USB 是英文Universal Serial Bus 的縮寫(xiě)，中文含義是“通用串行總線”。它是一種應(yīng)用在PC 領(lǐng)域的新型接口技術(shù)。早在1995年，就已經(jīng)有PC 機(jī)帶有USB 接口了，但由于缺乏軟件及硬件設(shè)備的支持，這些PC 機(jī)的USB 接口都閑置未用。
上傳時(shí)間： 2013-10-20
上傳用戶(hù)：LIKE
The NCV7356 is a physical layer device for a single wire data linkcapable of operating with various Carrier Sense Multiple Accesswith Collision Resolution (CSMA/CR) protocols such as the BoschController Area Network (CAN) version 2.0. This serial data linknetwork is intended for use in applications where high data rate is notrequired and a lower data rate can achieve cost reductions in both thephysical media components and in the microprocessor and/ordedicated logic devices which use the network.The network shall be able to operate in either the normal data ratemode or a high-speed data download mode for assembly line andservice data transfer operations. The high-speed mode is onlyintended to be operational when the bus is attached to an off-boardservice node. This node shall provide temporary bus electrical loadswhich facilitate higher speed operation. Such temporary loads shouldbe removed when not performing download operations.The bit rate for normal communications is typically 33 kbit/s, forhigh-speed transmissions like described above a typical bit rate of83 kbit/s is recommended. The NCV7356 features undervoltagelockout, timeout for faulty blocked input signals, output blankingtime in case of bus ringing and a very low sleep mode current.
上傳時(shí)間： 2013-10-24
上傳用戶(hù)：s藍(lán)莓汁
The LPC2292/2294 microcontrollers are based on a 16/32-bit ARM7TDMI-S CPU with real-time emulation and embedded trace support, together with 256 kB of embedded high-speed flash memory. A 128-bit wide memory interface and a unique accelerator architecture enable 32-bit code execution at the maximum clock rate. For critical code size applications, the alternative 16-bit Thumb mode reduces code by more than 30 pct with minimal performance penalty. With their 144-pin package, low power consumption, various 32-bit timers, 8-channel 10-bit ADC, 2/4 (LPC2294) advanced CAN channels, PWM channels and up to nine external interrupt pins these microcontrollers are particularly suitable for automotive and industrial control applications as well as medical systems and fault-tolerant maintenance buses. The number of available fast GPIOs ranges from 76 (with external memory) through 112 (single-chip). With a wide range of additional serial communications interfaces, they are also suited for communication gateways and protocol converters as well as many other general-purpose applications. Remark: Throughout the data sheet, the term LPC2292/2294 will apply to devices with and without the /00 or /01 suffix. The suffixes /00 and /01 will be used to differentiate from other devices only when necessary.
標(biāo)簽： lpc datasheet 2292 2294
上傳時(shí)間： 2014-12-30
上傳用戶(hù)：aysyzxzm
The NXP LPC314x combine a 270 MHz ARM926EJ-S CPU core, High-speed USB 2.0OTG, 192 KB SRAM, NAND flash controller, flexible external bus interface, three channel10-bit A/D, and a myriad of serial and parallel interfaces in a single chip targeted atconsumer, industrial, medical, and communication markets. To optimize system powerconsumption, the LPC314x have multiple power domains and a very flexible ClockGeneration Unit (CGU) that provides dynamic clock gating and scaling.
上傳時(shí)間： 2013-10-11
上傳用戶(hù)：yuchunhai1990
The LPC4350/30/20/10 are ARM Cortex-M4 based microcontrollers for embeddedapplications. The ARM Cortex-M4 is a next generation core that offers systemenhancements such as low power consumption, enhanced debug features, and a highlevel of support block integration.The LPC4350/30/20/10 operate at CPU frequencies of up to 150 MHz. The ARMCortex-M4 CPU incorporates a 3-stage pipeline, uses a Harvard architecture withseparate local instruction and data buses as well as a third bus for peripherals, andincludes an internal prefetch unit that supports speculative branching. The ARMCortex-M4 supports single-cycle digital signal processing and SIMD instructions. Ahardware floating-point processor is integrated in the core.The LPC4350/30/20/10 include an ARM Cortex-M0 coprocessor, up to 264 kB of datamemory, advanced configurable peripherals such as the State Configurable Timer (SCT)and the Serial General Purpose I/O (SGPIO) interface, two High-speed USB controllers,Ethernet, LCD, an external memory controller, and multiple digital and analog peripherals
上傳時(shí)間： 2013-10-28
上傳用戶(hù)：15501536189
On the LPC13xx, programming, erasure and re-programming of the on-chip flash can be performed using In-System Programming (ISP) via the UART serial port, and also, can be performed using In-Application Programming (IAP) calls directed by the end-user code. For In-System Programming (ISP) via the UART serial port, the ISP command handler (resides in the bootloader) allows erasure of one or more sector (s) of the on-chip flash memory.
標(biāo)簽： 1300 LPC 勘誤 數(shù)據(jù)手冊(cè)
上傳時(shí)間： 2013-12-13
上傳用戶(hù)：lmq0059
The NXP LPC315x combine an 180 MHz ARM926EJ-S CPU core, High-speed USB 2.0OTG, 192 KB SRAM, NAND flash controller, flexible external bus interface, an integratedaudio codec, Li-ion charger, Real-Time Clock (RTC), and a myriad of serial and parallelinterfaces in a single chip targeted at consumer, industrial, medical, and communicationmarkets. To optimize system power consumption, the LPC315x have multiple powerdomains and a very flexible Clock Generation Unit (CGU) that provides dynamic clockgating and scaling.The LPC315x is implemented as multi-chip module with two side-by-side dies, one fordigital fuctions and one for analog functions, which include a Power Supply Unit (PSU),audio codec, RTC, and Li-ion battery charger.
上傳時(shí)間： 2014-01-17
上傳用戶(hù)：Altman
MAXQUSBJTAGOW評(píng)估板軟件:關(guān)鍵特性 Easily Load and Debug Code Interface Provides In-Application Debugging Features Step-by-Step Execution Tracing Breakpointing by Code Address, Data Memory Address, or Register Access Data Memory View and Edit Supports Logic Levels from 1.1V to 3.6V Supports JTAG and 1-Wire Protocols Each Adapter Has Its Own Unique Serial ID, Allowing Multiple Adapters to be Connected Without COM Port Conflicts Has In-Field Upgradable Capability if Firmware Needs to be Upgraded Enclosure Protects from Shorts and ESD
標(biāo)簽： MAXQUSBJTAGOW 評(píng)估板 軟件
上傳時(shí)間： 2013-10-24
上傳用戶(hù)：teddysha
用途：測(cè)量地磁方向，測(cè)量物體靜止時(shí)候的方向，測(cè)量傳感器周?chē)帕€的方向。注意，測(cè)量地磁時(shí)候容易受到周?chē)艌?chǎng)影響，主芯片HMC5883 三軸磁阻傳感器特點(diǎn)（抄自網(wǎng)上）： 1，數(shù)字量輸出：I2C 數(shù)字量輸出接口，設(shè)計(jì)使用非常方便。 2，尺寸小: 3x3x0.9mm LCC 封裝，適合大規(guī)模量產(chǎn)使用。 3，精度高：1－2 度，內(nèi)置12 位A/D,OFFSET, SET/RESET 電路，不會(huì)出現(xiàn)磁飽和現(xiàn)象，不會(huì)有累加誤差。 4，支持自動(dòng)校準(zhǔn)程序，簡(jiǎn)化使用步驟，終端產(chǎn)品使用非常方便。 5，內(nèi)置自測(cè)試電路，方便量產(chǎn)測(cè)試，無(wú)需增加額外昂貴的測(cè)試設(shè)備。 6，功耗低：供電電壓1.8V, 功耗睡眠模式-2.5uA 測(cè)量模式-0.6mA 連接方法： 只要連接VCC，GND，SDA，SDL 四條線。 Arduino GND -> HMC5883L GND Arduino 3.3V -> HMC5883L VCC Arduino A4 (SDA) -> HMC5883L SDA Arduino A5 (SCL) -> HMC5883L SCL (注意，接線是A4，A5，不是D4,D5) 源程序： #include <Wire.h> #include <HMC5883L.h> HMC5883Lcompass; voidsetup() { Serial.begin(9600); Wire.begin(); compass = HMC5883L(); compass.SetScale(1.3); compass.SetMeasurementMode(Measurement_Continuous); } voidloop() { MagnetometerRaw raw = compass.ReadRawAxis(); MagnetometerScaled scaled = compass.ReadScaledAxis(); float xHeading = atan2(scaled.YAxis, scaled.XAxis); float yHeading = atan2(scaled.ZAxis, scaled.XAxis); float zHeading = atan2(scaled.ZAxis, scaled.YAxis); if(xHeading < 0) xHeading += 2*PI; if(xHeading > 2*PI) xHeading -= 2*PI; if(yHeading < 0) yHeading += 2*PI; if(yHeading > 2*PI) yHeading -= 2*PI; if(zHeading < 0) zHeading += 2*PI; if(zHeading > 2*PI) zHeading -= 2*PI; float xDegrees = xHeading * 180/M_PI; float yDegrees = yHeading * 180/M_PI; float zDegrees = zHeading * 180/M_PI; Serial.print(xDegrees); Serial.print(","); Serial.print(yDegrees); Serial.print(","); Serial.print(zDegrees); Serial.println(";"); delay(100); }
標(biāo)簽： Arduino 5883L 5883 HMC
上傳時(shí)間： 2013-12-16
上傳用戶(hù)：stella2015
超聲波傳感器適用于對(duì)大幅的平面進(jìn)行靜止測(cè)距。普通的超聲波傳感器測(cè)距范圍大概是 2cm~450cm，分辨率3mm（淘寶賣(mài)家說(shuō)的，筆者測(cè)試環(huán)境沒(méi)那么好，個(gè)人實(shí)測(cè)比較穩(wěn)定的 距離10cm~2m 左右，超過(guò)此距離就經(jīng)常有偶然不準(zhǔn)確的情況發(fā)生了，當(dāng)然不排除筆者技術(shù) 問(wèn)題。） 測(cè)試對(duì)象是淘寶上面最便宜的SRF-04 超聲波傳感器，有四個(gè)腳：5v 電源腳（Vcc），觸發(fā)控制端（Trig），接收端（Echo），地端（GND） 附:SRF 系列超聲波傳感器參數(shù)比較 模塊工作原理： 采用IO 觸發(fā)測(cè)距，給至少10us 的高電平信號(hào)； 模塊自動(dòng)發(fā)送8個(gè)40KHz 的方波，自動(dòng)檢測(cè)是否有信號(hào)返回； 有信號(hào)返回，通過(guò)IO 輸出一高電平，高電平持續(xù)的時(shí)間就是超聲波從發(fā)射到返回的時(shí)間．測(cè)試距離=(高電平時(shí)間*聲速(340m/s))/2; 電路連接方法 Arduino 程序例子： constintTrigPin = 2; constintEchoPin = 3; floatcm; voidsetup() { Serial.begin(9600); pinMode(TrigPin, OUTPUT); pinMode(EchoPin, INPUT); } voidloop() { digitalWrite(TrigPin, LOW); //低高低電平發(fā)一個(gè)短時(shí)間脈沖去TrigPin delayMicroseconds(2); digitalWrite(TrigPin, HIGH); delayMicroseconds(10); digitalWrite(TrigPin, LOW); cm = pulseIn(EchoPin, HIGH) / 58.0; //將回波時(shí)間換算成cm cm = (int(cm * 100.0)) / 100.0; //保留兩位小數(shù) Serial.print(cm); Serial.print("cm"); Serial.println(); delay(1000); }
上傳時(shí)間： 2013-10-18
上傳用戶(hù)：星仔
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