Projects/AVRISP-MKII/Lib/XPROG/TINYNVM.c

   1 /*
   2              LUFA Library
   3      Copyright (C) Dean Camera, 2014.
   4
   5   dean [at] fourwalledcubicle [dot] com
   6            www.lufa-lib.org
   7 */
   8
   9 /*
  10   Copyright 2014  Dean Camera (dean [at] fourwalledcubicle [dot] com)
  11
  12   Permission to use, copy, modify, distribute, and sell this
  13   software and its documentation for any purpose is hereby granted
  14   without fee, provided that the above copyright notice appear in
  15   all copies and that both that the copyright notice and this
  16   permission notice and warranty disclaimer appear in supporting
  17   documentation, and that the name of the author not be used in
  18   advertising or publicity pertaining to distribution of the
  19   software without specific, written prior permission.
  20
  21   The author disclaims all warranties with regard to this
  22   software, including all implied warranties of merchantability
  23   and fitness.  In no event shall the author be liable for any
  24   special, indirect or consequential damages or any damages
  25   whatsoever resulting from loss of use, data or profits, whether
  26   in an action of contract, negligence or other tortious action,
  27   arising out of or in connection with the use or performance of
  28   this software.
  29 */
  30
  31 /** \file
  32  *
  33  *  Target-related functions for the TINY target's NVM module.
  34  */
  35
  36 #define  INCLUDE_FROM_TINYNVM_C
  37 #include "TINYNVM.h"
  38
  39 #if defined(ENABLE_XPROG_PROTOCOL) || defined(__DOXYGEN__)
  40
  41 /** Sends the given pointer address to the target's TPI pointer register */
  42 static void TINYNVM_SendPointerAddress(const uint16_t AbsoluteAddress)
  43 {
  44         /* Send the given 16-bit address to the target, LSB first */
  45         XPROGTarget_SendByte(TPI_CMD_SSTPR | 0);
  46         XPROGTarget_SendByte(AbsoluteAddress & 0xFF);
  47         XPROGTarget_SendByte(TPI_CMD_SSTPR | 1);
  48         XPROGTarget_SendByte(AbsoluteAddress >> 8);
  49 }
  50
  51 /** Sends a SIN command to the target with the specified I/O address, ready for the data byte to be written.
  52  *
  53  *  \param[in] Address  6-bit I/O address to write to in the target's I/O memory space
  54  */
  55 static void TINYNVM_SendReadNVMRegister(const uint8_t Address)
  56 {
  57         /* The TPI command for reading from the I/O space uses strange addressing, where the I/O address's upper
  58          * two bits of the 6-bit address are shifted left once - use function to reduce code size */
  59         XPROGTarget_SendByte(TPI_CMD_SIN(Address));
  60 }
  61
  62 /** Sends a SOUT command to the target with the specified I/O address, ready for the data byte to be read.
  63  *
  64  *  \param[in] Address  6-bit I/O address to read from in the target's I/O memory space
  65  */
  66 static void TINYNVM_SendWriteNVMRegister(const uint8_t Address)
  67 {
  68         /* The TPI command for reading from the I/O space uses strange addressing, where the I/O address's upper
  69          * two bits of the 6-bit address are shifted left once - use function to reduce code size */
  70         XPROGTarget_SendByte(TPI_CMD_SOUT(Address));
  71 }
  72
  73 /** Busy-waits while the NVM controller is busy performing a NVM operation, such as a FLASH page read.
  74  *
  75  *  \return Boolean \c true if the NVM controller became ready within the timeout period, \c false otherwise
  76  */
  77 bool TINYNVM_WaitWhileNVMBusBusy(void)
  78 {
  79         /* Poll the STATUS register to check to see if NVM access has been enabled */
  80         for (;;)
  81         {
  82                 /* Send the SLDCS command to read the TPI STATUS register to see the NVM bus is active */
  83                 XPROGTarget_SendByte(TPI_CMD_SLDCS(TPI_REG_STATUS));
  84
  85                 uint8_t StatusRegister = XPROGTarget_ReceiveByte();
  86
  87                 /* We might have timed out waiting for the status register read response, check here */
  88                 if (!(TimeoutTicksRemaining))
  89                   return false;
  90
  91                 /* Check the status register read response to see if the NVM bus is enabled */
  92                 if (StatusRegister & TPI_STATUS_NVM)
  93                   return true;
  94         }
  95 }
  96
  97 /** Waits while the target's NVM controller is busy performing an operation, exiting if the
  98  *  timeout period expires.
  99  *
 100  *  \return Boolean \c true if the NVM controller became ready within the timeout period, \c false otherwise
 101  */
 102 bool TINYNVM_WaitWhileNVMControllerBusy(void)
 103 {
 104         /* Poll the STATUS register to check to see if NVM access has been enabled */
 105         for (;;)
 106         {
 107                 /* Send the SIN command to read the TPI STATUS register to see the NVM bus is busy */
 108                 TINYNVM_SendReadNVMRegister(XPROG_Param_NVMCSRRegAddr);
 109
 110                 uint8_t StatusRegister = XPROGTarget_ReceiveByte();
 111
 112                 /* We might have timed out waiting for the status register read response, check here */
 113                 if (!(TimeoutTicksRemaining))
 114                   return false;
 115
 116                 /* Check to see if the BUSY flag is still set */
 117                 if (!(StatusRegister & (1 << 7)))
 118                   return true;
 119         }
 120 }
 121
 122 /** Enables the physical TPI interface on the target and enables access to the internal NVM controller.
 123  *
 124  *  \return Boolean \c true if the TPI interface was enabled successfully, \c false otherwise
 125  */
 126 bool TINYNVM_EnableTPI(void)
 127 {
 128         /* Enable TPI programming mode with the attached target */
 129         XPROGTarget_EnableTargetTPI();
 130
 131         /* Lower direction change guard time to 32 USART bits */
 132         XPROGTarget_SendByte(TPI_CMD_SSTCS(TPI_REG_CTRL));
 133         XPROGTarget_SendByte(0x02);
 134
 135         /* Enable access to the XPROG NVM bus by sending the documented NVM access key to the device */
 136         XPROGTarget_SendByte(TPI_CMD_SKEY);
 137         for (uint8_t i = sizeof(TPI_NVMENABLE_KEY); i > 0; i--)
 138           XPROGTarget_SendByte(TPI_NVMENABLE_KEY[i - 1]);
 139
 140         /* Wait until the NVM bus becomes active */
 141         return TINYNVM_WaitWhileNVMBusBusy();
 142 }
 143
 144 /** Removes access to the target's NVM controller and physically disables the target's physical TPI interface. */
 145 void TINYNVM_DisableTPI(void)
 146 {
 147         TINYNVM_WaitWhileNVMBusBusy();
 148
 149         do
 150         {
 151                 /* Clear the NVMEN bit in the TPI STATUS register to disable TPI mode */
 152                 XPROGTarget_SendByte(TPI_CMD_SSTCS(TPI_REG_STATUS));
 153                 XPROGTarget_SendByte(0x00);
 154
 155                 /* Read back the STATUS register, check to see if it took effect */
 156                 XPROGTarget_SendByte(TPI_CMD_SLDCS(TPI_REG_STATUS));
 157         } while (XPROGTarget_ReceiveByte() != 0x00);
 158
 159         XPROGTarget_DisableTargetTPI();
 160 }
 161
 162 /** Reads memory from the target's memory spaces.
 163  *
 164  *  \param[in]  ReadAddress  Start address to read from within the target's address space
 165  *  \param[out] ReadBuffer   Buffer to store read data into
 166  *  \param[in]  ReadSize     Length of the data to read from the device
 167  *
 168  *  \return Boolean \c true if the command sequence complete successfully
 169  */
 170 bool TINYNVM_ReadMemory(const uint16_t ReadAddress,
 171                         uint8_t* ReadBuffer,
 172                         uint16_t ReadSize)
 173 {
 174         /* Wait until the NVM controller is no longer busy */
 175         if (!(TINYNVM_WaitWhileNVMControllerBusy()))
 176           return false;
 177
 178         /* Set the NVM control register to the NO OP command for memory reading */
 179         TINYNVM_SendWriteNVMRegister(XPROG_Param_NVMCMDRegAddr);
 180         XPROGTarget_SendByte(TINY_NVM_CMD_NOOP);
 181
 182         /* Send the address of the location to read from */
 183         TINYNVM_SendPointerAddress(ReadAddress);
 184
 185         while (ReadSize-- && TimeoutTicksRemaining)
 186         {
 187                 /* Read the byte of data from the target */
 188                 XPROGTarget_SendByte(TPI_CMD_SLD(TPI_POINTER_INDIRECT_PI));
 189                 *(ReadBuffer++) = XPROGTarget_ReceiveByte();
 190         }
 191
 192         return (TimeoutTicksRemaining > 0);
 193 }
 194
 195 /** Writes word addressed memory to the target's memory spaces.
 196  *
 197  *  \param[in] WriteAddress  Start address to write to within the target's address space
 198  *  \param[in] WriteBuffer   Buffer to source data from
 199  *  \param[in] WriteLength   Total number of bytes to write to the device (must be an integer multiple of 2)
 200  *
 201  *  \return Boolean \c true if the command sequence complete successfully
 202  */
 203 bool TINYNVM_WriteMemory(const uint16_t WriteAddress,
 204                          uint8_t* WriteBuffer,
 205                          uint16_t WriteLength)
 206 {
 207         /* Wait until the NVM controller is no longer busy */
 208         if (!(TINYNVM_WaitWhileNVMControllerBusy()))
 209           return false;
 210
 211         /* Must have an integer number of words to write - if extra byte, word-align via a dummy high byte */
 212         if (WriteLength & 0x01)
 213           WriteBuffer[WriteLength++] = 0xFF;
 214
 215         /* Set the NVM control register to the WORD WRITE command for memory writing */
 216         TINYNVM_SendWriteNVMRegister(XPROG_Param_NVMCMDRegAddr);
 217         XPROGTarget_SendByte(TINY_NVM_CMD_WORDWRITE);
 218
 219         /* Send the address of the location to write to */
 220         TINYNVM_SendPointerAddress(WriteAddress);
 221
 222         while (WriteLength)
 223         {
 224                 /* Wait until the NVM controller is no longer busy */
 225                 if (!(TINYNVM_WaitWhileNVMControllerBusy()))
 226                   return false;
 227
 228                 /* Write the low byte of data to the target */
 229                 XPROGTarget_SendByte(TPI_CMD_SST(TPI_POINTER_INDIRECT_PI));
 230                 XPROGTarget_SendByte(*(WriteBuffer++));
 231
 232                 /* Write the high byte of data to the target */
 233                 XPROGTarget_SendByte(TPI_CMD_SST(TPI_POINTER_INDIRECT_PI));
 234                 XPROGTarget_SendByte(*(WriteBuffer++));
 235
 236                 /* Need to decrement the write length twice, since we wrote a whole two-byte word */
 237                 WriteLength -= 2;
 238         }
 239
 240         return true;
 241 }
 242
 243 /** Erases the target's memory space.
 244  *
 245  *  \param[in] EraseCommand  NVM erase command to send to the device
 246  *  \param[in] Address       Address inside the memory space to erase
 247  *
 248  *  \return Boolean \c true if the command sequence complete successfully
 249  */
 250 bool TINYNVM_EraseMemory(const uint8_t EraseCommand,
 251                          const uint16_t Address)
 252 {
 253         /* Wait until the NVM controller is no longer busy */
 254         if (!(TINYNVM_WaitWhileNVMControllerBusy()))
 255           return false;
 256
 257         /* Set the NVM control register to the target memory erase command */
 258         TINYNVM_SendWriteNVMRegister(XPROG_Param_NVMCMDRegAddr);
 259         XPROGTarget_SendByte(EraseCommand);
 260
 261         /* Write to a high byte location within the target address space to start the erase process */
 262         TINYNVM_SendPointerAddress(Address | 0x0001);
 263         XPROGTarget_SendByte(TPI_CMD_SST(TPI_POINTER_INDIRECT));
 264         XPROGTarget_SendByte(0x00);
 265
 266         /* Wait until the NVM controller is no longer busy */
 267         if (!(TINYNVM_WaitWhileNVMControllerBusy()))
 268           return false;
 269
 270         return true;
 271 }
 272
 273 #endif
 274