/*
* stm-rtc.h
* ---------
* Functions and defines to use the externally connected RTC chip.
*
* Copyright (c) 2015-2016, NORDUnet A/S All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
* - Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* - Neither the name of the NORDUnet nor the names of its contributors may
* be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef __STM32_RTC_H
#define __STM32_RTC_H
#include "stm32f4xx_hal.h"
extern void rtc_init(void);
extern HAL_StatusTypeDef rtc_device_ready(uint16_t i2c_addr);
extern HAL_StatusTypeDef rtc_enable_oscillator();
extern HAL_StatusTypeDef rtc_send_byte(const uint16_t i2c_addr, const uint8_t value, const uint16_t timeout);
extern HAL_StatusTypeDef rtc_read_bytes (const uint16_t i2c_addr, uint8_t *buf, const uint8_t len, const uint16_t timeout);
#define RTC_RTC_ADDR 0xdf
#define RTC_EEPROM_ADDR 0xaf
#define RTC_RTC_ADDR_W RTC_RTC_ADDR ^ 1 /* turn off LSB to write */
#define RTC_EEPROM_ADDR_W RTC_EEPROM_ADDR ^ 1 /* turn off LSB to write */
#define RTC_SRAM_TOTAL_BYTES 0x5f
#define RTC_EEPROM_TOTAL_BYTES 0x7f
#define RTC_EEPROM_EUI48_OFFSET 0xf0
#define RTC_EEPROM_EUI48_BYTES 8
#define RTC_TIME_OFFSET 0x0 /* Time is at offest 0 in SRAM */
#define RTC_TIME_BYTES 8
#endif /* __STM32_RTC_H */
