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Full Discussion: Writing to a Serial Port
Top Forums Web Development Writing to a Serial Port Post 302923104 by Corona688 on Thursday 30th of October 2014 11:17:11 AM
Old 10-30-2014
Okay, so minicom is using serial port timeouts. Let's see how that works for this.

Code:
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>

#include <stdio.h>
#include <string.h>

#define STDOUT_FILENO 1

int main() {
        const char *str="W\r\n";
        char buf[64];
        int pos=0;

        int fd=open("/dev/ttyS0", O_RDWR);
        if (fd < 0) {
            perror("Couldn't open");
        }

        // These WERE saved from when minicom was running, right?
        system("stty -F /dev/ttyS0 1:0:80000dad:0:3:1c:7f:15:4:5:1:0:11:13:1a:0:12:f:17:16:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0");

        write(fd, str, strlen(str));

        fprintf(stderr, "Wrote W\n");

        tcdrain(fd);

        while(read(fd, buf+pos, 1) == 1)
        {
                fprintf(stderr, "Read 0x%02x\n", (unsigned char)buf[pos]);
                if(buf[pos++] == '\n') break;
        }

        buf[pos]='\0';

        printf("got line:\n%s", buf);
}

If "W\r\n" doesn't work try "W\n"

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NE_BUFFER_APPEND(3)						neon API reference					       NE_BUFFER_APPEND(3)

NAME
ne_buffer_append, ne_buffer_zappend, ne_buffer_concat - append data to a string buffer SYNOPSIS
#include <ne_string.h> void ne_buffer_append(ne_buffer *buf, const char *string, size_t len); void ne_buffer_zappend(ne_buffer *buf, const char *string); void ne_buffer_concat(ne_buffer *buf, const char *str, ...); DESCRIPTION
The ne_buffer_append and ne_buffer_zappend functions append a string to the end of a buffer; extending the buffer as necessary. The len passed to ne_buffer_append specifies the length of the string to append; there must be no NUL terminator in the first len bytes of the string. ne_buffer_zappend must be passed a NUL-terminated string. The ne_buffer_concat function takes a variable-length argument list following str; each argument must be a char * pointer to a NUL-terminated string. A NULL pointer must be given as the last argument to mark the end of the list. The strings (including str) are appended to the buffer in the order given. None of the strings passed to ne_buffer_concat are modified. EXAMPLES
The following code will output "Hello, world. And goodbye.". ne_buffer *buf = ne_buffer_create(); ne_buffer_zappend(buf, "Hello"); ne_buffer_concat(buf, ", world. ", "And ", "goodbye.", NULL); puts(buf->data); ne_buffer_destroy(buf); SEE ALSO
ne_buffer, ne_buffer_create, ne_buffer_destroy AUTHOR
Joe Orton <neon@lists.manyfish.co.uk> Author. COPYRIGHT
neon 0.30.0 31 July 2013 NE_BUFFER_APPEND(3)
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