/releases/download/global/package_rp2040_index.json
+
+compile:
+  # Choosing to run compilation tests on 2 different Arduino platforms
+  platforms:
+    # - uno
+    # - due
+    # - zero
+    # - leonardo
+    # - m4
+    # - esp32
+    # - esp8266
+    # - mega2560
+    - rpipico

libraries/AD5248/examples/AD5243_write_RP2040/AD5243_write_RP2040.ino

@@ -0,0 +1,45 @@
+//
+//    FILE: AD5243_write_RP2040.ino
+//  AUTHOR: Rob Tillaart
+// PURPOSE: demo
+//     URL: https://github.com/RobTillaart/AD5248
+//
+
+
+#include "AD5248.h"
+
+AD5243 AD01(&Wire1);
+
+
+void setup()
+{
+  Serial.begin(115200);
+  Serial.println();
+  Serial.println(__FILE__);
+  Serial.print("AD5248_LIB_VERSION: ");
+  Serial.println(AD5248_LIB_VERSION);
+
+  Wire1.setSDA(12);  //  adjust if needed
+  Wire1.setSCL(13);  //  adjust if needed
+  Wire1.begin();
+  Wire1.setClock(400000);
+  
+  bool b = AD01.begin();
+  Serial.println(b ? "true" : "false");
+  Serial.println(AD01.isConnected());
+}
+
+
+void loop()
+{
+  for (int val = 0; val < 255; val++)
+  {
+    AD01.write(1, val);
+    AD01.write(0, 255 - val);
+    Serial.println(val);
+    delay(20);
+  }
+}
+
+
+//  -- END OF FILE --

libraries/AD5248/keywords.txt

@@ -0,0 +1,27 @@
+# Syntax Colouring Map For AD5248
+
+# Data types (KEYWORD1)
+AD5243	KEYWORD1
+AD5248	KEYWORD1
+
+
+# Methods and Functions (KEYWORD2)
+begin	KEYWORD2
+reset	KEYWORD2
+zeroAll	KEYWORD2
+
+read	KEYWORD2
+write	KEYWORD2
+
+midScaleReset	KEYWORD2
+pmCount	KEYWORD2
+shutDown	KEYWORD2
+
+
+# Constants (LITERAL1)
+AD5248_LIB_VERSION	LITERAL1
+
+AD5248_OK	LITERAL1
+AD5248_ERROR	LITERAL1
+AD5248_MIDPOINT	LITERAL1
+

libraries/AD5248/library.json

@@ -0,0 +1,23 @@
+{
+  "name": "AD5248",
+  "keywords": "I2C,digital,potentiometer, rheostat, AD5243, AD5248",
+  "description": "Library for I2C digital potentiometer AD5243 + rheostat AD5248.",
+  "authors":
+  [
+    {
+      "name": "Rob Tillaart",
+      "email": "Rob.Tillaart@gmail.com",
+      "maintainer": true
+    }
+  ],
+  "repository":
+  {
+    "type": "git",
+    "url": "https://github.com/RobTillaart/AD5248"
+  },
+  "version": "0.1.0",
+  "license": "MIT",
+  "frameworks": "*",
+  "platforms": "*",
+  "headers": "AD5248.h"
+}

libraries/AD5248/library.properties

@@ -0,0 +1,11 @@
+name=AD5248
+version=0.1.0
+author=Rob Tillaart <rob.tillaart@gmail.com>
+maintainer=Rob Tillaart <rob.tillaart@gmail.com>
+sentence=Library for I2C digital potentiometer AD5243 + rheostat AD5248
+paragraph=
+category=Signal Input/Output
+url=https://github.com/RobTillaart/AD5248
+architectures=*
+includes=AD5248.h
+depends=

libraries/AD5248/test/unit_test_001.cpp

@@ -0,0 +1,123 @@
+//
+//    FILE: unit_test_001.cpp
+//  AUTHOR: Rob Tillaart
+//    DATE: 2023-12-12
+// PURPOSE: unit tests for I2C digital PotentioMeter AD5243 + rheostat AD5248
+//          https://github.com/RobTillaart/AD5243_RT
+//          https://github.com/Arduino-CI/arduino_ci/blob/master/REFERENCE.md
+//
+
+// supported assertions
+// ----------------------------
+// assertEqual(expected, actual)
+// assertNotEqual(expected, actual)
+// assertLess(expected, actual)
+// assertMore(expected, actual)
+// assertLessOrEqual(expected, actual)
+// assertMoreOrEqual(expected, actual)
+// assertTrue(actual)
+// assertFalse(actual)
+// assertNull(actual)
+
+
+#include <ArduinoUnitTests.h>
+
+#include "AD5248.h"
+
+
+unittest_setup()
+{
+  fprintf(stderr, "\nAD5248_LIB_VERSION: %s\n", (char *) AD5248_LIB_VERSION);
+}
+
+
+unittest_teardown()
+{
+}
+
+
+unittest(test_constructors)
+{
+  Wire.begin();
+
+  AD5243 ADx;
+  assertEqual(127, ADx.read(0));
+  assertEqual(127, ADx.read(1));
+
+  AD5248 AD1(0x2C);
+  assertEqual(127, AD1.read(0));
+  assertEqual(127, AD1.read(1));
+}
+
+
+unittest(test_pmCount)
+{
+  Wire.begin();
+
+  AD5243 ADx;
+  assertEqual(2, ADx.pmCount());
+  
+  AD5248 AD1(0x2C);
+  assertEqual(2, ADx.pmCount());
+}
+
+
+unittest(test_reset)
+{
+  AD5243 AD;
+  Wire.begin();
+
+  assertEqual(127, AD.read(0));
+  assertEqual(127, AD.read(1));
+
+  AD.zeroAll();
+  assertEqual(0, AD.read(0));
+  assertEqual(0, AD.read(1));
+
+  AD.reset();
+  assertEqual(127, AD.read(0));
+  assertEqual(127, AD.read(1));
+
+  AD.zeroAll();
+  assertEqual(0, AD.read(0));
+  assertEqual(0, AD.read(1));
+
+  AD.midScaleReset(0);
+  assertEqual(127, AD.read(0));
+  assertEqual(0, AD.read(1));
+  AD.midScaleReset(1);
+  assertEqual(127, AD.read(0));
+  assertEqual(127, AD.read(1));
+}
+
+
+unittest(test_write_read)
+{
+  AD5243 AD;
+  Wire.begin();
+
+  assertEqual(127, AD.read(0));
+  assertEqual(127, AD.read(1));
+
+  AD.write(0, 42);
+  assertEqual(42, AD.read(0));
+  assertEqual(127, AD.read(1));
+
+  AD.write(1, 42);
+  assertEqual(42, AD.read(0));
+  assertEqual(42, AD.read(1));
+}
+
+
+unittest(test_constants)
+{
+  assertEqual(0, AD5248_OK);
+  assertEqual(100, AD5248_ERROR);
+  assertEqual(127, AD5248_MIDPOINT);
+}
+
+
+unittest_main()
+
+
+//  -- END OF FILE --