2. 第二節(jié) 幾類重要庫函數(shù)
1. 1. 專用寄存器include文件
例如8031、8051均為REG51.h其中包括了所有8051的SFR及其位ㄒ�，以掗伒统都眳Q氚ū疚募?br>2. 2. 絕對地址include文件absacc.h
該文件中實際只定義了幾個宏,以確定各存儲空間的絕對地址。
3. 3. 動態(tài)內(nèi)存分配函數(shù),位于stdlib.h中
4. 4. 緩沖區(qū)處理函數(shù)位于“string.h”中
其中包括拷貝比較移動等函數(shù)如：
memccpy memchr memcmp memcpy memmove memset
這樣很方便地對緩沖區(qū)進行處理。
5. 5. 輸入輸出流函數(shù),位于“stdio.h”中
流函數(shù)通8051的串口或用戶定義的I/O口讀寫數(shù)據(jù),缺省為8051串口,如要修改,比如改為LCD顯示,可修改lib目錄中的getkey.c及putchar.c源文件,然后在庫中替換它們即可。
3. 第三節(jié) Keil C51庫函數(shù)原型列表
1. 1. CTYPE.H
bit isalnum(char c);
bit isalpha(char c);
bit iscntrl(char c);
bit isdigit(char c);
bit isgraph(char c);
bit islower(char c);
bit isprint(char c);
bit ispunct(char c);
bit isspace(char c);
bit isupper(char c);
bit isxdigit(char c);
bit toascii(char c);
bit toint(char c);
char tolower(char c);
char __tolower(char c);
char toupper(char c);
char __toupper(char c);
2. 2. INTRINS.H
unsigned char _crol_(unsigned char c,unsigned char b);
unsigned char _cror_(unsigned char c,unsigned char b);
unsigned char _chkfloat_(float ual);
unsigned int _irol_(unsigned int i,unsigned char b);
unsigned int _iror_(unsigned int i,unsigned char b);
unsigned long _irol_(unsigned long l,unsigned char b);
unsigned long _iror_(unsigned long L,unsigned char b);
void _nop_(void);
bit _testbit_(bit b);
3. 3. STDIO.H
char getchar(void);
char _getkey(void);
char *gets(char * string,int len);
int printf(const char * fmtstr[,argument]…);
char putchar(char c);
int puts (const char * string);
int scanf(const char * fmtstr.[,argument]…);
int sprintf(char * buffer,const char *fmtstr[;argument]);
int sscanf(char *buffer,const char * fmtstr[,argument]);
char ungetchar(char c);
void vprintf (const char *fmtstr,char * argptr);
void vsprintf(char *buffer,const char * fmtstr,char * argptr);
4. 4. STDLIB.H
float atof(void * string);
int atoi(void * string);
long atol(void * string);
void * calloc(unsigned int num,unsigned int len);
void free(void xdata *p);
void init_mempool(void *data *p,unsigned int size);
void *malloc (unsigned int size);
int rand(void);
void *realloc (void xdata *p,unsigned int size);
void srand (int seed);
5. 5. STRING.H
void *memccpy (void *dest,void *src,char c,int len);
void *memchr (void *buf,char c,int len);
char memcmp(void *buf1,void *buf2,int len);
void *memcopy (void *dest,void *SRC,int len);
void *memmove (void *dest,void *src,int len);
void *memset (void *buf,char c,int len);
char *strcat (char *dest,char *src);
char *strchr (const char *string,char c);
char strcmp (char *string1,char *string2);
char *strcpy (char *dest,char *src);
int strcspn(char *src,char * set);
int strlen (char *src);
char *strncat (char 8dest,char *src,int len);
char strncmp(char *string1,char *string2,int len);
char strncpy (char *dest,char *src,int len);
char *strpbrk (char *string,char *set); |
66821730(技術(shù)支持)
