/*
LUFA Library
- Copyright (C) Dean Camera, 2010.
-
+ Copyright (C) Dean Camera, 2011.
+
dean [at] fourwalledcubicle [dot] com
- www.fourwalledcubicle.com
+ www.lufa-lib.org
*/
/*
- Copyright 2010 Dean Camera (dean [at] fourwalledcubicle [dot] com)
+ Copyright 2011 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
static void XMEGANVM_SendAddress(const uint32_t AbsoluteAddress)
{
/* Send the given 32-bit address to the target, LSB first */
- XPROGTarget_SendByte(((uint8_t*)&AbsoluteAddress)[0]);
- XPROGTarget_SendByte(((uint8_t*)&AbsoluteAddress)[1]);
- XPROGTarget_SendByte(((uint8_t*)&AbsoluteAddress)[2]);
- XPROGTarget_SendByte(((uint8_t*)&AbsoluteAddress)[3]);
+ XPROGTarget_SendByte(AbsoluteAddress & 0xFF);
+ XPROGTarget_SendByte(AbsoluteAddress >> 8);
+ XPROGTarget_SendByte(AbsoluteAddress >> 16);
+ XPROGTarget_SendByte(AbsoluteAddress >> 24);
}
/** Sends the given NVM register address to the target.
bool XMEGANVM_WaitWhileNVMBusBusy(void)
{
/* Poll the STATUS register to check to see if NVM access has been enabled */
- while (TimeoutMSRemaining)
+ for (;;)
{
/* Send the LDCS command to read the PDI STATUS register to see the NVM bus is active */
XPROGTarget_SendByte(PDI_CMD_LDCS | PDI_STATUS_REG);
-
+
uint8_t StatusRegister = XPROGTarget_ReceiveByte();
-
+
/* We might have timed out waiting for the status register read response, check here */
- if (!(TimeoutMSRemaining))
+ if (TimeoutExpired)
return false;
-
+
/* Check the status register read response to see if the NVM bus is enabled */
if (StatusRegister & PDI_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 XMEGANVM_WaitWhileNVMControllerBusy(void)
{
+ /* Preload the pointer register with the NVM STATUS register address to check the BUSY flag */
+ XPROGTarget_SendByte(PDI_CMD_ST | (PDI_POINTER_DIRECT << 2) | PDI_DATSIZE_4BYTES);
+ XMEGANVM_SendNVMRegAddress(XMEGA_NVM_REG_STATUS);
+
/* Poll the NVM STATUS register while the NVM controller is busy */
- while (TimeoutMSRemaining)
+ for (;;)
{
- /* Send a LDS command to read the NVM STATUS register to check the BUSY flag */
- XPROGTarget_SendByte(PDI_CMD_LDS | (PDI_DATSIZE_4BYTES << 2));
- XMEGANVM_SendNVMRegAddress(XMEGA_NVM_REG_STATUS);
-
+ /* Fetch the current status value via the pointer register (without auto-increment afterwards) */
+ XPROGTarget_SendByte(PDI_CMD_LD | (PDI_POINTER_INDIRECT << 2) | PDI_DATSIZE_1BYTE);
+
uint8_t StatusRegister = XPROGTarget_ReceiveByte();
/* We might have timed out waiting for the status register read response, check here */
- if (!(TimeoutMSRemaining))
+ if (TimeoutExpired)
return false;
/* Check to see if the BUSY flag is still set */
if (!(StatusRegister & (1 << 7)))
- {
- TimeoutMSRemaining = COMMAND_TIMEOUT_MS;
- return true;
- }
+ return true;
}
-
- return false;
+}
+
+/** Enables the physical PDI interface on the target and enables access to the internal NVM controller.
+ *
+ * \return Boolean true if the PDI interface was enabled successfully, false otherwise
+ */
+bool XMEGANVM_EnablePDI(void)
+{
+ /* Enable PDI programming mode with the attached target */
+ XPROGTarget_EnableTargetPDI();
+
+ /* Store the RESET key into the RESET PDI register to keep the XMEGA in reset */
+ XPROGTarget_SendByte(PDI_CMD_STCS | PDI_RESET_REG);
+ XPROGTarget_SendByte(PDI_RESET_KEY);
+
+ /* Lower direction change guard time to 0 USART bits */
+ XPROGTarget_SendByte(PDI_CMD_STCS | PDI_CTRL_REG);
+ XPROGTarget_SendByte(0x07);
+
+ /* 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--)
+ XPROGTarget_SendByte(PDI_NVMENABLE_KEY[i - 1]);
+
+ /* Wait until the NVM bus becomes active */
+ return XMEGANVM_WaitWhileNVMBusBusy();
+}
+
+/** Removes access to the target's NVM controller and physically disables the target's physical PDI interface. */
+void XMEGANVM_DisablePDI(void)
+{
+ XMEGANVM_WaitWhileNVMBusBusy();
+
+ /* Clear the RESET key in the RESET PDI register to allow the XMEGA to run */
+ XPROGTarget_SendByte(PDI_CMD_STCS | PDI_RESET_REG);
+ XPROGTarget_SendByte(0x00);
+
+ /* Do it twice to make sure it takes effect (silicon bug?) */
+ XPROGTarget_SendByte(PDI_CMD_STCS | PDI_RESET_REG);
+ XPROGTarget_SendByte(0x00);
+
+ XPROGTarget_DisableTargetPDI();
}
/** Retrieves the CRC value of the given memory space.
/* Wait until the NVM controller is no longer busy */
if (!(XMEGANVM_WaitWhileNVMControllerBusy()))
return false;
-
+
/* Set the NVM command to the correct CRC read command */
XPROGTarget_SendByte(PDI_CMD_STS | (PDI_DATSIZE_4BYTES << 2));
XMEGANVM_SendNVMRegAddress(XMEGA_NVM_REG_CMD);
/* Wait until the NVM controller is no longer busy */
if (!(XMEGANVM_WaitWhileNVMControllerBusy()))
return false;
-
+
/* Load the PDI pointer register with the DAT0 register start address */
XPROGTarget_SendByte(PDI_CMD_ST | (PDI_POINTER_DIRECT << 2) | PDI_DATSIZE_4BYTES);
XMEGANVM_SendNVMRegAddress(XMEGA_NVM_REG_DAT0);
/* Send the REPEAT command to grab the CRC bytes */
XPROGTarget_SendByte(PDI_CMD_REPEAT | PDI_DATSIZE_1BYTE);
XPROGTarget_SendByte(XMEGA_CRC_LENGTH - 1);
-
+
/* Read in the CRC bytes from the target */
XPROGTarget_SendByte(PDI_CMD_LD | (PDI_POINTER_INDIRECT_PI << 2) | PDI_DATSIZE_1BYTE);
for (uint8_t i = 0; i < XMEGA_CRC_LENGTH; i++)
((uint8_t*)CRCDest)[i] = XPROGTarget_ReceiveByte();
-
- return (TimeoutMSRemaining != 0);
+
+ return (TimeoutExpired == false);
}
/** Reads memory from the target's memory spaces.
/* Wait until the NVM controller is no longer busy */
if (!(XMEGANVM_WaitWhileNVMControllerBusy()))
return false;
-
+
/* Send the READNVM command to the NVM controller for reading of an arbitrary location */
XPROGTarget_SendByte(PDI_CMD_STS | (PDI_DATSIZE_4BYTES << 2));
XMEGANVM_SendNVMRegAddress(XMEGA_NVM_REG_CMD);
/* Send the REPEAT command with the specified number of bytes to read */
XPROGTarget_SendByte(PDI_CMD_REPEAT | PDI_DATSIZE_1BYTE);
XPROGTarget_SendByte(ReadSize - 1);
-
+
/* Send a LD command with indirect access and post-increment to read out the bytes */
XPROGTarget_SendByte(PDI_CMD_LD | (PDI_POINTER_INDIRECT_PI << 2) | PDI_DATSIZE_1BYTE);
- while (ReadSize-- && TimeoutMSRemaining)
+ while (ReadSize-- && !(TimeoutExpired))
*(ReadBuffer++) = XPROGTarget_ReceiveByte();
-
- return (TimeoutMSRemaining != 0);
+
+ return (TimeoutExpired == false);
}
/** Writes byte addressed memory to the target's memory spaces.
XPROGTarget_SendByte(PDI_CMD_STS | (PDI_DATSIZE_4BYTES << 2));
XMEGANVM_SendNVMRegAddress(XMEGA_NVM_REG_CMD);
XPROGTarget_SendByte(WriteCommand);
-
- /* Send new memory byte to the memory to the target */
+
+ /* Send new memory byte to the memory of the target */
XPROGTarget_SendByte(PDI_CMD_STS | (PDI_DATSIZE_4BYTES << 2));
XMEGANVM_SendAddress(WriteAddress);
XPROGTarget_SendByte(Byte);
-
+
return true;
}
/* Send the REPEAT command with the specified number of bytes to write */
XPROGTarget_SendByte(PDI_CMD_REPEAT | PDI_DATSIZE_1BYTE);
XPROGTarget_SendByte(WriteSize - 1);
-
+
/* Send a ST command with indirect access and post-increment to write the bytes */
XPROGTarget_SendByte(PDI_CMD_ST | (PDI_POINTER_INDIRECT_PI << 2) | PDI_DATSIZE_1BYTE);
while (WriteSize--)
XPROGTarget_SendByte(*(WriteBuffer++));
}
-
+
if (PageMode & XPRG_PAGEMODE_WRITE)
{
/* Wait until the NVM controller is no longer busy */
XPROGTarget_SendByte(PDI_CMD_STS | (PDI_DATSIZE_4BYTES << 2));
XMEGANVM_SendNVMRegAddress(XMEGA_NVM_REG_CMD);
XPROGTarget_SendByte(WritePageCommand);
-
+
/* Send the address of the first page location to write the memory page */
XPROGTarget_SendByte(PDI_CMD_STS | (PDI_DATSIZE_4BYTES << 2));
XMEGANVM_SendAddress(WriteAddress);
XPROGTarget_SendByte(PDI_CMD_STS | (PDI_DATSIZE_4BYTES << 2));
XMEGANVM_SendNVMRegAddress(XMEGA_NVM_REG_CMD);
XPROGTarget_SendByte(EraseCommand);
-
+
/* Set CMDEX bit in NVM CTRLA register to start the erase sequence */
XPROGTarget_SendByte(PDI_CMD_STS | (PDI_DATSIZE_4BYTES << 2));
XMEGANVM_SendNVMRegAddress(XMEGA_NVM_REG_CTRLA);
- XPROGTarget_SendByte(1 << 0);
+ XPROGTarget_SendByte(1 << 0);
}
else if (EraseCommand == XMEGA_NVM_CMD_ERASEEEPROM)
{
/* Send the REPEAT command with the specified number of bytes to write */
XPROGTarget_SendByte(PDI_CMD_REPEAT | PDI_DATSIZE_1BYTE);
XPROGTarget_SendByte(XPROG_Param_EEPageSize - 1);
-
+
/* Send a ST command with indirect access and post-increment to tag each byte in the EEPROM page buffer */
XPROGTarget_SendByte(PDI_CMD_ST | (PDI_POINTER_INDIRECT_PI << 2) | PDI_DATSIZE_1BYTE);
for (uint8_t PageByte = 0; PageByte < XPROG_Param_EEPageSize; PageByte++)
XPROGTarget_SendByte(0x00);
-
+
/* Send the memory erase command to the target */
XPROGTarget_SendByte(PDI_CMD_STS | (PDI_DATSIZE_4BYTES << 2));
XMEGANVM_SendNVMRegAddress(XMEGA_NVM_REG_CMD);
XPROGTarget_SendByte(EraseCommand);
-
+
/* Set CMDEX bit in NVM CTRLA register to start the EEPROM erase sequence */
XPROGTarget_SendByte(PDI_CMD_STS | (PDI_DATSIZE_4BYTES << 2));
XMEGANVM_SendNVMRegAddress(XMEGA_NVM_REG_CTRLA);
- XPROGTarget_SendByte(1 << 0);
+ XPROGTarget_SendByte(1 << 0);
}
else
{
XPROGTarget_SendByte(PDI_CMD_STS | (PDI_DATSIZE_4BYTES << 2));
XMEGANVM_SendNVMRegAddress(XMEGA_NVM_REG_CMD);
XPROGTarget_SendByte(EraseCommand);
-
+
/* Other erase modes just need us to address a byte within the target memory space */
XPROGTarget_SendByte(PDI_CMD_STS | (PDI_DATSIZE_4BYTES << 2));
XMEGANVM_SendAddress(Address);
XPROGTarget_SendByte(0x00);
}
-
+
/* Wait until the NVM bus is ready again */
if (!(XMEGANVM_WaitWhileNVMBusBusy()))
return false;
-
+
return true;
}
#endif
+
projects / pub / USBasp.git / blobdiff