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AD5541A - Microcontroller No-OS Driver
Supported Devices
Evaluation Boards
Overview
The AD5541A is a single, 16-bit, serial input, unbuffered voltage output digital-to-analog converter (DAC) that operate from a single 2.7 V to 5.5 V supply.
The DAC output range extends from 0 V to VREF and is guaranteed monotonic, providing ±1 LSB INL accuracy at 16 bits without adjustment over the full specified temperature range of −40°C to +125°C. The AD5541A is available in a 3 mm × 3 mm, 10-lead LFCSP and 10-lead MSOP. The AD5541A-1 is available in a 3 mm × 3 mm, 8-lead LFCSP.
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 AD5541A 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 AD5541A driver can be used exactly as it is provided.
There are three functions which are called by the AD5541A 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 AD5541A driver:
Function | Description |
unsigned char AD5541A_Init(void) | Initializes the communication peripheral, configures LDAC pin as output and drives it low. |
void AD5541A_SetRegisterValue(unsigned short registerValue) | Sends to DAC register through SPI the 16-bit data-word. |
Downloads
Renesas RL78G13 Quick Start Guide
This section contains a description of the steps required to run the AD5541A demonstration project on a Renesas RL78G13 platform.
Required Hardware
Required Software
Hardware Setup
A PmodDA3 has to be connected to the PMOD1 connector.
Software Setup
With the Applilet3 for RL78G13 tool the following peripherals have to be configured:
CSI10 (Clocked Serial Interface 10) – For the AD5541A part and the ST7579 LCD
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.
TM00 (Timer 00) – For the DelayMs() function
Configure TM00 as an interval timer:
Interval timer setting - Interval value(16 bits):
1 ms
Interval timer setting - Uncheck Generates INTM00 when counting is started
Interrupt setting - Uncheck End of timer channel 0 count, generate an interrupt (INTM00)
Watchdog Timer
Disable the watchdog timer:
Reference Project Overview
The reference project generates an 1 Hz sine wave on the J2 connector.
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.
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
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.
Step 2 - IAR Embedded Workbench for Renesas RL78
Renesas RX62N Quick Start Guide
This section contains a description of the steps required to run the AD5541A demonstration project on a Renesas RX62N platform.
Required Hardware
Required Software
Hardware Setup
A PmodDA3 has to be interfaced with the Renesas Demonstration Kit (RDK) for RX62N:
PmodAD4 Pin 1 (CS) → YRDKRX62N J8 connector Pin 15
PmodAD4 Pin 2 (MOSI) → YRDKRX62N J8 connector Pin 19
PmodAD4 Pin 3 (LDAC) → YRDKRX62N J8 connector Pin 25
PmodAD4 Pin 4 (CLK) → YRDKRX62N J8 connector Pin 20
PmodAD4 Pin 5 (GND) → YRDKRX62N J8 connector Pin 4
PmodAD4 Pin 6 (VCC) → YRDKRX62N J8 connector Pin 3
Reference Project Overview
The reference project generates an 1 Hz sine wave on the J2 connector.
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.
Digilent Cerebot MX3cK Quick Start Guide
This section contains a description of the steps required to run the AD5541A demonstration project on a Digilent Cerebot MX3cK platform.
Required Hardware
Required Software
Hardware Setup
A PmodDA3 has to be connected to the JE connector of Cerebot MX3cK development board.
Reference Project Overview
Following commands were implemented in this version of AD5541A reference project for Cerebot MX3cK board.
Command | Description |
help? | Displays all available commands. |
voltage= | Sets the DAC output voltage. Accepted values: 0 - 2.5 |
voltage? | Displays last written value. |
register= | Writes to the DAC register. Accepted values: 0 - 65535. |
register? | Displays last written value. |
Commands can be executed using a serial terminal connected to the UART1 peripheral of PIC32MX320F128H.
The following image shows a list of commands in a serial terminal connected to processor’s UART peripheral.
Software Project Setup
This section presents the steps for developing a software application that will run on the Digilent Cerebot MX3cK development board for controlling and monitoring the operation of the ADI part.
Run the MPLAB X integrated development environment.
Choose to create a new project.
In the Choose Project window select Microchip Embedded category, Standalone Project and press Next.
Digilent Cerebot MC7 Quick Start Guide
This section contains a description of the steps required to run the AD5541A demonstration project on a Digilent Cerebot MC7 platform.
Required Hardware
Required Software
Hardware Setup
A PmodDA3 has to be connected to the JB connector of Cerebot MC7 development board.
Reference Project Overview
Following commands were implemented in this version of AD5541A reference project for Cerebot MC7 board.
Command | Description |
help? | Displays all available commands. |
voltage= | Sets the DAC output voltage. Accepted values: 0 - 2.5 |
voltage? | Displays last written value. |
register= | Writes to the DAC register. Accepted values: 0 - 65535. |
register? | Displays last written value. |
Commands can be executed using a serial terminal connected to the UART1 peripheral of dsPIC33FJ128MC706A.
The following image shows a list of commands in a serial terminal connected to processor’s UART peripheral.
Software Project Setup
This section presents the steps for developing a software application that will run on the Digilent Cerebot MC7 development board for controlling and monitoring the operation of the ADI part.
Run the MPLAB X integrated development environment.
Choose to create a new project.
In the Choose Project window select Microchip Embedded category, Standalone Project and press Next.