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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 65 | jlesech | 1 | /**************************************************************************//** |
| 2 | * \brief EEPROM library |
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| 3 | * \author Copyright (C) 2011 Julien Le Sech - www.idreammicro.com |
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| 4 | * \version 1.0 |
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| 5 | * \date 20111017 |
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| 6 | * |
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| 7 | * This file is part of the iDreamMicro library. |
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| 8 | * |
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| 9 | * This library is free software: you can redistribute it and/or modify it under |
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| 10 | * the terms of the GNU Lesser General Public License as published by the Free |
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| 11 | * Software Foundation, either version 3 of the License, or (at your option) any |
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| 12 | * later version. |
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| 13 | * |
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| 14 | * This library is distributed in the hope that it will be useful, but WITHOUT |
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| 15 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS |
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| 16 | * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more |
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| 17 | * details. |
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| 18 | * |
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| 19 | * You should have received a copy of the GNU Lesser General Public License |
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| 20 | * along with this program. If not, see http://www.gnu.org/licenses/ |
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| 21 | ******************************************************************************/ |
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| 22 | |||
| 23 | /**************************************************************************//** |
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| 24 | * \file eeprom.c |
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| 25 | ******************************************************************************/ |
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| 26 | |||
| 27 | /****************************************************************************** |
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| 28 | * Header file inclusions. |
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| 29 | ******************************************************************************/ |
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| 30 | |||
| 31 | #include <eeprom/eeprom.h> |
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| 32 | |||
| 33 | #include <avr/io.h> |
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| 34 | |||
| 35 | #include <assert.h> |
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| 36 | #include <stdint.h> |
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| 37 | #include <stdlib.h> |
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| 38 | |||
| 39 | /****************************************************************************** |
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| 40 | * Public function definitions. |
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| 41 | ******************************************************************************/ |
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| 42 | |||
| 43 | /**************************************************************************//** |
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| 44 | * \fn void eeprom__write_byte( |
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| 45 | * uint16_t address, |
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| 46 | * uint8_t data) |
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| 47 | * |
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| 48 | * \brief Write a byte in EEPROM. |
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| 49 | * |
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| 50 | * \param address Address. |
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| 51 | * \param data Data to write. |
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| 52 | ******************************************************************************/ |
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| 53 | void |
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| 54 | eeprom__write_byte |
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| 55 | ( |
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| 56 | uint16_t address, |
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| 57 | uint8_t data |
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| 58 | ){ |
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| 59 | // Wait for completion of previous write. |
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| 60 | while (EECR & (1 << EEPE)); |
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| 61 | |||
| 62 | // Set up address. |
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| 63 | EEAR = address; |
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| 64 | |||
| 65 | // Set up data. |
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| 66 | EEDR = data; |
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| 67 | |||
| 68 | // Write logical one to EEMPE. |
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| 69 | EECR |= (1 << EEMPE); |
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| 70 | |||
| 71 | // Start EEPROM write. |
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| 72 | EECR |= (1 << EEPE); |
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| 73 | } |
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| 74 | |||
| 75 | /**************************************************************************//** |
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| 76 | * \fn void eeprom__write_bytes( |
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| 77 | * uint16_t address, |
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| 78 | * uint16_t size, |
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| 79 | * uint8_t* p_data) |
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| 80 | * |
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| 81 | * \brief Write bytes into EEPOM. |
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| 82 | * |
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| 83 | * \param address Address. |
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| 84 | * \param size Data size. |
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| 85 | * \param[in] p_data Data to write. |
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| 86 | ******************************************************************************/ |
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| 87 | void |
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| 88 | eeprom__write_bytes |
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| 89 | ( |
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| 90 | uint16_t address, |
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| 91 | uint16_t size, |
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| 92 | uint8_t* p_data |
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| 93 | ){ |
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| 94 | // Check the preconditions. |
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| 95 | assert(NULL != p_data); |
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| 96 | |||
| 97 | for (uint16_t i = 0; i < size; i++) |
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| 98 | { |
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| 99 | eeprom__write_byte(address + i, p_data[i]); |
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| 100 | } |
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| 101 | } |
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| 102 | |||
| 103 | /**************************************************************************//** |
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| 104 | * \fn uint8_t eeprom__read_byte( |
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| 105 | * uint16_t address) |
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| 106 | * |
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| 107 | * \brief Read data into EEPROM. |
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| 108 | * |
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| 109 | * \param address Address of data to read. |
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| 110 | * |
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| 111 | * \return Read data. |
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| 112 | ******************************************************************************/ |
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| 113 | uint8_t |
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| 114 | eeprom__read_byte |
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| 115 | ( |
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| 116 | uint16_t address |
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| 117 | ){ |
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| 118 | // Wait for completion of previous write. |
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| 119 | while (EECR & (1 << EEPE)); |
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| 120 | |||
| 121 | // Set up address. |
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| 122 | EEAR = address; |
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| 123 | |||
| 124 | // Start EEPROM read. |
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| 125 | EECR |= (1 << EERE); |
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| 126 | |||
| 127 | // Read data register. |
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| 128 | uint8_t data = EEDR; |
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| 129 | |||
| 130 | return data; |
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| 131 | } |
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| 132 | |||
| 133 | /**************************************************************************//** |
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| 134 | * \fn void eeprom__read_bytes( |
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| 135 | * uint16_t address, |
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| 136 | * uint16_t size, |
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| 137 | * uint8_t* p_data) |
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| 138 | * |
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| 139 | * \brief Read bytes from EEPROM. |
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| 140 | * |
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| 141 | * \param address Address to read. |
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| 142 | * \param size Data size to read. |
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| 143 | * \param[in] p_data Data buffer. |
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| 144 | ******************************************************************************/ |
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| 145 | void |
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| 146 | eeprom__read_bytes |
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| 147 | ( |
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| 148 | uint16_t address, |
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| 149 | uint16_t size, |
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| 150 | uint8_t* p_data |
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| 151 | ){ |
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| 152 | // Check the preconditions. |
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| 153 | assert(NULL != p_data); |
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| 154 | |||
| 155 | for (uint16_t i = 0; i < size; i++) |
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| 156 | { |
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| 157 | p_data[i] = eeprom__read_byte(address + i); |
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| 158 | } |
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| 159 | } |