Make WaitWhileBusy function in the AVRISP project more explicit about how it sends and receives the busy check command.

Reduce size of PROGRAM FLASH ISP or PROGRAM EEPROM ISP buffer to 256 bytes to prevent blowing the stack on the smallest USB AVR models.

Projects/AVRISP/Lib/V2Protocol.c

@@ -301,7 +301,7 @@ static void V2Protocol_Command_ProgramMemory(uint8_t V2Command)
 		uint8_t  ProgrammingCommands[3];
 		uint8_t  PollValue1;
 		uint8_t  PollValue2;
-		uint8_t  ProgData[512];
+		uint8_t  ProgData[256];
 	} Write_Memory_Params;
 	
 	uint8_t* NextWriteByte = Write_Memory_Params.ProgData;

Projects/AVRISP/Lib/V2ProtocolTarget.c

@@ -161,8 +161,9 @@ uint8_t V2Protocol_WaitWhileTargetBusy(void)
 		SPI_SendByte(0x00);
 
 		SPI_SendByte(0x00);
+		bool DeviceBusy = (SPI_ReceiveByte() & 0x01);
 	}
-	while ((SPI_ReceiveByte() & 0x01) && (TCNT0 < TARGET_BUSY_TIMEOUT_MS));
+	while (DeviceBusy && (TCNT0 < TARGET_BUSY_TIMEOUT_MS));
 
 	if (TCNT0 >= TARGET_BUSY_TIMEOUT_MS)
 	  return STATUS_RDY_BSY_TOUT;