[board] Provide both touch sensor addresses for F469-DISCO

To detect the touch sensor address at runtime.

examples/stm32f469_discovery/game_of_life/main.cpp

@@ -39,6 +39,7 @@ void read_touch()
 	static Touch touchSensor(touchData, TouchAddress);
 	static bool initialized = false;
 	if (not initialized) {
+		if (not touchSensor.ping()) touchSensor.setAddress(TouchAddress2);
 		// Configure the touchscreen to sample with 60Hz in active and monitor mode.
 		touchSensor.configure(Touch::InterruptMode::Polling, 60, 60);
 		initialized = true;

examples/stm32f469_discovery/touchscreen/main.cpp

@@ -27,6 +27,7 @@ class LineDrawer : public modm::Fiber<>
 	void
 	update()
 	{
+		if (not touch.ping()) touch.setAddress(TouchAddress2);
 
 		// Configure the touchscreen to sample with 60Hz in active and monitor mode.
 		touch.configure(Touch::InterruptMode::Trigger, 60, 60);

src/modm/board/disco_f469ni/board.hpp.in

@@ -170,6 +170,7 @@ using Sda = GpioB9;
 using I2cMaster = I2cMaster1;
 using Touch = modm::Ft6x06< I2cMaster >;
 constexpr uint8_t TouchAddress = {{touch_address}};
+constexpr uint8_t TouchAddress2 = {{touch_address2}};
 /// @}
 }
 

src/modm/board/disco_f469ni/module.lb

@@ -38,10 +38,14 @@ def prepare(module, options):
 
 def build(env):
     env.outbasepath = "modm/src/modm/board"
+    a1, a2 = [0x2a, 0x38]
+    if env[":disco-f469ni"] == "b-03":
+        a1, a2 = a2, a1
     env.substitutions = {
         "with_logger": True,
         "with_assert": env.has_module(":architecture:assert"),
-        "touch_address": 0x38 if env[":disco-f469ni"] == "b-03" else 0x2a,
+        "touch_address": a1,
+        "touch_address2": a2,
     }
     env.template("../board.cpp.in", "board.cpp")
     env.copy("board_display.cpp")

src/modm/board/disco_f469ni/module.md

@@ -30,13 +30,17 @@ Call `Board::initializeTouchscreen()` to setup the peripherals.
 
 ## Hardware Revisions
 
-The revision B-03 has a different touch sensor address from B-01 and B-02, which is
-provided as `Board::ft6::TouchAddress`:
+The revision B-03 has a different touch sensor address from B-01 and B-02.
+The correct address for the revision is provided as `Board::ft6::TouchAddress`:
 
 ```cpp
 Board::ft6::Touch::Data data;
 Board::ft6::Touch touchSensor(data, Board::ft6::TouchAddress);
 ```
 
-If you have an earlier revision, you can extend your configuration from
-`modm:disco-f469ni:b-01`.
+If you want to provide the same code for both revisions, you can change the
+address at runtime if the device does not respond to a ping:
+
+```cpp
+if (not touchSensor.ping()) touchSensor.setAddress(Board::ft6::TouchAddress2);
+```