Added new XCK_RESCUE_CLOCK_ENABLE compile time option to the AVRISP-MKII clone programmer project (thanks to Tom Light).

3 files changed, 26 insertions, 12 deletions

diff --git a/Projects/AVRISP-MKII/Lib/ISP/ISPTarget.c b/Projects/AVRISP-MKII/Lib/ISP/ISPTarget.c
index 66a1c2560..657c2c999 100644
--- a/Projects/AVRISP-MKII/Lib/ISP/ISPTarget.c
+++ b/Projects/AVRISP-MKII/Lib/ISP/ISPTarget.c
@@ -189,19 +189,29 @@ void ISPTarget_DisableTargetISP(void)
  */
 void ISPTarget_ConfigureRescueClock(void)
 {
-	/* Configure OCR1A as an output for the specified AVR model */
-	#if defined(USB_SERIES_2_AVR)
-	DDRC |= (1 << 6);
+	#if defined(XCK_RESCUE_CLOCK_ENABLE)
+		/* Configure XCK as an output for the specified AVR model */
+		DDRD  |= (1 << 5);
+		
+		/* Start USART to generate a 4MHz clock on the XCK pin */
+		UBRR1  = ((F_CPU / 2 / ISP_RESCUE_CLOCK_SPEED) - 1);
+		UCSR1B = (1 << TXEN1);
+		UCSR1C = (1 << UMSEL10) | (1 << UPM11) | (1 << USBS1) | (1 << UCSZ11) | (1 << UCSZ10) | (1 << UCPOL1);
 	#else
-	DDRB |= (1 << 5);
+		/* Configure OCR1A as an output for the specified AVR model */
+		#if defined(USB_SERIES_2_AVR)
+		DDRC |= (1 << 6);
+		#else
+		DDRB |= (1 << 5);
+		#endif
+
+		/* Start Timer 1 to generate a 4MHz clock on the OCR1A pin */
+		TIMSK1 = 0;
+		TCNT1  = 0;
+		OCR1A  = ((F_CPU / 2 / ISP_RESCUE_CLOCK_SPEED) - 1);
+		TCCR1A = (1 << COM1A0);
+		TCCR1B = ((1 << WGM12) | (1 << CS10));
 	#endif
-
-	/* Start Timer 1 to generate a 4MHz clock on the OCR1A pin */
-	TIMSK1 = 0;
-	TCNT1  = 0;
-	OCR1A  = ((F_CPU / 2 / ISP_RESCUE_CLOCK_SPEED) - 1);
-	TCCR1A = (1 << COM1A0);
-	TCCR1B = ((1 << WGM12) | (1 << CS10));
 }
 
 /** Configures the AVR's timer ready to produce software ISP for the slower ISP speeds that
diff --git a/Projects/AVRISP-MKII/Lib/XPROG/XPROGProtocol.c b/Projects/AVRISP-MKII/Lib/XPROG/XPROGProtocol.c
index 02fbbf44d..276f63e0e 100644
--- a/Projects/AVRISP-MKII/Lib/XPROG/XPROGProtocol.c
+++ b/Projects/AVRISP-MKII/Lib/XPROG/XPROGProtocol.c
@@ -196,6 +196,10 @@ static void XPROGProtocol_LeaveXPROGMode(void)
 		XPROGTarget_DisableTargetTPI();
 	}
 
+	#if defined(XCK_RESCUE_CLOCK_ENABLE) && defined(ENABLE_ISP_PROTOCOL)
+	ISPTarget_ConfigureRescueClock();
+	#endif
+
 	Endpoint_Write_Byte(CMD_XPROG);
 	Endpoint_Write_Byte(XPRG_CMD_LEAVE_PROGMODE);
 	Endpoint_Write_Byte(XPRG_ERR_OK);
diff --git a/Projects/AVRISP-MKII/Lib/XPROG/XPROGTarget.c b/Projects/AVRISP-MKII/Lib/XPROG/XPROGTarget.c
index 8760e62cb..f6fff1cf7 100644
--- a/Projects/AVRISP-MKII/Lib/XPROG/XPROGTarget.c
+++ b/Projects/AVRISP-MKII/Lib/XPROG/XPROGTarget.c
@@ -118,7 +118,7 @@ void XPROGTarget_DisableTargetTPI(void)
 	/* Set all USART lines as input, tristate */
 	DDRD  &= ~((1 << 5) | (1 << 3));
 	PORTD &= ~((1 << 5) | (1 << 3) | (1 << 2));
-
+	
 	/* Tristate target /RESET line */
 	AUX_LINE_DDR  &= ~AUX_LINE_MASK;
 	AUX_LINE_PORT &= ~AUX_LINE_MASK;