Chris Womack / DMSupport

mbed support for LPC4088 Display Module

Dependencies:   DM_FATFileSystem DM_HttpServer DM_USBHost EthernetInterface USBDevice mbed-rpc mbed-rtos mbed-src

Dependents:   emptyProgram

Fork of DMSupport by Embedded Artists

Memory/InternalEEPROM.cpp@48:2f574ffa8b96, 2016-03-26 (annotated)

Committer:
redbird
Date:
Sat Mar 26 22:50:45 2016 +0000
Revision:
48:2f574ffa8b96
Parent:
34:fc366bab393f 
changed pin names to make more sense

Who changed what in which revision?

UserRevisionLine numberNew contents of line
embeddedartists 0:6b68dac0d986 1 /*
embeddedartists 9:a33326afd686 2 * Copyright 2014 Embedded Artists AB
embeddedartists 0:6b68dac0d986 3 *
embeddedartists 0:6b68dac0d986 4 * Licensed under the Apache License, Version 2.0 (the "License");
embeddedartists 0:6b68dac0d986 5 * you may not use this file except in compliance with the License.
embeddedartists 0:6b68dac0d986 6 * You may obtain a copy of the License at
embeddedartists 0:6b68dac0d986 7 *
embeddedartists 0:6b68dac0d986 8 * http://www.apache.org/licenses/LICENSE-2.0
embeddedartists 0:6b68dac0d986 9 *
embeddedartists 0:6b68dac0d986 10 * Unless required by applicable law or agreed to in writing, software
embeddedartists 0:6b68dac0d986 11 * distributed under the License is distributed on an "AS IS" BASIS,
embeddedartists 0:6b68dac0d986 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
embeddedartists 0:6b68dac0d986 13 * See the License for the specific language governing permissions and
embeddedartists 0:6b68dac0d986 14 * limitations under the License.
embeddedartists 0:6b68dac0d986 15 */
embeddedartists 0:6b68dac0d986 16
embeddedartists 0:6b68dac0d986 17 #include "mbed.h"
embeddedartists 0:6b68dac0d986 18 #include "InternalEEPROM.h"
embeddedartists 0:6b68dac0d986 19
embeddedartists 0:6b68dac0d986 20
embeddedartists 0:6b68dac0d986 21 /******************************************************************************
embeddedartists 0:6b68dac0d986 22 * Defines and typedefs
embeddedartists 0:6b68dac0d986 23 *****************************************************************************/
embeddedartists 0:6b68dac0d986 24
embeddedartists 0:6b68dac0d986 25 #define EEPROM_INT_ENDOFRW (1<<26)
embeddedartists 0:6b68dac0d986 26 #define EEPROM_INT_ENDOFPROG (1<<28)
embeddedartists 0:6b68dac0d986 27
embeddedartists 0:6b68dac0d986 28 #define EEPROM_PWRDWN (1<<0)
embeddedartists 0:6b68dac0d986 29
embeddedartists 0:6b68dac0d986 30 /*
embeddedartists 0:6b68dac0d986 31 * Commands (for the LPC_EEPROM->CMD register)
embeddedartists 0:6b68dac0d986 32 */
embeddedartists 0:6b68dac0d986 33 #define EEPROM_CMD_8BITS_READ (0) /*!< EEPROM 8-bit read command */
embeddedartists 0:6b68dac0d986 34 #define EEPROM_CMD_16BITS_READ (1) /*!< EEPROM 16-bit read command */
embeddedartists 0:6b68dac0d986 35 #define EEPROM_CMD_32BITS_READ (2) /*!< EEPROM 32-bit read command */
embeddedartists 0:6b68dac0d986 36 #define EEPROM_CMD_8BITS_WRITE (3) /*!< EEPROM 8-bit write command */
embeddedartists 0:6b68dac0d986 37 #define EEPROM_CMD_16BITS_WRITE (4) /*!< EEPROM 16-bit write command */
embeddedartists 0:6b68dac0d986 38 #define EEPROM_CMD_32BITS_WRITE (5) /*!< EEPROM 32-bit write command */
embeddedartists 0:6b68dac0d986 39 #define EEPROM_CMD_ERASE_PRG_PAGE (6) /*!< EEPROM erase/program command */
embeddedartists 0:6b68dac0d986 40 #define EEPROM_CMD_RDPREFETCH (1 << 3)/*!< EEPROM read pre-fetch enable */
embeddedartists 0:6b68dac0d986 41
embeddedartists 0:6b68dac0d986 42
embeddedartists 0:6b68dac0d986 43 /******************************************************************************
embeddedartists 0:6b68dac0d986 44 * Local variables
embeddedartists 0:6b68dac0d986 45 *****************************************************************************/
embeddedartists 0:6b68dac0d986 46
embeddedartists 0:6b68dac0d986 47 /******************************************************************************
embeddedartists 0:6b68dac0d986 48 * Private Functions
embeddedartists 0:6b68dac0d986 49 *****************************************************************************/
embeddedartists 0:6b68dac0d986 50
embeddedartists 0:6b68dac0d986 51 void InternalEEPROM::powerUp()
embeddedartists 0:6b68dac0d986 52 {
embeddedartists 0:6b68dac0d986 53 LPC_EEPROM->PWRDWN = 0;
embeddedartists 0:6b68dac0d986 54 }
embeddedartists 0:6b68dac0d986 55
embeddedartists 0:6b68dac0d986 56 void InternalEEPROM::clearInterrupt(uint32_t mask)
embeddedartists 0:6b68dac0d986 57 {
embeddedartists 0:6b68dac0d986 58 LPC_EEPROM->INT_CLR_STATUS = mask;
embeddedartists 0:6b68dac0d986 59 }
embeddedartists 0:6b68dac0d986 60
embeddedartists 0:6b68dac0d986 61 void InternalEEPROM::waitForInterrupt(uint32_t mask)
embeddedartists 0:6b68dac0d986 62 {
embeddedartists 0:6b68dac0d986 63 while ((LPC_EEPROM->INT_STATUS & mask) != mask) {
embeddedartists 0:6b68dac0d986 64 }
embeddedartists 0:6b68dac0d986 65
embeddedartists 0:6b68dac0d986 66 clearInterrupt(mask);
embeddedartists 0:6b68dac0d986 67 }
embeddedartists 0:6b68dac0d986 68
embeddedartists 0:6b68dac0d986 69 void InternalEEPROM::setAddr(uint32_t pageAddr, uint32_t pageOffset)
embeddedartists 0:6b68dac0d986 70 {
embeddedartists 0:6b68dac0d986 71 LPC_EEPROM->ADDR = (pageAddr << 6) | pageOffset;
embeddedartists 0:6b68dac0d986 72 }
embeddedartists 0:6b68dac0d986 73
embeddedartists 0:6b68dac0d986 74 void InternalEEPROM::setCmd(uint32_t cmd)
embeddedartists 0:6b68dac0d986 75 {
embeddedartists 0:6b68dac0d986 76 LPC_EEPROM->CMD = cmd;
embeddedartists 0:6b68dac0d986 77 }
embeddedartists 0:6b68dac0d986 78
embeddedartists 0:6b68dac0d986 79 void InternalEEPROM::readPage(uint32_t pageAddr, uint32_t pageOffset, uint8_t* buf, uint32_t size)
embeddedartists 0:6b68dac0d986 80 {
embeddedartists 0:6b68dac0d986 81 clearInterrupt(EEPROM_INT_ENDOFRW);
embeddedartists 0:6b68dac0d986 82 setAddr(pageAddr, pageOffset);
embeddedartists 0:6b68dac0d986 83 setCmd(EEPROM_CMD_8BITS_READ | EEPROM_CMD_RDPREFETCH);
embeddedartists 29:b1ec19000e15 84 for (uint32_t i = 0; i < size; i++) {
embeddedartists 0:6b68dac0d986 85 buf[i] = LPC_EEPROM->RDATA & 0xff;
embeddedartists 0:6b68dac0d986 86 waitForInterrupt(EEPROM_INT_ENDOFRW);
embeddedartists 0:6b68dac0d986 87 }
embeddedartists 0:6b68dac0d986 88 }
embeddedartists 0:6b68dac0d986 89
embeddedartists 0:6b68dac0d986 90 void InternalEEPROM::writePage(uint32_t pageAddr, uint32_t pageOffset, const uint8_t* buf, uint32_t size)
embeddedartists 0:6b68dac0d986 91 {
embeddedartists 0:6b68dac0d986 92 clearInterrupt(EEPROM_INT_ENDOFRW);
embeddedartists 0:6b68dac0d986 93 setCmd(EEPROM_CMD_8BITS_WRITE);
embeddedartists 0:6b68dac0d986 94 setAddr(pageAddr, pageOffset);
embeddedartists 29:b1ec19000e15 95 for (uint32_t i = 0; i < size; i++) {
embeddedartists 0:6b68dac0d986 96 LPC_EEPROM->WDATA = buf[i];
embeddedartists 0:6b68dac0d986 97 waitForInterrupt(EEPROM_INT_ENDOFRW);
embeddedartists 0:6b68dac0d986 98 }
embeddedartists 0:6b68dac0d986 99 }
embeddedartists 0:6b68dac0d986 100
embeddedartists 0:6b68dac0d986 101 void InternalEEPROM::eraseOrProgramPage(uint32_t pageAddr)
embeddedartists 0:6b68dac0d986 102 {
embeddedartists 0:6b68dac0d986 103 // Write data from page register to non-volatile memory
embeddedartists 0:6b68dac0d986 104 clearInterrupt(EEPROM_INT_ENDOFPROG);
embeddedartists 0:6b68dac0d986 105 setAddr(pageAddr, 0);
embeddedartists 0:6b68dac0d986 106 setCmd(EEPROM_CMD_ERASE_PRG_PAGE);
embeddedartists 0:6b68dac0d986 107 waitForInterrupt(EEPROM_INT_ENDOFPROG);
embeddedartists 0:6b68dac0d986 108 }
embeddedartists 0:6b68dac0d986 109
embeddedartists 0:6b68dac0d986 110
embeddedartists 0:6b68dac0d986 111 /******************************************************************************
embeddedartists 0:6b68dac0d986 112 * Public Functions
embeddedartists 0:6b68dac0d986 113 *****************************************************************************/
embeddedartists 0:6b68dac0d986 114
embeddedartists 0:6b68dac0d986 115 InternalEEPROM::InternalEEPROM() : _initialized(false)
embeddedartists 0:6b68dac0d986 116 {
embeddedartists 0:6b68dac0d986 117 }
embeddedartists 0:6b68dac0d986 118
embeddedartists 0:6b68dac0d986 119 InternalEEPROM::~InternalEEPROM()
embeddedartists 0:6b68dac0d986 120 {
embeddedartists 0:6b68dac0d986 121 }
embeddedartists 0:6b68dac0d986 122
embeddedartists 0:6b68dac0d986 123 void InternalEEPROM::init()
embeddedartists 0:6b68dac0d986 124 {
embeddedartists 0:6b68dac0d986 125 if (!_initialized) {
embeddedartists 0:6b68dac0d986 126 // Bring EEPROM device out of power down mode
embeddedartists 0:6b68dac0d986 127 powerUp();
embeddedartists 0:6b68dac0d986 128
embeddedartists 0:6b68dac0d986 129 // Setup EEPROM timing to 375KHz based on PCLK rate
embeddedartists 0:6b68dac0d986 130 uint32_t clk = SystemCoreClock;
embeddedartists 0:6b68dac0d986 131 LPC_EEPROM->CLKDIV = SystemCoreClock / 375000 - 1;
embeddedartists 0:6b68dac0d986 132
embeddedartists 0:6b68dac0d986 133 // Setup wait states (ticks needed for 15ms, 55ms and 35ms)
embeddedartists 0:6b68dac0d986 134 uint32_t val;
embeddedartists 0:6b68dac0d986 135 val = ((((clk / 1000000) * 15) / 1000) + 1);
embeddedartists 0:6b68dac0d986 136 val |= (((((clk / 1000000) * 55) / 1000) + 1) << 8);
embeddedartists 0:6b68dac0d986 137 val |= (((((clk / 1000000) * 35) / 1000) + 1) << 16);
embeddedartists 0:6b68dac0d986 138 LPC_EEPROM->WSTATE = val;
embeddedartists 0:6b68dac0d986 139
embeddedartists 0:6b68dac0d986 140 _initialized = true;
embeddedartists 0:6b68dac0d986 141 }
embeddedartists 0:6b68dac0d986 142 }
embeddedartists 0:6b68dac0d986 143
embeddedartists 0:6b68dac0d986 144 void InternalEEPROM::powerDown()
embeddedartists 0:6b68dac0d986 145 {
embeddedartists 0:6b68dac0d986 146 LPC_EEPROM->PWRDWN = EEPROM_PWRDWN;
embeddedartists 0:6b68dac0d986 147 }
embeddedartists 0:6b68dac0d986 148
embeddedartists 20:9df19da50290 149 int InternalEEPROM::read(uint32_t addr, uint8_t* data, uint32_t size)
embeddedartists 0:6b68dac0d986 150 {
embeddedartists 0:6b68dac0d986 151 uint32_t numRead = 0;
embeddedartists 20:9df19da50290 152 uint32_t pageAddr = addr/EEPROM_PAGE_SIZE;
embeddedartists 20:9df19da50290 153 uint32_t readOffset = (addr & (EEPROM_PAGE_SIZE - 1));
embeddedartists 0:6b68dac0d986 154 uint32_t readSize = EEPROM_PAGE_SIZE - readOffset;
embeddedartists 34:fc366bab393f 155
embeddedartists 34:fc366bab393f 156 // Prevent reading past the end of the memory
embeddedartists 34:fc366bab393f 157 if (addr >= EEPROM_MEMORY_SIZE) {
embeddedartists 34:fc366bab393f 158 return 0;
embeddedartists 34:fc366bab393f 159 }
embeddedartists 34:fc366bab393f 160 if ((size + addr) > EEPROM_MEMORY_SIZE) {
embeddedartists 34:fc366bab393f 161 size = EEPROM_MEMORY_SIZE - addr;
embeddedartists 34:fc366bab393f 162 }
embeddedartists 0:6b68dac0d986 163
embeddedartists 0:6b68dac0d986 164 powerUp();
embeddedartists 0:6b68dac0d986 165
embeddedartists 0:6b68dac0d986 166 // Read and store data in buffer
embeddedartists 0:6b68dac0d986 167 while (size) {
embeddedartists 0:6b68dac0d986 168 // Make sure we don't write past the end of the buffer
embeddedartists 0:6b68dac0d986 169 if (readSize > size) {
embeddedartists 0:6b68dac0d986 170 readSize = size;
embeddedartists 0:6b68dac0d986 171 }
embeddedartists 0:6b68dac0d986 172
embeddedartists 0:6b68dac0d986 173 readPage(pageAddr, readOffset, &(data[numRead]), readSize);
embeddedartists 0:6b68dac0d986 174 numRead += readSize;
embeddedartists 0:6b68dac0d986 175 size -= readSize;
embeddedartists 0:6b68dac0d986 176
embeddedartists 0:6b68dac0d986 177 // Change to next page
embeddedartists 0:6b68dac0d986 178 pageAddr++;
embeddedartists 0:6b68dac0d986 179 readOffset = 0;
embeddedartists 0:6b68dac0d986 180 readSize = EEPROM_PAGE_SIZE;
embeddedartists 0:6b68dac0d986 181 }
embeddedartists 0:6b68dac0d986 182 return numRead;
embeddedartists 0:6b68dac0d986 183 }
embeddedartists 0:6b68dac0d986 184
embeddedartists 20:9df19da50290 185 int InternalEEPROM::write(uint32_t addr, const uint8_t* data, uint32_t size)
embeddedartists 0:6b68dac0d986 186 {
embeddedartists 0:6b68dac0d986 187 uint32_t numWritten = 0;
embeddedartists 20:9df19da50290 188 uint32_t pageAddr = addr/EEPROM_PAGE_SIZE;
embeddedartists 20:9df19da50290 189 uint32_t writeOffset = (addr & (EEPROM_PAGE_SIZE - 1));
embeddedartists 0:6b68dac0d986 190 uint32_t writeSize = EEPROM_PAGE_SIZE - writeOffset;
embeddedartists 0:6b68dac0d986 191
embeddedartists 34:fc366bab393f 192 // Prevent writing past the end of the memory
embeddedartists 34:fc366bab393f 193 if (addr >= EEPROM_MEMORY_SIZE) {
embeddedartists 34:fc366bab393f 194 return 0;
embeddedartists 34:fc366bab393f 195 }
embeddedartists 34:fc366bab393f 196 if ((size + addr) > EEPROM_MEMORY_SIZE) {
embeddedartists 34:fc366bab393f 197 size = EEPROM_MEMORY_SIZE - addr;
embeddedartists 34:fc366bab393f 198 }
embeddedartists 34:fc366bab393f 199
embeddedartists 0:6b68dac0d986 200 powerUp();
embeddedartists 0:6b68dac0d986 201
embeddedartists 0:6b68dac0d986 202 // Read and store data in buffer
embeddedartists 0:6b68dac0d986 203 while (size) {
embeddedartists 0:6b68dac0d986 204 // Make sure we don't read past the end of the buffer
embeddedartists 0:6b68dac0d986 205 if (writeSize > size) {
embeddedartists 0:6b68dac0d986 206 writeSize = size;
embeddedartists 0:6b68dac0d986 207 }
embeddedartists 0:6b68dac0d986 208
embeddedartists 0:6b68dac0d986 209 writePage(pageAddr, writeOffset, &(data[numWritten]), writeSize);
embeddedartists 0:6b68dac0d986 210 eraseOrProgramPage(pageAddr);
embeddedartists 0:6b68dac0d986 211 numWritten += writeSize;
embeddedartists 0:6b68dac0d986 212 size -= writeSize;
embeddedartists 0:6b68dac0d986 213
embeddedartists 0:6b68dac0d986 214 // Change to next page
embeddedartists 0:6b68dac0d986 215 pageAddr++;
embeddedartists 0:6b68dac0d986 216 writeOffset = 0;
embeddedartists 0:6b68dac0d986 217 writeSize = EEPROM_PAGE_SIZE;
embeddedartists 0:6b68dac0d986 218 }
embeddedartists 0:6b68dac0d986 219 return numWritten;
embeddedartists 0:6b68dac0d986 220 }