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changeset 7:9a14029b3782

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- Wait longer (100msec) for a read, and reduce the number of retries to match. - Print out if we read OK after more than 1 attempt for diagnostic purposes.
author Daniel O'Connor <darius@dons.net.au>
date Thu, 11 Feb 2010 12:47:59 +1030
parents e0b32014ed14
children e3d2b5500b53
files wh1080.c
diffstat 1 files changed, 6 insertions(+), 10 deletions(-) [+]
line wrap: on
line diff
--- a/wh1080.c	Thu Feb 11 12:45:22 2010 +1030
+++ b/wh1080.c	Thu Feb 11 12:47:59 2010 +1030
@@ -230,7 +230,7 @@
  */
 int read_station (char *buf)
 {
-#define MAXTRIES 100
+#define MAXTRIES 10
   int bytes_read, i = 0;
 
   /* XXX Find out what all this means, and be cleverer about retries */
@@ -240,22 +240,20 @@
                                           USB_ENDPOINT_IN | USB_RECIP_INTERFACE,
                                           buf,
                                           8,
-                                          10 )) == 8 ){
-      if (i > 5)
+                                          100 )) == 8 ){
+      if (i > 0)
         fprintf(stderr, "Read OK after %d tries\n", i + 1);
       return bytes_read;
     }
-    
-    if (errno == EAGAIN)
-      usleep (10000);
+    fprintf(stderr, "Retrying..\n");
+
+    usleep (10000);
     i++;
   }
   while (errno != EINTR && i < MAXTRIES);
   if (i == MAXTRIES) {
-#if 0
     fprintf(stderr,
 	    "Can't read from device after %d attempts\n", MAXTRIES);
-#endif
   } else
     fprintf (stderr,
 	     "Can't read device: %s (%d)\n",
@@ -293,9 +291,7 @@
   
   while (bytes_read < 32) {
     if ((i = read_station ((char *) &buf [bytes_read])) == 0) {
-#if 0
       fprintf(stderr, "Couldn't read from the device, rerequesting\n");
-#endif
       goto rerequest;
     }