X-Git-Url: http://git.linex4red.de/pub/USBasp.git/blobdiff_plain/88bcc6fde546f12a31f46b5c8b77631b0c648638..c757acf1f7f3f45522024af7adf8df71a42a1dc1:/Bootloaders/MassStorage/BootloaderMassStorage.c

diff --git a/Bootloaders/MassStorage/BootloaderMassStorage.c b/Bootloaders/MassStorage/BootloaderMassStorage.c
index c891f8516..28f42b6d2 100644
--- a/Bootloaders/MassStorage/BootloaderMassStorage.c
+++ b/Bootloaders/MassStorage/BootloaderMassStorage.c
@@ -69,8 +69,25 @@ void Application_Jump_Check(void)
 		/* Enable pull-up on the IO13 pin so we can use it to select the mode */
 		PORTC |=  (1 << 7);
 		Delay_MS(10);
+
+		/* If IO13 is not jumpered to ground, start the user application instead */
 		JumpToApplication |= ((PINC & (1 << 7)) != 0);
+
+		/* Disable pull-up after the check has completed */
 		PORTC &= ~(1 << 7);
+	#elif ((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)