Re: [iPAQ] [Serial programming]read(fd,buf, 0) doesn't return zero .. .

At first sight, many problems in this source:

> #define _POSIX_SOURCE 1 /* code source conforme à POSIX */
This should be placed *before* any #include or better, as a gcc option
(e.g. -D_POSIX_SOURCE=1).
> buf = (char *) malloc (10*sizeof(char));
> answ = (char *) malloc (10*sizeof(char));

What for? If the size of the buffers is fixed, "char buf[10]; char
answ[10];" is preffered (particularly if you don't free() them afterwards).

>
> bzero(&newtio, sizeof(newtio));
> newtio.c_cflag = BAUDRATE | CRTSCTS | CS8 | CLOCAL | CREAD;
> newtio.c_iflag = IGNPAR;
> newtio.c_oflag = 0;
>
> /* positionne le mode de lecture (non canonique, sans echo, ...) */
> newtio.c_lflag = 0;
>
> newtio.c_cc[VTIME] = 0; /* timer inter-caractères non utilisé */
> newtio.c_cc[VMIN] = 0; /* read bloquant jusqu'à ce que 5 */
> /* caractères soient lus */

Bad, bad, don't set up serial flags this way. Use tcgetattr() to get
their status, then use statements like "newtio.c_cflag |= " and
"newtio.c_cflag &= ~" to modify them, finally apply these changes with
tcsetattr(). The glibc manual is your friend here, there are several
useful examples in it.

Bonne chance pour la suite,

Achille

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Received on Wed Mar 24 13:28:27 2004