[ts-7000] Re: Can I use xdio of ts-7300 as CMOS sensor interface?

["zzmde" <>]

Thank you very much for your interpretation.
Now I meet with a new problem. After I reduce clock rate of CMOS 
sensor, I still cannot recognize each pixel value. Because the 
reading procedure seems not isochronous. Sometimes I read 638 data 
per line, sometimes 714 data per line. The extact pixel number should 
be 640 per line. Is it possible to make I/O speed isochronous?
The following is my code:

"
#include <assert.h>
#include <linux/config.h>
#include <linux/kernel.h>
#include <stdio.h>
#include <unistd.h>
#include "xdio.h"
#include <sys/mman.h>
#include <sys/types.h>
#include <string.h>
#include <stdlib.h>
#include <sys/time.h>
#include <fcntl.h>

#define MAP_SIZE 4096Ul
#define MAP_MASK (MAP_SIZE-1)

int main() 
{
unsigned int buf[1280*4];
unsigned char *virt_addr;
void *regs;
  struct xdio xdio1,xdio2,*xd1=0,*xd2=0;
  int i,n=0;
FILE* outfile;
int fd=open("/dev/mem", O_RDWR|O_SYNC);

regs=mmap(0,4096,
PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0x72000046&~MAP_MASK);

outfile=fopen("/home/zzm/xdio/test.txt", "w");
  if (open_xdio(&xdio1,0)) {
    xd1 = &xdio1;
  }
  if (open_xdio(&xdio2,1)) {
    xd2 = &xdio2;
  }
  
    assert(xd1); 
     assert(xd2); 

  printf("Clock xd2 period is %d ns\n",setClockSpeed(xd2,1));
  printf("Clock xd1 period is %d ns\n",setClockSpeed(xd1,1));  

  setMODE(xd1->base,0);
 setMODE(xd2->base,0);

virt_addr=regs+(0x72000046&MAP_MASK)+0x0000;
 for (i=0;i<1280*4;i++){
buf[i]=*virt_addr;
}
 for (i=0;i<1280*4;i++){
fprintf(outfile, "%x\t", buf[i]);
}

 fclose(outfile); 
  close_xdio(xd1);
  close_xdio(xd2);
  return 0;
}
"

Thanks
Zhaomin

--- In  David Hawkins <> wrote:
> Hi Zhaomin,
> 
> There is no difference in I/O speed between user-space and
> kernel space.
> 
> When you map /dev/mem into the process (user-space) application,
> the MMU is setup to map the XDIO to process addresses. If you
> work in the kernel, you end up doing something similar to
> get addresses mapped to the kernel.
> 
> The difference comes when you want to use interrupts, or want
> to allow non-root users to access the hardware.
> 
> You're better off to get things working first, and then
> decide later if you want to change things like users.
> 
> Cheers
> Dave
>




 
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