X-Git-Url: http://git.linex4red.de/pub/USBasp.git/blobdiff_plain/ab195ab1da1da75a3a23d47b56c66d14803a9de3..a9e0935a90346beb0c981924becc1f55d969a08b:/Projects/AVRISP-MKII/Lib/XPROG/XMEGANVM.c?ds=sidebyside

diff --git a/Projects/AVRISP-MKII/Lib/XPROG/XMEGANVM.c b/Projects/AVRISP-MKII/Lib/XPROG/XMEGANVM.c
index fc98cfceb..1671d29ba 100644
--- a/Projects/AVRISP-MKII/Lib/XPROG/XMEGANVM.c
+++ b/Projects/AVRISP-MKII/Lib/XPROG/XMEGANVM.c
@@ -76,7 +76,15 @@ bool XMEGANVM_WaitWhileNVMBusBusy(void)
 	{
 		/* Send the LDCS command to read the PDI STATUS register to see the NVM bus is active */
 		XPROGTarget_SendByte(PDI_CMD_LDCS | PDI_STATUS_REG);
-		if (XPROGTarget_ReceiveByte() & PDI_STATUS_NVM)
+		
+		uint8_t StatusRegister = XPROGTarget_ReceiveByte();
+		
+		/* We might have timed out waiting for the status register read response, check here */
+		if (!(TimeoutMSRemaining))
+		  return false;
+		
+		/* Check the status register read response to see if the NVM bus is enabled */
+		if (StatusRegister & PDI_STATUS_NVM)
 		{
 			TimeoutMSRemaining = COMMAND_TIMEOUT_MS;
 			return true;
@@ -100,8 +108,14 @@ bool XMEGANVM_WaitWhileNVMControllerBusy(void)
 		XPROGTarget_SendByte(PDI_CMD_LDS | (PDI_DATSIZE_4BYTES << 2));
 		XMEGANVM_SendNVMRegAddress(XMEGA_NVM_REG_STATUS);
 		
+		uint8_t StatusRegister = XPROGTarget_ReceiveByte();
+
+		/* We might have timed out waiting for the status register read response, check here */
+		if (!(TimeoutMSRemaining))
+		  return false;
+
 		/* Check to see if the BUSY flag is still set */
-		if (!(XPROGTarget_ReceiveByte() & (1 << 7)))
+		if (!(StatusRegister & (1 << 7)))
 		{
 			TimeoutMSRemaining = COMMAND_TIMEOUT_MS;
 			return true;
@@ -155,7 +169,7 @@ 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.
@@ -187,10 +201,10 @@ 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.