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BOARD-specific

  • 基于ISA總線與KH-9300的數(shù)據(jù)采集系統(tǒng)

    介紹基于ISA總線與KH-9300的數(shù)據(jù)采集板卡的設置,詳細說明8254定時計數(shù)器及8259中斷控制器的結構特點、工作方式、控制字等,探討中斷類型、中斷處理程序、中斷矢量表及其填寫。重點講述使用TorboC編寫中斷服務程序的方法,應注意的主要問題及程序測試的結果。 Abstract:  The settings of KH-9300 data acquisition board based on the ISA bus is introduced,the structural characteristics,working methods,control characters of the timing counter 8254 and interruptioncontroller 8259 are explained in detail.The interruption type,interrupt handling programs,interruption vector table and its filling also are discussed.Further,great emphasis is put on the method of interrupt service program compiled by Torbo C,the main issues that should be noted,and the results of program testing.

    標簽: 9300 ISA KH 總線

    上傳時間: 2013-11-14

    上傳用戶:qq527891923

  • 基于PIC16C711的脈沖點火控制器設計

     針對目前燃氣灶市場的狀況,提出一種基于PIC16C711單片機的燃氣灶脈沖點火控制器設計,具體包括有系統(tǒng)的組成和功能介紹、硬件電路設計及軟件功能實現(xiàn)。 Abstract:  Aiming at today’s gas cooker market, a pulse ignition controler design based on PIC16C711 is presented.The specific descriptions of system components and functions,hardware circuit design and software function are given.

    標簽: C711 PIC 16C 711

    上傳時間: 2013-10-31

    上傳用戶:zhqzal1014

  • 基于C8051F005單片機的參數(shù)測試儀的設計

    介紹了基于單片機航空交流電參數(shù)測試儀的系統(tǒng)設計。以Silicon Labs公司的C8051F005單片機為核心設計出數(shù)據(jù)采集板,通過RS-232串口與上位機通訊。運用Lab Windows/CVI編寫的上位機軟件實現(xiàn)信號的檢測以及波形和數(shù)據(jù)的顯示,給出了測試儀硬件電路的組成和軟件流程圖。本系統(tǒng)具有硬件結構簡單、容易實現(xiàn)和成本低等特點,在實際應用中其穩(wěn)定性、精確性均能滿足客戶要求。 Abstract:  The design of aeronautics AC parameters tester based on the single-chip is introduced.The core component of data acquisition board is C8051F005 single chip of Silicon Labs Company,and communication with PC through RS-232. The signal processing software programmed with LabWindows/CVI can be used successfully to fulfill inspection of signal and display of the waveform and data. The hardware and software configuration of test instrument are provided.The hardware of the system is simple, and can be easily realized.The stability and precision of the measurement instrument are enough to meet the requirements.

    標簽: C8051F005 單片機 儀的設計 參數(shù)測試

    上傳時間: 2013-11-18

    上傳用戶:wang5829

  • FET430PIF自制資料

    The MSP-FET430PIF is a Parallel Port interface (does not include target board) that is used to program and debug MSP430 FET tools and test boards through the JTAG interface. This interface is included in our FET tools, but sold without the development board. This interface uses a Parallel PC Port to communicate to the Debugger Software (IAR Kickstart software included) running on the PC. The interface uses the standard 14 pin header to communicate to the MSP430 device using the standard JTAG protocol. The flash memory can be erased and programmed in seconds with only a few keystrokes, and since the MSP430 flash is extremely low power, no external power supply is required. The tool has an integrated software environment and connects directly to the PC which greatly simplifies the set-up and use of the tool. The flash development tool supports development with all MSP430 flash parts. Features MSP430 debugging interface to connect a MSP430-Flash-device to a Parallel port on a PC Supports JTAG debug protocol (NO support for Spy-Bi-Wire (2-wire JTAG) debug protocol, Spy-Bi-Wire (2-wire JTAG) is supported by MSP-FET430UIF) Parallel Port cable and a 14-conductor target cable Full documentation on CD ROM Integrated IAR Kickstart user interface which includes: Assembler Linker Limulator Source-level debugger Limited C-compiler Technical specifications: Backwardly compatable with existing FET tool boards.

    標簽: FET 430 PIF

    上傳時間: 2013-10-26

    上傳用戶:fengweihao158@163.com

  • PICKIT™ 2 PROGRAMMER-TO-

    PICKIT™ 2 PROGRAMMER-TO-GO USER GUIDE The PICkit 2 Programmer-To-Go functionality allows a PIC MCU memory image to be downloaded into the PICkit 2 unit for later programming into a specific PIC MCU. No software or PC is required to program devices once the PICkit 2 unit is set up for Programming-To-Go. A USB power source for the PICkit 2 is all that is needed.

    標簽: PROGRAMMER-TO PICKIT 8482

    上傳時間: 2013-10-29

    上傳用戶:ca05991270

  • HT45R35在觸控按鍵中的應用(使用C語言)

    HT45R35在觸控按鍵中的應用(使用C語言) HT45R35 Demo Board包含12個Touch Switch,這是一種電容式的非接觸式觸摸按鍵,它可以用來取代任何的機械式按鍵。由于C語言具有良好的可讀性、可移植性等優(yōu)點,本文將介紹如何使用Holtek C語言來完成HT45R35 12Key Touch Switch Demo Board的軟件設計.

    標簽: 45R R35 HT 45

    上傳時間: 2013-10-10

    上傳用戶:bjgaofei

  • HT45R34在12KEY觸摸按鍵中的應用(使用C語言)

    HT45R34在12KEY觸摸按鍵中的應用(使用C語言) 本文中我們介紹如何利用我們Holtek C語言來完成HT45R34 12Key Touch Switch Demo board的軟件設計。

    標簽: 45R R34 KEY HT

    上傳時間: 2013-12-22

    上傳用戶:han_zh

  • 用戶程序示例教程

    用戶程序示例教程 The Blinky project is a simple program for the LPC2138using Keil MCB2130 Microcontroller Board. It blinks the LEDs at speed according to the Potentiometer setting and prints the current seting to the Serial Port 1.In addition it generates a sine wave with an adjustable frequency on the speaker of the board.

    標簽: 用戶 教程 程序

    上傳時間: 2014-12-27

    上傳用戶:hongmo

  • Designing Boards with Atmel AT

    Designing Boards with Atmel AT89C51, AT89C52, AT89C1051, and AT89C2051 for Writing Flash at In-Circuit Test:Recent improvements in chips andtesters have made it possible for thetester to begin taking over the role traditionallyassigned to the PROM programmer.Instead of having a PROM programmerwrite nonvolatile memoriesbefore assembling the board, the in-circuittester writes them during in-circuittesting operations. Many Teradyne Z18-series testers are now in use loadingcode into nonvolatile memories, microcontrollersand in-circuit programmable logic devices. The purpose of this note is to explain how the Z18 approaches the writing task for Atmel AT89C series IC’s,so that designers of boards using these chips can get the best results.

    標簽: Designing Boards Atmel with

    上傳時間: 2013-11-20

    上傳用戶:lijianyu172

  • PC機之間串口通信的實現(xiàn)

    PC機之間串口通信的實現(xiàn)一、實驗目的 1.熟悉微機接口實驗裝置的結構和使用方法。 2.掌握通信接口芯片8251和8250的功能和使用方法。 3.學會串行通信程序的編制方法。 二、實驗內容與要求 1.基本要求主機接收開關量輸入的數(shù)據(jù)(二進制或十六進制),從鍵盤上按“傳輸”鍵(可自行定義),就將該數(shù)據(jù)通過8251A傳輸出去。終端接收后在顯示器上顯示數(shù)據(jù)。具體操作說明如下:(1)出現(xiàn)提示信息“start with R in the board!”,通過調整乒乓開關的狀態(tài),設置8位數(shù)據(jù);(2)在小鍵盤上按“R”鍵,系統(tǒng)將此時乒乓開關的狀態(tài)讀入計算機I中,并顯示出來,同時顯示經(jīng)串行通訊后,計算機II接收到的數(shù)據(jù);(3)完成后,系統(tǒng)提示“do you want to send another data? Y/N”,根據(jù)用戶需要,在鍵盤按下“Y”鍵,則重復步驟(1),進行另一數(shù)據(jù)的通訊;在鍵盤按除“Y”鍵外的任意鍵,將退出本程序。2.提高要求 能夠進行出錯處理,例如采用奇偶校驗,出錯重傳或者采用接收方回傳和發(fā)送方確認來保證發(fā)送和接收正確。 三、設計報告要求 1.設計目的和內容 2.總體設計 3.硬件設計:原理圖(接線圖)及簡要說明 4.軟件設計框圖及程序清單5.設計結果和體會(包括遇到的問題及解決的方法) 四、8251A通用串行輸入/輸出接口芯片由于CPU與接口之間按并行方式傳輸,接口與外設之間按串行方式傳輸,因此,在串行接口中,必須要有“接收移位寄存器”(串→并)和“發(fā)送移位寄存器”(并→串)。能夠完成上述“串←→并”轉換功能的電路,通常稱為“通用異步收發(fā)器”(UART:Universal Asynchronous Receiver and Transmitter),典型的芯片有:Intel 8250/8251。8251A異步工作方式:如果8251A編程為異步方式,在需要發(fā)送字符時,必須首先設置TXEN和CTS#為有效狀態(tài),TXEN(Transmitter Enable)是允許發(fā)送信號,是命令寄存器中的一位;CTS#(Clear To Send)是由外設發(fā)來的對CPU請求發(fā)送信號的響應信號。然后就開始發(fā)送過程。在發(fā)送時,每當CPU送往發(fā)送緩沖器一個字符,發(fā)送器自動為這個字符加上1個起始位,并且按照編程要求加上奇/偶校驗位以及1個、1.5個或者2個停止位。串行數(shù)據(jù)以起始位開始,接著是最低有效數(shù)據(jù)位,最高有效位的后面是奇/偶校驗位,然后是停止位。按位發(fā)送的數(shù)據(jù)是以發(fā)送時鐘TXC的下降沿同步的,也就是說這些數(shù)據(jù)總是在發(fā)送時鐘TXC的下降沿從8251A發(fā)出。數(shù)據(jù)傳輸?shù)牟ㄌ芈嗜Q于編程時指定的波特率因子,為發(fā)送器時鐘頻率的1、1/16或1/64。當波特率指定為16時,數(shù)據(jù)傳輸?shù)牟ㄌ芈示褪前l(fā)送器時鐘頻率的1/16。CPU通過數(shù)據(jù)總線將數(shù)據(jù)送到8251A的數(shù)據(jù)輸出緩沖寄存器以后,再傳輸?shù)桨l(fā)送緩沖器,經(jīng)移位寄存器移位,將并行數(shù)據(jù)變?yōu)榇袛?shù)據(jù),從TxD端送往外部設備。在8251A接收字符時,命令寄存器的接收允許位RxE(Receiver Enable)必須為1。8251A通過檢測RxD引腳上的低電平來準備接收字符,在沒有字符傳送時RxD端為高電平。8251A不斷地檢測RxD引腳,從RxD端上檢測到低電平以后,便認為是串行數(shù)據(jù)的起始位,并且啟動接收控制電路中的一個計數(shù)器來進行計數(shù),計數(shù)器的頻率等于接收器時鐘頻率。計數(shù)器是作為接收器采樣定時,當計數(shù)到相當于半個數(shù)位的傳輸時間時再次對RxD端進行采樣,如果仍為低電平,則確認該數(shù)位是一個有效的起始位。若傳輸一個字符需要16個時鐘,那么就是要在計數(shù)8個時鐘后采樣到低電平。之后,8251A每隔一個數(shù)位的傳輸時間對RxD端采樣一次,依次確定串行數(shù)據(jù)位的值。串行數(shù)據(jù)位順序進入接收移位寄存器,通過校驗并除去停止位,變成并行數(shù)據(jù)以后通過內部數(shù)據(jù)總線送入接收緩沖器,此時發(fā)出有效狀態(tài)的RxRDY信號通知CPU,通知CPU8251A已經(jīng)收到一個有效的數(shù)據(jù)。一個字符對應的數(shù)據(jù)可以是5~8位。如果一個字符對應的數(shù)據(jù)不到8位,8251A會在移位轉換成并行數(shù)據(jù)的時候,自動把他們的高位補成0。 五、系統(tǒng)總體設計方案根據(jù)系統(tǒng)設計的要求,對系統(tǒng)設計的總體方案進行論證分析如下:1.獲取8位開關量可使用實驗臺上的8255A可編程并行接口芯片,因為只要獲取8位數(shù)據(jù)量,只需使用基本輸入和8位數(shù)據(jù)線,所以將8255A工作在方式0,PA0-PA7接實驗臺上的8位開關量。2.當使用串口進行數(shù)據(jù)傳送時,雖然同步通信速度遠遠高于異步通信,可達500kbit/s,但由于其需要有一個時鐘來實現(xiàn)發(fā)送端和接收端之間的同步,硬件電路復雜,通常計算機之間的通信只采用異步通信。3.由于8251A本身沒有時鐘,需要外部提供,所以本設計中使用實驗臺上的8253芯片的計數(shù)器2來實現(xiàn)。4:顯示和鍵盤輸入均使用DOS功能調用來實現(xiàn)。設計思路框圖,如下圖所示: 六、硬件設計硬件電路主要分為8位開關量數(shù)據(jù)獲取電路,串行通信數(shù)據(jù)發(fā)送電路,串行通信數(shù)據(jù)接收電路三個部分。1.8位開關量數(shù)據(jù)獲取電路該電路主要是利用8255并行接口讀取8位乒乓開關的數(shù)據(jù)。此次設計在獲取8位開關數(shù)據(jù)量時采用8255令其工作在方式0,A口輸入8位數(shù)據(jù),CS#接實驗臺上CS1口,對應端口為280H-283H,PA0-PA7接8個開關。2.串行通信電路串行通信電路本設計中8253主要為8251充當頻率發(fā)生器,接線如下圖所示。

    標簽: PC機 串口通信

    上傳時間: 2013-12-19

    上傳用戶:小火車啦啦啦

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