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<blockquote data-quote="omr_treb22" data-source="post: 928007" data-attributes="member: 127920">Hello all,to control a solar installation, I've made an electronic board based on a PIC which outputs data (temperatures, ...) on a RS232 serial link @9600bps. To log data, I've bought an USB-serial convertor that I connected to my iMac. I've tested this link with a software like &quot;coolTerm&quot;, everything is fine !Now, to store all this data and to provide it on a web site, I want to write a C program on the MAC to read data from USB-serial link and generate some kinds of HTML pages.My first C lines on MAC (my frist try after several years under Linux) start hardly : this easy program crashes on open function (it seems definitely locked...) ??? I've tried to add O_NONBLOCK attribute to open function, then it returns a correct fd, but read function returns &quot;resource temporarily unavailable&quot;.Does someone has an idea about this problem ?Thanks for help ! [code]int main(int argc, char **argv){&nbsp; &nbsp; int fd;&nbsp; &nbsp; int ret;&nbsp; &nbsp; char c;&nbsp; &nbsp; &nbsp; &nbsp; printf(&quot;open /dev/tty.usbserial...\n&quot;);&nbsp; &nbsp; fd = open(&quot;/dev/tty.usbserial&quot;, O_RDONLY);&nbsp; &nbsp; printf(&quot;...Serial port open - Return code : %d\n&quot;, fd);&nbsp; &nbsp; if (fd &lt; 0)&nbsp; &nbsp; &nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; printf(&quot;Erreur a l'ouverture de /dev/tty.usbserial - Code=%d\n&quot;, fd);&nbsp; &nbsp; &nbsp; &nbsp; exit(1);&nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; &nbsp; &nbsp; printf(&quot;Serial port opened...\n&quot;);&nbsp; &nbsp; &nbsp; &nbsp; while (1)&nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; ret = read(fd, &amp;c, 1);&nbsp; &nbsp; &nbsp; &nbsp; if (ret == 1)&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; printf(&quot;%c&quot;, c);&nbsp; &nbsp; &nbsp; &nbsp; else&nbsp; &nbsp; &nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; perror(&quot;Error read &quot;);&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; close(fd);&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; return 1;&nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; }&nbsp; &nbsp; &nbsp; &nbsp; printf(&quot;close /dev/tty.usbserial\n&quot;);&nbsp; &nbsp; close(fd);&nbsp; &nbsp; return 0;}[/code]</blockquote>

[QUOTE="omr_treb22, post: 928007, member: 127920"] Hello all, to control a solar installation, I've made an electronic board based on a PIC which outputs data (temperatures, ...) on a RS232 serial link @9600bps. To log data, I've bought an USB-serial convertor that I connected to my iMac. I've tested this link with a software like "coolTerm", everything is fine ! Now, to store all this data and to provide it on a web site, I want to write a C program on the MAC to read data from USB-serial link and generate some kinds of HTML pages. My first C lines on MAC (my frist try after several years under Linux) start hardly : this easy program crashes on open function (it seems definitely locked...) ??? I've tried to add O_NONBLOCK attribute to open function, then it returns a correct fd, but read function returns "resource temporarily unavailable". Does someone has an idea about this problem ? Thanks for help ! [code]int main(int argc, char **argv) { int fd; int ret; char c; printf("open /dev/tty.usbserial...\n"); fd = open("/dev/tty.usbserial", O_RDONLY); printf("...Serial port open - Return code : %d\n", fd); if (fd < 0) { printf("Erreur a l'ouverture de /dev/tty.usbserial - Code=%d\n", fd); exit(1); } printf("Serial port opened...\n"); while (1) { ret = read(fd, &c, 1); if (ret == 1) printf("%c", c); else { perror("Error read "); close(fd); return 1; } } printf("close /dev/tty.usbserial\n"); close(fd); return 0; } [/code] [/QUOTE]

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