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--- en:xu4_hardware_1wire [2017/07/13 13:42]
ck.kim created
+++ en:xu4_hardware_1wire [2017/07/17 10:48] (current)
luke.go
@@ Line 1: / Line 1: @@
 ====== Dallas 1-Wire Support ======
-  * Support for Dallas 1 Wire is included on Kernel 3.14.29-29 and upwards. Make sure you are updated.
+  * Support for Dallas 1 Wire is included on Kernel 4.9.34 and upwards. Make sure you are updated.
   * Will cover an example of a temperature sensor well known **DS1820** other 1 wire IC's are supported too.
+Default GPIO for 1-Wire is **Pin #26 XE.INT16 (GPX2.0)**
 <WRAP left round tip 70%>
-You have to check **/etc/modprobe.d/w1_gpio.conf** file to enable the 1-wire driver.
+XU3 / XU4 CON10(30 pin) All GPIO and AIN pins use VDD_IO (1.8V) for the signals. \\
+So the level converter is required to connect the sensor.
+Hardkernel Shifter-Shield is not working well with multiple 1-wire devices due to a timing issue.\\
+So we used Sparkfun [[https://www.sparkfun.com/products/12009|Level converter board]]
 </WRAP>
-\\
-\\
-\\
 \\
 \\
 \\
-Default GPIO for 1-Wire is **Pin #7 (GPIOX.BIT21)**
+{{:en:1-wire_with_level_converter.png?750|}}
+  * **Connection: Level converter**
+CON10 Pin 1 (P5V0): Level converter HV \\
+CON10 Pin 2 (GND): Level converter GND \\
+CON10 Pin 29 (VDD_IO): Level converter LV \\
+CON10 Pin 30 (GND): Level converter GND \\
+CON10 Pin 26 (XE.INT16): Level converter LV1 \\
+Sensor signal : Level converter HV1 \\
+{{:en:level_shifter.jpg?nolink|}}
   * **Connection: With External-Supply**
 {{:en:1-wire-external-power.png?750|}}
-Pin 1 (Left): Ground (-)
+Pin 1 (Left): Ground (-) \\
+Pin 2 (Middle): Level converter HV1 \\
-Pin 2 (Middle): Pin #7 C2 (GPIOX.BIT21)
+Pin 3 (Right): VCC (3.3V) \\
-Pin 3 (Right): VCC (3.3V)
 You also need to add a resistor from 4.7k to 10k between pin 2.
@@ Line 30: / Line 40: @@
 {{:en:1-wire-parasite-power.png?750|}}
-Pin 1 (Left): Ground (-)
+Pin 1 (Left): Ground (-) \\
+Pin 2 (Middle): Level converter HV1 \\
-Pin 2 (Middle): Pin #7 C2 (GPIOX.BIT21)
+Pin 3 (Right): Ground (-) \\
-Pin 3 (Right): Ground (-)
 You also need to add a resistor from 4.7k to 10k between pin 2.
   * Load the required kernel modules: <code>modprobe w1-gpio && modprobe w1-therm</code>
-  * Check if your sensor is working: <code>odroid@odroid64:~$ cd /sys/bus/w1/devices/
+  * Check if your sensor is working: <code>
-odroid@odroid64:/sys/bus/w1/devices# ls
+odroid@odroid:~$ cd /sys/bus/w1/devices/
--000802f41d67  w1_bus_master1
+odroid@odroid:/sys/bus/w1/devices$ ls
-odroid@odroid64:/sys/bus/w1/devices#</code>
+-000802f3be04  w1_bus_master1
+odroid@odroid:/sys/bus/w1/devices$
+</code>
-As you can see my sensor is detected as **10-000802f38c57**, each sensor has a different id. So yours will be different.
+As you can see my sensor is detected as **10-000802f3be04**, each sensor has a different id. So yours will be different.
-  * Read the temperature:
+  * Read the temperature: <code>
-<code>
+odroid@odroid:/sys/bus/w1/devices$ cd 10-000802f3be04
-odroid@odroid64:/sys/bus/w1/devices$ cd 10-000802f38c57
+odroid@odroid:/sys/bus/w1/devices/10-000802f3be04$ cat w1_slave
-odroid@odroid64:/sys/bus/w1/devices/10-000802f38c57# cat w1_slave
+ 00 4b 46 ff ff 06 10 da : crc=da YES
- 00 4b 46 ff ff 03 10 30 : crc=30 YES
+ 00 4b 46 ff ff 06 10 da t=27375
- 00 4b 46 ff ff 03 10 30 t=25562
+odroid@odroid:/sys/bus/w1/devices/10-000802f3be04$
-odroid@odroid64:/sys/bus/w1/devices/10-000802f38c57#
 </code>
-Temperature is t=25562 or 25.562 degree's Celsius.
+Temperature is t=27375 or 27.375 degree's Celsius.
@@ Line 63: / Line 72: @@
 <code>
-odroid@odroid64:/sys/bus/w1/devices# ls
+odroid@odroid:/sys/bus/w1/devices$ ls
--000802f38c57  10-000802f41d67  w1_bus_master1
+-000802f384e2  10-000802f3be04  w1_bus_master1
+odroid@odroid:/sys/bus/w1/devices$
 </code>
 Two sensors in parallel.
-====== Change the Default GPIO pin for 1-Wire interface ======
-Ex) Default GPIO pin change to GPIOX.BIT19 \\
-Please refer to below links for details related to gpio mapping in the device-tree.\\
-[[https://github.com/hardkernel/linux/blob/odroidc2-3.14.y/include/dt-bindings/gpio/gxbb.h | C2 gpio mapping in the device-tree]] \\
-<code>
-odroid@odroid64:~$ sudo apt-get install device-tree-compiler
-odroid@odroid64:~$ fdtget /media/boot/meson64_odroidc2.dtb /onewire gpios
-113 0
-odroid@odroid64:~$ fdtput /media/boot/meson64_odroidc2.dtb /onewire gpios 18 111 0
-odroid@odroid64:~$ fdtget /media/boot/meson64_odroidc2.dtb /onewire gpios
-111 0
-odroid@odroid64:~$ sudo reboot
-</code>
-If the reboot doesn't affect the dtb update, you need a hard reset(power off/on).\\
-**Use the first number in the fdtget command output when you run fdtput command. For example, 18(0x12) is the GPIO group number.**
-DS1820 is connected to Pin #11
-Pin 1 (Left): Ground (-)
-Pin 2 (Middle): Pin #11 C2 (GPIOX.BIT19)
-Pin 3 (Right): Ground (-)