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This version (16 Mar 2012 14:47) was approved by Dragos Bogdan.The Previously approved version (14 Feb 2012 15:52) is available.

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AD5754R - Microcontroller No-OS Driver

Supported Devices

AD5754R

Evaluation Boards

EVAL-AD5754REBZ

Overview

The AD5754R is a quad, 16-bit serial input, voltage output, digital-to-analog converter (DAC). It operates from single supply voltages of +4.5 V up to +16.5 V or dual supply voltages from ±4.5 V up to ±16.5 V. Nominal full-scale output range is software selectable from +5 V, +10 V, +10.8 V, ±5 V, ±10 V, or ±10.8 V. Integrated output amplifiers, reference buffers, and proprietary power-up/power-down control circuitry are also provided.

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 AD5754R 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 AD5754R driver can be used exactly as it is provided. There are three functions which are called by the AD5754R driver:

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

Driver architecture

The implementation of these three functions depends on the used microcontroller.

The following functions are implemented in this version of AD5754R driver:

Function	Description
void AD5754R_SetRegisterValue(unsigned char regBits, unsigned char adrBits, unsigned short registerValue);	Writes data into a register.
unsigned short AD5754R_GetRegisterValue(unsigned char regBits, unsigned char adrBits);	Reads the value of a register.
void AD5754R_SetPower(unsigned char dacChannel, unsigned char onOff);	Enables/disables indicated DAC channels.
void AD5754R_LoadDac(unsigned char dacChannel, unsigned short dacValue);	Writes data into a DAC channel register.
void AD5754R_RangeSelect(unsigned char dacChannel, unsigned char outputRange);	Selects the output range of a DAC channel.
void AD5754R_ControlFunction(unsigned char option, unsigned char bitValue);	Selects an option of Control Register.
unsigned char AD5754R_ReadAlertBits(void);	Reads alert bits form Power Control Register.

Downloads

Renesas RL78G13 Quick Start Guide

This section contains a description of the steps required to run the AD5754R demonstration project on a Renesas RL78G13 platform.

Required Hardware

Required Software

Hardware Setup

An EVAL-AD5754REBZ board has to be interfaced with the Renesas Demonstration Kit (RDK) for RL78G13:

  EVAL-AD5754REB J8 connector Pin 10(SYNC) → YRDKRL78G13 J11 connector Pin 1
  EVAL-AD5754REB J8 connector Pin 7 (MOSI) → YRDKRL78G13 J11 connector Pin 2
  EVAL-AD5754REB J8 connector Pin 1 (MISO) → YRDKRL78G13 J11 connector Pin 3
  EVAL-AD5754REB J8 connector Pin 9 (SCLK) → YRDKRL78G13 J11 connector Pin 4
  EVAL-AD5754REB J8 connector Pin 5 (GND)  → YRDKRL78G13 J11 connector Pin 5
  EVAL-AD5754REB J8 connector Pin 6 (LDAC) → YRDKRL78G13 J11 connector Pin 9
  EVAL-AD5754REB J8 connector Pin 4 (CLR)  → YRDKRL78G13 J11 connector Pin 10

Software Setup

With the Applilet3 for RL78G13 tool the following peripherals have to be configured:

CSI10 (Clocked Serial Interface 10) – For the AD5754R part

Choose to generate the Transmit/receive function for the CSI10 and configure the interface with the following settings:

Transfer mode setting: Single transfer mode
Data length setting : 8 bits
Transfer direction setting: MSB
Specification of data timing: Type 1
Transfer rate setting – Clock mode: Internal clock (master)
Transfer rate setting – Baudrate: 1000000 (bps)
Interrupt setting – Transfer interrupt priority (INTCSI10): Low
Uncheck the callback functions.

Watchdog Timer

Disable the watchdog timer:

Choose for the Watchdog timer operation setting: Unused option.

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.

Two software applications have to be used: Applilet3 for RL78G13 (a tool that automatically generates device drivers for MCU peripheral functions) and IAR Embedded Workbench for Renesas RL78 (the integrated development environment).

Step 1 - Applilet3 for RL78G13

Run the Applilet3 for RL78G13 tool and create a new project for R5F100LE processor. Select IAR Compiler build tool, a project name, a location for the new project and press OK.

Keep the default Pin assignment setting and click Fix settings.

Now the desired peripherals can be configured and the code can be generated. For example, if the clocked serial interface 10 (CSI10) has to be configured, select the Serial peripheral, choose for the Channel 2 of Serial Array Unit 0 (SAU0) the CSI10 interface, Transmit/receive function option and then go to CSI10 tab.

To configure the CSI10 interface for serial transmissions of 8 bits, with MSB first, with the data captured on clock's rising edge, with a frequency of the clock of 1 MHz and the idle state high, the settings from the following image have to be made.

After all the desired peripherals are configured click on the Generate Code button and a new workspace and a new project for the IAR Embedded Workbench will be generated. After the code was generated close the Applilet3 for RL78G13 tool.

Step 2 - IAR Embedded Workbench for Renesas RL78

Run the IAR Embedded Workbench and open the workspace created with the Applilet3 tool.

Copy the files extracted from the zip file into the user_src folder, located in the project’s folder.

The new source files have to be included into the project. Add in the user_src group the files from the corresponding folder (Right click on the group and select Add – Add Files…). Because a new Main file was included the r_main.c file from the applilet_src group has to be deleted (Right click on the file and select Remove).

Now the debugger driver has to be selected from the project’s options. Right click on the project name and select Options. From the Debugger category choose the TK Debugger Driver.

Now, 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.

29 Feb 2012 17:01 · Dragos Bogdan

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