IIC总线，读取开发板上的温湿度传感器

#include <stdarg.h> #include <ctype.h> #include "uart.h" #define size_t unsigned int unsigned long simple_strtoul(const char *cp,char **endp,unsigned int base) { unsigned long result = 0,value; if (*cp == '0') { cp++; if ((*cp == 'x') && isxdigit(cp[1])) { base = 16; cp++; } if (!base) { base = 8; } } if (!base) { base = 10; } while (isxdigit(*cp) && (value = isdigit(*cp) ? *cp-'0' : (islower(*cp) ? toupper(*cp) : *cp)-'A'+10) < base) { result = result*base + value; cp++; } if (endp) *endp = (char *)cp; return result; } long simple_strtol(const char *cp,char **endp,unsigned int base) { if(*cp=='-') return -simple_strtoul(cp+1,endp,base); return simple_strtoul(cp,endp,base); } #ifdef CFG_64BIT_STRTOUL unsigned long long simple_strtoull (const char *cp, char **endp, unsigned int base) { unsigned long long result = 0, value; if (*cp == '0') { cp++; if ((*cp == 'x') && isxdigit (cp[1])) { base = 16; cp++; } if (!base) { base = 8; } } if (!base) { base = 10; } while (isxdigit (*cp) && (value = isdigit (*cp) ? *cp - '0' : (islower (*cp) ? toupper (*cp) : *cp) - 'A' + 10) < base) { result = result * base + value; cp++; } if (endp) *endp = (char *) cp; return result; } #endif /* CFG_64BIT_STRTOUL */ /* we use this so that we can do without the ctype library */ #define is_digit(c) ((c) >= '0' && (c) <= '9') static int skip_atoi(const char **s) { int i=0; while (is_digit(**s)) i = i*10 + *((*s)++) - '0'; return i; } #define ZEROPAD 1 /* pad with zero */ #define SIGN 2 /* unsigned/signed long */ #define PLUS 4 /* show plus */ #define SPACE 8 /* space if plus */ #define LEFT 16 /* left justified */ #define SPECIAL 32 /* 0x */ #define LARGE 64 /* use 'ABCDEF' instead of 'abcdef' */ #ifdef CFG_64BIT_VSPRINTF #define do_div(n,base) ({ \ unsigned int __res; \ __res = ((unsigned long long) n) % base; \ n = ((unsigned long long) n) / base; \ __res; \ }) #else #define do_div(n,base) ({ \ int __res; \ __res = ((unsigned long) n) % base; \ n = ((unsigned long) n) / base; \ __res; \ }) #endif //__res = ((unsigned long) n) % base; #ifdef CFG_64BIT_VSPRINTF static char * number(char * str, long long num, unsigned int base, int size, int precision ,int type) #else static char * number(char * str, long num, unsigned int base, int size, int precision ,int type) #endif { char c,sign,tmp[66]; const char *digits="0123456789abcdefghijklmnopqrstuvwxyz"; int i; if (type & LARGE) digits = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"; if (type & LEFT) type &= ~ZEROPAD; if (base < 2 || base > 36) return 0; c = (type & ZEROPAD) ? '0' : ' '; sign = 0; if (type & SIGN) { if (num < 0) { sign = '-'; num = -num; size--; } else if (type & PLUS) { sign = '+'; size--; } else if (type & SPACE) { sign = ' '; size--; } } if (type & SPECIAL) { if (base == 16) size -= 2; else if (base == 8) size--; } i = 0; if (num == 0) tmp[i++]='0'; else while (num != 0) if (i > precision) tmp[i++] = digits[do_div(num,base)]; precision = i; size -= precision; if (!(type&(ZEROPAD+LEFT))) while(size-->0) *str++ = ' '; if (sign) *str++ = sign; if (type & SPECIAL) { if (base==8) *str++ = '0'; else if (base==16) { *str++ = '0'; *str++ = digits[33]; } } if (!(type & LEFT)) while (size-- > 0) *str++ = c; while (i < precision--) *str++ = '0'; while (i-- > 0) *str++ = tmp[i]; while (size-- > 0) *str++ = ' '; return str; } /* Forward decl. needed for IP address printing stuff... */ int sprintf(char * buf, const char *fmt, ...); size_t strnlen(const char * s, size_t count) { const char *sc; for (sc = s; count-- && *sc != '\0'; ++sc) /* nothing */; return sc - s; } int vsprintf(char *buf, const char *fmt, va_list args) { int len; #ifdef CFG_64BIT_VSPRINTF unsigned long long num; #else unsigned long num; #endif int i, base; char * str; const char *s; int flags; /* flags to number() */ int field_width; /* width of output field */ int precision; /* min. # of digits for integers; max number of chars for from string */ int qualifier; /* 'h', 'l', or 'q' for integer fields */ for (str=buf ; *fmt ; ++fmt) { if (*fmt != '%') { *str++ = *fmt; continue; } /* process flags */ flags = 0; repeat: ++fmt; /* this also skips first '%' */ switch (*fmt) { case '-': flags |= LEFT; goto repeat; case '+': flags |= PLUS; goto repeat; case ' ': flags |= SPACE; goto repeat; case '#': flags |= SPECIAL; goto repeat; case '0': flags |= ZEROPAD; goto repeat; } /* get field width */ field_width = -1; if (is_digit(*fmt)) field_width = skip_atoi(&fmt); else if (*fmt == '*') { ++fmt; /* it's the next argument */ field_width = va_arg(args, int); if (field_width < 0) { field_width = -field_width; flags |= LEFT; } } /* get the precision */ precision = -1; if (*fmt == '.') { ++fmt; if (is_digit(*fmt)) precision = skip_atoi(&fmt); else if (*fmt == '*') { ++fmt; /* it's the next argument */ precision = va_arg(args, int); } if (precision < 0) precision = 0; } /* get the conversion qualifier */ qualifier = -1; if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L' || *fmt == 'Z' || *fmt == 'z' || *fmt == 't' || *fmt == 'q' ) { qualifier = *fmt; if (qualifier == 'l' && *(fmt+1) == 'l') { qualifier = 'q'; ++fmt; } ++fmt; } /* default base */ base = 10; switch (*fmt) { case 'c': if (!(flags & LEFT)) while (--field_width > 0) *str++ = ' '; *str++ = (unsigned char) va_arg(args, int); while (--field_width > 0) *str++ = ' '; continue; case 's': s = va_arg(args, char *); if (!s) s = "<NULL>"; len = strnlen(s, precision); if (!(flags & LEFT)) while (len < field_width--) *str++ = ' '; for (i = 0; i < len; ++i) *str++ = *s++; while (len < field_width--) *str++ = ' '; continue; case 'p': if (field_width == -1) { field_width = 2*sizeof(void *); flags |= ZEROPAD; } str = number(str, (unsigned long) va_arg(args, void *), 16, field_width, precision, flags); continue; case 'n': if (qualifier == 'l') { long * ip = va_arg(args, long *); *ip = (str - buf); } else { int * ip = va_arg(args, int *); *ip = (str - buf); } continue; case '%': *str++ = '%'; continue; /* integer number formats - set up the flags and "break" */ case 'o': base = 8; break; case 'X': flags |= LARGE; case 'x': base = 16; break; case 'd': case 'i': flags |= SIGN; case 'u': break; default: *str++ = '%'; if (*fmt) *str++ = *fmt; else --fmt; continue; } #ifdef CFG_64BIT_VSPRINTF if (qualifier == 'q') /* "quad" for 64 bit variables */ num = va_arg(args, unsigned long long); else #endif if (qualifier == 'l') { num = va_arg(args, unsigned long); } else if (qualifier == 'Z' || qualifier == 'z') { num = va_arg(args, size_t); } else if (qualifier == 't') { num = va_arg(args, long); } else if (qualifier == 'h') { num = (unsigned short) va_arg(args, int); if (flags & SIGN) num = (short) num; } else if (flags & SIGN) num = va_arg(args, int); else num = va_arg(args, unsigned int); str = number(str, num, base, field_width, precision, flags); } *str = '\0'; return str-buf; } int sprintf(char * buf, const char *fmt, ...) { va_list args; int i; va_start(args, fmt); i=vsprintf(buf,fmt,args); va_end(args); return i; } void printf (const char *fmt, ...) { va_list args; char printbuffer[100]; va_start (args, fmt); /* For this to work, printbuffer must be larger than * anything we ever want to print. */ vsprintf (printbuffer, fmt, args); va_end (args); __uart_puts (printbuffer); }