From f5951d15936f397afbeb31bf467a90e6e9b5e161 Mon Sep 17 00:00:00 2001 From: Dean Camera Date: Tue, 29 Dec 2009 14:54:52 +0000 Subject: Reduced guard bit time in the AVRISP project PDI/TPI protocols to reduce the time needed to reverse the data communication direction. --- Projects/AVRISP-MKII/Lib/XPROG/XPROGProtocol.c | 11 ++++++++--- 1 file changed, 8 insertions(+), 3 deletions(-) (limited to 'Projects/AVRISP-MKII/Lib/XPROG/XPROGProtocol.c') 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); -- cgit v1.2.3