diff options
Diffstat (limited to 'lib/lufa/Projects/AVRISP-MKII/Lib/XPROG/TINYNVM.c')
| -rw-r--r-- | lib/lufa/Projects/AVRISP-MKII/Lib/XPROG/TINYNVM.c | 274 |
1 files changed, 274 insertions, 0 deletions
diff --git a/lib/lufa/Projects/AVRISP-MKII/Lib/XPROG/TINYNVM.c b/lib/lufa/Projects/AVRISP-MKII/Lib/XPROG/TINYNVM.c new file mode 100644 index 000000000..22eb7d74c --- /dev/null +++ b/lib/lufa/Projects/AVRISP-MKII/Lib/XPROG/TINYNVM.c @@ -0,0 +1,274 @@ +/* + LUFA Library + Copyright (C) Dean Camera, 2017. + + dean [at] fourwalledcubicle [dot] com + www.lufa-lib.org +*/ + +/* + Copyright 2017 Dean Camera (dean [at] fourwalledcubicle [dot] com) + + 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 + 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 + software without specific, written prior permission. + + The author disclaims all warranties with regard to this + software, including all implied warranties of merchantability + and fitness. In no event shall the author be liable for any + special, indirect or consequential damages or any damages + whatsoever resulting from loss of use, data or profits, whether + in an action of contract, negligence or other tortious action, + arising out of or in connection with the use or performance of + this software. +*/ + +/** \file + * + * Target-related functions for the TINY target's NVM module. + */ + +#define INCLUDE_FROM_TINYNVM_C +#include "TINYNVM.h" + +#if defined(ENABLE_XPROG_PROTOCOL) || defined(__DOXYGEN__) + +/** Sends the given pointer address to the target's TPI pointer register */ +static void TINYNVM_SendPointerAddress(const uint16_t AbsoluteAddress) +{ + /* Send the given 16-bit address to the target, LSB first */ + XPROGTarget_SendByte(TPI_CMD_SSTPR | 0); + XPROGTarget_SendByte(AbsoluteAddress & 0xFF); + XPROGTarget_SendByte(TPI_CMD_SSTPR | 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. + * + * \param[in] Address 6-bit I/O address to write to in the target's I/O memory space + */ +static void TINYNVM_SendReadNVMRegister(const uint8_t Address) +{ + /* The TPI command for reading from the I/O space uses strange addressing, where the I/O address's upper + * two bits of the 6-bit address are shifted left once - use function to reduce code size */ + XPROGTarget_SendByte(TPI_CMD_SIN(Address)); +} + +/** Sends a SOUT command to the target with the specified I/O address, ready for the data byte to be read. + * + * \param[in] Address 6-bit I/O address to read from in the target's I/O memory space + */ +static void TINYNVM_SendWriteNVMRegister(const uint8_t Address) +{ + /* The TPI command for reading from the I/O space uses strange addressing, where the I/O address's upper + * two bits of the 6-bit address are shifted left once - use function to reduce code size */ + XPROGTarget_SendByte(TPI_CMD_SOUT(Address)); +} + +/** Busy-waits while the NVM controller is busy performing a NVM operation, such as a FLASH page read. + * + * \return Boolean \c true if the NVM controller became ready within the timeout period, \c false otherwise + */ +bool TINYNVM_WaitWhileNVMBusBusy(void) +{ + /* Poll the STATUS register to check to see if NVM access has been enabled */ + for (;;) + { + /* Send the SLDCS command to read the TPI STATUS register to see the NVM bus is active */ + XPROGTarget_SendByte(TPI_CMD_SLDCS(TPI_REG_STATUS)); + + uint8_t StatusRegister = XPROGTarget_ReceiveByte(); + + /* We might have timed out waiting for the status register read response, check here */ + if (!(TimeoutTicksRemaining)) + return false; + + /* Check the status register read response to see if the NVM bus is enabled */ + if (StatusRegister & TPI_STATUS_NVM) + return true; + } +} + +/** Waits while the target's NVM controller is busy performing an operation, exiting if the + * timeout period expires. + * + * \return Boolean \c true if the NVM controller became ready within the timeout period, \c false otherwise + */ +bool TINYNVM_WaitWhileNVMControllerBusy(void) +{ + /* Poll the STATUS register to check to see if NVM access has been enabled */ + 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 (!(TimeoutTicksRemaining)) + return false; + + /* Check to see if the BUSY flag is still set */ + if (!(StatusRegister & (1 << 7))) + return true; + } +} + +/** Enables the physical TPI interface on the target and enables access to the internal NVM controller. + * + * \return Boolean \c true if the TPI interface was enabled successfully, \c 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_REG_CTRL)); + 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(); + + do + { + /* Clear the NVMEN bit in the TPI STATUS register to disable TPI mode */ + XPROGTarget_SendByte(TPI_CMD_SSTCS(TPI_REG_STATUS)); + XPROGTarget_SendByte(0x00); + + /* Read back the STATUS register, check to see if it took effect */ + XPROGTarget_SendByte(TPI_CMD_SLDCS(TPI_REG_STATUS)); + } while (XPROGTarget_ReceiveByte() != 0x00); + + XPROGTarget_DisableTargetTPI(); +} + +/** Reads memory from the target's memory spaces. + * + * \param[in] ReadAddress Start address to read from within the target's address space + * \param[out] ReadBuffer Buffer to store read data into + * \param[in] ReadSize Length of the data to read from the device + * + * \return Boolean \c true if the command sequence complete successfully + */ +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())) + return false; + + /* 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-- && TimeoutTicksRemaining) + { + /* Read the byte of data from the target */ + XPROGTarget_SendByte(TPI_CMD_SLD(TPI_POINTER_INDIRECT_PI)); + *(ReadBuffer++) = XPROGTarget_ReceiveByte(); + } + + return (TimeoutTicksRemaining > 0); +} + +/** Writes word addressed memory to the target's memory spaces. + * + * \param[in] WriteAddress Start address to write to within the target's address space + * \param[in] WriteBuffer Buffer to source data from + * \param[in] WriteLength Total number of bytes to write to the device (must be an integer multiple of 2) + * + * \return Boolean \c true if the command sequence complete successfully + */ +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 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 */ + if (!(TINYNVM_WaitWhileNVMControllerBusy())) + return false; + + /* 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 wrote a whole two-byte word */ + WriteLength -= 2; + } + + return true; +} + +/** Erases the target's memory space. + * + * \param[in] EraseCommand NVM erase command to send to the device + * \param[in] Address Address inside the memory space to erase + * + * \return Boolean \c true if the command sequence complete successfully + */ +bool TINYNVM_EraseMemory(const uint8_t EraseCommand, + const uint16_t Address) +{ + /* Wait until the NVM controller is no longer busy */ + if (!(TINYNVM_WaitWhileNVMControllerBusy())) + return false; + + /* Set the NVM control register to the target memory erase command */ + TINYNVM_SendWriteNVMRegister(XPROG_Param_NVMCMDRegAddr); + XPROGTarget_SendByte(EraseCommand); + + /* Write to a high byte location within the target address space to start the erase process */ + TINYNVM_SendPointerAddress(Address | 0x0001); + XPROGTarget_SendByte(TPI_CMD_SST(TPI_POINTER_INDIRECT)); + XPROGTarget_SendByte(0x00); + + /* Wait until the NVM controller is no longer busy */ + if (!(TINYNVM_WaitWhileNVMControllerBusy())) + return false; + + return true; +} + +#endif + |