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This version (05 Jul 2013 14:53) was approved by DragosB.The Previously approved version (09 Oct 2012 09:15) is available.Diff

AD5160 - No-OS Driver for Microchip Microcontroller Platforms

Supported Devices

Evaluation Boards

Overview

The AD5160 provides a compact 2.9 mm × 3 mm packaged solution for 256-position adjustment applications. These devices perform the same electronic adjustment function as mechanical potentiometers or variable resistors but with enhanced resolution, solid-state reliability, and superior low temperature coefficient performance.

The wiper settings are controllable through an SPI-compatible digital interface. The resistance between the wiper and either end point of the fixed resistor varies linearly with respect to the digital code transferred into the RDAC latch.

Operating from a 2.7 V to 5.5 V power supply and consuming less than 5 μA allows for usage in portable battery-operated applications.

28 Sep 2012 16:12 · Dragos Bogdan

The goal of this project (Microcontroller No-OS) is to be able to provide reference projects for lower end processors, which can't run Linux, or aren't running a specific operating system, to help those customers using microcontrollers with ADI parts. Here you can find a generic driver which can be used as a base for any microcontroller platform and also specific drivers for different microcontroller platforms.

Driver Description

The driver contains two parts:

  • The driver for the AD5160 part, which may be used, without modifications, with any microcontroller.
  • The Communication Driver, where the specific communication functions for the desired type of processor and communication protocol have to be implemented. This driver implements the communication with the device and hides the actual details of the communication protocol to the ADI driver.

The Communication Driver has a standard interface, so the AD5160 driver can be used exactly as it is provided.

There are three functions which are called by the AD5160 driver:

  • SPI_Init() – initializes the communication peripheral.
  • SPI_Write() – writes data to the device.
  • SPI_Read() – reads data from the device.

SPI driver architecture

The following functions are implemented in this version of AD5160 driver:

Function Description
char AD5160_Init(void) Initializes the SPI communication peripheral.
void AD5160_Set(unsigned char value) Writes data to AD5160.
01 Oct 2012 09:04 · Dragos Bogdan

Downloads

Digilent Cerebot MX3cK Quick Start Guide

This section contains a description of the steps required to run the AD5160 demonstration project on a Digilent Cerebot MX3cK platform.

Required Hardware

Required Software

The AD5160 demonstration project for PIC32MX320F128H consists of three parts: the AD5160 Driver, the PmodDPOT Demo for PIC32MX320F128H and the PIC32MX320F128H Common Drivers.

All three parts have to be downloaded.

Hardware Setup

A PmodDPOT has to be connected to the JE connector of Cerebot MX3cK development board.

Reference Project Overview

The following commands were implemented in this version of AD5160 reference project for Cerebot MX3cK board.

Command Description
help? Displays all available commands.
resistance= Sets the output resistance between W and B. Accepted values:
60 .. 10020 - resistance value to be set in ohms.
resistance? Displays the last written resistance value in ohms.
register= Writes to the DAC register. Accepted values:
0 .. 255 - the value written to the DAC.
register? Displays the last written value in register.

Commands can be executed using a serial terminal connected to the UART1 peripheral of PIC32MX320F128H.

The following image shows a generic list of commands in a serial terminal connected to processor’s UART peripheral.

Software Project Setup

This section presents the steps for developing a software application that will run on the Digilent Cerebot MX3cK development board for controlling and monitoring the operation of the ADI part.

  • Run the MPLAB X integrated development environment.
  • Choose to create a new project.
  • In the Choose Project window select Microchip Embedded category, Standalone Project and press Next.

  • In the Select Device window choose PIC32MX320F128H device and press Next.

  • In the Select Tool window select the desired hardware tool and press Next.

  • In the Select Compiler window chose the XC32 compiler and press Next.

  • In the Select Project Name and Folder window choose a name and a location for the project.

  • After the project is created, all the downloaded source files have to be copied in the project folder and included in the project.

  • The project is ready to be built and downloaded on the development board.

05 Jul 2012 14:45

Digilent Cerebot MC7 Quick Start Guide

This section contains a description of the steps required to run the AD5160 demonstration project on a Digilent Cerebot MC7platform.

Required Hardware

Required Software

Hardware Setup

A PmodDPOT has to be connected to the JB connector of Cerebot MC7 development board.

Reference Project Overview

Following commands were implemented in this version of AD5160 reference project for Cerebot MC7 board.

Command Description
help? Displays all available commands.
resistance= Sets the output resistance. Accepted values 0 - 10020.
resistance? Displays the last written value.
register= Writes to the DAC register of the current channel. Accepted values 0 - 255.
register? Displays the last written value.

Commands can be executed using a serial terminal connected to the UART1 peripheral of dsPIC33FJ128MC706A.

The following image shows a list of commands in a serial terminal connected to processor’s UART peripheral.

Software Project Setup

This section presents the steps for developing a software application that will run on the Digilent Cerebot MC7 development board for controlling and monitoring the operation of the ADI part.

  • Run the MPLAB X integrated development environment.
  • Choose to create a new project.
  • In the Choose Project window select Microchip Embedded category, Standalone Project and press Next.

  • In the Select Device window choose dsPIC33FJ128MC706A device and press Next.

  • In the Select Tool window select the desired hardware tool and press Next.

  • In the Select Compiler window chose the XC16 compiler and press Next.

  • In the Select Project Name and Folder window choose a name and a location for the project.

  • After the project is created, the source files have to be copied in the project folder and included in the project.

  • The project is ready to be built and downloaded on the development board.

16 Jul 2012 16:48

Digilent Cerebot MX3cK Quick Start Guide - chipKIT Project

This section contains a description of the steps required to run the AD5160 chipKIT demonstration project on a Digilent Cerebot MX3cK platform.

Required Hardware

Required Software

Hardware Setup

A PmodDPOT has to be connected to the JE connector of Cerebot MX3cK development board.

Reference Project Overview

Following commands were implemented in this version of AD5160 chipKIT reference project for Cerebot MX3cK board.

Command Description
help? Displays all available commands.
resistance= Sets the output resistance. Accepted values: 85 - 10020.(for 10KOhm device version)
resistance? Displays the last written value.
register= Writes to the DAC register of the current channel. Accepted values 0 - 255.
register? Displays the last written value.

Commands can be executed using the serial monitor.

Carriage return has to be selected as a line ending character. The required baud rate is 9600 baud.

The following image shows a list of commands in the serial monitor.

Software Project Setup

This section presents the steps for developing a chipKIT application that will run on the Digilent Cerebot MX3cK development board for controlling and monitoring the operation of the ADI part.

  • Under your Sketchbook directory create a folder called “Libraries”; this folder may already exist.
  • Unzip the downloaded file in the libraries folder.
  • Run the MPIDE environment.
  • You should see the new library under Sketch→Import Library, under Contributed.

  • Also you should see under File→Examples the demo project for the ADI library.
  • Select the ADIDriver example.

  • Select the Cerebot MX3cK board from Tools→Board.
  • Select the corresponding Serial Communication Port from Tools→Serial Port
  • The project is ready to be uploaded on the development board.

23 Jul 2012 16:51

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