c programming open serial port

Ngày tải lên: 05/08/2014, 09:46

... 2003 Abstract While devices that use RS−232 and the serial port to communicate are becoming increasingly rare, it is still an important skill to have. Serial port programming, at its most basic level, consists ... serial port, or by changing the per- missions of the program to allow access to the serial port. Code to open the serial port under Linux can is as follows. int fd = open( //the name of the serial ... to be changed //CREAD says to enable the receiver options .c_ cflag |= (CLOCAL | CREAD); //apply the settings to the serial port //TCSNOW means apply the changes now //other valid options include: //...

Ngày tải lên: 05/11/2013, 20:15

... used in comparisons with other characters. Certain characters can be represented in character and string constants by escape sequences like \n (newline); these sequences look like two characters, ... the other is specifically called for. For instance, consider the function squeeze(s ,c) , which removes all occurrences of the character c from the string s. /* squeeze: delete all c from s */ ... A character constant is an integer, written as one character within single quotes, such as 'x'. The value of a character constant is the numeric value of the character in the machine's character...

Ngày tải lên: 16/08/2012, 11:09

... • Mỗi c u lệnh viết trên một dòng. C c câu lệnh c ng c p viết trên c ng một c t, c c câu lệnh c c p nhỏ hơn viết thụt vào trong, c ch lệnh c p trên bằng một khoảng Tab ... project : chọn menu Project/Close Project. 2. Một số nguyên t c khi kết nối dữ liệu trong Project. • C c tập tin .H thường dùng để khai báo c c biến dữ liệu và hàm dùng chung (export data). C c ... hiện c a chúng chỉ khai báo một lần duy nhất trong tập tin .CPP tương ứng. • Tập tin project thường chứa c c tập tin c i đặt .CPP, thư viện đối tượng .OBJ, … • C c tập tin trong c ng một project...

Ngày tải lên: 22/08/2012, 09:26

... Bottom; }RECT; 2. C ch trình bày • Đầu mỗi chương trình hay tập tin đều c một số dòng mô tả. C c thông tin thường đề c p trong phần này thường là : tên tập tin, tóm tắt m c đích c a chương trình, ... lpEvent là biến kiểu con trỏ • Tên hàm : thường bắt đầu bằng một động từ. Thứ tự c c tham số trong hàm đư c qui ư c theo thứ tự : c c dữ liệu trả về, c c dữ liệu vào, … • Ví dụ : void CopyArray(int ... để thuận tiện cho vi c theo dõi chương trình, người ta thường thêm trư c tên biến một số kí tự viết thường để chỉ kiểu dữ liệu c a biến đó. C c kí tự thường đư c dùng trong qui ư c này thường...

Ngày tải lên: 05/09/2012, 15:09

... in comparisons with other characters. Certain characters can be represented in character and string constants by escape sequences like \n (newline); these sequences look like two characters, ... A character constant is an integer, written as one character within single quotes, such as 'x'. The value of a character constant is the numeric value of the character in the machine's ... delimit it. The same escape sequences used in character constants apply in strings; \" represents the double-quote character. String constants can be concatenated at compile time: "hello,...

Ngày tải lên: 14/11/2012, 17:10

... of objects absorb characteristics from existing classes –Objects • Encapsulate data and functions • Information hiding – Communicate across well-defined interfaces  2003 Prentice Hall, Inc. All ... cout instead of std::cout  2003 Prentice Hall, Inc. All rights reserved. 4 C+ + Standard Library C+ + programs – Built from pieces called classes and functions • C+ + standard library – Rich collections ... Prentice Hall, Inc. All rights reserved. 25 Introduction to Object Technology • User-defined types (classes, components) – Data members • Data components of class – Member functions • Function components...

Ngày tải lên: 25/04/2013, 19:12

Ngày tải lên: 13/09/2013, 09:23

... c = getchar(); the variable c contains the next character of input. The characters normally come from the keyboard; input from files is discussed in Chapter 7. The function putchar ... function putchar prints a character each time it is called: putchar (c) ; prints the contents of the integer variable c as a character, usually on the screen. Calls to putchar and printf may ... automatic henceforth to refer to these local variables. ( Chapter 4 discusses the static storage class, in which local variables do retain their values between calls.) Because automatic variables...

Ngày tải lên: 20/10/2013, 17:15

Ngày tải lên: 29/10/2013, 00:48

... Some popular latch ICs. Name Description 74HCT373 Octal D-type latch 74HCT573 Octal D-type latch Page 24 Counters Counters, as the name suggests, count. The counter has a clock input pin, a reset ... popular counter ICs. Name Description 74LS90 Decade counter 74HCT4024 Six-stage binary counter 74HCT4040 12-Stage binary counter 74HCT190 Synchronous decade up/down counters with mode control 74HCT191 ... The choice of a communication link also depends on the digital circuit, so the question becomes a sort of a chicken and egg problem. Options for the digital circuit include: • The digital circuit...

Ngày tải lên: 04/11/2013, 18:15

... Framework class library can use the SerialPort class to access COM ports. Some USB devices function as virtual COM ports, which applications can access in the same way as physical serial ports. ... system’s CPU. Any PC with a free expansion slot can add this type of port on an expansion card. • RS-232 ports on PC Cards (also called PCMCIA cards). Any PC with a free PC-Card slot can use these. • ... networks. On PCs, ports that applications can access as COM ports include these: • RS-232 ports on older motherboards or on expansion cards. • Ports that connect to a PC via a USB converter that...

Ngày tải lên: 06/11/2013, 08:15

... Turbo C+ + under MS-DOS Borland International makes a low-cost MS-DOS C+ + compiler called Turbo C+ +. This compiler will compile both C and C+ + code. We will describe only how to compile C code. ... their offerings is a C compiler called gcc. To compile a program using the gcc compiler use the following command line: % gcc -g -Wall -ohello hello .c The additional switch -Wall turns on the ... is: C: > bcc -ml -v -N -P -w -ehello hello .c The command-line options are the same for both Turbo C+ + and Borland C+ +. 2.3.3.5 Microsoft Visual C+ + Microsoft Visual C+ + is another C+ + /C compiler...

Ngày tải lên: 12/12/2013, 22:15

... Foundation's gcc compiler. For MS-DOS/Windows users, instructions are included for Borland C+ +, Turbo C+ +, and Microsoft Visual C+ +. (These compilers compile both C and C+ + code.) The book ... and Functions Scope and Class Functions Functions with No Parameters Structured Programming Recursion Answers Programming Exercises 10. C Preprocessor #define Statement Conditional ... to anyone who can send electronic mail to, and receive electronic mail from, Internet sites. Any company or service provider that allows email connections to the Internet can access FTPMAIL....

Ngày tải lên: 12/12/2013, 22:15

... source system for Excel-based reports, customizing activities include:  Creation of meta data  Creation/maintenance of a self-defined OIW information catalog < In Excel, reports can ... example, fonts, columns, graphics, etc.) available in Microsoft Excel. The OIW reports in Excel can be maintained with all the functions of Excel, Microsoft Office, and Visual Basic. The OIW Frontend ... Reporting Made Easy C 4 OIW Frontend for Microsoft Excel The OIW contains a programming interface to help users connect to external applications. The OIW Frontend for Microsoft Excel...

Ngày tải lên: 21/12/2013, 19:15

... called port D, which is used for serial port programming. • The Microchip PIC1 6C7 4 has five ports: PORTA through PORTE. Each port has an associated TRIS register that controls the data direction. ... instructions to the COPCR register. Interestingly, the COP watchdog is dependent upon the system clock; a clock monitor circuit resets the MCU if the clock stops, and thereby renders the COP watchdog ... manoeuvre. Programming the prescalar and starting the clock are tasks of the software developer. Knowing the processor clock frequency, and choosing correct prescalar values, you can achieve accurate...

Ngày tải lên: 22/12/2013, 02:17

Ngày tải lên: 20/01/2014, 19:20