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16-Bit Language Tools Libraries
? -fno-short-double will cause the compiler to generate calls to formatted I/O
routines that support double as if it were a long double type.
Mixing modules compiled with these options may result in a larger executable size, or
incorrect execution if large and small double-sized data is shared across modules.
2.13.2
Customizing STDIO
and close() which are called to read, write, open or close handles that are associated
with standard I/O FILE pointers. The sources for these libraries are provided for you to
customize as you wish.
The simplest way to redirect standard I/O to the pheripheral of your choice is to select
one of the default handles already in use. Also, you could open files with a specific
name, via fopen() , by rewriting open() to return a new handle to be recognized by
read() or write() , as appropriate.
If only a specific peripheral is required, then you could associate handle 1 == stdout ,
or 2 == stderr , to another peripheral by writing the correct code to talk to the
interested peripheral.
A complete generic solution might be:
/* should be in a header file */
enum my_handles {
handle_stdin,
handle_stdout,
handle_stderr,
handle_can1,
handle_can2,
handle_spi1,
handle_spi2,
};
int __ attribute __ (( __ weak __ , __ section __ (".libc"))) open(const char
*name, int access, int mode) {
switch (name[0]) {
case 'i' : return handle_stdin;
case 'o' : return handle_stdout;
case 'e' : return handle_stderr;
case 'c' : return handle_can1;
case 'C' : return handle_can2;
case 's' : return handle_spi1;
case 'S' : return handle_spi2;
default: return handle_stderr;
}
}
Single letters were used in this example because they are faster to check and use less
memory. However, if memory is not an issue, you could use strcmp to compare full
names.
In write() , you would write:
write(int handle, void *buffer, unsigned int len) {
int i;
volatile UxMODEBITS *umode = &U1MODEbits;
volatile UxSTABITS *ustatus = &U1STAbits;
volatile unsigned int *txreg = &U1TXREG;
volatile unsigned int *brg = &U1BRG;
switch (handle)
DS51456E-page 44
? 2008 Microchip Technology Inc.
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相关PDF资料
SW006015
C COMPILER MPLAB C32
SW300003-EVAL
LIBRARY SOFT MODEM-EVAL ONLY
SW300010-EVAL
SPEECH RECOG LIBRARY-EVAL ONLY
SW300040-EVAL
LIBRARY NOISE SUPPR-EVAL ONLY
SW300060-EVAL
LIBRARY ACOUSTIC ECHO-EVAL ONLY
SW300070-EVAL
SOFTWARE LIBR ENC/DEC EVAL ONLY
SW500012
HI-TECH C PRO FOR PIC32
SY87701LHI-EVAL
BOARD EVAL SY87701 EXPERIMENT
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