eepj / stm32-ds1307

An STM32 HAL library for the DS1307 real-time clock IC.

DS1307_for_STM32_HAL

An STM32 HAL library for the DS1307 real-time clock IC.

To test

• Minimal setup:

                                             _________
                       32.768 kHz XTAL1 1 --| o       |-- 8 VDD
                       32.768 kHz XTAL2 2 --|         |-- 7 N/C
                                    N/C 3 --|         |-- 6 SCL1
                                    GND 4 --|_________|-- 5 SDA1
 

• In STM32CubeIDE, include ds1307_for_stm32_hal.h and ds1307_for_stm32_hal.c.
• Complie and flash main.c in ./examples to microcontroller.
• Read the results from a UART monitor.
• Refer to datasheets for further information.

Note

• Avoid writing to registers 00h to 10h as those are reserved for this library.

Known issues

• Day of week fails to update at mindnight on March 1, 2020. This does not appear to recur in any other leap year.