/* Reflow Oven Controller
*
* Copyright (C) 2021 Mario Hüttel <mario.huettel@gmx.net>
*
* This file is part of the Reflow Oven Controller Project.
*
* The reflow oven controller is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* The Reflow Oven Control Firmware 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 the reflow oven controller project.
* If not, see <http://www.gnu.org/licenses/>.
*/

#ifndef __SETTINGS_SPI_EEPROM_H__
#define __SETTINGS_SPI_EEPROM_H__

#include <stdint.h>
#include <stdbool.h>

/**
 * @brief Initialize the SPI for the eeprom.
 * @return 0 if succesful
 */
int spi_eeprom_init();

/**
 * @brief Uninitialize the SPI EEPROM
 */
void spi_eeprom_deinit();

/**
 * @brief Read from SPI EEPROM
 * @param addr address to read from
 * @param rx_buff buffer to write data to
 * @param count Amount of bytes to read
 * @return  0 if successful
 */
int spi_eeprom_read(uint32_t addr, uint8_t *rx_buff, uint32_t count);

/**
 * @brief Check if the EEPROM is currently performing a write and therefore cannot serve other requests
 * @return true: Write in Progress, false: No write active
 */
bool spi_eeprom_write_in_progress(void);

/**
 * @brief Write data to the EEPROM
 * @param addr Address to write to
 * @param data Data to write
 * @param count Amount of bytes to write
 * @return 0 if successful
 * @note The page handling of the EEPROM is done internally. When using this function there is no need to worry about
 * the 16 byte page boundaries of the EEPROM
 */
int spi_eeprom_write(uint32_t addr, const uint8_t *data, uint32_t count);

/**
 * @brief Read the status register of the EEPROM
 * @return status register
 */
uint8_t spi_eeprom_read_status_reg(void);

/**
 * @brief Check if an EEPROM is connected to the SPI.
 *
 * This is done by trying to set the write enable latch in the status register and reading it back.
 * After it has been set, it is immediately reset.
 *
 * If it can't be read back, no EEPROM is connected
 *
 * @return true: EEPROM is connected, false: No (compatible) EEPROM found
 */
bool spi_eeprom_check_connected(void);

#endif /* __SETTINGS_SPI_EEPROM_H__ */