Reduced guard bit time in the AVRISP project PDI/TPI protocols to reduce the time needed to reverse the data communication direction.

1 files changed, 8 insertions, 3 deletions

diff --git a/Projects/AVRISP-MKII/Lib/XPROG/XPROGProtocol.c b/Projects/AVRISP-MKII/Lib/XPROG/XPROGProtocol.c
index 5275cca8d..1633fb24d 100644
--- a/Projects/AVRISP-MKII/Lib/XPROG/XPROGProtocol.c
+++ b/Projects/AVRISP-MKII/Lib/XPROG/XPROGProtocol.c
@@ -124,6 +124,10 @@ static void XPROGProtocol_EnterXPROGMode(void)
 		XPROGTarget_SendByte(PDI_CMD_STCS | PDI_RESET_REG);	

 		XPROGTarget_SendByte(PDI_RESET_KEY);

 

+		/* Lower direction change guard time to 8 USART bits */

+		XPROGTarget_SendByte(PDI_CMD_STCS | PDI_CTRL_REG);	

+		XPROGTarget_SendByte(0x04);

+

 		/* Enable access to the XPROG NVM bus by sending the documented NVM access key to the device */

 		XPROGTarget_SendByte(PDI_CMD_KEY);	

 		for (uint8_t i = sizeof(PDI_NVMENABLE_KEY); i > 0; i--)

@@ -134,10 +138,13 @@ static void XPROGProtocol_EnterXPROGMode(void)
 	}

 	else

 	{

-	#if 0

 		/* Enable TPI programming mode with the attached target */

 		XPROGTarget_EnableTargetTPI();

 		

+		/* Lower direction change guard time to 8 USART bits */

+		XPROGTarget_SendByte(TPI_CMD_SSTCS | TPI_CTRL_REG);

+		XPROGTarget_SendByte(0x04);		

+		

 		/* Enable access to the XPROG NVM bus by sending the documented NVM access key to the device */

 		XPROGTarget_SendByte(TPI_CMD_SKEY);	

 		for (uint8_t i = sizeof(TPI_NVMENABLE_KEY); i > 0; i--)

@@ -145,8 +152,6 @@ static void XPROGProtocol_EnterXPROGMode(void)
 

 		/* Wait until the NVM bus becomes active */

 		NVMBusEnabled = TINYNVM_WaitWhileNVMBusBusy();

-	#endif

-		NVMBusEnabled = true;

 	}

 	

 	Endpoint_Write_Byte(CMD_XPROG);