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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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11
Projects/AVRISP-MKII/Lib/XPROG/XPROGProtocol.c
View File

@ -124,6 +124,10 @@ static void XPROGProtocol_EnterXPROGMode(void)
XPROGTarget_SendByte(PDI_CMD_STCS | PDI_RESET_REG); XPROGTarget_SendByte(PDI_CMD_STCS | PDI_RESET_REG);
XPROGTarget_SendByte(PDI_RESET_KEY); 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 */ /* Enable access to the XPROG NVM bus by sending the documented NVM access key to the device */
XPROGTarget_SendByte(PDI_CMD_KEY); XPROGTarget_SendByte(PDI_CMD_KEY);
for (uint8_t i = sizeof(PDI_NVMENABLE_KEY); i > 0; i--) for (uint8_t i = sizeof(PDI_NVMENABLE_KEY); i > 0; i--)
@ -134,10 +138,13 @@ static void XPROGProtocol_EnterXPROGMode(void)
} }
else else
{ {
#if 0
/* Enable TPI programming mode with the attached target */ /* Enable TPI programming mode with the attached target */
XPROGTarget_EnableTargetTPI(); 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 */ /* Enable access to the XPROG NVM bus by sending the documented NVM access key to the device */
XPROGTarget_SendByte(TPI_CMD_SKEY); XPROGTarget_SendByte(TPI_CMD_SKEY);
for (uint8_t i = sizeof(TPI_NVMENABLE_KEY); i > 0; i--) 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 */ /* Wait until the NVM bus becomes active */
NVMBusEnabled = TINYNVM_WaitWhileNVMBusBusy(); NVMBusEnabled = TINYNVM_WaitWhileNVMBusBusy();
#endif
NVMBusEnabled = true;
} }
Endpoint_Write_Byte(CMD_XPROG); Endpoint_Write_Byte(CMD_XPROG);

2
Projects/AVRISP-MKII/Lib/XPROG/XPROGTarget.c
View File

@ -420,7 +420,7 @@ static void XPROGTarget_SetRxMode(void)
} }
/* Wait until DATA line has been pulled up to idle by the target */ /* Wait until DATA line has been pulled up to idle by the target */
while (!(BITBANG_PDIDATA_PIN & BITBANG_PDIDATA_MASK)); while (!(BITBANG_PDIDATA_PIN & BITBANG_PDIDATA_MASK) && TimeoutMSRemaining);
#endif #endif
IsSending = false; IsSending = false;

2
Projects/AVRISP-MKII/Lib/XPROG/XPROGTarget.h
View File

@ -81,7 +81,7 @@
#endif #endif
/** Number of cycles between each clock when software USART mode is used */ /** Number of cycles between each clock when software USART mode is used */
#define BITS_BETWEEN_USART_CLOCKS 100 #define BITS_BETWEEN_USART_CLOCKS 200
/** Total number of bits in a single USART frame */ /** Total number of bits in a single USART frame */
#define BITS_IN_USART_FRAME 12 #define BITS_IN_USART_FRAME 12