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

["ugumugu" <>]

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" <> 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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