1 | /* $Id: tstDevEEPROM.cpp 98172 2023-01-21 13:01:48Z vboxsync $ */
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2 | /** @file
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3 | * EEPROM 93C46 unit tests.
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4 | */
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5 |
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6 | /*
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7 | * Copyright (C) 2007-2023 Oracle and/or its affiliates.
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8 | *
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9 | * This file is part of VirtualBox base platform packages, as
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10 | * available from https://www.virtualbox.org.
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11 | *
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12 | * This program is free software; you can redistribute it and/or
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13 | * modify it under the terms of the GNU General Public License
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14 | * as published by the Free Software Foundation, in version 3 of the
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15 | * License.
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16 | *
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17 | * This program is distributed in the hope that it will be useful, but
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18 | * WITHOUT ANY WARRANTY; without even the implied warranty of
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19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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20 | * General Public License for more details.
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21 | *
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22 | * You should have received a copy of the GNU General Public License
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23 | * along with this program; if not, see <https://www.gnu.org/licenses>.
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24 | *
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25 | * SPDX-License-Identifier: GPL-3.0-only
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26 | */
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27 |
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28 |
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29 | /*********************************************************************************************************************************
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30 | * Header Files *
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31 | *********************************************************************************************************************************/
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32 | #ifdef USE_CPPUNIT
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33 | # include <cppunit/ui/text/TestRunner.h>
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34 | # include <cppunit/extensions/HelperMacros.h>
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35 | #else
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36 | # include "CppUnitEmulation.h"
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37 | #endif
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38 | #include <VBox/vmm/pdmdev.h>
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39 | #include "../DevEEPROM.h"
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40 |
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41 |
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42 | /*********************************************************************************************************************************
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43 | * Global Variables *
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44 | *********************************************************************************************************************************/
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45 | static const uint16_t g_abInitialContent[] =
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46 | {
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47 | 0x0000, 0x0001, 0x0002, 0x0003, 0x0004, 0x0005, 0x0006, 0x0007,
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48 | 0x0008, 0x0009, 0x000a, 0x000b, 0x000c, 0x000d, 0x000e, 0x000f,
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49 | 0x0010, 0x0011, 0x0012, 0x0013, 0x0014, 0x0015, 0x0016, 0x0017,
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50 | 0x0018, 0x0019, 0x001a, 0x001b, 0x001c, 0x001d, 0x001e, 0x001f,
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51 | 0x0020, 0x0021, 0x0022, 0x0023, 0x0024, 0x0025, 0x0026, 0x0027,
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52 | 0x0028, 0x0029, 0x002a, 0x002b, 0x002c, 0x002d, 0x002e, 0x002f,
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53 | 0x0030, 0x0031, 0x0032, 0x0033, 0x0034, 0x0035, 0x0036, 0x0037,
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54 | 0x0038, 0x0039, 0x003a, 0x003b, 0x003c, 0x003d, 0x003e, 0x003f
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55 | };
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56 |
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57 |
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58 | /**
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59 | * Test fixture for 93C46-compatible EEPROM device emulation.
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60 | */
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61 | class EEPROMTest
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62 | #ifdef USE_CPPUNIT
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63 | : public CppUnit::TestFixture
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64 | #endif
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65 | {
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66 | CPPUNIT_TEST_SUITE( tstDevEEPROM );
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67 |
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68 | CPPUNIT_TEST( testRead );
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69 | CPPUNIT_TEST( testSequentialRead );
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70 | CPPUNIT_TEST( testWrite );
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71 | CPPUNIT_TEST( testWriteAll );
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72 | CPPUNIT_TEST( testWriteDisabled );
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73 | CPPUNIT_TEST( testErase );
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74 | CPPUNIT_TEST( testEraseAll );
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75 |
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76 | CPPUNIT_TEST_SUITE_END();
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77 |
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78 | private:
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79 | enum Wires { DO=8, DI=4, CS=2, SK=0x01 };
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80 | enum OpCodes {
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81 | READ_OPCODE = 0x6,
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82 | WRITE_OPCODE = 0x5,
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83 | ERASE_OPCODE = 0x7,
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84 | EWDS_OPCODE = 0x10, // erase/write disable
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85 | WRAL_OPCODE = 0x11, // write all
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86 | ERAL_OPCODE = 0x12, // erase all
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87 | EWEN_OPCODE = 0x13 // erase/write enable
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88 | };
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89 | enum BitWidths {
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90 | READ_OPCODE_BITS = 3,
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91 | WRITE_OPCODE_BITS = 3,
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92 | ERASE_OPCODE_BITS = 3,
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93 | EWDS_OPCODE_BITS = 5,
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94 | WRAL_OPCODE_BITS = 5,
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95 | ERAL_OPCODE_BITS = 5,
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96 | EWEN_OPCODE_BITS = 5,
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97 | READ_ADDR_BITS = 6,
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98 | WRITE_ADDR_BITS = 6,
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99 | ERASE_ADDR_BITS = 6,
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100 | EWDS_ADDR_BITS = 4,
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101 | WRAL_ADDR_BITS = 4,
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102 | ERAL_ADDR_BITS = 4,
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103 | EWEN_ADDR_BITS = 4,
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104 | DATA_BITS = 16
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105 | };
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106 |
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107 | EEPROM93C46 *eeprom;
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108 |
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109 | // Helper methods
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110 | void shiftOutBits(uint16_t data, uint16_t count);
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111 | uint16_t shiftInBits(uint16_t count);
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112 | void getReady();
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113 | void standby();
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114 | void stop();
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115 | uint16_t readAt(uint16_t addr);
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116 | bool writeTo(uint16_t addr, uint16_t value);
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117 | void writeOpAddr(int opCode, int opCodeBits, uint16_t addr, int addrBits);
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118 | void writeData(uint16_t value) { shiftOutBits(value, DATA_BITS); }
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119 | bool waitForCompletion();
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120 |
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121 | public:
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122 | void setUp()
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123 | {
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124 | eeprom = new EEPROM93C46;
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125 | eeprom->init(g_abInitialContent);
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126 | }
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127 |
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128 | void tearDown()
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129 | {
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130 | delete eeprom;
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131 | }
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132 |
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133 | void testSize()
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134 | {
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135 | CPPUNIT_ASSERT_EQUAL( sizeof(g_abInitialContent), (size_t)EEPROM93C46::SIZE );
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136 | }
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137 |
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138 | void testRead()
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139 | {
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140 | getReady();
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141 | for ( uint32_t wordAddr=0; wordAddr < EEPROM93C46::SIZE; wordAddr++ ) {
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142 | shiftOutBits(READ_OPCODE, READ_OPCODE_BITS);
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143 | shiftOutBits(wordAddr, READ_ADDR_BITS);
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144 |
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145 | CPPUNIT_ASSERT_EQUAL( g_abInitialContent[wordAddr], (uint16_t)wordAddr );
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146 | CPPUNIT_ASSERT_EQUAL( g_abInitialContent[wordAddr], shiftInBits(DATA_BITS) );
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147 | standby();
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148 | }
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149 | stop();
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150 | }
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151 |
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152 | void testSequentialRead()
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153 | {
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154 | getReady();
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155 | shiftOutBits(READ_OPCODE, READ_OPCODE_BITS);
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156 | shiftOutBits(0, READ_ADDR_BITS);
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157 | for ( int wordAddr=0; wordAddr < EEPROM93C46::SIZE; wordAddr++ ) {
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158 | CPPUNIT_ASSERT_EQUAL( g_abInitialContent[wordAddr], shiftInBits(DATA_BITS) );
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159 | }
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160 | stop();
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161 | }
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162 |
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163 | void testWrite()
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164 | {
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165 | //unused: int i;
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166 | uint16_t wordAddr;
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167 |
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168 | getReady();
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169 | // Enable write
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170 | writeOpAddr(EWEN_OPCODE, EWEN_OPCODE_BITS, 0, EWEN_ADDR_BITS);
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171 | standby();
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172 |
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173 | for ( wordAddr=0; wordAddr < EEPROM93C46::SIZE; wordAddr++ ) {
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174 | //writeOpAddr(WRITE_OPCODE, WRITE_OPCODE_BITS, (uint16_t)wordAddr, WRITE_ADDR_BITS);
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175 | writeTo(wordAddr, 0x3F00 - (wordAddr<<8));
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176 | standby();
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177 |
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178 | if (!waitForCompletion()) {
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179 | CPPUNIT_FAIL("EEPROM write was not completed");
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180 | stop();
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181 | return;
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182 | }
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183 | standby();
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184 | }
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185 |
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186 | // Disable write
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187 | writeOpAddr(EWDS_OPCODE, EWDS_OPCODE_BITS, 0, EWDS_ADDR_BITS);
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188 |
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189 | stop();
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190 |
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191 | // Now check the result
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192 | getReady();
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193 | writeOpAddr(READ_OPCODE, READ_OPCODE_BITS, 0, READ_ADDR_BITS);
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194 | for ( wordAddr=0; wordAddr < EEPROM93C46::SIZE; wordAddr++ ) {
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195 | CPPUNIT_ASSERT_EQUAL((uint16_t)(0x3F00 - (wordAddr<<8)), shiftInBits(DATA_BITS) );
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196 | }
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197 | stop();
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198 | }
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199 |
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200 | void testWriteDisabled()
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201 | {
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202 | getReady();
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203 |
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204 | uint16_t addr = 0;
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205 | uint16_t oldValue = readAt(addr);
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206 | stop();
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207 | getReady();
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208 | if (writeTo(addr, ~oldValue)) {
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209 | // Write appears to be successful -- continue
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210 | CPPUNIT_ASSERT_EQUAL(oldValue, readAt(addr));
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211 | }
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212 | else {
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213 | CPPUNIT_FAIL("EEPROM write was not completed");
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214 | }
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215 | stop();
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216 | }
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217 |
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218 | void testErase()
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219 | {
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220 | int i;
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221 | uint16_t addr = 0x1F;
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222 |
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223 | getReady();
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224 | // Enable write
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225 | shiftOutBits(EWEN_OPCODE, EWEN_OPCODE_BITS);
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226 | shiftOutBits(0, EWEN_ADDR_BITS);
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227 | standby();
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228 |
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229 | if (writeTo(addr, addr)) {
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230 | stop();
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231 | getReady();
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232 | // Write successful -- continue
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233 | CPPUNIT_ASSERT_EQUAL(addr, readAt(addr));
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234 | stop();
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235 | getReady();
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236 |
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237 | shiftOutBits(ERASE_OPCODE, ERASE_OPCODE_BITS);
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238 | shiftOutBits(addr, ERASE_ADDR_BITS);
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239 |
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240 | standby();
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241 |
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242 | for (i = 0; i < 200; i++) {
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243 | if (eeprom->read() & DO)
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244 | break;
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245 | //usec_delay(50);
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246 | }
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247 |
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248 | if (i == 200) {
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249 | CPPUNIT_FAIL("EEPROM erase was not completed");
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250 | stop();
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251 | return;
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252 | }
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253 |
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254 | standby();
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255 |
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256 | shiftOutBits(EWDS_OPCODE, EWDS_OPCODE_BITS);
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257 | shiftOutBits(0, EWDS_ADDR_BITS);
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258 |
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259 | stop();
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260 | getReady();
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261 | CPPUNIT_ASSERT_EQUAL((uint16_t)0xFFFF, readAt(addr));
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262 | }
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263 | else {
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264 | CPPUNIT_FAIL("EEPROM write was not completed");
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265 | }
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266 | stop();
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267 | }
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268 |
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269 | void testWriteAll()
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270 | {
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271 | uint16_t addr;
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272 |
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273 | getReady();
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274 | // Enable write
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275 | writeOpAddr(EWEN_OPCODE, EWEN_OPCODE_BITS, 0, EWEN_ADDR_BITS);
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276 | standby();
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277 | // Fill all memory
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278 | writeOpAddr(WRAL_OPCODE, WRAL_OPCODE_BITS, 0, WRAL_ADDR_BITS);
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279 | writeData(0xABBA);
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280 | standby();
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281 |
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282 | if (waitForCompletion()) {
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283 | stop();
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284 | getReady();
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285 | // Write successful -- verify all memory
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286 | for ( addr=0; addr < EEPROM93C46::SIZE; addr++ ) {
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287 | CPPUNIT_ASSERT_EQUAL((uint16_t)0xABBA, readAt(addr));
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288 | }
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289 | }
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290 | else {
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291 | CPPUNIT_FAIL("EEPROM write was not completed");
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292 | }
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293 | stop();
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294 | }
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295 |
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296 | void testEraseAll()
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297 | {
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298 | //unused: int i;
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299 | uint16_t addr = 0x1F;
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300 |
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301 | getReady();
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302 | // Enable write
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303 | writeOpAddr(EWEN_OPCODE, EWEN_OPCODE_BITS, 0, EWEN_ADDR_BITS);
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304 | standby();
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305 | // Fill all memory
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306 | writeOpAddr(WRITE_OPCODE, WRITE_OPCODE_BITS, addr, WRITE_ADDR_BITS);
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307 | writeData(0);
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308 | standby();
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309 |
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310 | if (waitForCompletion()) {
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311 | stop();
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312 | getReady();
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313 | // Write successful -- verify random location
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314 | CPPUNIT_ASSERT_EQUAL((uint16_t)0, readAt(addr));
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315 | stop();
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316 | getReady();
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317 |
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318 | writeOpAddr(ERAL_OPCODE, ERAL_OPCODE_BITS, addr, ERAL_ADDR_BITS);
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319 | standby();
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320 |
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321 | if (!waitForCompletion()) {
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322 | CPPUNIT_FAIL("EEPROM erase was not completed");
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323 | stop();
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324 | return;
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325 | }
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326 |
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327 | standby();
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328 |
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329 | writeOpAddr(EWDS_OPCODE, EWDS_OPCODE_BITS, 0, EWDS_ADDR_BITS);
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330 | stop();
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331 |
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332 | getReady();
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333 | for ( addr=0; addr < EEPROM93C46::SIZE; addr++ ) {
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334 | CPPUNIT_ASSERT_EQUAL((uint16_t)0xFFFF, readAt(addr));
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335 | }
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336 | }
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337 | else {
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338 | CPPUNIT_FAIL("EEPROM write was not completed");
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339 | }
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340 | stop();
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341 | }
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342 | };
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343 |
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344 | /**
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345 | * shiftOutBits - Shift data bits our to the EEPROM
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346 | * @hw: pointer to the EEPROM object
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347 | * @data: data to send to the EEPROM
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348 | * @count: number of bits to shift out
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349 | *
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350 | * We need to shift 'count' bits out to the EEPROM. So, the value in the
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351 | * "data" parameter will be shifted out to the EEPROM one bit at a time.
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352 | * In order to do this, "data" must be broken down into bits.
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353 | **/
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354 | void EEPROMTest::shiftOutBits(uint16_t data, uint16_t count) {
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355 | uint32_t wires = eeprom->read();
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356 | uint32_t mask;
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357 |
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358 | mask = 0x01 << (count - 1);
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359 | wires &= ~DO;
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360 |
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361 | do {
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362 | wires &= ~DI;
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363 |
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364 | if (data & mask)
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365 | wires |= DI;
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366 |
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367 | eeprom->write(wires);
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368 |
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369 | // Raise clock
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370 | eeprom->write(wires |= SK);
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371 | // Lower clock
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372 | eeprom->write(wires &= ~SK);
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373 |
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374 | mask >>= 1;
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375 | } while (mask);
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376 |
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377 | wires &= ~DI;
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378 | eeprom->write(wires);
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379 | }
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380 |
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381 | /**
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382 | * shiftInBits - Shift data bits in from the EEPROM
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383 | * @count: number of bits to shift in
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384 | *
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385 | * In order to read a register from the EEPROM, we need to shift 'count' bits
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386 | * in from the EEPROM. Bits are "shifted in" by raising the clock input to
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387 | * the EEPROM (setting the SK bit), and then reading the value of the data out
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388 | * "DO" bit. During this "shifting in" process the data in "DI" bit should
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389 | * always be clear.
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390 | **/
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391 | uint16_t EEPROMTest::shiftInBits(uint16_t count)
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392 | {
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393 | uint32_t wires;
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394 | uint32_t i;
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395 | uint16_t data;
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396 |
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397 | wires = eeprom->read();
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398 |
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399 | wires &= ~(DO | DI);
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400 | data = 0;
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401 |
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402 | for (i = 0; i < count; i++) {
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403 | data <<= 1;
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404 | // Raise clock
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405 | eeprom->write(wires |= SK);
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406 |
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407 | wires = eeprom->read();
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408 |
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409 | wires &= ~DI;
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410 | if (wires & DO)
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411 | data |= 1;
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412 |
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413 | // Lower clock
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414 | eeprom->write(wires &= ~SK);
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415 | }
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416 |
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417 | return data;
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418 | }
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419 |
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420 | /**
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421 | * getReady - Prepares EEPROM for read/write
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422 | *
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423 | * Setups the EEPROM for reading and writing.
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424 | **/
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425 | void EEPROMTest::getReady()
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426 | {
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427 | unsigned wires = eeprom->read();
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428 | /* Clear SK and DI */
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429 | eeprom->write(wires &= ~(DI | SK));
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430 | /* Set CS */
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431 | eeprom->write(wires | CS);
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432 | }
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433 |
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434 | /**
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435 | * standby - Return EEPROM to standby state
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436 | *
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437 | * Return the EEPROM to a standby state.
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438 | **/
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439 | void EEPROMTest::standby()
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440 | {
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441 | unsigned wires = eeprom->read();
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442 |
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443 | eeprom->write(wires &= ~(CS | SK));
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444 |
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445 | // Raise clock
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446 | eeprom->write(wires |= SK);
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447 |
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448 | // Select EEPROM
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449 | eeprom->write(wires |= CS);
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450 |
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451 | // Lower clock
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452 | eeprom->write(wires &= ~SK);
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453 | }
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454 |
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455 | /**
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456 | * stop - Terminate EEPROM command
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457 | *
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458 | * Terminates the current command by inverting the EEPROM's chip select pin.
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459 | **/
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460 | void EEPROMTest::stop()
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461 | {
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462 | unsigned wires = eeprom->read();
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463 |
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464 | eeprom->write(wires &= ~(CS | DI));
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465 | // Raise clock
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466 | eeprom->write(wires |= SK);
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467 | // Lower clock
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468 | eeprom->write(wires &= ~SK);
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469 | }
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470 |
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471 | /**
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472 | * readAt - Read a word at specified address
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473 | * @addr: address to read
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474 | *
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475 | * Returns the value of the word specified in 'addr' parameter.
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476 | **/
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477 | uint16_t EEPROMTest::readAt(uint16_t addr)
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478 | {
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479 | getReady();
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480 | shiftOutBits(READ_OPCODE, READ_OPCODE_BITS);
|
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481 | shiftOutBits(addr, READ_ADDR_BITS);
|
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482 |
|
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483 | uint16_t value = shiftInBits(DATA_BITS);
|
---|
484 | stop();
|
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485 |
|
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486 | return value;
|
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487 | }
|
---|
488 |
|
---|
489 | /**
|
---|
490 | * writeTo - Write a word to specified address
|
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491 | * @addr: address to write to
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492 | * @value: value to store
|
---|
493 | *
|
---|
494 | * Returns false if write did not complete.
|
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495 | *
|
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496 | * Note: Make sure EEPROM is selected and writable before attempting
|
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497 | * to write. Use getReady() and stop() to select/deselect
|
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498 | * EEPROM.
|
---|
499 | **/
|
---|
500 | bool EEPROMTest::writeTo(uint16_t addr, uint16_t value)
|
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501 | {
|
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502 | writeOpAddr(WRITE_OPCODE, WRITE_OPCODE_BITS, addr, WRITE_ADDR_BITS);
|
---|
503 | writeData(value);
|
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504 | standby();
|
---|
505 | return waitForCompletion();
|
---|
506 | }
|
---|
507 |
|
---|
508 |
|
---|
509 | /**
|
---|
510 | * waitForCompletion - Wait until EEPROM clears the busy bit
|
---|
511 | *
|
---|
512 | * Returns false if the EEPROM is still busy.
|
---|
513 | */
|
---|
514 | bool EEPROMTest::waitForCompletion() {
|
---|
515 | for (int i = 0; i < 200; i++) {
|
---|
516 | if (eeprom->read() & DO) {
|
---|
517 | standby();
|
---|
518 | return true;
|
---|
519 | }
|
---|
520 | // Wait 50 usec;
|
---|
521 | }
|
---|
522 |
|
---|
523 | return false;
|
---|
524 | }
|
---|
525 |
|
---|
526 | /**
|
---|
527 | * writeOpAddr - Write an opcode and address
|
---|
528 | * @opCode: operation code
|
---|
529 | * @opCodeBits: number of bits in opCode
|
---|
530 | * @addr: address to write to
|
---|
531 | * @addrBits: number of bits in address
|
---|
532 | **/
|
---|
533 | void EEPROMTest::writeOpAddr(int opCode, int opCodeBits, uint16_t addr, int addrBits)
|
---|
534 | {
|
---|
535 | shiftOutBits(opCode, opCodeBits);
|
---|
536 | shiftOutBits(addr, addrBits);
|
---|
537 | }
|
---|
538 |
|
---|
539 | int main()
|
---|
540 | {
|
---|
541 | #ifdef USE_CPPUNIT
|
---|
542 | CppUnit::TextUi::TestRunner runner;
|
---|
543 | runner.addTest( EEPROMTest::suite() );
|
---|
544 | return runner.run() ? 0 : 1;
|
---|
545 | #else
|
---|
546 | EEPROMTest Test;
|
---|
547 | return Test.run();
|
---|
548 | #endif
|
---|
549 | }
|
---|
550 |
|
---|