[M560x-driver-devel] m5603 SOF detection

[Franck B. <fbo...@ch...>]

Le dimanche 30 décembre 2007 18:56, Jérémy Lal a écrit :
> at least i got "something" this time (kernel 2.6.23) :
> i got some very dark, black and white picture, "interlaced" and repeated
> like five times horizontally. i played around with the pitch to get
> vertical alignment better.
>

Hello,
from my original source(tm) driver,
for the ali5603 and any sensor,
the SOF if based on this:

int ali5603c_sofdetect(struct Cam *cam, char *data, int *skip,  int 
*datalength)
{

    if (*datalength == 0)
    {
        if(cam->ali5603c.AwbCounter++ >50)
        {
            /* enqueue a defered call to SetAwb */
	    /* in IRq context, no synchronous call ! */
            /*AsyncUsbSetIndex(spca50x, xbAwbMinB, 1);*/

        }
    }

    if (cam->ali5603c.DSPCtrlBit60Cleared == 0)
    {
        cam->ali5603c.DSPCtrlBit60Cleared = 1;
        /* enqueue a defered call to  with the last known state for DSPCtrl*/
        AsyncUsbSetIndex(spca50x,xbDSPCTRL,cam->ali5603c.DSPCtrl & 0x9F);
    }

    *skip = 0;
    switch (cam->ali5603c.SofState)
    {
    case SOF_Wait: /*0*/
        if (*datalength == 0)
        {
            cam->ali5603c.SofState = SOF_Start;
            cam->ali5603c.FrameAcquiringOffset = 0;
        }
        break;

    case SOF_Start:/* 1 Sof if a non empty packet follow SOF_Wait*/
        if (datalength == 0)
            break;      /*not now*/

        //falltrougth, First packet of data!
        cam->ali5603c.SofState = SOF_Acquiring;

    case SOF_Acquiring: /* 2 */
        if (*datalength != 0)   /*have data*/
        {
            if (cam->ali5603c.FrameAcquiringOffset == 0) /* beginning*/
            {
                //DecrementLevels(); /* to discover purpose */
	      /* strangely, no 4 bytes skipped.... */
            }
            else
            {
                /*allways remove usb header (FF,FF,FF,FF)*/
                *skip = 4;
                *datalength -= 4;
            }

#define ABS_MAXFRAME 0xE1006
            /* check it is not too big */
            if (cam->ali5603c.FrameAcquiringOffset + *datalength > 
ABS_MAXFRAME)
            {
                cam->ali5603c.FrameAcquiringOffset = ABS_MAXFRAME;
                cam->ali5603c.SofState = SOF_Wait;
                return 1; /* it is a sof! */
            }
            else
                cam->ali5603c.FrameAcquiringOffset += *datalength;
        }
        else                    /*end of frame also =SOF*/
        {
            cam->ali5603c.SofState = SOF_Start;
            cam->ali5603c.FrameAcquiringOffset = 0;
            return 1;
        }

    }/*end case*/
    return 0;
}


Franck