Differences

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--- en:c2_hardware_1w [2016/05/10 16:59]
ck.kim
+++ en:c2_hardware_1w [2017/05/04 20:22] (current)
odroid
@@ Line 1: / Line 1: @@
-===== Dallas 1-Wire Support =====
+====== Dallas 1-Wire Support ======
   * Support for Dallas 1 Wire is included on Kernel 3.14.29-29 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.
+<WRAP left round tip 70%>
+You have to check **/etc/modprobe.d/w1_gpio.conf** file to enable the 1-wire driver.
+</WRAP>
+\\
+\\
+\\
+\\
+\\
+\\
 Default GPIO for 1-Wire is **Pin #7 (GPIOX.BIT21)**
@@ Line 59: / Line 68: @@
 Two sensors in parallel.
-**Change the Default GPIO pin for 1-Wire interface** \\
+====== 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.\\
@@ Line 67: / Line 76: @@
 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 31 111 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).\\
-DS1820 change to connection Pin #11
+**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_19, GPIO111)
+Pin 2 (Middle): Pin #11 C2 (GPIOX.BIT19)
 Pin 3 (Right): Ground (-)