Add even parity bit to the software USART framing in the AVRISP project's PDI programming code.

LUFA/ManPages/ChangeLog.txt

@@ -39,6 +39,8 @@
   *    with the rest of the library errorcodes
   *  - Make MIDI device demos also turn off the on board LEDs if MIDI Note On messages are sent with a velocity of zero,
   *    which some devices use instead of Note Off messages (thanks to Robin Green)
+  *  - The CDC demos are now named "VirtualSerial" instead to indicate the demos' function rather than its implemented USB class,
+  *    to reduce confusion and to be in line with the rest of the LUFA demos
   *
   *  <b>Fixed:</b>
   *  - Added missing CDC_Host_CreateBlockingStream() function code to the CDC Host Class driver
@@ -56,7 +58,7 @@
   *  - Fixed TeensyHID bootloader not properly shutting down the USB interface to trigger a disconnection on the host before resetting
   *  - Fixed MassStorageHost Class driver demo not having USB_STREAM_TIMEOUT_MS compile time option set properly to prevent slow 
   *    devices from timing out the data pipes
-  *  - Fixed the definition of the Endpoint_BytesInEndpoint() macro for the U4 parts
+  *  - Fixed the definition of the Endpoint_BytesInEndpoint() macro for the U4 series AVR parts
   *
   *  \section Sec_ChangeLog091122 Version 091122
   *

Projects/AVRISP/Lib/PDITarget.c

@@ -45,22 +45,40 @@
  */
 void PDITarget_SendByte(uint8_t Byte)
 {
+	uint8_t LogicOneBits = 0;
+
+	// One Start Bit
 	PDIDATA_LINE_PORT &= ~PDIDATA_LINE_MASK;
 
 	TOGGLE_PDI_CLOCK;
 	
+	// Eight Data Bits
 	for (uint8_t i = 0; i < 8; i++)
 	{
 		if (Byte & 0x01)
+		{
 			PDIDATA_LINE_PORT &= ~PDIDATA_LINE_MASK;
+			LogicOneBits++;
+		}
 		else
+		{
 			PDIDATA_LINE_PORT |=  PDIDATA_LINE_MASK;
+		}
 		
 		Byte >>= 1;
 
 		TOGGLE_PDI_CLOCK;
 	}
 
+	// Even Parity Bit
+	if (LogicOneBits & 0x01)
+	  PDIDATA_LINE_PORT &= ~PDIDATA_LINE_MASK;
+	else
+	  PDIDATA_LINE_PORT |=  PDIDATA_LINE_MASK;
+
+	TOGGLE_PDI_CLOCK;
+
+	// Two Stop Bits
 	PDIDATA_LINE_PORT |= PDIDATA_LINE_MASK;
 	
 	TOGGLE_PDI_CLOCK;
@@ -77,9 +95,11 @@ uint8_t PDITarget_ReceiveByte(void)
 
 	PDIDATA_LINE_DDR &= ~PDIDATA_LINE_MASK;
 
+	// One Start Bit
 	while (PDIDATA_LINE_PIN & PDIDATA_LINE_MASK);
 	  TOGGLE_PDI_CLOCK;
 		
+	// Eight Data Bits
 	for (uint8_t i = 0; i < 8; i++)
 	{
 		if (PDIDATA_LINE_PIN & PDIDATA_LINE_MASK)
@@ -90,6 +110,10 @@ uint8_t PDITarget_ReceiveByte(void)
 		TOGGLE_PDI_CLOCK;	
 	}
 
+	// Even Parity Bit (discarded)
+	TOGGLE_PDI_CLOCK;
+
+	// Two Stop Bits
 	TOGGLE_PDI_CLOCK;
 	TOGGLE_PDI_CLOCK;