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AD5541A-适用于微芯片微控制器平台的无操作系统驱动程序

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资料介绍

This version (24 Jul 2013 08:49) was approved by Dragos Bogdan.The Previously approved version (09 Oct 2012 09:11) is available.

AD5541A - No-OS Driver for Microchip Microcontroller Platforms

Supported Devices

Evaluation Boards

Overview

The AD5541A, AD5600 are 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.

Offering unbuffered outputs, the AD5541A, AD5600 achieve a 1 μs settling time with low power consumption and low offset errors. Providing low noise performance of 11.8 nV/√Hz and low glitch, the AD5541A, AD5600 are suitable for deployment across multiple end systems.

The AD5541A, AD5600 use a versatile 3-wire interface that is compatible with a 50 MHz SPI, QSPI™, MICROWIRE™, and DSP interface standards.

Applications

Automatic test equipment
Precision Source-measure Instruments
Data Acquisition Systems
Medical Instrumentation
Aerospace Instrumentation
Communications Infrastructure equipment
Industrial Control

01 Oct 2012 10:36 · 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 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.

SPI driver architecture

The following functions are implemented in this version of AD5541A driver:

Function	Description
char AD5541A_Init(void)	Initializes the communication peripheral and configures LDAC pin.
void AD5541A_SetRegisterValue(unsigned short registerValue)	Sends to DAC register through SPI the 16-bit data-word.
float AD5541A_SetVoltage(float outVoltage, float vRef)	Sets the output voltage.

01 Oct 2012 15:13 · Dragos Bogdan

HW Platform(s):

Downloads

AD5541A DSPIC33 Driver
AD5541A chipKIT Driver
AD5541A Driver: https://github.com/analogdevicesinc/no-OS/tree/master/drivers/AD5541A
PmodDA3 Demo for PIC32MX320F128H: https://github.com/analogdevicesinc/no-OS/tree/master/Microchip/PIC32MX320F128H/PmodDA3
PIC32MX320F128H Common Drivers: https://github.com/analogdevicesinc/no-OS/tree/master/Microchip/PIC32MX320F128H/Common

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

MPLAB X Integrated Development Environment
MPLAB XC32 compiler
The AD5541A demonstration project for PIC32MX320F128H.

The AD5541A demonstration project for PIC32MX320F128H consists of three parts: the AD5541A Driver, the PmodDA3 Demo for PIC32MX320F128H and the PIC32MX320F128H Common Drivers.

All three parts have to be downloaded.

Hardware Setup

A PmodDA3 has to be connected to the JE connector of Cerebot MX3cK development board.

Reference Project Overview

The 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 .. 2500 - desired output voltage in milivolts.
voltage?	Displays last written voltage value to the DAC.
register=	Writes to the DAC register. Accepted values: 0 .. 65535 - the value written to the DAC.
register?	Displays last written value in the DAC register.

Commands can be executed using a serial terminal connected to the UART1 peripheral of PIC32MX320F128H.

The following image shows a generic 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.

In the Select Device window choose PIC32MX320F128H device and press Next.

In the Select Tool window select the desired hardware tool and press Next.

In the Select Compiler window chose the XC32 compiler and press Next.

In the Select Project Name and Folder window choose a name and a location for the project.

After the project is created, all the downloaded source files have to be copied in the project folder and included in the project.

The project is ready to be built and downloaded on the development board.

05 Jul 2012 14:45