avr数据类型(国外英语资料).docVIP

avr数据类型(国外英语资料) 1, basic grammar introduction A simple AVR program #include iom16v.h #include macros.h Void, main () { PORTA = 0x0F; / / PA port to PA port assignment, let the low four to 1, high four to 0 While (1) ; } the function of this program is to set the value of PA port to 0x0F. 1, the program to start with the word #include statement, iom16v.h is to contain a specific header file, called pretreatment instructions, i0m16v means that the use of mega16, macros.h contains the necessary AVR operation command. 2, the C language program is made up of functions, such as the void main () above, and the previous void indicates that the function has no return value. Each C program has only one main () function, and the system starts running from main (). 3. The contents of the function are expanded with braces, {,} and}, and each statement is ended with a semicolon. If there is no content before the semicolon, there is no operation statement after the compilation. 4, the C program can add some text, line with double inclined shoulder / /, if it is a multi line, with / *, with * end, such as the / * * / note. 5, the function can have parameters, are placed in parentheses. 6, the use of C language can easily operate on the AVR device components, such as PORTA = 0x0F in the program; 7, any AVR C program must be an infinite loop, otherwise the program will run along the program storage area until the overflow program store, the program from scratch. 2, AVR C language basic characters, identifiers and keywords AVR C language is the same as the common C language. The basic characters include the Arabia numeral 0~9; the case Latin letters a ~ Z and A ~ Z; some selected printable characters, such as ~! No. @ $% ^ * = {}) (initial,.; / ? You \ ; spaces, newlines and tabs of the three kinds of whitespace to split and format function. Naming a system object is called an identifier. An identifier consists of a string of numbers, letters, underscores, and letters that are case