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

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This commit is contained in:
Dean Camera
2009-12-29 14:54:52 +00:00
parent b1dbd92c32
commit f5951d1593
3 changed files with 10 additions and 5 deletions
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Projects/AVRISP-MKII/Lib/XPROG/XPROGProtocol.c
+8 -3
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@@ -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);