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This version (28 May 2013 15:31) was approved by DragosB.The Previously approved version (06 Nov 2012 17:07) is available.Diff

AD5628 - No-OS Driver for Renesas Microcontroller Platforms

Supported Devices

Evaluation Boards

Overview

The AD5628 device is a low power, octal, 12-bit, buffered voltage-output DAC. The device operates from a single 2.7 V to 5.5 V supply and is guaranteed monotonic by design. The AD5628 is available in both a 4 mm × 4 mm LFCSP and a 16-lead TSSOP.

The AD5628 has an on-chip reference with an internal gain of 2. The AD5628-1 has an 1.25 V 5 ppm/°C reference, giving a full-scale output range of 2.5 V; the AD5628-2, has a 2.5 V 5 ppm/°C reference, giving a full-scale output range of 5 V. The on-board reference is off, at power-up, allowing the use of an external reference. The internal reference is enabled via a software write.

The part incorporates a power-on reset circuit that ensures that the DAC output powers up to 0 V and remains powered up at this level until a valid write takes place. The part contains a power-down feature that reduces the current consumption of the device to 400 nA at 5 V and provides software-selectable output loads while in power-down mode for any or all DAC channels.

The outputs of all DACs can be updated simultaneously using the LDAC function, with the added functionality of user-selectable DAC channels to simultaneously update. There is also an asynchronous CLR that updates all DACs to a user-programmable code—zero scale, midscale, or full scale.

The AD5628 utilizes a versatile 3-wire serial interface that operates at clock rates of up to 50 MHz and is compatible with standard SPI®, QSPI™, MICROWIRE™, and DSP interface standards. The on-chip precision output amplifier enables rail-to-rail output swing.

Applications

  • Process control
  • Portable battery-powered instruments
  • Digital gain and offset adjustment
  • Programmable voltage and current sources
  • Programmable attenuators

01 Oct 2012 10:41 · DragosB

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 AD5628 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 AD5628 driver can be used exactly as it is provided.

There are three functions which are called by the AD5628 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 AD5628 driver:

Function Description
char AD5628_Init(void) Resets the device and performs several initializations.
void AD5628_PowerMode(unsigned char pwrMode, unsigned char channel) Sets the device in a specific power mode.
void AD5628_Reset(void) Resets the device.
void AD5628_SetInputRegister(unsigned long registerValue) Writes a 32-bit data-word to the Input Register of the device.
01 Oct 2012 15:15 · DragosB

Downloads

Renesas RL78G13 Quick Start Guide

This section contains a description of the steps required to run the AD5628 demonstration project on a Renesas RL78G13 platform.

Required Hardware

Required Software

Hardware Setup

A PmodDA4 has to be connected to the PMOD1 connector, pins 1 to 6 (see image below).

Reference Project Overview

The reference project initializes the AD5628 part and writes:

  • to channel A, a value corresponding to 1/2 of Full Scale;
  • to channel B, a value corresponding to 1/4 of Full Scale;
  • to channel C, a value corresponding to 1/8 of Full Scale.


The voltage reference is 2.5V.

Software Project Tutorial

This section presents the steps for developing a software application that will run on the Renesas Demo Kit for RL78G13 for controlling and monitoring the operation of the ADI part.

  • Run the IAR Embedded Workbench for Renesas RL78 integrated development environment.
  • Choose to create a new project (Project – Create New Project).
  • Select the RL78 tool chain, the Empty project template and click OK.

  • Select a location and a name for the project (ADIEvalBoard for example) and click Save.

  • Open the project’s options window (Project – Options).
  • From the Target tab of the General Options category select the RL78 – R5F100LE device.

  • From the Setup tab of the Debugger category select the TK driver and click OK.

  • Extract the files from the lab .zip archive and copy them into the project’s folder.

  • The new source files have to be included into the project. Open the Add Files… window (Project – Add Files…), select all the copied files and click open.

  • At this moment, all the files are included into the project.
  • The project is ready to be compiled and downloaded on the board. Press the F7 key to compile it. Press CTRL + D to download and debug the project.
  • A window will appear asking to configure the emulator. Keep the default settings and press OK.

  • To run the project press F5.

03 Sep 2012 13:02 · DragosB

Renesas RL78G14 Quick Start Guide

This section contains a description of the steps required to run the AD5628 demonstration project on a Renesas RL78G14 platform using the PmodDA4.

Required Hardware

Required Software

The AD5628 demonstration project for the Renesas RL78G14 platform consists of three parts: the AD5628 Driver, the PmodDA4 Demo for RL78G14 and the RL78G14 Common Drivers.

All three parts have to be downloaded.

Hardware Setup

A PmodDA4 has to be connected to the PMOD1 connector, pins 1 to 6 (see image below).

Reference Project Overview

The reference project initializes the AD5628 part and writes:

  • to channel A, a value corresponding to 1/2 of Full Scale;
  • to channel B, a value corresponding to 1/4 of Full Scale;
  • to channel C, a value corresponding to 1/8 of Full Scale.


The voltage reference is 2.5V.

Software Project Tutorial

This section presents the steps for developing a software application that will run on the Renesas Demo Kit for RL78G14 for controlling and monitoring the operation of the ADI part.

  • Run the IAR Embedded Workbench for Renesas RL78 integrated development environment.
  • Choose to create a new project (Project – Create New Project).
  • Select the RL78 tool chain, the Empty project template and click OK.

  • Select a location and a name for the project (ADIEvalBoard for example) and click Save.

  • Open the project’s options window (Project – Options).
  • From the Target tab of the General Options category select the RL78 – R5F104PJ device.

  • From the Setup tab of the Debugger category select the TK driver and click OK.

  • Copy the downloaded files into the project's folder.

  • The new source files have to be included into the project. Open the Add Files… window (Project – Add Files…), select all the copied files and click open.

  • At this moment, all the files are included into the project.
  • The project is ready to be compiled and downloaded on the board. Press the F7 key to compile it. Press CTRL + D to download and debug the project.
  • A window will appear asking to configure the emulator. Keep the default settings and press OK.

  • To run the project press F5.

09 May 2013 17:10 · DragosB

Renesas RX62N Quick Start Guide

This section contains a description of the steps required to run the AD5628 demonstration project on a Renesas RX62N platform.

Required Hardware

Required Software

Hardware Setup

A PmodDA4 has to be interfaced with the Renesas Demonstration Kit (RDK) for RX62N:

  PmodDA4 Pin 1 (CS)   → YRDKRX62N J8 connector Pin 15
  PmodDA4 Pin 2 (MOSI) → YRDKRX62N J8 connector Pin 19
  PmodDA4 Pin 4 (CLK)  → YRDKRX62N J8 connector Pin 20
  PmodDA4 Pin 5 (GND)  → YRDKRX62N J8 connector Pin 4
  PmodDA4 Pin 6 (VCC)  → YRDKRX62N J8 connector Pin 3

Reference Project Overview

The reference project initializes the AD5628 part and writes:

  • to channel A, a value corresponding to 1/2 of Full Scale;
  • to channel B, a value corresponding to 1/4 of Full Scale;
  • to channel C, a value corresponding to 1/8 of Full Scale.

Software Project Setup

This section presents the steps for developing a software application that will run on the Renesas Demo Kit for RX62N for controlling and monitoring the operation of the ADI part.

  • Run the High-performance Embedded Workshop integrated development environment.
  • A window will appear asking to create or open project workspace. Choose “Create a new project workspace” option and press OK.
  • From “Project Types” option select “Application”, name the Workspace and the Project “ADIEvalBoard”, select the “RX” CPU family and “Renesas RX Standard” tool chain. Press OK.

  • A few windows will appear asking to configure the project:
    • In the “Select Target CPU” window, select “RX600” CPU series, “RX62N” CPU Type and press Next.
    • In the “Option Setting” windows keep default settings and press Next.
    • In the “Setting the Content of Files to be generated” window select “None” for the “Generate main() Function” option and press Next.
    • In the “Setting the Standard Library” window press “Disable all” and then Next.
    • In the “Setting the Stack Area” window check the “Use User Stack” option and press Next.
    • In the “Setting the Vector” window keep default settings and press Next.
    • In the “Setting the Target System for Debugging” window choose “RX600 Segger J-Link” target and press Next.
    • In the “Setting the Debugger Options” and “Changing the Files Name to be created” windows keep default settings, press Next and Finish.
  • The workspace is created.

  • The RPDL (Renesas Peripheral Driver Library) has to integrated in the project. Unzip the RPDL files (double-click on the file “RPDL_RX62N.exe”). Navigate to where the RPDL files were unpacked and double-click on the “Copy_RPDL_RX62N.bat” to start the copy process. Choose the LQFP package, type the full path where the project was created and after the files were copied, press any key to close the window.
  • The new source files have to be included in the project. Use the key sequence Alt, P, A to open the “Add files to project ‘ADIEvalBoard’” window. Double click on the RPDL folder. From the “Files of type” drop-down list, select “C source file (*.C)”. Select all of the files and press Add.

  • To avoid conflicts with standard project files remove the files “intprg.c” and “vecttbl.c” which are included in the project. Use the key sequence Alt, P, R to open the “Remove Project Files” window. Select the files, click on Remove and press OK.

  • Next the new directory has to be included in the project. Use the key sequence Alt, B, R to open the “RX Standard Toolchain” window. Select the C/C++ tab, select “Show entries for: Include file directories” and press Add. Select “Relative to: Project directory”, type “RPDL” as sub-directory and press OK.

  • The library file path has to be added in the project. Select the Link/Library tab, select “Show entries for: Library files” and press Add. Select “Relative to: Project directory”, type “RPDL\RX62N_library” as file path and press OK.

  • Because the “intprg.c” file was removed the “PIntPrg” specified in option “start” has to be removed. Change “Category” to “Section”. Press “Edit”, select “PIntPRG” and press “Remove”. From this window the address of each section can be also modified. After all the changes are made press OK two times.

  • At this point the files extracted from the zip file located in the “Software Tools” section have to be added into the project. Copy all the files from the archive into the project folder.

  • Now, the files have to be included in the project. Use the key sequence Alt, P, A to open the “Add files to project ‘ADIEvalBoard’” window. Navigate into ADI folder. From the “Files of type” drop-down list, select “Project Files”. Select all the copied files and press Add.

  • Now, the project is ready to be built. Press F7. The message after the Build Process is finished has to be “0 Errors, 0 Warnings”. To run the program on the board, you have to download the firmware into the microprocessor’s memory.
03 Feb 2012 15:32 · dragosb

More information

01 Jun 2012 12:17
resources/tools-software/uc-drivers/renesas/ad5628.txt · Last modified: 28 May 2013 15:11 by LucianS