world leader in high performance signal processing
This version (06 Feb 2014 11:33) was approved by larsc.The Previously approved version (02 Nov 2012 16:09) is available.Diff

AD5780 - Microcontroller No-OS Driver

Supported Devices

Evaluation Boards

Reference Circuits

Overview

The AD5760 is a true 16-bit, unbuffered voltage out DAC that operates from a bipolar supply up to 33V. The AD5760 accepts a positive reference input in the range of 5V to VDD – 2.5V and a negative reference input in the range of VSS + 2.5v to 0V. The AD5760 offers relative accuracy of +/-0.5 LSB max and operation is guaranteed monotonic with a ±0.5 LSB DNL max range specification.

The AD5780 is a true 18-bit, unbuffered voltage out Dac that operates from a bipolar supply up to 33V. Both reference inputs are buffered on chip and external buffers are not required.The AD5780 accepts a positive reference input in the range of 5V to VDD – 2.5V and a negative reference input in the range of VSS + 2.5v to 0V. The AD5780 offers relative accuracy of +/-1 LSB max and operation is guaranteed monotonic with a ±1 LSB DNL max range specification.

The AD5781 is a single 18-bit, unbuffered voltage-output DAC that operates from a bipolar supply of up to 33 V. The AD5781 accepts a positive reference input in the range 5V to VDD – 2.5 V and a negative reference input in the range VSS + 2.5 V to 0 V. The AD5781 offers a relative accuracy specification of ±0.5 LSB max, and operation is guaranteed monotonic with a ±0.5 LSB DNL max specification.

The AD5790 is a single 20-bit, voltage out Dac that operates from a bipolar supply up to 33V. Reference buffers are also provided on-chip The AD5790 accepts a positive reference input in the range of 5V to VDD – 2.5V and a negative reference input in the range of VSS + 2.5v to 0V. The AD5790 offers a relative accuracy of +/-2 LSB's max and operation is guaranteed monotonic with a -1 LSB to +3 LSB's DNL specification.

The AD5791 is a single 20-bit, unbuffered voltage-output DAC that operates from a bipolar supply of up to 33 V. The AD5791 accepts a positive reference input in the range 5 V to VDD – 2.5V and a negative reference input in the range VSS + 2.5 V to 0 V. The AD5791 offers a relative accuracy specification of ±1 LSB max, and operation is guaranteed monotonic with a ±1 LSB DNL max specification.

These parts use a versatile 3-wire serial interface that operates at clock rates of up to 35 MHz and that is compatible with standard SPI, QSPI™, MICROWIRE™, and DSP interface standards. The parts incorporate a power-on reset circuit that ensures the DAC output powers up to 0V in a known output impedance state and remains in this state until a valid write to the device takes place. The parts provide an output clamp feature that places the output in a defined load state.

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 Renesas platforms.

HW Platform(s):

Driver Description

The driver contains two parts:

  • The driver for the AD5780 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 AD5780 driver can be used exactly as it is provided.

There are three functions which are called by the AD5780 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 AD5780 driver:

Function Description
unsigned char AD57XX_Init(char deviceVersion) Initializes the communication with the device.
void AD57XX_SetRegisterValue(unsigned char registerAddress, unsigned long registerValue) Writes data into a register.
unsigned long AD57XX_GetRegisterValue(unsigned char registerAddress) Reads the value of a register.
void AD57XX_EnableOutput(unsigned char state) The part is placed in normal mode or its output is clamped to the ground.
void AD57XX_SetDacValue(unsigned long value) Writes to the DAC register.
void AD57XX_SetClearCode(unsigned long clrCode) Sets the clear code.
void AD57XX_SoftInstruction(unsigned char instructionBit) Asserts RESET, CLR and LDAC in a software manner.
void AD57XX_Setup(unsigned long setupWord) Writes to Control Register.

Downloads

Renesas RL78G13 Quick Start Guide

This section contains a description of the steps required to run the AD5780 demonstration project on a Renesas RL78G13 platform.

Required Hardware

Required Software

Hardware Setup

An EVAL-AD5780SDZ has to be interfaced with the Renesas Demonstration Kit (RDK) for RL78G13:

  EVAL-AD5780SDZ J3 connector Pin SYNC  → YRDKRL78G13 J11 connector Pin 1
  EVAL-AD5780SDZ J3 connector Pin SDIN  → YRDKRL78G13 J11 connector Pin 2
  EVAL-AD5780SDZ J3 connector Pin SDO   → YRDKRL78G13 J11 connector Pin 3
  EVAL-AD5780SDZ J3 connector Pin SCLK  → YRDKRL78G13 J11 connector Pin 4
  EVAL-AD5780SDZ J3 connector Pin DGND  → YRDKRL78G13 J11 connector Pin 5
  EVAL-AD5780SDZ J3 connector Pin RESET → YRDKRL78G13 J18 connector Pin 7
  EVAL-AD5780SDZ J3 connector Pin LDAC  → YRDKRL78G13 J11 connector Pin 9
  EVAL-AD5780SDZ J3 connector Pin CLR   → YRDKRL78G13 J11 connector Pin 10  

Reference Project Overview

The reference project initializes the device, reads the parts internal registers displays them and then generates a triangle signal.

Software Project Setup

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 RX62N Quick Start Guide

This section contains a description of the steps required to run the AD5780 demonstration project on a Renesas RX62N platform.

Required Hardware

Required Software

Hardware Setup

An EVAL-AD5780EBZ board has to be interfaced with the Renesas Demonstration Kit (RDK) for RX62N:

  EVAL-AD5780SDZ J3 connector Pin SYNC  (CS)     →  YRDKRX62N J8 connector Pin 15
  EVAL-AD5780SDZ J3 connector Pin SDIN  (MOSI)   →  YRDKRX62N J8 connector Pin 19
  EVAL-AD5780SDZ J3 connector Pin SDO   (MISO)   →  YRDKRX62N J8 connector Pin 22
  EVAL-AD5780SDZ J3 connector Pin SCLK  (SCLK)   →  YRDKRX62N J8 connector Pin 20
  EVAL-AD5780SDZ J3 connector Pin DGND  (DGND)   →  YRDKRX62N J8 connector Pin 4
  EVAL-AD5780SDZ J3 connector Pin LDAC  (LDAC)   →  YRDKRX62N J8 connector Pin 17
  EVAL-AD5780SDZ J3 connector Pin CLR   (CLR)    →  YRDKRX62N J8 connector Pin 25
  EVAL-AD5780SDZ J3 connector Pin RESET (Reset)  →  YRDKRX62N J8 connector Pin 26
  

Reference Project Overview

The reference project: The reference project initializes the device, reads the parts internal registers displays them and then generates a triangle signal.

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