Reduce PDI/TPI reset hold period from 1ms to 100us, as the former caused sporadic session issues.

LUFA/DoxygenPages/ChangeLog.txt

@@ -16,7 +16,7 @@
   *  - Library Applications:
   *   - Refactored out USB interface IDs in the demo applications into enums (thanks to Laszlo Monda)
   *   - AVRISP-MKII Clone Project PDI/TPI frequency increased from 250KHz to 2MHz as it is now stable
-  *   - Increased TPI/PDI handshake delay to 1ms from 1us to support targets with high amounts of capacitance on their
+  *   - Increased TPI/PDI handshake delay to 100us from 1us to support targets with high amounts of capacitance on their
   *     /RESET lines (thanks to Paul Duke)
   *
   *  <b>Fixed:</b>

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

@@ -52,7 +52,7 @@ void XPROGTarget_EnableTargetPDI(void)
 
 	/* Set DATA line high for at least 90ns to disable /RESET functionality */
 	PORTD |= (1 << 3);
-	_delay_ms(1);
+	_delay_us(100);
 
 	/* Set up the synchronous USART for XMEGA communications - 8 data bits, even parity, 2 stop bits */
 	UBRR1  = ((F_CPU / 2 / XPROG_HARDWARE_SPEED) - 1);
@@ -72,7 +72,7 @@ void XPROGTarget_EnableTargetTPI(void)
 	/* Set /RESET line low for at least 400ns to enable TPI functionality */
 	AUX_LINE_DDR  |=  AUX_LINE_MASK;
 	AUX_LINE_PORT &= ~AUX_LINE_MASK;
-	_delay_ms(1);
+	_delay_us(100);
 
 	/* Set Tx and XCK as outputs, Rx as input */
 	DDRD |=  (1 << 5) | (1 << 3);