From 949591a50d73d5f5e984aba8a79d3c41453d140d Mon Sep 17 00:00:00 2001
From: Tristan Krause <tristan.krause@stud.htwk-leipzig.de>
Date: Mon, 1 Apr 2019 08:37:00 +0200
Subject: [PATCH] block senden stabil

---
 B15F.elf  | Bin 13936 -> 13840 bytes
 B15F.hex  | 388 +++++++++++++++++++++++++++---------------------------
 main.cpp  |   8 ++
 usart.cpp |  50 ++++---
 usart.h   |   1 +
 5 files changed, 229 insertions(+), 218 deletions(-)

diff --git a/B15F.elf b/B15F.elf
index 8a2740a9cae6e06fae14d60d80e72ebece6cc607..25d6b3405875552c593defcca3f296197b19e72f 100644
GIT binary patch
delta 3749
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delta 3831
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diff --git a/B15F.hex b/B15F.hex
index a5a3eae..af2f1a1 100644
--- a/B15F.hex
+++ b/B15F.hex
@@ -1,198 +1,192 @@
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 :00000001FF
diff --git a/main.cpp b/main.cpp
index be8f55f..a1eb489 100644
--- a/main.cpp
+++ b/main.cpp
@@ -108,6 +108,14 @@ int main()
 	_delay_ms(100);
 	beba0.writePortA(0x00);
 
+	uint8_t n = 0;
+	uint8_t block[16];
+	while(1)
+	{
+		beba0.writePortA(n++ & 0xFF);
+		usart.readBlock(&block[0], 0);
+	}
+
 	while(1)
 	{
 		handleRequest();
diff --git a/usart.cpp b/usart.cpp
index 57d8f15..f0b93c7 100644
--- a/usart.cpp
+++ b/usart.cpp
@@ -18,8 +18,12 @@ void USART::init()
 void USART::flush()
 {
 	uint8_t dummy;
-	while (UCSR0A & (1<<RXC0))
+	do
+	{
 		dummy = UDR0;
+		_delay_us((1000000 / BAUDRATE) * 16); // Warte Übertragungszeit von 16 Bit ab
+	}
+	while (UCSR0A & (1<<RXC0));
 
 	if(dummy) // taeusche dummy Verwendung vor
 		return;
@@ -93,30 +97,34 @@ uint16_t USART::readInt()
 void USART::readBlock(uint8_t* ptr, uint8_t offset)
 {
 	ptr += offset;
-	uint8_t crc = 0;
-
-	uint8_t len = readByte();
-	for(uint8_t k = 0; k <= len; k++) // len + 1 Durchgänge (+ crc)
+	uint8_t crc;
+	do
 	{
-		uint8_t next = readByte();
+		crc = 0;
+		uint8_t len = readByte();
+		if(len > MAX_BLOCK_SIZE)
+			len = 0;
 
-		crc ^= next;
-		for (uint8_t i = 0; i < 8; i++)
+		for(uint8_t k = 0; k <= len; k++) // len + 1 Durchgänge (+ crc)
 		{
-			if (crc & 1)
-				crc ^= CRC7_POLY;
-			crc >>= 1;
+			uint8_t next = readByte();
+
+			crc ^= next;
+			for (uint8_t i = 0; i < 8; i++)
+			{
+				if (crc & 1)
+					crc ^= CRC7_POLY;
+				crc >>= 1;
+			}
+
+			if(k < len)
+				ptr[k] = next;
 		}
 
-		if(k < len)
-			ptr[k] = next;
+		
+		flush(); // leere Eingangspuffer
+		
+		writeByte(crc == 0 ? MSG_OK : MSG_FAIL);
 	}
-
-	if(crc == 0)
-	{
-		writeByte(MSG_OK);
-		return;
-	}
-	
-	writeByte(MSG_FAIL);
+	while(crc != 0);
 }
diff --git a/usart.h b/usart.h
index ade6b77..f427f3b 100644
--- a/usart.h
+++ b/usart.h
@@ -7,6 +7,7 @@
 
 constexpr uint32_t BAUDRATE = 115200; // 38400
 constexpr uint8_t  CRC7_POLY = 0x91;
+constexpr uint8_t MAX_BLOCK_SIZE = 16;
 
 class USART
 {