Changeset 2364

Timestamp:

Jul 14, 2011 9:32:36 AM (23 months ago)

Author:

wmb

Message:

OLPC XO-1.75 - Double-probe the USB the first time with a little delay in-between, thus giving devices behind the hub a bit of wakeup time. In particular, this helps with USB barcode scanners.

File:

• cpu/arm/olpc/1.75/usb.fth (modified) (1 diff)

cpu/arm/olpc/1.75/usb.fth

@@ -54 +54 @@
 ;
 
+true value first-usb-probe?
+: (silent-probe-usb)  ( -- )  " /" ['] (probe-usb2) scan-subtree  ;
 : silent-probe-usb  ( -- )
-   " /" ['] (probe-usb2) scan-subtree
+   (silent-probe-usb)
    report-disk report-net report-keyboard
 ;
 : probe-usb  ( -- )
+   first-usb-probe?  if
+      false to first-usb-probe?
+      \ Initial probe to awaken the hub
+      (silent-probe-usb)
+      \ A little delay to let slow devices like USB scanner wake up
+      d# 150 ms
+   then
    silent-probe-usb