Add basic touch panel driver.

Handle touch event in display app : draw a big square at the touch point coordinates.
2020-01-03 16:32:31 +01:00
parent 27d0e1e02f
commit ee530baaa0
8 changed files with 179 additions and 103 deletions
--- a/src/drivers/Cst816s.h
+++ b/src/drivers/Cst816s.h
@@ -0,0 +1,47 @@
+#pragma once
+
+#include <nrfx_twi.h>
+
+namespace Pinetime {
+  namespace Drivers {
+    class Cst816S {
+      public :
+        struct TouchInfos {
+          uint16_t x;
+          uint16_t y;
+          uint8_t action;
+          uint8_t finger;
+          uint8_t pressure;
+          uint8_t area;
+          bool isTouch = false;
+        };
+
+        void Init();
+        void Probe();
+        TouchInfos GetTouchInfo();
+      private:
+        static constexpr uint8_t pinIrq = 28;
+        static constexpr uint8_t pinReset = 10;
+        static constexpr uint8_t address = 0x15;
+        static constexpr uint8_t lastTouchId = 0x0f;
+        static constexpr uint8_t touchPointNumIndex = 2;
+        static constexpr uint8_t touchMiscIndex = 8;
+        static constexpr uint8_t touchXYIndex = 7;
+        static constexpr uint8_t touchEventIndex = 3;
+        static constexpr uint8_t touchXHighIndex = 3;
+        static constexpr uint8_t touchXLowIndex = 4;
+        static constexpr uint8_t touchYHighIndex = 5;
+        static constexpr uint8_t touchYLowIndex = 6;
+        static constexpr uint8_t touchIdIndex = 5;
+        static constexpr uint8_t touchStep = 6;
+
+        uint8_t touchData[63];
+
+        // TODO TWI (i²C) should be created outside and injected into this class
+        // It will be needed when implementing other I²C devices
+        // (0x15 = touch, 0x18 = accelerometer, 0x44 = HR sensor)
+        nrfx_twi_t twi = NRFX_TWI_INSTANCE(1); // Use instance 1, because instance 0 is already used by SPI
+    };
+
+  }
+}