DS3231 RTC Driver for CH32

Bit-banged I2C driver and UART configuration tool for DS3231 RTC on CH32 microcontrollers.

Wiring

DS3231	CH32
SDA	PC1
SCL	PC2

Features

• Read/set time and date
• Aging offset calibration
• Temperature reading
• Square wave output configuration
• Continuous display mode

Build

make
make flash

Usage

Connect via serial (115200 baud) and use the menu:

• r - Read date/time
• t - Set time (HH:MM:SS)
• d - Set date (YYYY-MM-DD)
• a - Set aging offset
• g - Get aging offset
• e - Temperature
• c - Continuous display
• s - SQW configuration

Python Helper

python set_rtc_time_precise.py /dev/ttyUSB0

Syncs RTC to system time with sub-second precision.