[Elphel-support] channel switching and exposure question

[Andreas Bean]

Andrey, Oleg,

Yes I have an older version of 359.bit because in some newer versions
the combining mode didn't work. I haven't tried the latest version.
In my version reg_write.php is called with the values 835 and 02 and
does switch the sensor.
fpcf does not. I still don't understand why. Anyway, I will update and
try the commands mentioned below.
Should the combining/alternating modes work in the current version?

Andrey, nor fpcf or reg_write.php follow the safety procedure you
mentioned in your last mail, do they?
If I understand you right then placing i²c commands through the
sequencer is the safer option. How can I do that from c? Can you tell me
a starting point for further code investigation?

Andreas

Oleg K Dzhimiev schrieb:
> Adreas,
>
> Sorry, I didn't tell you - I changed reg addresses in 10359 a while
> ago (in Jan-Feb) - you can find new addresses here:
> http://wiki.elphel.com/index.php?title=Talk:10359
> I will update this page today-tomorrow - there're small updates - as
> for direct channel switching the info is correct:
>
>     fpcf -i2cw16 806 1
>
>     fpcf -i2cw16 806 2
>
>     fpcf -i2cw16 806 3
>
>
> Best regards,
> Oleg
>
> On 6 September 2010 04:59, Andreas Bean <office at beanbox.com
> <mailto:office at beanbox.com>> wrote:
>
>     Hi Andrey,
>
>     Thank you for your answer. See the code snippets below. Both open
>     the device /dev/xi2c16.
>     reg_write.php is called with the parameters 0x835 0x2 to switch to
>     channel 2.
>     Why doesn't the command
>
>     fpcf -i2cw16 0x835 0x02
>
>     do the same? Both write to /dev/xi2c16
>     I prefer to set the values from c, directly. Thank you for the
>     info about the possibility of an inconsistency on driver level.
>     But I don't think that this is the problem here.
>
>     Do you know why the two code snippets don't do the same?
>
>     Andreas
>
>     ---------------------------- fpcf.c -------------------------------
>         shft=-1;
>         if (strcasecmp(argv[1], "-i2cw8")  ==0) shft=0;
>         if (strcasecmp(argv[1], "-i2cw16") ==0) shft=1;
>         if (shft>=0) { // write i2c bus0
>           if (argc<3) {printf("Need I2C address (hex) to write:
>     register address + 256* (slave address>>1)\r\n");return -1;}
>           if (argc<4) {printf("Need data (hex) to write to i2c bus
>     0\r\n");return -1;}
>            sa= strtol (argv[2],&cp,16);
>           uld=strtol (argv[3],&cp,16);
>           if (shft==1) {
>              if ((devfd = open("/dev/xi2c16", O_RDWR))<0) 
>     {printf("error opening /dev/xi2c16\r\n"); return -1;}
>              uld= ((uld >>8) & 0xff) | ((uld <<8) & 0xff00);
>           } else {
>              if ((devfd = open("/dev/xi2c8",  O_RDWR))<0) 
>     {printf("error opening /dev/xi2c8\r\n"); return -1;}
>           }
>           if ((res=lseek(devfd,sa<<shft,0))<0) {
>             printf("lseek failed, returned %d\n",res);
>             close (devfd);
>             return -1;
>           }
>           if ((res=write(devfd,&uld,1<<shft))<(1<<shft)) {
>             printf("write failed, returned %d, expected - %d\n",res,
>     (1<<shft));
>             close (devfd);
>             return -1;
>           }
>           close (devfd);
>           return 0;
>         }
>     ---------------------------- reg_write.php -------------------------
>     function send_i2c_4($a,$d) {
>        $i2c  = fopen('/dev/xi2c16', 'w');
>        fseek ($i2c, 2*$a) ;
>        if ($w==1)    $res=fwrite($i2c, chr ($d));
>        else    {
>           $res=fwrite($i2c, chr (floor($d/(256*256*256))).chr (($d -
>     256*256*256*floor($d/(256*256*256)))/(256*256)).chr (($d -
>     256*256*floor($d/(256*256)))/256).chr ($d - 256*floor($d/(256))) );
>           printf("v1=%d\n",floor($d/(256*256*256)));
>           printf("v2=%d\n",($d -
>     256*256*256*floor($d/(256*256*256)))/(256*256));    
>           printf("v3=%d\n",($d - 256*256*floor($d/(256*256)))/256);    
>           printf("v4=%d\n",$d - 256*floor($d/(256)));         
>
>        }
>          
>        fclose($i2c);
>        return $res;
>     }
>
>
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>

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