[ts-7000] Re: Hi Ts7250 + ts 9700 DAC Problem

["brandonchristel" <>]

Sorry to drag up a new thread, but when I run this line, my 7260 just
sits there a long time, waiting for this to execute. I really dont
know what this does, so can anyone help me?
48              while(!(*adcommand & (1 << ADREADYBIT)));

i have changed his source code to read a given line and return the
voltage as a float.  here's the code I changed.

thanks for the help
brandon


#include <stdio.h>
#include <fcntl.h>
#include <sys/mman.h>

#define BASE 0x11C00000
#define ADBASE 0x168
#define ADCOMMAND ADBASE
#define ADDATA 0x16A
#define LDAC 0x16C
#define MDAC 0x16D

#define ADREADYBIT 7
#define NUM_CHANNELS 5

typedef unsigned char byte;

float getA2Dline(int lineNumber)
{
        byte *base;
        volatile byte *adcommand;
        volatile byte *lsb;
        volatile byte *msb;
        volatile byte *ldac;
        volatile byte *hdac;
        unsigned short int val;
        
        int fd;
        float volts;
        int i;
        fd = open ("/dev/mem" , O_RDWR|O_SYNC);
        base = (byte *)mmap(0, getpagesize(), PROT_READ | PROT_WRITE,
                                                MAP_SHARED, fd, BASE);
        adcommand = base + ADCOMMAND;
        lsb = base + ADDATA;
        msb = base + ADDATA + 1;
        ldac = base + LDAC;
        hdac = base + MDAC;
        
        val = 255;
        //val |= (0x0 << 14);
        *ldac = val;
        val = 7;
        *hdac = val;
        
        
        
        *adcommand = lineNumber;
        while(!(*adcommand & (1 << ADREADYBIT)));
        volts = (256 * *msb + *lsb) * 2.5 / 4096;
        return volts;
                                
}




--- In  "ugumugu" <> wrote:
>
> The code succesfully compiled and running on the sbc. 
> 
> Thank you all for your advices.
> 
> Now the below code is working 
> 
> Best Regards
> 
> ugurtan
> 
> 
> 
> 
> #include <stdio.h>
> #include <fcntl.h>
> #include <sys/mman.h>
> 
> #define BASE 0x11C00000
> #define ADBASE 0x168
> #define ADCOMMAND ADBASE
> #define ADDATA 0x16A
> #define LDAC 0x16C
> #define MDAC 0x16D
> 
> #define ADREADYBIT 7
> #define NUM_CHANNELS 5
> 
> typedef unsigned char byte;
> 
> main(){
>   byte *base;
>   volatile byte *adcommand;
>   volatile byte *lsb;
>   volatile byte *msb;
>   volatile byte *ldac;
>   volatile byte *hdac;
>   unsigned short int val;
> 
>   int fd;
>   float volts;
>   int i,j;
>   fd = open ("/dev/mem" , O_RDWR|O_SYNC);
>   base = (byte *)mmap(0, getpagesize(), PROT_READ | PROT_WRITE,
> MAP_SHARED, fd, BASE);
>   adcommand = base + ADCOMMAND;
>   lsb = base + ADDATA;
>   msb = base + ADDATA + 1;
>   ldac = base + LDAC;
>   hdac = base + MDAC;
> 
>   val = 255;
>   //val |= (0x0 << 14);
>   *ldac = val;
>   val = 7;
>   *hdac = val;
> 
> 
>   
> while (1) {
>   for (j=0; j<NUM_CHANNELS; j++)
>   {
>     *adcommand = j;
>     while(!(*adcommand & (1 << ADREADYBIT)));
>     volts = (256 * *msb + *lsb) * 2.5 / 4096;
>     printf ("%1.3f ",volts);
>   }
>   printf("\n");
> usleep(100000);
> }
> }
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> --- In  "Andy Mercier" <andynmercier@> wrote:
> >
> > --- In  "ugumugu" <ugu@> wrote:
> > >
> > > Hi everybody,
> > > 
> > > I use below source to use the ts9700,
> > > 
> > > While everything on the ADC part is perfect, there is no output
on the
> > > DAC side.
> > > 
> > > Could you please give me some advice on it.
> > > 
> > > 
> > > Best Regards.
> > > F. Ugurtan Erdem
> > > *******************
> > >volatile byte *ldac;
> > >volatile byte *hdac;
> > >   :
> > >   :
> > >ldac = base + DAC;
> > >hdac = base + DAC + 1;
> > >   :
> > >   :
> > >   *ldac = val;
> > >   *hdac = 0xFF;
> > >   :
> > > ***********************************
> > >
> > 
> > Are you compiling with "-mcpu=arm9"?
> > 
> > Ref. last paragraph of section 7.4 in
> > http://www.embeddedarm.com/Manuals/linuxarm-guide-rev2.3.pdf
> > 
> > ----
> > Andy
> >
>




 
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