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#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <stdlib.h>
// data via stdin
// begin = 255 followed by 9 byte 8 mal i + 1 mal u
// u = input * 5/256 // u in V
// i = input / 2.099 // i in mA
#define UFAC 5.0f/256.0f*5.6f/1.89f
int main (int argc, char* argv[])
{
unsigned char tmp = 0;
unsigned char buffer[9];
float pow;
float pow_sum;
int i;
int n=0;
unsigned char *outbuffer;
int outfile_fd = -1;
if (argc > 1)
{
outfile_fd = open(argv[1], O_WRONLY | O_CREAT | O_APPEND, 0666);
}
while (read (STDIN_FILENO, &tmp, 1) == 1)
{
if (tmp == 255)
{
if (read (STDIN_FILENO, &buffer, 9) != 9)
{
printf ("read error\n");
return 0;
}
printf ("%5.2fV", buffer[8] * UFAC);
pow_sum = 0.0f;
for (i = 0; i<8; i++)
{
pow = (buffer[i] / 2.099f) * (buffer[8] * UFAC);
printf (" %6.2fmW", pow);
pow_sum += pow;
if (outfile_fd > 0)
{
n = asprintf(&outbuffer, "%d %6.2f %6.2f\n", i, buffer[8]*UFAC, buffer[i]/2.099f);
write(outfile_fd, outbuffer , n);
free(outbuffer);
}
}
if (outfile_fd > 0)
write(outfile_fd, "\n" , 1);
printf (" %6.2fmW", pow_sum);
printf ("\r");
}
}
printf ("\n");
if (outfile_fd > 0)
close(outfile_fd);
return 0;
}
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