Reduced guard bit time in the AVRISP project PDI/TPI protocols to reduce the time...

[pub/USBasp.git] / 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 5275cca..1633fb2 100644 (file)
--- 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);     \r
                XPROGTarget_SendByte(PDI_RESET_KEY);\r
 \r
+               /* Lower direction change guard time to 8 USART bits */\r
+               XPROGTarget_SendByte(PDI_CMD_STCS | PDI_CTRL_REG);      \r
+               XPROGTarget_SendByte(0x04);\r
+\r
                /* Enable access to the XPROG NVM bus by sending the documented NVM access key to the device */\r
                XPROGTarget_SendByte(PDI_CMD_KEY);      \r
                for (uint8_t i = sizeof(PDI_NVMENABLE_KEY); i > 0; i--)\r
@@ -134,10 +138,13 @@ static void XPROGProtocol_EnterXPROGMode(void)
        }\r
        else\r
        {\r
-       #if 0\r
                /* Enable TPI programming mode with the attached target */\r
                XPROGTarget_EnableTargetTPI();\r
                \r
+               /* Lower direction change guard time to 8 USART bits */\r
+               XPROGTarget_SendByte(TPI_CMD_SSTCS | TPI_CTRL_REG);\r
+               XPROGTarget_SendByte(0x04);             \r
+               \r
                /* Enable access to the XPROG NVM bus by sending the documented NVM access key to the device */\r
                XPROGTarget_SendByte(TPI_CMD_SKEY);     \r
                for (uint8_t i = sizeof(TPI_NVMENABLE_KEY); i > 0; i--)\r
@@ -145,8 +152,6 @@ static void XPROGProtocol_EnterXPROGMode(void)
 \r
                /* Wait until the NVM bus becomes active */\r
                NVMBusEnabled = TINYNVM_WaitWhileNVMBusBusy();\r
-       #endif\r
-               NVMBusEnabled = true;\r
        }\r
        \r
        Endpoint_Write_Byte(CMD_XPROG);\r