研究32位Cortex-M3 MCU開(kāi)發(fā)技術(shù)

　　德州儀器（TI）公司Stellaris?所提供一系列的微控制器是首款基于ARM? CortexTM-M3的控制器，它們?yōu)閷?duì)成本尤其敏感的嵌入式微控制器應(yīng)用方案帶來(lái)了高性能的32位運(yùn)算能力。這些具備領(lǐng)先技術(shù)的芯片使用戶能夠以傳統(tǒng)的8位和16位器件的價(jià)位來(lái)享受32位的性能，而且所有型號(hào)都是以小占位面積的封裝形式提供。

　　LM3S9B96微控制器的優(yōu)勢(shì)還在于能夠方便的運(yùn)用多種ARM的開(kāi)發(fā)工具和片上系統(tǒng)（SoC）的底層IP應(yīng)用方案，以及廣大的用戶群體。另外，該微控制器使用了兼容ARM Thumb?的Thumb2指令集來(lái)減少存儲(chǔ)容量的需求，并以此達(dá)到降低成本的目的。最后，LM3S9B96微控制器與Stellaris?系列的所有成員是代碼兼容的，這為用戶提供了靈活性，能夠適應(yīng)各種精確的需求。

　　為了能夠幫助用戶產(chǎn)品快速的上市，德州儀器（TI）公司提供了一整套的解決方案，包括評(píng)估和開(kāi)發(fā)板、白皮書(shū)和應(yīng)用筆記、方便使用的外設(shè)驅(qū)動(dòng)程序庫(kù)、以及強(qiáng)大的支持、銷售和分銷商網(wǎng)絡(luò)。

　　LM3S9B96目標(biāo)應(yīng)用：

　　The Stellaris family is positioned for cost-conscious applications requiring significant control processing and connectivity capabilities such as:

　　Remote monitoring

　　Electronic point-of-sale （POS） machines

　　Test and measurement equipment

　　Network appliances and switches

　　Factory automation

　　HVAC and building control

　　Gaming equipment

　　Motion control

　　Medical instrumentation

　　Fire and security

　　Power and energy

　　Transportation

　
圖1.Stellaris LM3S9B96方框圖

　　圖2.Stellaris LM3S9B96 Cortex-M3處理器方框圖

　　Stellaris? LM3S9B96開(kāi)發(fā)板

　　The Stellaris? LM3S9B96 Development Board provides a platform for developing systems around the advanced capabilities of the LM3S9B96 ARM? Cortex?-M3-based microcontroller.

　　The LM3S9B96 is a member of the Stellaris Tempest-class microcontroller family. Tempest-class devices include capabilities such as 80 MHz clock speeds, an External Peripheral Interface （EPI） and Audio I2S interfaces. In addition to new hardware to support these features, the DK-LM3S9B96 board includes a rich set of peripherals found on other Stellaris boards.

　　The development board includes an on-board in-circuit debug interface （ICDI） that supports both JTAG and SWD debugging. A standard ARM 20-pin debug header supports an array of debugging solutions.

　　The Stellaris? LM3S9B96 Development Kit accelerates development of Tempest-class microcontrollers. The kit also includes extensive example applications and complete source code.

LM3S9B96開(kāi)發(fā)板主要特性：

　　The Stellaris? LM3S9B96 Development Board includes the following features.

　　Simple set-up—USB cable provides debugging, communication, and power

　　Flexible development platform with a wide range of peripherals

　　Color LCD graphics display

　　– TFT LCD module with 320 x 240 resolution

　　– Resistive touch interface

　　80 MHz LM3S9B96 microcontroller with 256 K Flash, 96 K SRAM, and integrated Ethernet MAC+PHY, USB OTG, and CAN communications

　　– – 8 MB SDRAM （plug-in EPI option board）

　　– – EPI break-out board （plug-in option board）

　　1 MB serial Flash memory

　　Precision 3.00 V voltage reference

　　SAFERTOS? operating system in microcontroller ROM

　　I2S stereo audio codec

　　– Line In/Out

　　– Headphone Out

　　– Microphone In

　　Controller Area Network （CAN） Interface

　　10/100 BaseT Ethernet

　　USB On-The-Go （OTG） Connector

　　– Device, Host, and OTG modes

　　User LED and push button

　　Thumbwheel potentiometer （can be used for menu navigation）

　　MicroSD card slot

　　Supports a range of debugging options

　　– Integrated In-circuit Debug Interface （ICDI）

　　– JTAG, SWD, and SWO all supported

　　– Standard ARM? 20-pin JTAG debug connector

　　USB Virtual COM Port

　　Jumper shunts to conveniently reallocate I/O resources

　　Develop using tools supporting Keil? RealView? Microcontroller Development Kit （MDK-ARM）， IAR Embedded Workbench, Code Sourcery GCC development tools, Code Red Technologies development tools, or Texas Instruments’ Code Composer Studio? IDE

　　Supported by StellarisWare? software including the graphics library, the USB library, and the peripheral driver library

　　An optional Flash and SRAM memory expansion board （DK-LM3S9B96-EXP-FS8） is also available for use with the DK-LM3S9B96 development board

　　– Works with the External Peripheral Interface （EPI） of the Stellaris microcontroller

　　– Provides Flash memory, SRAM, and an improved performance LCD interface

　　LM3S9B96開(kāi)發(fā)板包括：

　　The Stellaris? LM3S9B96 Development Kit contains everything needed to develop and run a range of applications using Stellaris microcontrollers:

　　LM3S9B96 development board

　　8 MB SDRAM expansion board

　　EPI signal breakout board

　　Retractable Ethernet cable

　　USB Mini-B cable for debugger use

　　USB Micro-B cable for OTG-to-PC connection

　　USB Micro-A to USB A adapter for USB Host

　　USB Flash memory stick

　　microSD Card

　　20-position ribbon cable

　　CD containing:

　　– A supported version of one of the following （including a toolchain-specific Quickstart

　　guide）：

　　Keil? RealView? Microcontroller Development Kit （MDK-ARM）

　　IAR Embedded Workbench

　　Code Sourcery GCC development tools

　　Code Red Technologies development tools

　　Texas Instruments’ Code Composer Studio? IDE

　　– Complete documentation

　　– Quickstart application source code

　　– Stellaris? Firmware Development Package with example source code

圖3.LM3S9B96開(kāi)發(fā)板外形圖

圖4.DK-LM3S9B96開(kāi)發(fā)板方框圖

圖5.DK-LM3S9B96開(kāi)發(fā)板電路圖(1)

圖6.DK-LM3S9B96開(kāi)發(fā)板電路圖(2)

圖7.DK-LM3S9B96開(kāi)發(fā)板電路圖(3)

圖8.DK-LM3S9B96開(kāi)發(fā)板電路圖(4)

圖9.DK-LM3S9B96開(kāi)發(fā)板電路圖(5)

圖10.DK-LM3S9B96開(kāi)發(fā)板電路圖(6)

圖11.用于DK-LM3S9B96的FLASH/SRAM/LCD IF擴(kuò)展板電路圖(1)

　　圖12.用于DK-LM3S9B96的FLASH/SRAM/LCD IF擴(kuò)展板電路圖（2）