MSP430_SMBus_Users_Guide-1_10_00_00

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SMBus Library for MSP430G2xx3Devices User’s GuideDOCNUM-1.10.00.00Copyright©2015T exas Instruments Incorporated.1 CopyrightCopyright©2015Texas Instruments Incorporated.All rights reserved.MSP430and MSP430Ware are trademarks of Texas Instruments Instruments. ARM and Thumb are registered trademarks and Cortex is a trademark of ARM Limited.Other names and brands may be claimed as the property ofbe aware that an important notice concerning availability,standard warranty,and use in critical applications of Texas Instruments semi-conductor products and disclaimers thereto appears at the end of this document.Texas Instruments13532N.Central Expressway MS3810Dallas,TX75243/Revision InformationThis is version1.10.00.00of this document,last updated on Fri Feb13201511:59:44.Table of Contents2Table of ContentsCopyright (1)Revision Information (1)1Introduction (3)1.1Introduction (3)1.2SMBus (3)1.3The MSP430™SMBus Library Package (4)2Introduction to the MSP430™SMBus API (5)2.1Overview (5)2.2Supported Device Families (5)2.3Supported Development Environments (5)2.4Stack Organization (5)2.5Usage of MCU Peripheral Resources (6)2.6Release Notes and Migration from Previous Versions (6)3SMBus API Usage (7)3.1Introduction (7)3.2Usage (7)3.3Examples (8)IMPORTANT NOTICE (9)1Introduction1.1IntroductionThs SMBus(Sytem Management Bus)API(application programming interface)stack forMSP430™microcontrollers is a turnkey API.It includes support for applications where theMSP430™microcontroller is acting as the master or a slave.The API is designed to minimize the SMBus knowledge required to write an application:All SMBus protocol is handled automatically by the APIThe data interface presented to the application is simple to use,abstracting the applicationfrom SMBus protocolThe user should not need to modify the API source.However,for experienced developers,thesource is open and available for editing.Accessing the API’s source can also be useful for systemdebug.Application examples are included in the MSP430™SMBus Library Package.1.2SMBusThe System Management Bus(SMBus)is a lightweight two-wire interface based on the principlesof I2C,commonly used as a control bus and for power management tasks in computing,mobilecomputing and battery operated applications.A device performing data transfers on the bus canbe considered a master,which is the device which initiates a transaction and drives the clock,or aslave,which is the target of a SMBus transaction driven by the master.Both the master and theslave can act as transmitters or as receivers.SMBus2.0shares a lot of similarities with I2C,but some of the most relevant differences include:Time-out detection when a device stretches the clock for too longPacket Error Checking(PEC)can be optionally appended at the end of each transaction,allowing the bus to automatically validate packetsI2C only defines a PHY and Data-Link layers,but SMBus defines a network layer withdifferent SMBus protocols which can be used to exchange data between devicesOptional use of additional lines such as SMBAlert#and SMBSUS#.For more information about SMBus,please refer to the SMBus2.0specification:/specs/.For more information about I2C,please refer to/documents/user manual/UM10204.pdf1.2.1Supported FeaturesThe following table details the SMBus features supported in the MSP430™SMBus library.SMBus Feature MSP430FR5xx6xx MSP430G2xx3Applicable SMBus2.0 Master Slave Master Slave specification sectionClock Timeout detection1Y es Y es Y es1Y es1 3.1.1.2Manual NACK on invalid address/data N/A Y es2N/A No 4.2Arbitration Y es N/A Y es N/A 4.3.2Clock stretching Y es Y es Y es Y es 4.3.3Multiple Slave address N/A No N/A No 5.2General Call address N/A No N/A No 5.2PEC Y es Y es Y es Y es 5.4Quick Command Partial3Partial3Parial3Partial3 5.5.1Send Byte Y es Y es Y es Y es 5.5.2Receive Byte Y es Y es Y es Y es 5.5.3Write Byte/Word Y es Y es Y es Y es 5.5.4Read Byte/Word Y es Y es Y es Y es 5.5.5Process Call Y es Y es Y es Y es 5.5.6Block Write/Read Y es Y es Y es Y es 5.5.7Block write-block read process call Y es Y es Y es Y es 5.5.8Host notify protocol No No No No 5.5.9ARP No No No No 5.6SMBAlert#No No No No Appendix ASMBSUS#No No No No Appendix ANotes:1.MSP430G2xx3USCI doesn’t have integrated timeout detection and requires a timer2.MSP430FR5x/6xx can optionally-use DMA to stretch SCL while deciding to ACK/NACK thecurrent byte3.Only QuickCommand Write is supported,not QuickCommand Read1.3The MSP430™SMBus Library PackageThis User’s Guide documents the SMBus API and examples.The contents of the package isdescribed below:smbuslib:T op level directory.Contains release notes and the manifestfile related to licensing.•docs:Contains the API and User’s Guides for the supported MSP430™devices•driverlib:Contains the standard MSP430™driverlib which is used in the libraryimplementation for device families that support driverlib(for example,MSP430FR5xx6xx)•examples:Contains the example projects for each of the supported MSP430™devices•src:Contains the source code for the SMBus Library stack2Introduction to the MSP430™SMBus API 2.1OverviewThe MSP430™SMBus API stack allows easy creation of MSP430™applications thatcommunicate with other system components over a SMBus interface.This API supports using the MSP430™microcontroller as the SMBus master or as a SMBusslave.2.2Supported Device FamiliesThe SMBus API stack is supported on the following MSP430™device families:MSP430FR5xx6xxMSP430G2xx32.3Supported Development EnvironmentsThe SMBus API stack and examples build and run on both the IAR and CCS environments forMSP430™microcontrollers.See the Release Notes HTMLfile in the SMBus Library Package forspecific IAR/CCS version information.IAR and CCS are both available in free,code-size-limited versions(8K and16K,respectively,ofobject code).Applications thatfit under8K of memory can be run on both free versions.Applications that are greater than8K cannot be built using the free IAR Kickstart tool.Instead,thefree version of CCS can be used;or a licensed version of either environment.See the Release Notes within the SMBus Library Package zipfile for additional informationspecific to a given release.2.4Stack OrganizationThe software stack is organized into three layers:The public API layer defines the API’s that should be called by application programs.Thesefunctions are defined in smbus.h.The network layer manages the SMBus protocol state machine and interfaces with thephysical layer.These functions are defined in smbus nwk.h and should not be called directlyfrom application programs.The physical layer contain all the device specific code to interact with the MSP430™microcontroller.These functions are defined in smbus phy.h and should not be called directlyfrom application programs.2.5Usage of MCU Peripheral ResourcesWithin the SMBus API,the resources shown below are considered owned by the API.If theapplication accesses them,it should be aware of how the API uses them.2.6Release Notes and Migration from Previous VersionsA Release Notes HTMLfile accompanies each release of the SMBus Library Package.Referencethisfile for any information specific to this release,including:All changes from the previous versionsInstructions for migration from previous versionsUpdated IDE configuration informationKnown issues3SMBus API Usage3.1IntroductionThis chapter contains the detailed documentation for the application API functions anddescriptions on using the API to create a SMBus master or slave application.3.2UsageThis section illustrates the basic application template for master and slave applications.See theexamples for complete applications,and the HTML API documentation for details on theindividual APIs.3.2.1Master Usage Outline//Declare master SMBus structureSMBus SMB;//Initialize GPIOs and clocks...//Initialize GPIO I2C pins...//Initialize SMBus Master always at100kbps per SMBus specSMBus masterInit(&SMB,NULL,(MCLK MHZ*1000000));//Initialize I2C and enable SMBus InterruptsSMBus masterEnableInt(&SMB);//Send SMBus Sendbyte command(0x33)uint8t ret=SMBus masterSendByte(&SMB,//SMB struct0x40,//Slave Addr0x33);//SMB Command...3.2.2Slave Usage Outlinemain(){//Declare slave SMBus structureSMBus SMB;//SMBus receive and transmit buffersuint8t au8RxBuff[SMB MAX PACKET SIZE];uint8t au8TxBuff[SMB MAX PACKET SIZE];//Initialize GPIOs and clocks...//Initialize GPIO I2C pins...//Initialize SMBus SlaveSMBus slaveInit(&SMB,NULL);//Set the slave’s addressSMBus slaveSetAddress(&SMB,0x40);//Set the RX and TX buffers for SMBusSMBus slaveSetRxBuffer(&SMB,au8RxBuff,sizeof(au8RxBuff));SMBus slaveSetTxBuffer(&SMB,au8TxBuff,sizeof(au8TxBuff));//Initialize I2C and enable SMBus InterruptsSMBus slaveEnableInt(&SMB);...while(1){disable interrupt();{BIS SR(LPM3bits+GIE);//Go to sleep}enable interrupt();}//While(1)}#pragma vector=USCIAB0TX VECTOR,USCIAB0RX VECTORinterrupt void USCI ISR(void){//Check the state of SMBusswitch(SMBus slaveProcessInt(&SMB)){case SMBus State Slave QCMD://If a Quick command was detected,execute function(if any)break;case SMBus State Slave CmdComplete://Get command using SMBus slaveGetCommand(&SMB)and process command//if command is not valid/supported//SMBus slaveReportError(&SMB,SMBUS ErrorCode Cmd);LPM3EXIT;//Exit to main loop if requiredbreak;default:break;}//Clear flags to be ready for next packetSMBus processDone(&SMB);}#pragma vector=TIMER1A0VECTORinterrupt void TIMER1A0ISR(void){//Call the SMBUS function to handle a timeout error and restart the SMBUSSMBus slaveProcessTimeoutInt(&SMB);}3.3ExamplesSeveral examples are provided with the release package that illustrate using the library toimplement both SMBus master and slave application.For each example,matching master and slave implementations are provided.ReadByte Echo-sends and echoes back a ReadByte commandWriteWord Dimmer-sends and echoes back a WriteWord commandAllProtocols-sequences through all the SMBus protocolsExamples are configured for the MSP-EXP430G2and MSP-EXP430FR5969launch pad boardsand CCS and IAR projects are provided.9 IMPORTANT NOTICET exas Instruments Incorporated and its subsidiaries(TI)reserve the right to make corrections,modifications,enhancements,improvements, and other changes to its products and services at any time 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MSP430混合信号微控制器数据手册产品特性●低电压范围：2.5V～5.5V●超低功耗——活动模式：330μA at 1MHz, 3V——待机模式：0.8μA——掉电模式（RAM数据保持）：0.1μA●从待机模式唤醒响应时间不超过6μs●16位精简指令系统，指令周期200ns●基本时钟模块配置——多种内部电阻——单个外部电阻——32kHz晶振——高频晶体——谐振器——外部时钟源●带有三个捕获/比较寄存器的16位定时器（Timer_A）●串行在线可编程●采用保险熔丝的程序代码保护措施●该系列产品包括——MSP430C111：2K字节ROM，128字节RAM——MSP430C112：4K字节ROM，256字节RAM——MSP430P112：4K字节OTP，256字节RAM●EPROM原型——PMS430E112：4KB EPROM, 256B RAM●20引脚塑料小外形宽体（SOWB）封装，20引脚陶瓷双列直插式（CDIP）封装（仅EPROM）●如需完整的模块说明，请查阅MSP430x1xx系列用户指南（文献编号：SLAU049产品说明TI公司的MSO43O系列超低功耗微控制器由一些基本功能模块按照不同的应用目标组合而成。

在便携式测量应用中，这种优化的体系结构结合五种低功耗模式可以达到延长电池寿命的目的。

MSP430系列的CPU采用16位精简指令系统，集成有16位寄存器和常数发生器，发挥了最高的代码效率。

它采用数字控制振荡器（DCO），使得从低功耗模式到唤醒模式的转换时间小于6μs.MSP430x11x系列是一种超低功耗的混合信号微控制器，它拥有一个内置的16位计数器和14个I/0引脚。

典型应用：捕获传感器的模拟信号转换为数据，加以处理后输出或者发送到主机。

作为独立RF传感器的前端是其另一个应用领域。

DW封装（顶视图）可用选型功能模块图管脚功能简介：1.CPUMSP430的CPU采用16位RISC架构，具有高度的应用开发透明性。

MSP430教程1：MSP430 单片机系列简介1、MSP430 单片机的发展MSP430 系列是一个 16 位的、具有精简指令集的、超低功耗的混合型单片机，在 1996 年问世，由于它具有极低的功耗、丰富的片内外设和方便灵活的开发手段，已成为众多单片机系列中一颗耀眼的新星。

回忆 MSP430 系列单片机的发展过程，可以看出有这样三个阶段：开始阶段从 1996 年推出 MSP430 系列开始到 2000 年初，这个阶段首先推出有 33X 、32X 、 31X 等几个系列，而后于 2000 年初又推出了 11X 、 11X1 系列。

MSP430 的 33X 、 32X 、 31X 等系列具有 LCD 驱动模块，对提高系统的集成度较有利。

每一系列有 ROM 型（ C ）、 OTP 型（ P ）、和 EPROM 型（ E ）等芯片。

EPROM 型的价格昂贵，运行环境温度范围窄，主要用于样机开发。

这也表明了这几个系列的开发模式，即：用户可以用 EPROM 型开发样机；用 OTP 型进行小批量生产；而 ROM 型适应大批量生产的产品。

2000 年推出了 11X/11X1 系列。

这个系列采用 20 脚封装，内存容量、片上功能和 I/O 引脚数比较少，但是价格比较低廉。

这个时期的 MSP430 已经显露出了它的特低功耗等的一系列技术特点，但也有不尽如人意之处。

它的许多重要特性，如：片内串行通信接口、硬件乘法器、足够的 I/O 引脚等，只有33X 系列才具备。

33X 系列价格较高，比较适合于较为复杂的应用系统。

当用户设计需要更多考虑成本时， 33X 并不一定是最适合的。

而片内高精度 A/D 转换器又只有 32X 系列才有。

寻找突破，引入 Flash 技术随着 Flash 技术的迅速发展， TI 公司也将这一技术引入 M SP430 系列中。

在 2000 年 7 月推出 F13X/F14X 系列，在 2001 年 7 月到 2002 年又相继推出 F41X 、 F43X 、 F44X 这些全部是 Flash 型单片机。

第 2 章MSP430 单片机原理与 C 语言基础MSP430系列超低功耗单片机有200多种型号，TI公司用3~ 4位数字表示其型号。

其中第一位数字表示大系列，如MSP430F1xx系列、MSP430F2xx系列、MSP430F4xx系列、MSP430F5xx系列等。

在每个大系列中，又分若干子系列，单片机型号中的第二位数字表示子系列号，一般子系列越大，所包含的功能模块越多。

最后1~2 位数字表示存储容量，数字越大表示RAM 和ROM 容量越大。

430 家族中还有针对热门应用而设计的一系列专用单片机。

如SP430FW4xx 系列水表专用单片机、MSP430FG4xx 系列医疗仪器专用单片机、MSP430FE4xx 系列电能计量专用单片机等。

这些专用单片机都是在同型号的通用单片机上增加专用模块而构成的。

最新的MSP430型号列表可以通过TI公司网站下载。

在开发单片机应用系统时，第一步就是单片机的选型，选择合适的单片机型号往往就能事半功倍。

单片机选型基本方法是选择功能模块最接近项目需求的系列，然后根据程序复杂程度估算存储器和RAM 空间，并留有适当的余量，最终决定选用的单片机型号。

本章节以MSP430F249单片机为学习目标，介绍单片机的基本结构和工作原理，读者可以举一反三、触类旁通，而不必每种型号都去学习却无法深入掌握。

2.1 MSP430F249单片机基本结构与原理2.1.1MSP430F249的主要结构特点供电电压范围1.8V~3.6V 。

超低功耗：活动状态270uA（1MHz，2.2V）;待机模式0.3uA;关机模式0.1uA。

16位RISC精简指令集处理器。

时钟系统：多种时钟源，可灵活使用。

时钟频率达到16MHz ;具有内部振荡器;可外接32kHz 低频晶振;外接时钟输入。

12位A/D转换器，内部参考电压，采用保持电路。

16位定时器A，3个捕获/比较寄存器。

16 位定时器B，7 个捕获/比较寄存器。

MSP430入门硬件初步这只是我在学习TI公司生产的16位超的功耗单片机MSP430的随笔，希望能对其他朋友有所借鉴，不对之处还请多指教。

下面，开始430之旅。

讲解430的书现在也有很多了，不过大多数都是详细说明底层硬件结构的，看了不免有些空洞和枯燥，我认为了解一个MCU的操作首先要对其基础特性有所了解，然后再仔细研究各模块的功能。

1.首先你要知道msp430的存储器结构。

典型微处理器的结构有两种：冯。

诺依曼结构——程序存储器和数据存储器统一编码；哈佛结构——程序存储器和数据存储器；msp430系列单片机属于前者，而常用的mcs51系列属于后者。

0－0xf特殊功能寄存器；0x10－0x1ff外围模块寄存器；0x200－？根据不同型号地址从低向高扩展；0x1000－0x107f seg_b0x1080_0x10ff seg_a 供flash信息存储剩下的从0xffff开始向下扩展，根据不同容量，例如149为60KB，0xffff－0x11002.复位信号是MCU工作的起点，430的复位信号有两种：上电复位信号POR和上电清除信号PUC。

POR 信号只在上电和RST/NMI复位管脚被设置为复位功能，且低电平时系统复位。

而PUC信号是POR信号产生，以及其他如看门狗定时溢出、安全键值出现错误是产生。

但是，无论那种信号触发的复位，都会使msp430在地址0xffff处读取复位中断向量，然后程序从中断向量所指的地址开始执行。

复位后的状态不写了，详见参考书，嘿嘿。

3.系统时钟是一个程序运行的指挥官，时序和中断也是整个程序的核心和中轴线。

430最多有三个振荡器，DCO内部振荡器；LFXT1外接低频振荡器，常见的32768HZ，不用外接负载电容；也可接高频450KHZ －8M，需接负载电容；XT2接高频450KHZ－8M，加外接电容。

（经验中发现，接XT2时，需要注意自己开启XT2，并延时50us等待XT2起振，然后手工清除IFG1中的OFIFG位，其操作顺序为：打开XT2->等待XT2稳定->切换系统时钟为XT2）430有三种时钟信号：MCLK系统主时钟，可分频1 2 4 8，供cpu使用，其他外围模块在有选择情况下也可使用；SMCLK系统子时钟，供外围模块使用，可选则不同振荡器产生的时钟信号；ACLK辅助时钟，只能由LFXT1产生，供外围模块。

1.关于目标板供电，这个问题反映回来最多。

如果用仿真器供电，那么VCCI脚一定要接地。

VCCI是仿真器检测目标板电源的。

如果跟VCCO 接在一起，很可能导致仿真器不输出电压，导致IAR报错，找不到芯片。

如果用外部电源供电，那么VCCI一定要接到目标板电源(一般是3.3V)，VCCO悬空，一定不要跟目标板电源相连，否则，有时可能会导致仿真器输出，两个电源短路，出现意想不到的情况；2. 系统中显示USB设备有问题：这个问题有可能是USB没有安装好，有时也可能系统问题。

如果驱动装好了。

电脑重启一下可能就好了。

如果还不行。

换台电脑再试一下。

3. 有时430单片机可能在死机状态，导致仿真器通过JTAG查询时，没有响应，导致IAR不能下载。

这时，拔掉JTAG 14pin插座，断开目标板电源，过至少1min时间，最好用镊子把目标板电源放电完，再插上JTAG插座，进行仿真。

4. 判断仿真器是否正常的一个简单的办法是：a) 硬件管理器中USB 设备工作正常(显示为msp430uif COMx口)。

b), 插入USB后，电脑有识别到新硬件的声音指示（开外放）代表仿真器自检通过。

那么仿真器一般不会有问题了。

重点在目标板上找原因,一般是不会有问题的。

5. 安装MSP430的LSD-FET430UIF USB仿真器驱动时出错。

"INF 找不到所需的段落" 的解决方法：首先这是您操作系统的问题a.打开“控制面板–管理工具–服务”，查看“smart card是否启用”，没有的话，请手动启动。

如果“smart card”服务也无法启用，可检查“scardsvr”服务是否存在，且已经启动，如果没有启动请手动启动，然后设为“自动”。

b.如果该服务不存在，则按以下步骤操作，单击“开始–运行”输入cmd 打开命令提示符窗口，先执行命令“scardsvr reinstall”，接着在执行命令“regsvr32 scardssp.dll”重新注册scardssp.dll。

目录目录 (I)实验一I/O端口控制实验 (1)实验二乘法器实验 (2)实验三PWM脉冲实验 (3)实验四LED数码显示实验 (4)实验五LCD段码屏显示实验 (6)实验六定时器实验 (8)实验七比较器实验 (10)实验八内部看门狗实验 (13)实验九电子时钟实验 (15)实验十独立键盘实验 (16)实验十一阵列键盘实验 (17)实验十二时钟模块FLL+操作实验 (18)实验十三 12位AD转换实验 (19)实验十四外部FLASH扩展实验 (20)实验十五I2C AT24C02实验 (22)实验十六 128×64点阵液晶显示实验（选配） (24)实验十七 RS-232通信实验 (25)IMSP430核心板的供电方式MSP430核心板有2种供电方式：1．由USB取提供，同时J0短路冒打在右边，J1短路冒打在左边，J6短路冒打在上方。

2．由外部5V的直流电源提供，把内正外负的5V电源插入JT9座，同时J0短路冒打在左边，J1短路冒打在右边，J6短路冒打在上方。

（注：5V电源用户选配）3．出厂程序为电子时钟程序，上电后自动运行电子时钟，数码管和段码LCD同时显示！II实验一 I/O端口控制实验一、实验目的1．掌握MSP430449一般IO口的应用2．掌握端口寄存器的组成和使用二、实验说明MSP430F1XX系列单片机最多有6个I/O口：P1～P6，每个端口有8个管脚。

每个管脚可以单独设置成输入或者输出方向，并且每个管脚都可以进行单独的读或者写。

P1口和P2口具有中断功能，P1口和P2口的每个管脚都可以单独设置成中断，并且可以设置成上升沿或者下降沿触发中断。

P1口的所有管脚共用一个中断向量，同样P2口的所有管脚也共用一个中断向量。

MSP430F1XX系列单片机的I/O口主要有以下特征：每个I/O口可以独立编程设置。

输入输出可以任意结合使用。

P1口和P2口的中断功能可以单独设置。

有独立的输入输出寄存器。