ISP1761 USB driver

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originally posted by dms2002711@Aug 17 2006, 10:47 PM

hi,hippo

do you know the possible reasons of the following phenomenon:

(a uclinux system had trasplanted into the board de2 successful,and the usb camera can work)

i was programming for grabbling picture via video4liux api which was used for usb camer.

i can obtain the camera and the picture information using ioctl() function:

fd=open("dev/v4l/video0",o_rdwr);

...........

int cap=ioctl(fd,vidiocgcap,& capability);

..........

int pic=ioctl(fd,vidiocgpict,& picture);

return value:

fd=3;

cap=0;

pic=0;

above code could work ,and the correct information was obtained.

but when used the following code ,a problem was generated

struct video_mbuf mbuf;

...........

struct video_mmap grab_buf;

grab_buf.frame=0;

grab_buf.height=240;

grab_buf.width=320;

grab_buf.format=video_palette_rgb24;

char *data;

data=mmap(0,mbuf.size,prot_read|prot_write,map_shared,fd,0);

..................

int grab=ioctl(fd,vidiocmcapture,&grab_buf);

.................

int sync=ioctl(fd,vidiocsync,& grab_buf.frame);

.............

the return value:

data=-1

grab=-1;

sync=-1

that's to say ,the process of grabbing a frame_picture work failed!

do you know the possible reasons!

the isp1362 driver did not suppot the isochronous ,i have modified the parameter of the isp1362 driver,now, there wasn't the note:isochronous transfer not supportec.

look forward to you reply! thank you !

<div align='right'><{post_snapback}> (index.php?act=findpost&pid=17693)

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What is errno for each of your errors? Knowing this will, at least, tell you what&#39;s failing in each of your commands, which is a pretty good place to start.

Cheers,

- slacker