Snapshot: full project state

include/touch_ft6336.h

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+#ifndef TOUCH_FT6336_H
+#define TOUCH_FT6336_H
+
+#include <Wire.h>
+#include "board_config.h"
+
+// FT6336 Capacitive Touch Controller
+class TouchFT6336 {
+public:
+    struct TouchPoint {
+        uint16_t x;
+        uint16_t y;
+        uint8_t pressure;
+        bool pressed;
+    };
+
+    // Initialize I2C touch controller
+    static bool begin() {
+        // Hardware reset (active low)
+        pinMode(TOUCH_RST, OUTPUT);
+        digitalWrite(TOUCH_RST, LOW);
+        delay(10);
+        digitalWrite(TOUCH_RST, HIGH);
+        delay(300);
+
+        pinMode(TOUCH_INT, INPUT_PULLUP);
+
+        Wire.begin(TOUCH_SDA, TOUCH_SCL, 400000);
+        delay(100);
+
+        // Verify FT6336 is present (chip ID reg 0xA3 = 0x64 on FT6336G)
+        uint8_t chipID = readReg(0xA3);
+        Serial.printf("[Touch] Chip ID: 0x%02X\n", chipID);
+        if (chipID == 0x00 || chipID == 0xFF) {
+            return false; // Not responding
+        }
+
+        // Reset to defaults
+        writeReg(0xFC, 0x01);
+        delay(300);
+
+        // Set to normal mode, threshold
+        writeReg(0x80, 0x00); // Normal mode
+        writeReg(0x88, 40);   // Touch threshold
+
+        return true;
+    }
+
+    // Read touch point (single finger)
+    static TouchPoint readTouch() {
+        TouchPoint tp = {0, 0, 0, false};
+
+        Wire.beginTransmission(TOUCH_ADDR);
+        Wire.write(0x02);
+        if (Wire.endTransmission() != 0) return tp;
+
+        // Read 5 bytes: status + X/Y coordinates
+        if (Wire.requestFrom((uint8_t)TOUCH_ADDR, (uint8_t)5) != 5) {
+            return tp;
+        }
+
+        uint8_t status = Wire.read();
+        uint8_t x_hi = Wire.read();
+        uint8_t x_lo = Wire.read();
+        uint8_t y_hi = Wire.read();
+        uint8_t y_lo = Wire.read();
+
+        // Extract touch count (bits 3-0)
+        uint8_t touch_count = status & 0x0F;
+
+        if (touch_count > 0) {
+            tp.pressed = true;
+            tp.x = ((x_hi & 0x0F) << 8) | x_lo;
+            tp.y = ((y_hi & 0x0F) << 8) | y_lo;
+            tp.pressure = 255; // Capacitive doesn't have pressure, default max
+        }
+
+        return tp;
+    }
+
+    // Calibrate touch (4-point corners)
+    static void calibrate() {
+        // FT6336 typically doesn't need manual calibration
+        // It auto-calibrates on startup
+        // If needed, implement 4-point calibration here
+    }
+
+    // Get firmware version
+    static uint8_t getFirmwareVersion() {
+        return readReg(0xA6);
+    }
+
+    // Power modes
+    static void setPowerMode(uint8_t mode) {
+        // 0 = Active, 1 = Monitor, 3 = Sleep
+        writeReg(0xA5, mode);
+    }
+
+    static void sleep() {
+        setPowerMode(3);
+    }
+
+    static void wakeup() {
+        setPowerMode(0);
+        delay(50);
+    }
+
+private:
+    static uint8_t readReg(uint8_t reg) {
+        Wire.beginTransmission(TOUCH_ADDR);
+        Wire.write(reg);
+        Wire.endTransmission();
+
+        Wire.requestFrom((uint8_t)TOUCH_ADDR, (uint8_t)1);
+        return Wire.read();
+    }
+
+    static void writeReg(uint8_t reg, uint8_t value) {
+        Wire.beginTransmission(TOUCH_ADDR);
+        Wire.write(reg);
+        Wire.write(value);
+        Wire.endTransmission();
+    }
+};
+
+#endif // TOUCH_FT6336_H