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Diffstat (limited to 'stm-rtc.h')
| -rw-r--r-- | stm-rtc.h | 62 |
1 files changed, 62 insertions, 0 deletions
diff --git a/stm-rtc.h b/stm-rtc.h new file mode 100644 index 0000000..edbed9d --- /dev/null +++ b/stm-rtc.h @@ -0,0 +1,62 @@ +/* + * 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 I2C_HandleTypeDef hi2c_rtc; + +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 */ |