From: Dean Camera <dean@fourwalledcubicle.com>
Date: Sun, 12 Aug 2012 13:46:24 +0000 (+0000)
Subject: Added workaround for broken VBUS detection on AVR8 devices when a bootloader starts... 
X-Git-Tag: LUFA-130303~89
X-Git-Url: http://git.linex4red.de/pub/USBasp.git/commitdiff_plain/ffbb30e0f86a774e6bfd866db36254fc7c8926d8?ds=sidebyside

Added workaround for broken VBUS detection on AVR8 devices when a bootloader starts the application via a software jump without first turning off the OTG pad (thanks to Simon Inns)
---

diff --git a/LUFA/DoxygenPages/ChangeLog.txt b/LUFA/DoxygenPages/ChangeLog.txt
index ed0e9e8df..4f361c5f7 100644
--- a/LUFA/DoxygenPages/ChangeLog.txt
+++ b/LUFA/DoxygenPages/ChangeLog.txt
@@ -15,7 +15,8 @@
   *
   *  <b>Changed:</b>
   *  - Core:
-  *   - <i>None</i>
+  *   - Added workaround for broken VBUS detection on AVR8 devices when a bootloader starts the application
+  *     via a software jump without first turning off the OTG pad (thanks to Simon Inns)
   *  - Library Applications:
   *   - <i>None</i>
   *
diff --git a/LUFA/Drivers/USB/Core/AVR8/USBController_AVR8.c b/LUFA/Drivers/USB/Core/AVR8/USBController_AVR8.c
index 1f37dfd49..8285f7e92 100644
--- a/LUFA/Drivers/USB/Core/AVR8/USBController_AVR8.c
+++ b/LUFA/Drivers/USB/Core/AVR8/USBController_AVR8.c
@@ -63,6 +63,13 @@ void USB_Init(
 	USB_Options = Options;
 	#endif
 
+	#if defined(USB_SERIES_4_AVR) || defined(USB_SERIES_6_AVR) || defined(USB_SERIES_7_AVR)
+	/* Workaround for AVR8 bootloaders that fail to turn off the OTG pad before running
+	 * the loaded application. This causes VBUS detection to fail unless we first force
+	 * it off to reset it. */
+	USB_OTGPAD_Off();
+	#endif
+
 	if (!(USB_Options & USB_OPT_REG_DISABLED))
 	  USB_REG_On();
 	else