Fix AVRISP-MKII Clone Programmer PDI entry sequence (thanks to Justin Mattair).

Projects/AVRISP-MKII/Lib/XPROG/XPROGTarget.c

@@ -39,7 +39,7 @@
 #if defined(ENABLE_XPROG_PROTOCOL) || defined(__DOXYGEN__)
 
 /** Flag to indicate if the USART is currently in Tx or Rx mode. */
-bool IsSending;
+static bool IsSending;
 
 /** Enables the target's PDI interface, holding the target in reset until PDI mode is exited. */
 void XPROGTarget_EnableTargetPDI(void)
@@ -50,10 +50,15 @@ void XPROGTarget_EnableTargetPDI(void)
 	DDRD |=  (1 << 5) | (1 << 3);
 	DDRD &= ~(1 << 2);
 
-	/* Set DATA line high for at least 90ns to disable /RESET functionality */
-	PORTD |= (1 << 3);
+	/* Set Tx (PDI CLOCK) high, DATA line low for at least 90ns to disable /RESET functionality */
+	PORTD |=  (1 << 5);
+	PORTD &= ~(1 << 3);
 	_delay_us(100);
 
+	/* Set DATA line high (enables PDI interface after 16 PDI CLK cycles) */
+	PORTD |= (1 << 3);
+	_delay_us(20);
+
 	/* Set up the synchronous USART for XMEGA communications - 8 data bits, even parity, 2 stop bits */
 	UBRR1  = ((F_CPU / 2 / XPROG_HARDWARE_SPEED) - 1);
 	UCSR1B = (1 << TXEN1);