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CC1101 Onewire Clock Installation

Mounting


Onewire

Make sure i2c is active! You need to add to /boot/config.txt:
dtparam=i2c_arm=on

load (you may add module to /etc/modules) or:
sudo modprobe i2c_dev


To access the 1Wire bus do:
sudo apt-get install owfs


edit /etc/owfs.conf to:
#server: FAKE = DS18S20,DS2405
server: i2c = ALL:ALL


restart service and have a look:
sudo /etc/init.d/owserver restart
sudo /etc/init.d/owhttpd restart
  1. browse to http://ip_or_raspberry:2121
sudo owfs --i2c=ALL:ALL --allow_other /mnt/
ls /mnt

RTC

The extension ist equipped with an backed up Real Time Clock. It stores its energy in an on-board supercapacitor. This will last for about 3 days.
access the RTC by:
sudo echo ds1307 0x68 > /sys/class/i2c-adapter/i2c-1/new_device
sleep 2
sudo hwclock

setting RTC by:
sudo hwclock -w

set system time from RTC during startup (i.e. in /etc/rc.local):
sudo hwclock -s

Than let Raspberry know that we have a real-Time-clock:
sudo apt-get remove fake-hwclock
sudo rm /etc/cron.hourly/fake-hwclock
sudo update-rc.d -f fake-hwclock remove
sudo rm /etc/init.d/fake-hwclock
sudo update-rc.d hwclock.sh enable

Modul connector

RPis serial port /dev/ttyAMA0 is directly connected to modul. Other assignments as below:


RPI3 + JESSIE:

add to:
/boot/config.txt
dtoverlay=pi3-miniuart-bt

change:
/boot/cmdline.txt
dwc_otg.lpm_enable=0 console=tty1 root=/dev/mmcblk0p2 rootfstype=ext4 elevator=deadline fsck.repair=yes rootwait

commands to issue:
sudo systemctl stop serial-getty@ttyAMA0.service
sudo systemctl disable serial-getty@ttyAMA0.service
sudo reboot


This modules uses Low-Level? RESET pin. To enable those you must pull RESET HIGH by doing:
sudo echo 22 > /sys/class/gpio/export
sudo echo out > /sys/class/gpio/gpio22/direction
sudo echo 1 > /sys/class/gpio/gpio22/value

EEPROM

The configuration EEPROMs are available at:
  • PIGATOR board EEPROM -> sudo hexdump /sys/class/i2c-adapter/i2c-1/1-0057/eeprom
  • MODUL SLOT EEPROM -> sudo hexdump /sys/class/i2c-adapter/i2c-1/1-0050/eeprom
The EEPROMs are write protected, programmed at manufacture - but currently mostly empty...
You might need to load proper kernel driver before accessing the EEPROMs:
echo "24c02 0x50" > /sys/class/i2c-adapter/i2c-1/new_device
echo "24c02 0x57" > /sys/class/i2c-adapter/i2c-1/new_device

Created by: tostmann last modification: Thursday 01 of December, 2016 [12:04:54 UTC] by tostmann


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