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電子發燒友網>電子資料下載>類型>參考設計>AD7328-微控制器無操作系統驅動程序

AD7328-微控制器無操作系統驅動程序

2021-05-22 | pdf | 714.21KB | 次下載 | 2積分

資料介紹

This version (25 Jan 2021 05:28) was approved by Robin Getz.The Previously approved version (09 Oct 2012 13:14) is available.Diff

AD7328 - Microcontroller No-OS Driver

Supported Devices

Evaluation Boards

Overview

AD7328

The AD7328 is an 8-channel, 12-bit plus sign, successive approximation ADC designed on the iCMOS (industrial CMOS) process. iCMOS is a process combining high voltage silicon with submicron CMOS and complementary bipolar technologies. It enables the development of a wide range of high performance analog ICs capable of 33 V operation in a footprint that no previous generation of high voltage parts could achieve. Unlike analog ICs using conventional CMOS processes, iCMOS components can accept bipolar input signals while providing increased performance, dramatically reduced power consumption, and reduced package size. The AD7328 can accept true bipolar analog input signals. The AD7328 has four software-selectable input ranges, ±10 V, ±5 V, ±2.5 V, and 0 V to +10 V. Each analog input channel can be independently programmed to one of the four input ranges. The analog input channels on the AD7328 can be programmed to be single-ended, true differential, or pseudo differential. The ADC contains a 2.5 V internal reference. The AD7328 also allows for external reference operation. If a 3 V reference is applied to the REFIN/OUT pin, the AD7328 can accept a true bipolar ±12 V analog input. Minimum ±12 V VDD and VSS supplies are required for the ±12 V input range. The ADC has a high speed serial interface that can operate at throughput rates up to 1 MSPS.

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 AD7328 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 AD7328 driver can be used exactly as it is provided.

There are three functions which are called by the AD7328 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 AD7328 driver:

Function Description
unsigned char AD7328_Init(unsigned char internalRef, unsigned char coding) Initializes AD7328.
void AD7328_SetRegisterValue(unsigned char registerAddress, unsigned short registerValue) Writes data into a register.
void AD7328_SetRange(unsigned char channel, unsigned char range) Select one analog input range per analog input channel.
void AD7328_SequenceSetup(unsigned char sequenceMode, unsigned short channelSequence) Configures the channel sequence feature.
void AD7328_SetPower(unsigned char powerMode) Selects a power mode of the AD7328.
void AD7328_ChannelSetup(unsigned char channelMode, unsigned char channelIndex) Selects the configuration of the eight analog inputs and selects the analog input channel for the next conversion.
void AD7328_SampleRead(unsigned short *sampleValue, unsigned char *channelId) Reads one sample from the device.
float AD7328_CalcVoltage(unsigned short value, unsigned char chIndex, float vRef) Converts the raw data read from a channel to volts.

Downloads

Renesas RL78G13 Quick Start Guide

This section contains a description of the steps required to run the AD7328 demonstration project on a Renesas RL78G13 platform.

Required Hardware

Required Software

Hardware Setup

An EVAL-AD7328SDZ has to be interfaced with the Renesas Demonstration Kit (RDK) for RL78G13:

  EVAL-AD7328SDZ Pin CS     →  YRDKRL78G13 J11 connector Pin 1
  EVAL-AD7328SDZ Pin DIN    →  YRDKRL78G13 J11 connector Pin 2
  EVAL-AD7328SDZ Pin DOUT   →  YRDKRL78G13 J11 connector Pin 3
  EVAL-AD7328SDZ Pin SCLK   →  YRDKRL78G13 J11 connector Pin 4
  EVAL-AD7328SDZ Pin GND    →  YRDKRL78G13 J11 connector Pin 5
  

Reference Project Overview

The reference project samples the input voltage on channels 0 through 6 and displays the values on the LCD.

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.

  • 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
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