c - Sending Hexadecimal data through Serial Port Communication in Linux -

i have got task of sending hexadecimal data comport in linux. have written simple c code, sends decimal number. can me in sending hexadecimal bit.

here code have written

#include <stdio.h>   /* standard input/output definitions */ #include <string.h>  /* string function definitions */ #include <unistd.h>  /* unix standard function definitions */ #include <fcntl.h>   /* file control definitions */ #include <errno.h>   /* error number definitions */ #include <termios.h> /* posix terminal control definitions */  int number,n; void main(void){ open_port();  }    int open_port(void) {   int fd; /* file descriptor port */     fd = open("/dev/ttyacm0", o_rdwr | o_noctty | o_ndelay);   if (fd == -1)   {  perror("open_port: unable open /dev/ttyacm0 - ");   }   else{      printf("port opened successfully\n");      number = 1;      while(number!=55){      scanf("%d",&number);       n = write(fd, "atz\r", number);      if (n < 0)      fputs("write() of 4 bytes failed!\n", stderr);      }   }    return (fd); } 

please help

thanks in advance :) :)

write defined as:

 ssize_t write(int fd, const void *buf, size_t count); 

that is, sends count bytes fd buf. in case, data string "aztr\r", plus undefined data after (if count > 5). program sends neither hexadecimal nor decimal data.

do want send binary data or string of hexadecimal characters?

for option one, can use: write(fd, somebuffer, len);, buffer pointer set of bytes (including ints, etc).

for option two, first convert data hexadecimal string using sprintf %02x format string, proceed write data port.