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| /**************************************************************************//** |
| * \brief EEPROM 24C04/24C08/24C16 library. |
| * \author Copyright (C) 2012 Julien Le Sech - www.idreammicro.com |
| * \version 1.0 |
| * \date 20121102 |
| * |
| * This file is part of the iDreamMicro library. |
| * |
| * This library is free software: you can redistribute it and/or modify it under |
| * the terms of the GNU Lesser General Public License as published by the Free |
| * Software Foundation, either version 3 of the License, or (at your option) any |
| * later version. |
| * |
| * This library is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS |
| * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more |
| * details. |
| * |
| * You should have received a copy of the GNU Lesser General Public License |
| * along with this program. If not, see http://www.gnu.org/licenses/ |
| ******************************************************************************/ |
| |
| /**************************************************************************//** |
| * \file eeprom_24c04_24c16.c |
| ******************************************************************************/ |
| |
| /****************************************************************************** |
| * Header file inclusions. |
| ******************************************************************************/ |
| |
| #include "../eeprom_24c04_24c16.h" |
| |
| #include <twi/twi.h> |
| |
| #include <util/delay.h> |
| |
| #include <assert.h> |
| #include <stdint.h> |
| #include <stdlib.h> |
| |
| /****************************************************************************** |
| * Private macro definitions. |
| ******************************************************************************/ |
| |
| /**************************************************************************//** |
| * \def EEPROM_24C04_24C16__ADDRESS |
| * \brief EEPROM 24C04/24C08/24C16 address. Given by datasheet. |
| ******************************************************************************/ |
| #define EEPROM_24C04_24C16__ADDRESS 0xA0 |
| |
| /**************************************************************************//** |
| * \def EEPROM_24C04_24C16__PAGE_SIZE |
| * \brief Size of a page in EEPROM memory. |
| * This size is given by EEPROM memory datasheet. |
| ******************************************************************************/ |
| #define EEPROM_24C04_24C16__PAGE_SIZE 16 |
| |
| /****************************************************************************** |
| * Private function prototypes. |
| ******************************************************************************/ |
| |
| /**************************************************************************//** |
| * \fn static void eeprom_24c04_24c16__write_page( |
| * uint16_t address, |
| * uint8_t length, |
| * uint8_t* p_data) |
| * |
| * \brief Write a page in memory. |
| * |
| * \param address Start address of data to write. |
| * \param length Number of bytes to write. |
| * \param[in] p_data Bytes to write. |
| ******************************************************************************/ |
| static |
| void |
| eeprom_24c04_24c16__write_page |
| ( |
| uint16_t address, |
| uint8_t length, |
| uint8_t* p_data |
| ); |
| |
| /****************************************************************************** |
| * Private variable declarations. |
| ******************************************************************************/ |
| |
| static uint8_t device_address = 0; |
| |
| /****************************************************************************** |
| * Public function definitions. |
| ******************************************************************************/ |
| |
| /**************************************************************************//** |
| * \fn void eeprom_24c04_24c16__initialize(uint8_t hardware_address) |
| * |
| * \brief Initialize EEPROM 24C04/24C08/24C16. |
| * |
| * \param hardware_address Hardware address. Pins A1 to A2. |
| ******************************************************************************/ |
| void |
| eeprom_24c04_24c16__initialize |
| ( |
| uint8_t hardware_address |
| ){ |
| // Compute device address. |
| device_address = EEPROM_24C04_24C16__ADDRESS | ((hardware_address & 0x06) << 1); |
| |
| // We don't initialize TWI here: we may have several devices on the bus. |
| // Initialize TWI. |
| //twi__initialize(EEPROM_24C04_24C16__CLOCK_RATE); |
| } |
| |
| /**************************************************************************//** |
| * \fn void eeprom_24c04_24c16__write_byte(uint16_t address, uint8_t data) |
| * |
| * \brief Write a byte into memory. |
| * |
| * \param address Address in memory. |
| * \param data Byte to write. |
| ******************************************************************************/ |
| void |
| eeprom_24c04_24c16__write_byte |
| ( |
| uint16_t address, |
| uint8_t data |
| ){ |
| twi__start(); |
| twi__send_slaw(device_address | ((address & 0x30) >> 7)); |
| twi__send_data(address & 0xFF); |
| twi__send_data(data); |
| twi__stop(); |
| } |
| |
| /**************************************************************************//** |
| * \fn void eeprom_24c04_24c16__write_bytes( |
| * uint16_t address, |
| * uint16_t length, |
| * uint8_t* p_data) |
| * |
| * \brief Write bytes into memory. |
| * |
| * \param address Start address. |
| * \param length Number of bytes to write. |
| * \param[in] p_data Bytes to write. |
| ******************************************************************************/ |
| void |
| eeprom_24c04_24c16__write_bytes |
| ( |
| uint16_t address, |
| uint16_t length, |
| uint8_t* p_data |
| ){ |
| // Check the preconditions. |
| assert(NULL != p_data); |
| |
| // Write first page if not aligned. |
| uint8_t not_aligned_length = 0; |
| uint8_t page_offset = address % EEPROM_24C04_24C16__PAGE_SIZE; |
| if (page_offset > 0) |
| { |
| not_aligned_length = EEPROM_24C04_24C16__PAGE_SIZE - page_offset; |
| eeprom_24c04_24c16__write_page(address, not_aligned_length, p_data); |
| length -= not_aligned_length; |
| } |
| |
| if (length > 0) |
| { |
| address += not_aligned_length; |
| p_data += not_aligned_length; |
| |
| // Write complete and aligned pages. |
| uint16_t page_count = length / EEPROM_24C04_24C16__PAGE_SIZE; |
| for (uint16_t i = 0; i < page_count; i++) |
| { |
| eeprom_24c04_24c16__write_page(address, EEPROM_24C04_24C16__PAGE_SIZE, p_data); |
| address += EEPROM_24C04_24C16__PAGE_SIZE; |
| p_data += EEPROM_24C04_24C16__PAGE_SIZE; |
| length -= EEPROM_24C04_24C16__PAGE_SIZE; |
| } |
| |
| if (length > 0) |
| { |
| // Write remaining uncomplete page. |
| eeprom_24c04_24c16__write_page(address, EEPROM_24C04_24C16__PAGE_SIZE, p_data); |
| } |
| } |
| } |
| |
| /**************************************************************************//** |
| * \fn uint8_t eeprom_24c04_24c16__read_byte(uint16_t address) |
| * |
| * \brief Read a byte in memory. |
| * |
| * \param address Address to read. |
| * |
| * \return Read byte. |
| ******************************************************************************/ |
| uint8_t |
| eeprom_24c04_24c16__read_byte |
| ( |
| uint16_t address |
| ){ |
| uint8_t data = 0; |
| |
| twi__start(); |
| twi__send_slaw(device_address | ((address & 0x30) >> 7)); |
| twi__send_data(address & 0xFF); |
| twi__repeat_start(); |
| twi__send_slar(device_address); |
| twi__receive_data_nack(&data); |
| twi__stop(); |
| |
| return data; |
| } |
| |
| /**************************************************************************//** |
| * \fn void eeprom_24c04_24c16__read_bytes( |
| * uint16_t address, |
| * uint16_t length, |
| * uint8_t* p_data) |
| * |
| * \brief Read bytes in memory. |
| * |
| * \param address Start address of data to read. |
| * \param length Number of bytes to read. |
| * \param[in] p_data Buffer to fill with read bytes. |
| ******************************************************************************/ |
| void |
| eeprom_24c04_24c16__read_bytes |
| ( |
| uint16_t address, |
| uint16_t length, |
| uint8_t* p_data |
| ){ |
| // Check the preconditions. |
| assert(NULL != p_data); |
| |
| twi__start(); |
| twi__send_slaw(device_address | ((address & 0x30) >> 7)); |
| twi__send_data(address & 0xFF); |
| twi__repeat_start(); |
| twi__send_slar(device_address); |
| for (uint16_t i = 0; i < length - 1; i++) |
| { |
| twi__receive_data_ack(p_data + i); |
| } |
| twi__receive_data_nack(p_data + length - 1); |
| twi__stop(); |
| } |
| |
| /****************************************************************************** |
| * Private function definitions. |
| ******************************************************************************/ |
| |
| /**************************************************************************//** |
| * \fn static void eeprom_24c04_24c16__write_page( |
| * uint16_t address, |
| * uint8_t length, |
| * uint8_t* p_data) |
| * |
| * \brief Write a page in memory. |
| * |
| * \param address Start address of data to write. |
| * \param length Number of bytes to write. |
| * \param[in] p_data Bytes to write. |
| ******************************************************************************/ |
| static |
| void |
| eeprom_24c04_24c16__write_page |
| ( |
| uint16_t address, |
| uint8_t length, |
| uint8_t* p_data |
| ){ |
| // Check the preconditions. |
| assert(NULL != p_data); |
| |
| twi__start(); |
| twi__send_slaw(device_address | ((address & 0x30) >> 7)); |
| twi__send_data(address & 0xFF); |
| for (uint8_t i = 0; i < length; i++) |
| { |
| twi__send_data(p_data[i]); |
| } |
| twi__stop(); |
| |
| // Write cycle time (tWR). See EEPROM memory datasheet for more details. |
| _delay_ms(10); |
| } |