C166 User's Guide
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C166 User's Guide

C166 Introduction Compiling Programs Language Extensions Preprocessor Advanced Programming Error Messages Library Reference Library Files Source Code Standard Types jmp_buf ptrdiff_t size_t va_list wchar_t Macros HARRAY HVAR MARRAY MVAR XARRAY XVAR Routines By Category Buffer Manipulation Routines Character Routines Data Conversion Routines Intrinsic Routines Math Routines Memory Allocation Routines Stream I/O Routines String Routines Variable Length Argument Routines Miscellaneous Routines Include Files SFR Definitions absacc.h assert.h ctype.h float.h intrins.h limits.h math.h membox.h setjmp.h stdarg.h stddef.h stdio.h stdlib.h string.h Reference _alloc_boxf _alloc_boxh _alloc_boxn _atomic_ _bfld_ _calloc_boxf _calloc_boxh _calloc_boxn _chkdouble_ _chkfloat_ _crol_ _cror_ _diswdt_ _einit_ _endatomic_ _free_boxf _free_boxh _free_boxn _getkey _idle_ _init_boxf _init_boxh _init_boxn _irol_ _iror_ _lrol_ _lror_ _nop_ _pop_ _prior_ _priord_ _push_ _pwrdn_ _sof_ _srvwdt_ _testclear_ _testset_ _tolower _toupper _trap_ abs acos asin assert atan atan2 atof atoi atol calloc calloc_b ceil cos cosh exp fabs floor fmemccpy fmemchr fmemcmp fmemcpy fmemmove fmemset fmod free free_b fstrcat fstrchr fstrcmp fstrcpy fstrcspn fstrlen fstrncat fstrncmp fstrncpy fstrpbrk fstrpos fstrrchr fstrrpbrk fstrrpos fstrspn getchar gets hmemcmp hmemcpy hstrcmp hstrcpy init_mempool init_mempool_b isalnum isalpha iscntrl isdigit isgraph islower isprint ispunct isspace isupper isxdigit labs log log10 longjmp malloc malloc_b memccpy memchr memcmp memcpy memmove memset modf offsetof pow printf putchar puts rand realloc realloc_b scanf setjmp sin sinh sprintf sqrt srand sscanf strcat strchr strcmp strcpy strcspn strlen strncat strncmp strncpy strpbrk strpos strrchr strrpbrk strrpos strspn strstr strtod strtol strtoul tan tanh toascii toint tolower toupper ungetchar va_arg va_end va_start vprintf vsprintf xcalloc xfree xinit_mempool xmalloc xmemccpy xmemchr xmemcmp xmemcpy xmemmove xmemset xrealloc xstrcmp xstrcpy xstrlen xstrncpy Appendix

Stream I/O Routines

RoutineAttributesDescription
getchar Reads and echoes a character using the _getkey and putchar routines.
_getkey Reads a character using the serial interface.
gets Reads and echoes a character string using the getchar routine.
printf Writes formatted data using the putchar routine.
putchar Writes a character using the serial interface.
putsreentrantWrites a character string and newline ('\n') character using the putchar routine.
scanf Reads formatted data using the getchar routine.
sprintfreentrantWrites formatted data to a string.
sscanfreentrantReads formatted data from a string.
ungetchar Places a character back into the getchar input buffer.
vprintf Writes formatted data using the putchar function.
vsprintfreentrantWrites formatted data to a string.

The stream I/O routines are implemented as functions and are prototyped in the stdio.h include file.

The stream input and output routines allow you to read and write data to and from a user-defined I/O interface. Characters are read using the _getkey routine and are written using the putchar routine. The default _getkey and putchar functions in the library read and write characters using the C16x serial interface.

The source code for _getkey and putchar is available in the \KEIL\C166\LIB folder. You may modify these files and substitute them for the default library routines. The stream functions then perform input and output using your modified _getkey and putchar routines.

To use the existing _getkey and putchar routines, you must first initialize the serial port. If the serial port is not properly initialized, the default stream functions do not function. Initializing the serial port requires manipulating several special function registers (SFRs).

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