From 9a1560dc050f79fd189838a87ce623e79ff48677 Mon Sep 17 00:00:00 2001
From: Dean Camera <dean@fourwalledcubicle.com>
Date: Fri, 30 Apr 2010 08:33:21 +0000
Subject: [PATCH] Make sure that long reads are aborted early if the connection
 times out while waiting on more bytes in the AVRISP MKII clone project.

---
 Projects/AVRISP-MKII/Lib/XPROG/TINYNVM.c     | 4 ++--
 Projects/AVRISP-MKII/Lib/XPROG/XMEGANVM.c    | 6 +++---
 Projects/AVRISP-MKII/Lib/XPROG/XPROGTarget.c | 3 +++
 3 files changed, 8 insertions(+), 5 deletions(-)

diff --git a/Projects/AVRISP-MKII/Lib/XPROG/TINYNVM.c b/Projects/AVRISP-MKII/Lib/XPROG/TINYNVM.c
index 7b9ff09148..acd6b651cc 100644
--- a/Projects/AVRISP-MKII/Lib/XPROG/TINYNVM.c
+++ b/Projects/AVRISP-MKII/Lib/XPROG/TINYNVM.c
@@ -164,14 +164,14 @@ bool TINYNVM_ReadMemory(const uint16_t ReadAddress, uint8_t* ReadBuffer, uint16_
 	/* Send the address of the location to read from */
 	TINYNVM_SendPointerAddress(ReadAddress);
 	
-	while (ReadSize--)
+	while (ReadSize-- && TimeoutMSRemaining)
 	{
 		/* Read the byte of data from the target */
 		XPROGTarget_SendByte(TPI_CMD_SLD | TPI_POINTER_INDIRECT_PI);
 		*(ReadBuffer++) = XPROGTarget_ReceiveByte();
 	}
 	
-	return true;
+	return (TimeoutMSRemaining != 0);
 }
 
 /** Writes word addressed memory to the target's memory spaces.
diff --git a/Projects/AVRISP-MKII/Lib/XPROG/XMEGANVM.c b/Projects/AVRISP-MKII/Lib/XPROG/XMEGANVM.c
index 7ca0c5e8a9..b6b039aa80 100644
--- a/Projects/AVRISP-MKII/Lib/XPROG/XMEGANVM.c
+++ b/Projects/AVRISP-MKII/Lib/XPROG/XMEGANVM.c
@@ -183,7 +183,7 @@ bool XMEGANVM_GetMemoryCRC(const uint8_t CRCCommand, uint32_t* const CRCDest)
 	for (uint8_t i = 0; i < XMEGA_CRC_LENGTH; i++)
 	  ((uint8_t*)CRCDest)[i] = XPROGTarget_ReceiveByte();
 	
-	return true;
+	return (TimeoutMSRemaining != 0);
 }
 
 /** Reads memory from the target's memory spaces.
@@ -215,10 +215,10 @@ bool XMEGANVM_ReadMemory(const uint32_t ReadAddress, uint8_t* ReadBuffer, uint16
 		
 	/* Send a LD command with indirect access and postincrement to read out the bytes */
 	XPROGTarget_SendByte(PDI_CMD_LD | (PDI_POINTER_INDIRECT_PI << 2) | PDI_DATSIZE_1BYTE);
-	while (ReadSize--)
+	while (ReadSize-- && TimeoutMSRemaining)
 	  *(ReadBuffer++) = XPROGTarget_ReceiveByte();
 	
-	return true;
+	return (TimeoutMSRemaining != 0);
 }
 
 /** Writes byte addressed memory to the target's memory spaces.
diff --git a/Projects/AVRISP-MKII/Lib/XPROG/XPROGTarget.c b/Projects/AVRISP-MKII/Lib/XPROG/XPROGTarget.c
index 6f0d87add6..e75adbe101 100644
--- a/Projects/AVRISP-MKII/Lib/XPROG/XPROGTarget.c
+++ b/Projects/AVRISP-MKII/Lib/XPROG/XPROGTarget.c
@@ -338,6 +338,9 @@ uint8_t XPROGTarget_ReceiveByte(void)
 		}	
 	}
 	
+	if (TimeoutMSRemaining)
+	  TimeoutMSRemaining = COMMAND_TIMEOUT_MS;
+
 	return UDR1;
 #else
 	/* Wait until a byte has been received before reading */