X-Git-Url: http://git.linex4red.de/pub/USBasp.git/blobdiff_plain/35a0fe93848cc6e1a79d2e606a2e3f6a84ba5755..ab195ab1da1da75a3a23d47b56c66d14803a9de3:/Projects/AVRISP-MKII/Lib/ISP/ISPProtocol.c

diff --git a/Projects/AVRISP-MKII/Lib/ISP/ISPProtocol.c b/Projects/AVRISP-MKII/Lib/ISP/ISPProtocol.c
index 33ccbf91e..e0eb44107 100644
--- a/Projects/AVRISP-MKII/Lib/ISP/ISPProtocol.c
+++ b/Projects/AVRISP-MKII/Lib/ISP/ISPProtocol.c
@@ -62,7 +62,14 @@ void ISPProtocol_EnterISPMode(void)
 	uint8_t ResponseStatus = STATUS_CMD_FAILED;
 	
 	CurrentAddress = 0;
+	
+	/* Set up the synchronous USART to generate the recovery clock on XCK pin */
+	UBRR1  = (F_CPU / 500000UL);
+	UCSR1B = (1 << TXEN1);
+	UCSR1C = (1 << UMSEL10) | (1 << UPM11) | (1 << USBS1) | (1 << UCSZ11) | (1 << UCSZ10) | (1 << UCPOL1);
+	DDRD  |= (1 << 5);
 
+	/* Perform execution delay, initialize SPI bus */
 	ISPProtocol_DelayMS(Enter_ISP_Params.ExecutionDelayMS); 
 	SPI_Init(ISPTarget_GetSPIPrescalerMask() | SPI_SCK_LEAD_RISING | SPI_SAMPLE_LEADING | SPI_MODE_MASTER);
 
@@ -118,6 +125,12 @@ void ISPProtocol_LeaveISPMode(void)
 	SPI_ShutDown();
 	ISPProtocol_DelayMS(Leave_ISP_Params.PostDelayMS);
 
+	/* Turn off the synchronous USART to terminate the recovery clock on XCK pin */
+	UBRR1  = (F_CPU / 500000UL);
+	UCSR1B = (1 << TXEN1);
+	UCSR1C = (1 << UMSEL10) | (1 << UPM11) | (1 << USBS1) | (1 << UCSZ11) | (1 << UCSZ10) | (1 << UCPOL1);
+	DDRD  &= ~(1 << 5);
+
 	Endpoint_Write_Byte(CMD_LEAVE_PROGMODE_ISP);
 	Endpoint_Write_Byte(STATUS_CMD_OK);
 	Endpoint_ClearIN();