On Tuesday 29 Jun 2010 10:15:43 pm Ray Lehtiniemi wrote:
> On 10-06-29 09:40 AM, Kunal Gangakhedkar wrote:
> > For starters, you can take a look at Ray's repo at:
> > http://github.com/rayl/vfs101driver
> >
> > This is not an fprint driver, but a set of tools he's working on to simulate
> > the protocol for the device.
> >
> just as a quick status update, the current code is able to configure
> the device, enter a polling loop, and retrieve a single fingerprint into
> a PNM file. for some reason the hardware seems to lock up at this
> point. once this lockup problem is solved, i think it will be fairly
> easy (for someone who understands the fprint state machine model) to
> take this code and produce an actual fprint driver.
>
If you're talking about the lock up in load() while reading the fingerprint,
then
it's due to small buffer - I increased it to 4M instead of 1M and the program
ran to completion for me.
You can try the attached patch.
Kunal
> so if you're willing and able, please try out the code, try to reproduce
> the lockup, and see if you can figure out why it's happening :-)
>
> thanks
> ray
>
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diff --git a/src/proto.c b/src/proto.c
index d81da64..e008add 100644
--- a/src/proto.c
+++ b/src/proto.c
@@ -24,6 +24,13 @@
#include <stdlib.h>
#include <libusb-1.0/libusb.h>
+#define DEBUG
+
+#ifdef DEBUG
+#define dbg(fmt...) fprintf(stderr, "VFS DBG: " fmt)
+#else
+#define dbg(fmt...)
+#endif
/* The device seems to send back 16 frames of 292 bytes at a time */
const unsigned int FRAME_SIZE = 292;
@@ -31,6 +38,7 @@ const unsigned int N_FRAMES = 16;
#define nitems(x) (sizeof(x)/sizeof(x[0]))
+#define BUF_SIZE (4 * 1024 * 1024) // 4MB buffer
/******************************************************************************************************
* Context structure for this driver.
@@ -55,7 +63,7 @@ struct vfs_dev {
int len;
/* buffer to hold raw image data frames */
- unsigned char ibuf[1024*1024];
+ unsigned char ibuf[BUF_SIZE];
int ilen;
int inum;
@@ -130,7 +138,7 @@ static void dev_open (struct vfs_dev *dev)
}
dev->state = 1;
- dev->devh = libusb_open_device_with_vid_pid(NULL, 0x138a, 0x0001);
+ dev->devh = libusb_open_device_with_vid_pid(dev->ctx, 0x138a, 0x0001);
if (dev->devh == NULL) {
fprintf(stderr, "Can't open validity device!\n");
return;
@@ -581,12 +589,15 @@ static int recv(struct vfs_dev *dev)
static int load (struct vfs_dev *dev, unsigned char *buf, int *len)
{
int n;
+ int try = 0;
*len = 0;
do {
+ dbg("beginning of the loop..\n");
int r = libusb_bulk_transfer(dev->devh, EP_IN(2), buf, N_FRAMES*FRAME_SIZE, &n, BULK_TIMEOUT);
+ dbg("%s: r=%d, n=%d, try=%d\n", __FUNCTION__, r, n, try++);
buf += n;
*len += n;
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