Differences
This shows you the differences between two versions of the page.
Both sides previous revision Previous revision Next revision | Previous revision Last revision Both sides next revision | ||
en:c2_hardware_1w [2016/05/11 08:38] odroid |
en:c2_hardware_1w [2017/05/04 18:46] 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. | * 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. | * 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 edit **/etc/modprobe.d/blacklist-odroid.conf** file to enable the 1-wire driver because the driver exists in the blacklist by default. | ||
+ | </WRAP> | ||
+ | \\ | ||
+ | \\ | ||
+ | \\ | ||
+ | \\ | ||
+ | \\ | ||
+ | \\ | ||
Default GPIO for 1-Wire is **Pin #7 (GPIOX.BIT21)** | Default GPIO for 1-Wire is **Pin #7 (GPIOX.BIT21)** | ||
Line 59: | Line 68: | ||
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 76: | ||
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). | + | 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 | DS1820 is connected to Pin #11 |