AD9838-微控制器无操作系统驱动程序

消耗积分:2 | 格式:pdf | 大小:1.48MB | 2021-04-22

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This version (24 Jan 2021 18:42) was approved by Dragos Bogdan.The Previously approved version (04 Jan 2019 14:20) is available.

AD9838 - Microcontroller No-OS Driver

Supported Devices

AD9838

Evaluation Boards

EVAL-AD9838

Overview

The AD9838 is a low power DDS device capable of producing high performance sine and triangular outputs. It also has an on-board comparator that allows a square wave to be produced for clock generation. Consuming only 11 mW of power at 2.3 V the AD9838 is an ideal candidate for power-sensitive applications. Capability for phase modulation and frequency modulation is provided. The frequency registers are 28 bits; with a 16 MHz clock rate, resolution of 0.06 Hz can be achieved; with a 5 MHz clock rate, the AD9838 can be tuned to 0.02 Hz resolution. Frequency and phase modulation are configured by loading registers through the serial interface and toggling the registers using software or the FSELECT pin and PSELECT pin, respectively.

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 AD9838 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 AD9838 driver can be used exactly as it is provided.

There are three functions which are called by the AD9838 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 AD9838 driver:

Function	Description
unsigned char AD9838_Init(void))	Initializes the SPI communication peripheral and resets the part.
void AD9838_Reset(void)	Sets the Reset bit of the AD9838.
void AD9838_ClearReset(void)	Clears the Reset bit of the AD9838.
void AD9838_SetRegisterValue(unsigned short regValue)	Writes the value to a register.
void AD9838_SetFrequency(unsigned short reg, unsigned long val)	Writes to the frequency registers.
void AD9838_SetPhase(unsigned short reg, unsigned short val)	Writes to the phase registers.
void AD9838_Setup(unsigned short freq, unsigned short phase, unsigned short type, unsigned short commandType)	Selects the Frequency,Phase and Waveform type.

Downloads

No-OS Driver:
- Implementation of AD9838 Driver.
- Header file of AD9838 Driver.
Older Drivers:

Renesas RL78G13 Quick Start Guide

This section contains a description of the steps required to run the AD9838 demonstration project on a Renesas RL78G13 platform.

Required Hardware

Required Software

Hardware Setup

An EVAL-AD9838SDZ board has to be interfaced with the Renesas Demonstration Kit (RDK) for RL78G13:

  EVAL-AD9838SDZ test point FSYNC            → YRDKRL78G13 J11 connector Pin 1
  EVAL-AD9838SDZ test point SDATA            → YRDKRL78G13 J11 connector Pin 2
  EVAL-AD9838SDZ test point SCLK             → YRDKRL78G13 J11 connector Pin 4
  EVAL-AD9838SDZ test point FSEL1            → YRDKRL78G13 J11 connector Pin 10
  EVAL-AD9838SDZ J2 connector connector DGND → YRDKRL78G13 J11 connector Pin 5
  EVAL-AD9838SDZ J2 connector connector DVDD → YRDKRL78G13 J11 connector Pin 6
  EVAL-AD9838SDZ J3 connector connector AGND → YRDKRL78G13 J11 connector Pin 5
  EVAL-AD9838SDZ J3 connector connector AVDD → YRDKRL78G13 J11 connector Pin 6

Software Setup

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

CSI10 (Clocked Serial Interface 10) – For the AD9838 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 3
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:

Choose for the Watchdog timer operation setting: Unused option.

Reference Project Overview

The demo program sets up the AD9838 part to output sinusoidal, triangle and square waves. The frequency and the type of wave are displayed 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.

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