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This version (30 May 2013 15:50) was approved by LucianS, larsc.The Previously approved version (30 May 2013 15:45) is available.Diff

AD74xx - No-OS Driver for Renesas Microcontroller Platforms

Supported Devices

Evaluation Boards

Reference Circuits

Overview

The AD7476/AD7477/AD7478 are, respectively, 12-bit, 10-bit, and 8-bit, high speed, low power, successive approximation ADCs. The parts operate from a single 2.35 V to 5.25 V power supply and feature throughput rates up to 1 MSPS. Each part contains a low noise, wide bandwidth track-and-hold amplifier that can handle input frequencies in excess of 6 MHz.

The conversion process and data acquisition are controlled using CS the serial clock, allowing the devices to interface with microprocessors or DSPs. The input signal is sampled on the falling edge of CS and the conversion is initiated at this point. There are no pipeline delays associated with these parts.

The AD7476/AD7477/AD7478 use advanced design techniques to achieve very low power dissipation at high throughput rates. The reference for the parts is taken internally from VDD. This allows the widest dynamic input range to the ADC. Thus, the analog input range for the parts are 0 V to VDD. The conversion rate is determined by the SCLK.

01 Oct 2012 13:41 · 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 AD74xx 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 AD74xx driver can be used exactly as it is provided.

There are three functions which are called by the AD74xx 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 AD74xx driver:

Function Description
char AD74xx_Init(char partNumber) Initializes the device.
void AD74xx_PowerDown(void) Powers down the device.
void AD74xx_PowerUp(void) Powers up the device by performing a dummy read.
unsigned short AD74xx_GetRegisterValue(void) Reads the conversion value.
float AD74xx_ConvertToVolts(unsigned short rawValue, float vRef) Converts a raw sample to volts.
01 Oct 2012 14:39 · Dragos Bogdan

Downloads

Renesas RL78G13 Quick Start Guide

This section contains a description of the steps required to run the AD7476 demonstration project on a Renesas RL78G13 platform using the PmodAD1.

Required Hardware

Required Software

Hardware Setup

A PmodAD1 has to be interfaced with the Renesas Demonstration Kit (RDK) for RL78G13:

PmodAD1 J1 connector Pin CS  → YRDKRL78G13 J11 connector Pin 1
PmodAD1 J1 connector Pin D0  → YRDKRL78G13 J11 connector Pin 3
PmodAD1 J1 connector Pin CLK → YRDKRL78G13 J11 connector Pin 4
PmodAD1 J1 connector Pin GND → YRDKRL78G13 J11 connector Pin 5
PmodAD1 J1 connector Pin VCC → YRDKRL78G13 J11 connector Pin 6

PmodAD1 should not be inserted in the pmod connector like the other pmods because pin D1(J1 connector) of PmodAD1 is an output pin, same as MOSI pin(pin 2 of J11 connector) of YRDKRL78G13. Damage could result when connecting the two pins togheter. The MOSI pin cannot be changed to be an input pin, as it is used to display data on the LCD. Therefore the connection above should be used to avoid this situation.


  • The reference voltage for the AD7476 is 3.3V.


Reference Project Overview

The reference project:

  • samples the input voltage;
  • displays the value on the LCD (in hexa, decimal and volts).

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 AD7476 demonstration project on a Renesas RL78G14 platform using the PmodAD1.

Required Hardware

Required Software

The AD7476 demonstration project for the Renesas RL78G14 platform consists of three parts: the AD7476 Driver, the PmodAD1 Demo for RL78G14 and the RL78G14 Common Drivers.

All three parts have to be downloaded.

Hardware Setup

A PmodAD1 has to be interfaced with the Renesas Demonstration Kit (RDK) for RL78G14:

PmodAD1 J1 connector Pin CS  → RDKRL78G14 J11 connector Pin 1
PmodAD1 J1 connector Pin D0  → RDKRL78G14 J11 connector Pin 3
PmodAD1 J1 connector Pin CLK → RDKRL78G14 J11 connector Pin 4
PmodAD1 J1 connector Pin GND → RDKRL78G14 J11 connector Pin 5
PmodAD1 J1 connector Pin VCC → RDKRL78G14 J11 connector Pin 6

PmodAD1 should not be inserted in the pmod connector like the other pmods because pin D1(J1 connector) of PmodAD1 is an output pin, same as MOSI pin(pin 2 of J11 connector) of RDKRL78G14. Damage could result when connecting the two pins togheter. The MOSI pin cannot be changed to be an input pin, as it is used to display data on the LCD. Therefore the connection above should be used to avoid this situation.


  • The reference voltage for the AD7476 is 3.3V.


Reference Project Overview

The reference project:

  • samples the input voltage on channel A0;
  • displays the value on the LCD (in hexa, decimal and volts).

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 AD7476 demonstration project on a Renesas RX62N platform using the PmodAD1.

Required Hardware

Required Software

Hardware Setup

A PmodAD1 has to be interfaced with the Renesas Demonstration Kit (RDK) for RX62N:

  PmodAD1 Pin 1 (CS)   → YRDKRX62N J8 connector Pin 15
  PmodAD1 Pin 3 (MISO) → YRDKRX62N J8 connector Pin 22
  PmodAD1 Pin 4 (CLK)  → YRDKRX62N J8 connector Pin 20
  PmodAD1 Pin 5 (GND)  → YRDKRX62N J8 connector Pin 4
  PmodAD1 Pin 6 (VCC)  → YRDKRX62N J8 connector Pin 3

Reference Project Overview

The reference project samples the input voltage and displays the value 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

More information

01 Jun 2012 12:17