Svenska ElektronikForumet

Kod: Markera allt

#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 */

 /*
  * 'open_port()' - Open serial port 1.
  *
  * Returns the file descriptor on success or -1 on error.
  */

 int open_port(void)
 {
   int fd;                                   /* File descriptor for the port */

   fd = open("/dev/ttyS0", O_RDWR | O_NOCTTY | O_NDELAY);

   if (fd == -1)
   {                                              /* Could not open the port */
     fprintf(stderr, "open_port: Unable to open /dev/ttyS1 - %s\n",
             strerror(errno));
   }

   return (fd);
 }

void main()
{
 int mainfd=0;                                           /* File descriptor */
 char chout;
 struct termios options;
   
 mainfd = open_port();

 fcntl(mainfd, F_SETFL, FNDELAY);                  /* Configure port reading */
                                     /* Get the current options for the port */
 tcgetattr(mainfd, &options);
 cfsetispeed(&options, B110);                 /* Set the baud rates to 9600 */
 cfsetospeed(&options, B110);
    
                                   /* Enable the receiver and set local mode */
 options.c_cflag |= (CLOCAL | CREAD);
 options.c_cflag &= ~PARENB; /* Mask the character size to 8 bits, no parity */
 options.c_cflag &= ~CSTOPB;
 options.c_cflag &= ~CSIZE;
 options.c_cflag |=  CS8;                              /* Select 8 data bits */
 options.c_cflag &= ~CRTSCTS;               /* Disable hardware flow control */  
 
                                 /* Enable data to be processed as raw input */
 options.c_lflag &= ~(ICANON | ECHO | ISIG);
       
                                        /* Set the new options for the port */
 tcsetattr(mainfd, TCSANOW, &options);
                        
 while (1)
 {
   read(mainfd, &chout, sizeof(chout));          /* Read character from ABU */
   
   if (chout != 0)
      printf("Got %c\n", chout);
   chout=0;
}
                                                    /* Close the serial port */
  close(mainfd);
 }

Kod: Markera allt

#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 */
#include <time.h>

#define interval 5

/*
  * 'open_port()' - Open serial port 1.
  *
  * Returns the file descriptor on success or -1 on error.
  */

int open_port(void)
{
   int fd;                                   /* File descriptor for the port */

   fd = open("/dev/ttyS0", O_RDWR | O_NOCTTY | O_NDELAY);

   if (fd == -1)
   {                                              /* Could not open the port */
     fprintf(stderr, "open_port: Unable to open /dev/ttyS1 - %s\n",
             strerror(errno));
   }

   return (fd);
}

void main()
{
int mainfd=0;                                           /* File descriptor */
char chout;
struct termios options;
time_t start,earlier, now;
long pulseCount,pulseIntegral;
double currentPower,averagePower,ackumulatedEnergy;
char theTime[25];
   
mainfd = open_port();

fcntl(mainfd, F_SETFL, FNDELAY);                  /* Configure port reading */
                                     /* Get the current options for the port */
tcgetattr(mainfd, &options);
cfsetispeed(&options, B110);                 /* Set the baud rates to 9600 */
cfsetospeed(&options, B110);
   
                                   /* Enable the receiver and set local mode */
options.c_cflag |= (CLOCAL | CREAD);
options.c_cflag &= ~PARENB; /* Mask the character size to 8 bits, no parity */
options.c_cflag &= ~CSTOPB;
options.c_cflag &= ~CSIZE;
options.c_cflag |=  CS8;                              /* Select 8 data bits */
options.c_cflag &= ~CRTSCTS;               /* Disable hardware flow control */ 

                                 /* Enable data to be processed as raw input */
options.c_lflag &= ~(ICANON | ECHO | ISIG);
       
                                        /* Set the new options for the port */
tcsetattr(mainfd, TCSANOW, &options);


pulseCount=0;
pulseIntegral=0;
start=earlier=time();


printf("Time\t\tCurrent Power(W)\tAverage Power(W)\tAckumulated Energy(kWh)\n");
while (1)
{
   read(mainfd, &chout, sizeof(chout));          /* Read character from ABU */
 
   if (chout != 0)
   {
      pulseCount++;
      chout=0;

      now=time();  
      if ((now-earlier)>=interval)
      {
         pulseIntegral+=pulseCount;

         currentPower=(double)pulseCount*(3600/10)/(now-earlier);
         averagePower=(double)pulseIntegral*(3600/10)/(now-start);
         ackumulatedEnergy=(double)pulseIntegral/10000;
      
         strftime(theTime,sizeof(theTime),"%d-%m-%y %H:%M:%S",now)   
         printf("%s\t%f\t%f\t%f\n",
                theTime,currentPower,averagePower,ackumulatedEnergy);
         earlier=now;
      }
   }


   sleep(0); /* Give other processes some time */
}
                                                    /* Close the serial port */
  close(mainfd);
}