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Both sides previous revision Previous revision Next revision | Previous revision | ||
en:c2_hardware_1w [2016/05/10 16:59] ck.kim |
en:c2_hardware_1w [2017/05/04 20:22] (current) odroid |
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- | ===== 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 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)** | Default GPIO for 1-Wire is **Pin #7 (GPIOX.BIT21)** | ||
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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.\\ | ||
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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 (-) | ||
- | Pin 2 (Middle): Pin #11 C2 (GPIOX_19, GPIO111) | + | Pin 2 (Middle): Pin #11 C2 (GPIOX.BIT19) |
Pin 3 (Right): Ground (-) | Pin 3 (Right): Ground (-) | ||