This is an old revision of the document!
AD5628 - Microcontroller No-OS Driver
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 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 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.
The following functions are implemented in this version of AD5628 driver:
Function | Description |
unsigned char AD5628_Init(void) | Resets the device and performs several initializations. |
void AD5628_PowerMode(unsigned char pwrMode) | 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. |
Downloads
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.
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.
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.