Fixed AVRISP-MKII Clone failing to start application firmware once a TPI programming session is exited.

LUFA/DoxygenPages/ChangeLog.txt

@@ -39,6 +39,7 @@
   *  - Library Applications:
   *   - Added reliability patches to the AVRISP-MKII Clone project's PDI/TPI protocols (thanks to Justin Mattair)
   *   - Fixed AVRISP-MKII Clone compile warning on AVR8 U4 targets even when NO_VTARGET_DETECT is enabled
+  *   - Fixed AVRISP-MKII Clone failing to start application firmware once a TPI programming session is exited
   *
   *  \section Sec_ChangeLog111009 Version 111009
   *  <b>New:</b>

Projects/AVRISP-MKII/Lib/XPROG/TINYNVM.c

@@ -146,9 +146,15 @@ void TINYNVM_DisableTPI(void)
 {
 	TINYNVM_WaitWhileNVMBusBusy();
 
-	/* Clear the NVMEN bit in the TPI STATUS register to disable TPI mode */
-	XPROGTarget_SendByte(TPI_CMD_SSTCS | TPI_STATUS_REG);
-	XPROGTarget_SendByte(0x00);
+	do
+	{
+		/* Clear the NVMEN bit in the TPI STATUS register to disable TPI mode */
+		XPROGTarget_SendByte(TPI_CMD_SSTCS | TPI_STATUS_REG);
+		XPROGTarget_SendByte(0x00);
+	
+		/* Read back the STATUS register, check to see if it took effect */
+		XPROGTarget_SendByte(TPI_CMD_SLDCS | PDI_RESET_REG);
+	} while (XPROGTarget_ReceiveByte() != 0x00);
 
 	XPROGTarget_DisableTargetTPI();
 }