[FL-3057] Allow use of any suitable pin for 1-Wire devices (#2350)

* Add 1-wire thermometer example app stub
* Working 1-wire thermometer app
* Refactor app to use threads
* Clean up code, add comments
* Add CRC checking
* Increase update period
* Fix error in fbt
* Revert the old update period
* Use settable pin in onewire_host
* Use settable pin for onewire_slave
* Clear EXTI flag after callback, make private methods static in onewire_slave
* Do not hardcode GPIO pin number
* Remove iButton hal from furi_hal_rfid
* Remove most of furi_hal_ibutton
* Add some of furi_hal_ibutton back
* Slightly neater code
* Fix formatting
* Fix PVS-studio warnings
* Update CODEOWNERS
* Add furi_hal_gpio_get_ext_pin_number
* Create README.md
* FuriHal: move furi_hal_gpio_get_ext_pin_number to resources

---------

Co-authored-by: Aleksandr Kutuzov <[email protected]>

Author: gsurkov

.github/CODEOWNERS

@@ -42,6 +42,8 @@
 
 /applications/debug/unit_tests/ @skotopes @DrZlo13 @hedger @nminaylov @gornekich @Astrrra @gsurkov @Skorpionm
 
+/applications/examples/example_thermo/ @skotopes @DrZlo13 @hedger @gsurkov
+
 # Assets
 /assets/resources/infrared/ @skotopes @DrZlo13 @hedger @gsurkov
 

applications/examples/example_thermo/README.md

@@ -0,0 +1,44 @@
+# 1-Wire Thermometer
+This example application demonstrates the use of the 1-Wire library with a DS18B20 thermometer. 
+It also covers basic GUI, input handling, threads and localisation.
+
+## Electrical connections
+Before launching the application, connect the sensor to Flipper's external GPIO according to the table below:
+| DS18B20 | Flipper |
+| :-----: | :-----: |
+| VDD | 9 |
+| GND | 18 |
+| DQ  | 17 |
+
+*NOTE 1*: GND is also available on pins 8 and 11.
+
+*NOTE 2*: For any other pin than 17, connect an external 4.7k pull-up resistor to pin 9.
+
+## Launching the application
+In order to launch this demo, follow the steps below:
+1. Make sure your Flipper has an SD card installed.
+2. Connect your Flipper to the computer via a USB cable.
+3. Run `./fbt launch_app APPSRC=example_thermo` in your terminal emulator of choice.
+
+## Changing the data pin
+It is possible to use other GPIO pin as a 1-Wire data pin. In order to change it, set the `THERMO_GPIO_PIN` macro to any of the options listed below:
+
+```c
+/* Possible GPIO pin choices:
+ - gpio_ext_pc0
+ - gpio_ext_pc1
+ - gpio_ext_pc3
+ - gpio_ext_pb2
+ - gpio_ext_pb3
+ - gpio_ext_pa4
+ - gpio_ext_pa6
+ - gpio_ext_pa7
+ - ibutton_gpio
+*/
+
+#define THERMO_GPIO_PIN (ibutton_gpio)
+```
+Do not forget about the external pull-up resistor as these pins do not have one built-in.
+
+With the changes been made, recompile and launch the application again. 
+The on-screen text should reflect it by asking to connect the thermometer to another pin.

applications/examples/example_thermo/application.fam

@@ -0,0 +1,10 @@
+App(
+    appid="example_thermo",
+    name="Example: Thermometer",
+    apptype=FlipperAppType.EXTERNAL,
+    entry_point="example_thermo_main",
+    requires=["gui"],
+    stack_size=1 * 1024,
+    fap_icon="example_thermo_10px.png",
+    fap_category="Examples",
+)