樹莓派：光陰的故事

阿新 • • 發佈：2018-12-31

#!/bin/bash #======================================================================= # NAME: set_revision_var # DESCRIPTION: Stores the revision number of this Raspberry Pi into # $RPI_REVISION #======================================================================= set_revision_var() { revision

=$(grep "Revision" /proc/cpuinfo | sed -e "s/Revision\t: //") RPI2_REVISION=$((16#a01041)) RPI3_REVISION=$((16#a02082)) if [ "$((16#$revision))" -ge "$RPI3_REVISION" ]; then RPI_REVISION="3" elif [ "$((16#$revision))" -ge "$RPI2_REVISION" ]; then RPI_REVISION="2" else

RPI_REVISION="1" fi } #======================================================================= # NAME: start_on_boot # DESCRIPTION: Load the I2C modules and send magic number to RTC, on boot. #======================================================================= start_on_boot() {

echo "[info]Create a new pifacertc init script to load time from PiFace RTC." echo "[info]Adding /etc/init.d/pifacertc ." if [[ $RPI_REVISION == "3" ]]; then i=1 # i2c-1 elif [[ $RPI_REVISION == "2" ]]; then i=1 # i2c-1 else i=0 # i2c-0 fi cat > /etc/init.d/pifacertc << EOF #!/bin/sh ### BEGIN INIT INFO # Provides: pifacertc # Required-Start: udev mountkernfs \$remote_fs raspi-config # Required-Stop: # Default-Start: S # Default-Stop: # Short-Description: Add the PiFace RTC # Description: Add the PiFace RTC ### END INIT INFO . /lib/lsb/init-functions case "\$1" in start) log_success_msg "Probe the i2c-dev" modprobe i2c-dev # Calibrate the clock (default: 0x47). See datasheet for MCP7940N log_success_msg "Calibrate the clock" i2cset -y $i 0x6f 0x08 0x47 log_success_msg "Probe the mcp7941x driver" modprobe i2c:mcp7941x log_success_msg "Add the mcp7941x device in the sys filesystem" # https://www.kernel.org/doc/Documentation/i2c/instantiating-devices echo mcp7941x 0x6f > /sys/class/i2c-dev/i2c-$i/device/new_device log_success_msg "Synchronise the system clock and hardware RTC" hwclock --hctosys ;; stop) ;; restart) ;; force-reload) ;; *) echo "Usage: \$0 start" >&2 exit 3 ;; esac EOF chmod +x /etc/init.d/pifacertc echo "[info]Install the pifacertc init script" update-rc.d pifacertc defaults } set_revision_var && start_on_boot

樹莓派：光陰的故事

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樹莓派：光陰的故事

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