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en:xu4_hardware_1wire [2017/07/13 16:19] ck.kim [Dallas 1-Wire Support] |
en:xu4_hardware_1wire [2017/07/17 10:48] (current) luke.go |
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| <WRAP left round tip 70%> | <WRAP left round tip 70%> | ||
| - | XU3 / XU4 CON10(30 pin) All GPIO and AIN pins use VDD_IO (1.8V) for the signals. | + | XU3 / XU4 CON10(30 pin) All GPIO and AIN pins use VDD_IO (1.8V) for the signals. \\ |
| - | level converter is required to connect the sensor. | + | 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> | </WRAP> | ||
| - | \\ | ||
| - | \\ | ||
| \\ | \\ | ||
| \\ | \\ | ||
| Line 25: | Line 26: | ||
| CON10 Pin 26 (XE.INT16): Level converter LV1 \\ | CON10 Pin 26 (XE.INT16): Level converter LV1 \\ | ||
| Sensor signal : Level converter HV1 \\ | Sensor signal : Level converter HV1 \\ | ||
| + | {{:en:level_shifter.jpg?nolink|}} | ||
| * **Connection: With External-Supply** | * **Connection: With External-Supply** | ||
| Line 63: | Line 64: | ||
| </code> | </code> | ||
| - | Temperature is t=27375or 27.375 degree's Celsius. | + | Temperature is t=27375 or 27.375 degree's Celsius. |
| Line 76: | Line 77: | ||
| </code> | </code> | ||
| Two sensors in parallel. | 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 | ||
| - | 18 113 0 | ||
| - | odroid@odroid64:~$ fdtput /media/boot/meson64_odroidc2.dtb /onewire gpios 18 111 0 | ||
| - | odroid@odroid64:~$ fdtget /media/boot/meson64_odroidc2.dtb /onewire gpios | ||
| - | 18 111 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 (-) | ||
