Rtc
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Load the I2C and RTC drivers as root:
sudo -s modprobe i2c-dev modprobe i2c:mcp7941x echo mcp7941x 0x6f > /sys/class/i2c-dev/i2c-0/device/new_device # For rev1 RPi echo mcp7941x 0x6f > /sys/class/i2c-dev/i2c-1/device/new_device # For rev2 RPi
To write the system time to the RTC (you might need to run this command twice, when you use the RTC for the first time):
hwclock -w
Read out the RTC, and print the date and time to your console:
hwclock
Read out the RTC, and adjust system time:
hwclock -s
To automatically do this on startup, add the following lines to /etc/rc.d/rc.local
modprobe i2c-dev modprobe i2c:mcp7941x echo mcp7941x 0x6f > /sys/class/i2c-dev/i2c-0/device/new_device # For rev1 RPi echo mcp7941x 0x6f > /sys/class/i2c-dev/i2c-1/device/new_device # For rev2 RPi hwclock -s