From 27461546523862a3a76ee41f615f7ec2eed2195f Mon Sep 17 00:00:00 2001
From: Dean Camera <dean@fourwalledcubicle.com>
Date: Tue, 19 Jan 2010 00:25:26 +0000
Subject: Added master mode hardware TWI driver.

Fixed a bug in the incomplete Webserver project, where the packet data was not being written to and read from the correct buffer address.
---
 LUFA/Drivers/Peripheral/AVRU4U6U7/TWI.c | 54 +++++++++++++++++++++++++++++++++
 1 file changed, 54 insertions(+)
 create mode 100644 LUFA/Drivers/Peripheral/AVRU4U6U7/TWI.c

(limited to 'LUFA/Drivers/Peripheral/AVRU4U6U7/TWI.c')

diff --git a/LUFA/Drivers/Peripheral/AVRU4U6U7/TWI.c b/LUFA/Drivers/Peripheral/AVRU4U6U7/TWI.c
new file mode 100644
index 000000000..6028bbae9
--- /dev/null
+++ b/LUFA/Drivers/Peripheral/AVRU4U6U7/TWI.c
@@ -0,0 +1,54 @@
+/*
+     Copyright (C) Dean Camera, 2010.
+              
+  dean [at] fourwalledcubicle [dot] com
+      www.fourwalledcubicle.com
+*/
+
+#include "TWI.h"
+
+bool TWI_StartTransmission(uint8_t SlaveAddress)
+{
+	for (;;)
+	{
+		uint8_t IterationsRemaining = 50;
+		bool    BusCaptured = false;
+
+		while (IterationsRemaining-- && !BusCaptured)
+		{
+			TWCR = ((1 << TWINT) | (1 << TWSTA) | (1 << TWEN));	
+			while (!(TWCR & (1 << TWINT)));
+				
+			switch (TWSR & TW_STATUS_MASK)
+			{
+				case TW_START:
+				case TW_REP_START:
+					BusCaptured = true;
+					break;
+				case TW_MT_ARB_LOST:
+					continue;
+				default:
+					return false;
+			}
+		}
+		
+		if (!(BusCaptured))
+		  return false;
+		  
+		TWDR = SlaveAddress;
+		TWCR = ((1 << TWINT) | (1 << TWEN));
+		while (!(TWCR & (1 << TWINT)));
+		
+		GPIOR0 = (TWSR & TW_STATUS_MASK);
+
+		switch (TWSR & TW_STATUS_MASK)
+		{
+			case TW_MT_SLA_ACK:
+			case TW_MR_SLA_ACK:
+				return true;
+			default:
+				TWI_StopTransmission();
+				break;
+		}		  
+	}
+}
-- 
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