000
20.07.2004, 10:09 Uhr
~wasa
Gast
|
tagchen!
kann mir jemand erklären was der folgende Code zu sagen hat bzw. was da gemacht wird!?
DANKE SCHONMAL!!!!!!
Ich komme damit echt nicht zurecht!!!
DANKE cu wasa
| C++: |
int digit(int x)
{
int dig[10]={0xd7,0x05,0x5b,0x1f,0x27,0x3e, 0x7e,0x15,0x7f, 0x3f};
int n;
x=x&0x7f;
for(n=0;n<10;n++)
if (x==dig[n])
return n;
return 0;
}
/*---------------------------------------------------------------------*/
char *dvm_unit(int y, int x, char *s)
{
char *prefix="";
char *unit="";
char *ext="";
char *ext1="";
if (x&0x2000)
ext="delta";
else if (x&0x100000)
ext="Diode";
else if (x&0x10000)
ext="Beep";
if (x&0x080000)
prefix="m";
else if (x&0x800000)
prefix="u";
else if (x&0x400000)
prefix="n";
else if (x&0x020000)
prefix="M";
else if (x&0x200000)
prefix="k";
if (x&0x0800)
unit="A";
else if (x&0x0200)
unit="Hz";
else if (x&0x40000)
unit="%";
else if (x&0x10)
unit="°C";
else if (x&0x4000)
unit="Ohm";
else if (x&0x0400)
unit="V";
else if (x&0x8000)
unit="F";
sprintf(s,"%s%s %s (%s)",prefix, unit,
(y&0x8?"AC":""),
ext);
}
/*---------------------------------------------------------------------*/
int main(int argc,char **argv)
{
unsigned char data;
unsigned char buffer[100];
unsigned char buffer1[9];
char units[20];
int n;
float it;
unsigned int t,tf;
fd=open_serial("/dev/ttyS0", 2400);
set_rts_dtr(fd); // DTR/RTS setzen
while(1)
{
n=0;
memset(buffer,0,20);
while(1)
{
read(fd,&buffer[n],1);
if ((buffer[n]&0xf0)==0xe0 || (n==16))
break;
n++;
}
#if 0
// Raw output
for(n=0;n<16;n++)
printf("%02x ",buffer[n]);
#endif
buffer1[0]=buffer[0]&15;
for(n=0;n<8;n++)
buffer1[1+n]=((buffer[2*n+1]&15)<<4)|(buffer[2*n+2]&15);
#if 0
// Nibble compacted data
for(n=0;n<8;n++)
printf("%02x ",buffer1[n]);
printf("%i%i%i%i\n",digit(buffer1[1]),digit(buffer1[2]),
digit(buffer1[3]),digit(buffer1[4]));
#endif
if ((buffer1[3]&0x7f)==0x68)
it=9999999;
else
it=1000.0*digit(buffer1[1])+100.0*digit(buffer1[2])
+10*digit(buffer1[3])+1*digit(buffer1[4]);
if (buffer1[4]&0x80)
it=it/10.0;
if (buffer1[3]&0x80)
it=it/100.0;
if (buffer1[2]&0x80)
it=it/1000.0;
if (buffer1[1]&0x80)
it=-it;
dvm_unit(buffer1[0], (buffer1[5]<<16)|(buffer1[6]<<8)|buffer1[7],units);
timestamp();
printf("%0.3f %s\n",it, units);
fflush(stdout);
}
}
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