From: Keith Packard <keithp@keithp.com>
Date: Fri, 1 May 2009 15:14:57 +0000 (-0700)
Subject: USB spec limits bulk endpoints to 64 byte payload max.
X-Git-Tag: 0.2~19
X-Git-Url: https://git.gag.com/?p=fw%2Faltos;a=commitdiff_plain;h=beae3360828da21eb1a3c4f88e930f242d4e36b7

USB spec limits bulk endpoints to 64 byte payload max.

For full-speed devices, bulk endpoints may use 8, 16, 32 or 64 bytes, but no
more.
---

diff --git a/ao_usb.h b/ao_usb.h
index 9356c858..6633dafc 100644
--- a/ao_usb.h
+++ b/ao_usb.h
@@ -68,9 +68,12 @@
 /*
  * Double buffer IN and OUT EPs, so each
  * gets half of the available space
+ *
+ * Ah, but USB bulk packets can only come in 8, 16, 32 and 64
+ * byte sizes, so we'll use 64 for everything
  */
-#define AO_USB_IN_SIZE		256
-#define AO_USB_OUT_SIZE		128
+#define AO_USB_IN_SIZE		64
+#define AO_USB_OUT_SIZE		64
 
 #define AO_USB_EP0_IDLE		0
 #define AO_USB_EP0_DATA_IN	1