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This version (29 May 2013 11:30) was approved by LucianS.The Previously approved version (28 May 2013 10:21) is available.Diff

AD799x - No-OS Driver for Renesas Microcontroller Platforms

Supported Devices

Evaluation Boards

Overview

The AD7991/AD7995/AD7999 are 12-/10-/8-bit, low power, successive approximation ADCs with an I2C®-compatible interface. Each part operates from a single 2.7 V to 5.5 V power supply and features a 1 μs conversion time.

Each AD7991/AD7995/AD7999 provides a 2-wire serial interface compatible with I2C interfaces. The AD7991 and AD7995 come in two versions and each version has an individual I2C address (see Table 8 of data sheet for address and part number selection). This allows two of the same devices to be connected to the same I2C bus. Both versions support standard, fast, and high speed I2C interface modes. The AD7999 comes in one version.

The AD7991/AD7995/AD7999 normally remain in a shutdown state, powering up only for conversions. The conversion process is controlled by a command mode, during which each I2C read operation initiates a conversion and returns the result over the I2C bus.

When four channels are used as analog inputs, the reference for the part is taken from VDD; this allows the widest dynamic input range to the ADC. Therefore, the analog input range to the ADC is 0 V to VDD. An external reference, applied through the VIN3/VREF input, can also be used with this part.

Applications

  • System Monitoring
  • Battery Powered Systems
  • Data Acquisition
  • Medical Instruments

01 Oct 2012 09:58 · 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 AD799x 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 AD799x driver can be used exactly as it is provided.

There are three functions which are called by the AD799x driver:

  • I2C_Init() – initializes the communication peripheral.
  • I2C_Write() – writes data to the device.
  • I2C_Read() – reads data from the device.

I2C driver architecture

The following functions are implemented in this version of AD799x driver:

Function Description
char AD799x_Init(char partNumber, char deviceVersion) Initializes I2C.
void AD799x_SetConfigurationReg(unsigned char registerValue) Writes data into the Configuration Register.
void AD799x_GetConversionResult(short* convValue, char* channel) Reads the High byte and the Low byte of the conversion.
float AD799x_ConvertToVolts(short rawSample, float vRef) Converts a raw sample to volts.
01 Oct 2012 14:59 · Dragos Bogdan

Downloads

Renesas RL78G13 Quick Start Guide

This section contains a description of the steps required to run the AD7991 demonstration project on a Renesas RL78G13 platform using the PmodAD2.

Required Hardware

Required Software

Hardware Setup

A PmodAD2 has to be interfaced with the Renesas Demonstration Kit (RDK) for RL78G13:

  PmodAD2 J1 connector Pin SCL → YRDKRL78G13 J9  connector Pin 1
  PmodAD2 J1 connector Pin SDA → YRDKRL78G13 J9  connector Pin 3
  PmodAD2 J1 connector Pin GND → YRDKRL78G13 J11 connector Pin 5
  PmodAD2 J1 connector Pin VCC → YRDKRL78G13 J11 connector Pin 6

Reference Project Overview

In the reference project the device is enabled and continuous conversions are made for all four channels. The results of the conversions are displayed on the LCD.

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 · Dragos Bogdan

Renesas RL78G14 Quick Start Guide

This section contains a description of the steps required to run the AD7991 demonstration project on a Renesas RL78G14 platform using the PmodAD2.

Required Hardware

Required Software

The AD7991 demonstration project for the Renesas RL78G14 platform consists of three parts: the AD799x Driver, the PmodAD2 Demo for RL78G14 and the RL78G14 Common Drivers.

All three parts have to be downloaded.

Hardware Setup

A PmodAD2 has to be interfaced with the Renesas Demonstration Kit (RDK) for RL78G14:

  PmodAD2 J1 connector Pin SCL → RDKRL78G14 J8  connector Pin 1
  PmodAD2 J1 connector Pin SDA → RDKRL78G14 J8  connector Pin 3
  PmodAD2 J1 connector Pin GND → RDKRL78G14 J11 connector Pin 5
  PmodAD2 J1 connector Pin VCC → RDKRL78G14 J11 connector Pin 6


  • Using JP1 jumper you can either have 4 input channels or 3 input channels.


Reference Project Overview

The reference project:

  • initiates continuous conversions for all four channels;
  • the results of all conversions are displayed on the LCD.


  • The reference voltage for the AD7991 is the supply voltage which is 3.3V.


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 · Dragos Bogdan

Renesas RX62N Quick Start Guide

This section contains a description of the steps required to run the AD7991 demonstration project on a Renesas RX62N platform using the PmodAD2.

Required Hardware

Required Software

Hardware Setup

A PmodAD2 has to be interfaced with the Renesas Demonstration Kit (RDK) for RX62N:

  PmodAD2 J1 connector 1 (SCL) → YRDKRX62N J2  connector Pin 1
  PmodAD2 J1 connector 3 (SDA) → YRDKRX62N J2  connector Pin 3
  PmodAD2 J1 connector 5 (GND) → YRDKRX62N J8  connector Pin 4
  PmodAD2 J1 connector 7 (VCC) → YRDKRX62N J8  connector Pin 3

Reference Project Overview

In the reference project the device is enabled and continuous conversions are made for all four channels. The results of the conversions are displayed on the LCD.

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 · Dragos Bogdan

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