[ts-7000] bad A/D performance problem on ts9700

[Doug Chapman <>]

I just got my ts7260 (the new model) along with a ts9700 A/D converter
the other day.  I wrote some code to read the A/D off of the 9700 which
appears to give me proper values however it is really REALLY slow.  It
is taking .5 sec or more for each A/D conversion.  According to the
manual it should take 18ms.  Not sure if I am doing something wrong or
if there is something wrong with my board.

The following code demonstrates the issue.  It takes 10 samples and
calculates the time.  It takes 5 to 8 seconds to do 10 samples.

Anybody have any ideas what is going on here?

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

#define BASE 0x11C00000
#define ADBASE 0x160
#define ADCOMMAND ADBASE
#define ADREADYBIT 7

#define CHANNEL 0

#define NUM_SAMPLES 10
#define USEC_PER_SEC 1000000

typedef unsigned char byte;

main(){
    byte *base;
    volatile byte *adcommand;
    int fd;
    struct timeval now;
    long long start_usec;
    long long end_usec;
    int i;

    fd = open ("/dev/mem" , O_RDWR);
    if (fd < 0){
        perror ("open");
        exit(1);
    }

    base = (byte *)mmap(0, getpagesize(),
            PROT_READ | PROT_WRITE, MAP_SHARED, fd, BASE);
    if (base == MAP_FAILED){
        perror ("mmap");
        exit(1);
    }

    adcommand = base + ADCOMMAND;

    while (1){
        gettimeofday(&now,NULL);
        start_usec = now.tv_sec * USEC_PER_SEC + now.tv_usec;
        for (i=0; i<NUM_SAMPLES; i++){
            *adcommand = CHANNEL;
        perror ("mmap");
        exit(1);
    }

    adcommand = base + ADCOMMAND;

    while (1){
        gettimeofday(&now,NULL);
        start_usec = now.tv_sec * USEC_PER_SEC + now.tv_usec;
        for (i=0; i<NUM_SAMPLES; i++){
            *adcommand = CHANNEL;
            while(!(*adcommand & (1 << ADREADYBIT)))
                ;
        }
        gettimeofday(&now,NULL);
        end_usec = now.tv_sec * USEC_PER_SEC + now.tv_usec;

        printf ("%d samples took %f sec\n\n",NUM_SAMPLES,
                (double)(end_usec - start_usec) /
(double)USEC_PER_SEC);
    }

}




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