/*
LUFA Library
- Copyright (C) Dean Camera, 2010.
-
+ Copyright (C) Dean Camera, 2012.
+
dean [at] fourwalledcubicle [dot] com
- www.fourwalledcubicle.com
+ www.lufa-lib.org
*/
/*
- Copyright 2010 Dean Camera (dean [at] fourwalledcubicle [dot] com)
+ Copyright 2012 Dean Camera (dean [at] fourwalledcubicle [dot] com)
- Permission to use, copy, modify, distribute, and sell this
+ Permission to use, copy, modify, distribute, and sell this
software and its documentation for any purpose is hereby granted
- without fee, provided that the above copyright notice appear in
+ without fee, provided that the above copyright notice appear in
all copies and that both that the copyright notice and this
- permission notice and warranty disclaimer appear in supporting
- documentation, and that the name of the author not be used in
- advertising or publicity pertaining to distribution of the
+ permission notice and warranty disclaimer appear in supporting
+ documentation, and that the name of the author not be used in
+ advertising or publicity pertaining to distribution of the
software without specific, written prior permission.
The author disclaim all warranties with regard to this
{
/* Send the given 16-bit address to the target, LSB first */
XPROGTarget_SendByte(TPI_CMD_SSTPR | 0);
- XPROGTarget_SendByte(((uint8_t*)&AbsoluteAddress)[0]);
+ XPROGTarget_SendByte(AbsoluteAddress & 0xFF);
XPROGTarget_SendByte(TPI_CMD_SSTPR | 1);
- XPROGTarget_SendByte(((uint8_t*)&AbsoluteAddress)[1]);
+ XPROGTarget_SendByte(AbsoluteAddress >> 8);
}
/** Sends a SIN command to the target with the specified I/O address, ready for the data byte to be written.
bool TINYNVM_WaitWhileNVMBusBusy(void)
{
/* Poll the STATUS register to check to see if NVM access has been enabled */
- while (TimeoutMSRemaining)
+ for (;;)
{
/* Send the SLDCS command to read the TPI STATUS register to see the NVM bus is active */
XPROGTarget_SendByte(TPI_CMD_SLDCS | TPI_STATUS_REG);
uint8_t StatusRegister = XPROGTarget_ReceiveByte();
/* We might have timed out waiting for the status register read response, check here */
- if (!(TimeoutMSRemaining))
+ if (!(TimeoutTicksRemaining))
return false;
/* Check the status register read response to see if the NVM bus is enabled */
if (StatusRegister & TPI_STATUS_NVM)
- {
- TimeoutMSRemaining = COMMAND_TIMEOUT_MS;
- return true;
- }
+ return true;
}
-
- return false;
}
/** Waits while the target's NVM controller is busy performing an operation, exiting if the
bool TINYNVM_WaitWhileNVMControllerBusy(void)
{
/* Poll the STATUS register to check to see if NVM access has been enabled */
- while (TimeoutMSRemaining)
+ for (;;)
{
/* Send the SIN command to read the TPI STATUS register to see the NVM bus is busy */
TINYNVM_SendReadNVMRegister(XPROG_Param_NVMCSRRegAddr);
uint8_t StatusRegister = XPROGTarget_ReceiveByte();
/* We might have timed out waiting for the status register read response, check here */
- if (!(TimeoutMSRemaining))
+ if (!(TimeoutTicksRemaining))
return false;
/* Check to see if the BUSY flag is still set */
if (!(StatusRegister & (1 << 7)))
- {
- TimeoutMSRemaining = COMMAND_TIMEOUT_MS;
- return true;
- }
+ return true;
}
+}
+
+/** Enables the physical TPI interface on the target and enables access to the internal NVM controller.
+ *
+ * \return Boolean true if the TPI interface was enabled successfully, false otherwise
+ */
+bool TINYNVM_EnableTPI(void)
+{
+ /* Enable TPI programming mode with the attached target */
+ XPROGTarget_EnableTargetTPI();
+
+ /* Lower direction change guard time to 32 USART bits */
+ XPROGTarget_SendByte(TPI_CMD_SSTCS | TPI_CTRL_REG);
+ XPROGTarget_SendByte(0x02);
+
+ /* 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--)
+ XPROGTarget_SendByte(TPI_NVMENABLE_KEY[i - 1]);
+
+ /* Wait until the NVM bus becomes active */
+ return TINYNVM_WaitWhileNVMBusBusy();
+}
+
+/** Removes access to the target's NVM controller and physically disables the target's physical TPI interface. */
+void TINYNVM_DisableTPI(void)
+{
+ TINYNVM_WaitWhileNVMBusBusy();
- return false;
+ do
+ {
+ /* Clear the NVMEN bit in the TPI STATUS register to disable TPI mode */
+ XPROGTarget_SendByte(TPI_CMD_SSTCS | TPI_STATUS_REG);
+ XPROGTarget_SendByte(0x00);
+
+ /* Read back the STATUS register, check to see if it took effect */
+ XPROGTarget_SendByte(TPI_CMD_SLDCS | PDI_RESET_REG);
+ } while (XPROGTarget_ReceiveByte() != 0x00);
+
+ XPROGTarget_DisableTargetTPI();
}
/** Reads memory from the target's memory spaces.
*
* \return Boolean true if the command sequence complete successfully
*/
-bool TINYNVM_ReadMemory(const uint16_t ReadAddress, uint8_t* ReadBuffer, uint16_t ReadSize)
+bool TINYNVM_ReadMemory(const uint16_t ReadAddress,
+ uint8_t* ReadBuffer,
+ uint16_t ReadSize)
{
/* Wait until the NVM controller is no longer busy */
if (!(TINYNVM_WaitWhileNVMControllerBusy()))
/* Set the NVM control register to the NO OP command for memory reading */
TINYNVM_SendWriteNVMRegister(XPROG_Param_NVMCMDRegAddr);
XPROGTarget_SendByte(TINY_NVM_CMD_NOOP);
-
+
/* Send the address of the location to read from */
TINYNVM_SendPointerAddress(ReadAddress);
-
- while (ReadSize-- && TimeoutMSRemaining)
+
+ while (ReadSize-- && TimeoutTicksRemaining)
{
/* Read the byte of data from the target */
XPROGTarget_SendByte(TPI_CMD_SLD | TPI_POINTER_INDIRECT_PI);
*(ReadBuffer++) = XPROGTarget_ReceiveByte();
}
-
- return (TimeoutMSRemaining != 0);
+
+ return (TimeoutTicksRemaining > 0);
}
/** Writes word addressed memory to the target's memory spaces.
*
* \return Boolean true if the command sequence complete successfully
*/
-bool TINYNVM_WriteMemory(const uint16_t WriteAddress, uint8_t* WriteBuffer, uint16_t WriteLength)
+bool TINYNVM_WriteMemory(const uint16_t WriteAddress,
+ uint8_t* WriteBuffer,
+ uint16_t WriteLength)
{
/* Wait until the NVM controller is no longer busy */
if (!(TINYNVM_WaitWhileNVMControllerBusy()))
return false;
-
+
/* Must have an integer number of words to write - if extra byte, word-align via a dummy high byte */
if (WriteLength & 0x01)
WriteBuffer[WriteLength++] = 0xFF;
- /* Set the NVM control register to the WORD WRITE command for memory reading */
+ /* Set the NVM control register to the WORD WRITE command for memory writing */
TINYNVM_SendWriteNVMRegister(XPROG_Param_NVMCMDRegAddr);
XPROGTarget_SendByte(TINY_NVM_CMD_WORDWRITE);
-
+
/* Send the address of the location to write to */
TINYNVM_SendPointerAddress(WriteAddress);
-
+
while (WriteLength)
{
/* Wait until the NVM controller is no longer busy */
/* Write the low byte of data to the target */
XPROGTarget_SendByte(TPI_CMD_SST | TPI_POINTER_INDIRECT_PI);
XPROGTarget_SendByte(*(WriteBuffer++));
-
+
/* Write the high byte of data to the target */
XPROGTarget_SendByte(TPI_CMD_SST | TPI_POINTER_INDIRECT_PI);
XPROGTarget_SendByte(*(WriteBuffer++));
- /* Need to decrement the write length twice, since we read out a whole word */
+ /* Need to decrement the write length twice, since we wrote a whole two-byte word */
WriteLength -= 2;
}
-
+
return true;
}
*
* \return Boolean true if the command sequence complete successfully
*/
-bool TINYNVM_EraseMemory(const uint8_t EraseCommand, const uint16_t Address)
+bool TINYNVM_EraseMemory(const uint8_t EraseCommand,
+ const uint16_t Address)
{
/* Wait until the NVM controller is no longer busy */
if (!(TINYNVM_WaitWhileNVMControllerBusy()))
/* Wait until the NVM controller is no longer busy */
if (!(TINYNVM_WaitWhileNVMControllerBusy()))
return false;
-
+
return true;
}
#endif
+
projects / pub / USBasp.git / blobdiff