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m24m01.c
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m24m01.c
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/* Copyright 2019 Raphael Randschau
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "wait.h"
#include "oled.h"
#include "i2c_master.h"
#include "m24m01.h"
#include "print.h"
#include "debug.h"
// write address: 0xA0
// read address: 0x50
#define EEPROM_PAGESIZE 128
uint8_t init_m24m01(void) {
palSetPadMode(M24M01_WC_PAD, M24M01_WC_PIN, PAL_MODE_OUTPUT_PUSHPULL);
// palClearPad(M24M01_WC_PAD, M24M01_WC_PIN);
palSetPad(M24M01_WC_PAD, M24M01_WC_PIN);
return i2c2_isDeviceReady(EEPROM_ADDRESS, EEPROM_LONG_TIMEOUT);
}
uint8_t m24m01_byte_read(uint8_t address, uint8_t *data) {
uint8_t status = i2c2_receive((address<<1)|1, data, 1, EEPROM_LONG_TIMEOUT);
i2c2_stop();
return status;
}
uint8_t m24m01_page_read(uint8_t address, uint16_t eepromAddr, uint8_t*data, uint16_t length)
{
uint8_t location[2] = {(eepromAddr >> 8) & 0x00FF, (eepromAddr & 0x00FF)};
uint8_t status = i2c2_transceive((address<<1), &location[0], 2, &data[0], length, EEPROM_LONG_TIMEOUT);
i2c2_stop();
return status;
}
uint8_t m24m01_page_write(uint8_t address, uint16_t eepromAddr, const uint8_t *data, uint16_t length)
{
palClearPad(M24M01_WC_PAD, M24M01_WC_PIN);
wait_ms(6);
uint8_t complete_packet[length + 2];
for (uint8_t i = 0; i < length; i++) {
complete_packet[i + 2] = data[i];
}
complete_packet[0] = (eepromAddr >> 8) & 0x00FF;
complete_packet[1] = (eepromAddr & 0x00FF);
uint8_t writeAddress = address << 1;
uint8_t status = i2c2_transmit(writeAddress, &complete_packet[0], length+2, EEPROM_LONG_TIMEOUT);
i2c2_stop();
palSetPad(M24M01_WC_PAD, M24M01_WC_PIN);
return status;
}
uint8_t m24m01_buffer_write(uint8_t address, uint16_t eepromAddr, const uint8_t *data, uint16_t length) {
// uint16_t numofpage = 0, numofsingle = 0, count = 0;
// uint16_t addr = 0;
// uint32_t dataindex = 0;
// uint32_t status = EEPROM_OK;
// addr = WriteAddr % EEPROMPageSize;
// count = EEPROMPageSize - addr;
// numofpage = NumByteToWrite / EEPROMPageSize;
// numofsingle = NumByteToWrite % EEPROMPageSize;
// /*!< If WriteAddr is EEPROM_PAGESIZE aligned */
// if(addr == 0)
// {
// /*!< If NumByteToWrite < EEPROM_PAGESIZE */
// if(numofpage == 0)
// {
// /* Store the number of data to be written */
// dataindex = numofsingle;
// /* Start writing data */
// status = EEPROM_WritePage(pBuffer, WriteAddr, (uint32_t*)(&dataindex));
// if (status != EEPROM_OK)
// {
// return status;
// }
// }
// /*!< If NumByteToWrite > EEPROM_PAGESIZE */
// else
// {
// while(numofpage--)
// {
// /* Store the number of data to be written */
// dataindex = EEPROMPageSize;
// status = EEPROM_WritePage(pBuffer, WriteAddr, (uint32_t*)(&dataindex));
// if (status != EEPROM_OK)
// {
// return status;
// }
// WriteAddr += EEPROMPageSize;
// pBuffer += EEPROMPageSize;
// }
// if(numofsingle!=0)
// {
// /* Store the number of data to be written */
// dataindex = numofsingle;
// status = EEPROM_WritePage(pBuffer, WriteAddr, (uint32_t*)(&dataindex));
// if (status != EEPROM_OK)
// {
// return status;
// }
// }
// }
// }
// /*!< If WriteAddr is not EEPROM_PAGESIZE aligned */
// else
// {
// /*!< If NumByteToWrite < EEPROM_PAGESIZE */
// if(numofpage== 0)
// {
// /*!< If the number of data to be written is more than the remaining space
// in the current page: */
// if (NumByteToWrite > count)
// {
// /* Store the number of data to be written */
// dataindex = count;
// /*!< Write the data contained in same page */
// status = EEPROM_WritePage(pBuffer, WriteAddr, (uint32_t*)(&dataindex));
// if (status != EEPROM_OK)
// {
// return status;
// }
// /* Store the number of data to be written */
// dataindex = (NumByteToWrite - count);
// /*!< Write the remaining data in the following page */
// status = EEPROM_WritePage((uint8_t*)(pBuffer + count), (WriteAddr + count), (uint32_t*)(&dataindex));
// if (status != EEPROM_OK)
// {
// return status;
// }
// }
// else
// {
// /* Store the number of data to be written */
// dataindex = numofsingle;
// status = EEPROM_WritePage(pBuffer, WriteAddr, (uint32_t*)(&dataindex));
// if (status != EEPROM_OK)
// {
// return status;
// }
// }
// }
// /*!< If NumByteToWrite > EEPROM_PAGESIZE */
// else
// {
// NumByteToWrite -= count;
// numofpage = NumByteToWrite / EEPROMPageSize;
// numofsingle = NumByteToWrite % EEPROMPageSize;
// if(count != 0)
// {
// /* Store the number of data to be written */
// dataindex = count;
// status = EEPROM_WritePage(pBuffer, WriteAddr, (uint32_t*)(&dataindex));
// if (status != EEPROM_OK)
// {
// return status;
// }
// WriteAddr += count;
// pBuffer += count;
// }
// while(numofpage--)
// {
// /* Store the number of data to be written */
// dataindex = EEPROMPageSize;
// status = EEPROM_WritePage(pBuffer, WriteAddr, (uint32_t*)(&dataindex));
// if (status != EEPROM_OK)
// {
// return status;
// }
// WriteAddr += EEPROMPageSize;
// pBuffer += EEPROMPageSize;
// }
// if(numofsingle != 0)
// {
// /* Store the number of data to be written */
// dataindex = numofsingle;
// status = EEPROM_WritePage(pBuffer, WriteAddr, (uint32_t*)(&dataindex));
// if (status != EEPROM_OK)
// {
// return status;
// }
// }
// }
// }
return 0;
}
uint8_t m24m01_random_byte_read(uint8_t address, uint16_t eepromAddr, uint8_t *data) {
const uint8_t location[2] = {(eepromAddr >> 8) & 0x00FF, (eepromAddr & 0x00FF)};
uint8_t status = i2c2_transmit((address<<1), &location[0], 2, EEPROM_LONG_TIMEOUT);
status = i2c2_receive((address<<1)|1, data, 1, EEPROM_LONG_TIMEOUT);
i2c2_stop();
return status;
}
uint8_t m24m01_byte_write(uint8_t address, uint16_t eepromAddr, uint8_t data) {
const uint8_t location_and_byte[3] = {(eepromAddr >> 8) & 0x00FF, (eepromAddr & 0x00FF), data};
palClearPad(M24M01_WC_PAD, M24M01_WC_PIN);
uint8_t status = i2c2_transmit(address<<1, &location_and_byte[0], 3, EEPROM_LONG_TIMEOUT);
i2c2_stop();
palSetPad(M24M01_WC_PAD, M24M01_WC_PIN);
// this is a hack - waiting until the device is ready should be done instead
wait_ms(6);
return status;
}