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en:c2_hardware_1w [2016/05/10 17:00] ck.kim |
en:c2_hardware_1w [2016/11/14 15:10] odroid [Change the Default GPIO pin for 1-Wire interface] |
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Two sensors in parallel. | 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 \\ | Ex) Default GPIO pin change to GPIOX.BIT19 \\ | ||
Please refer to below links for details related to gpio mapping in the device-tree.\\ | Please refer to below links for details related to gpio mapping in the device-tree.\\ | ||
Line 67: | Line 67: | ||
odroid@odroid64:~$ sudo apt-get install device-tree-compiler | odroid@odroid64:~$ sudo apt-get install device-tree-compiler | ||
odroid@odroid64:~$ fdtget /media/boot/meson64_odroidc2.dtb /onewire gpios | odroid@odroid64:~$ fdtget /media/boot/meson64_odroidc2.dtb /onewire gpios | ||
- | 31 113 0 | + | 18 113 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 | odroid@odroid64:~$ fdtget /media/boot/meson64_odroidc2.dtb /onewire gpios | ||
- | 31 111 0 | + | 18 111 0 |
odroid@odroid64:~$ sudo reboot | odroid@odroid64:~$ sudo reboot | ||
</code> | </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 1 (Left): Ground (-) |