From 9d988fdc222ad518afa9cfcaaa97b5e8768fd483 Mon Sep 17 00:00:00 2001
From: Dean Camera <dean@fourwalledcubicle.com>
Date: Wed, 20 Mar 2013 19:08:54 +0000
Subject: [PATCH] Make the Mass Storage bootloader compatible with the original
 (green) XPLAIN boards.

---
 Bootloaders/MassStorage/BootloaderMassStorage.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/Bootloaders/MassStorage/BootloaderMassStorage.c b/Bootloaders/MassStorage/BootloaderMassStorage.c
index c891f85160..61f8760f86 100644
--- a/Bootloaders/MassStorage/BootloaderMassStorage.c
+++ b/Bootloaders/MassStorage/BootloaderMassStorage.c
@@ -73,6 +73,21 @@ void Application_Jump_Check(void)
 		PORTC &= ~(1 << 7);
 	#endif
 
+	#if ((BOARD == BOARD_XPLAIN) || (BOARD == BOARD_XPLAIN_REV1))
+		/* Disable JTAG debugging */
+		JTAG_DISABLE();
+
+		/* Enable pull-up on the JTAG TCK pin so we can use it to select the mode */
+		PORTF |= (1 << 4);
+		Delay_MS(10);
+
+		/* If the TCK pin is not jumpered to ground, start the user application instead */
+		JumpToApplication |= ((PINF & (1 << 4)) != 0);
+
+		/* Re-enable JTAG debugging */
+		JTAG_ENABLE();
+	#endif
+
 	if (JumpToApplication)
 	{
 		// cppcheck-suppress constStatement