abstracting display, touch and sd

lib/ft6336u/ft6336u.h

@@ -0,0 +1,131 @@
+/*
+ * FT6336U Capacitive Touch Screen Driver
+ * I2C Interface
+ * 
+ * Based on FT6336U datasheet for 4.0" TFT Module
+ */
+
+#ifndef FT6336U_H
+#define FT6336U_H
+
+#include "pico/stdlib.h"
+#include "hardware/i2c.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+// FT6336U I2C Address
+#define FT6336U_ADDR 0x38
+
+// FT6336U Registers
+#define FT6336U_REG_DEVICE_MODE     0x00
+#define FT6336U_REG_GESTURE_ID      0x01
+#define FT6336U_REG_TD_STATUS       0x02  // Number of touch points
+
+#define FT6336U_REG_P1_XH           0x03
+#define FT6336U_REG_P1_XL           0x04
+#define FT6336U_REG_P1_YH           0x05
+#define FT6336U_REG_P1_YL           0x06
+#define FT6336U_REG_P1_WEIGHT       0x07
+#define FT6336U_REG_P1_MISC         0x08
+
+#define FT6336U_REG_P2_XH           0x09
+#define FT6336U_REG_P2_XL           0x0A
+#define FT6336U_REG_P2_YH           0x0B
+#define FT6336U_REG_P2_YL           0x0C
+#define FT6336U_REG_P2_WEIGHT       0x0D
+#define FT6336U_REG_P2_MISC         0x0E
+
+#define FT6336U_REG_CHIPID          0xA3  // Chip ID (should read 0x64)
+#define FT6336U_REG_FIRMID          0xA6
+#define FT6336U_REG_VENDID          0xA8
+
+// Touch event types
+#define FT6336U_EVENT_PRESS_DOWN    0x00
+#define FT6336U_EVENT_LIFT_UP       0x01
+#define FT6336U_EVENT_CONTACT       0x02
+#define FT6336U_EVENT_NO_EVENT      0x03
+
+// Maximum touch points supported
+#define FT6336U_MAX_TOUCH_POINTS    2
+
+// Touch point structure
+typedef struct {
+    uint16_t x;
+    uint16_t y;
+    uint8_t event;    // Press down, lift up, contact, no event
+    uint8_t id;       // Touch point ID
+    uint8_t weight;   // Touch pressure/area
+} ft6336u_touch_point_t;
+
+// Touch data structure
+typedef struct {
+    uint8_t touch_count;
+    ft6336u_touch_point_t points[FT6336U_MAX_TOUCH_POINTS];
+    uint8_t gesture;
+} ft6336u_touch_data_t;
+
+// Configuration structure
+typedef struct {
+    i2c_inst_t *i2c;
+    uint gpio_sda;
+    uint gpio_scl;
+    uint gpio_rst;
+    uint gpio_int;
+    uint16_t screen_width;
+    uint16_t screen_height;
+    bool swap_xy;          // Swap X and Y coordinates
+    bool invert_x;         // Invert X coordinate
+    bool invert_y;         // Invert Y coordinate
+} ft6336u_config_t;
+
+/**
+ * Initialize the FT6336U touch controller
+ * @param config Configuration structure
+ * @return true if successful, false otherwise
+ */
+bool ft6336u_init(const ft6336u_config_t *config);
+
+/**
+ * Read touch data from the controller
+ * @param data Pointer to touch data structure to fill
+ * @return true if successful, false otherwise
+ */
+bool ft6336u_read_touch(ft6336u_touch_data_t *data);
+
+/**
+ * Check if screen is currently being touched
+ * @return true if touched, false otherwise
+ */
+bool ft6336u_is_touched(void);
+
+/**
+ * Get the chip ID (should be 0x64 for FT6336U)
+ * @return Chip ID or 0xFF on error
+ */
+uint8_t ft6336u_get_chip_id(void);
+
+/**
+ * Get the firmware version
+ * @return Firmware version or 0xFF on error
+ */
+uint8_t ft6336u_get_firmware_version(void);
+
+/**
+ * Set up interrupt on INT pin
+ * @param callback Function to call on touch interrupt
+ */
+void ft6336u_set_interrupt_callback(void (*callback)(uint gpio, uint32_t events));
+
+/**
+ * Test I2C bus communication
+ * @return true if I2C is responding correctly
+ */
+bool ft6336u_test_i2c(void);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // FT6336U_H