Crate ft6336u_driver 

FT6336U Capacitive Touch Controller Driver

A platform-agnostic driver for the FT6336U capacitive touch controller using the embedded-hal I2C traits.

Features

• No std dependency - works in embedded environments
• Uses embedded-hal I2C traits for portability
• Support for up to 2 simultaneous touch points
• Gesture detection capabilities
• Configurable power modes and scan rates
• Comprehensive register access

Quick Start

use ft6336u_driver::FT6336U;

// Create the driver with your I2C peripheral
let mut touch = FT6336U::new(i2c);

// Scan for touch events
let touch_data = touch.scan().unwrap();

if touch_data.touch_count > 0 {
    let point = &touch_data.points[0];
    println!("Touch at ({}, {})", point.x, point.y);
}

Hardware Integration

The FT6336U communicates over I2C at address 0x38. It requires:

• An I2C bus connection (SDA/SCL)
• A reset pin (typically controlled by GPIO or GPIO expander)
• An interrupt pin (optional, for event-driven operation)

Interrupt-Driven Operation

For optimal power efficiency, configure the touch controller’s interrupt pin and use it to trigger touch scans only when needed:

use ft6336u_driver::{FT6336U, GestureMode};

let mut touch = FT6336U::new(i2c);

// Enable interrupt mode
touch.write_g_mode(GestureMode::Trigger).unwrap();

// In your interrupt handler:
// let data = touch.scan().unwrap();

Structs

FT6336U

FT6336U capacitive touch controller driver with async I2C interface

TouchData

Complete touch data including up to 2 touch points

TouchPoint

A single touch point with coordinates and status

Enums

CtrlMode

Control mode for power management

DeviceMode

Device operating mode

Error

Errors that can occur during FT6336U operations

GestureMode

Gesture mode (interrupt trigger configuration)

TouchStatus

Touch event status for a single touch point

Constants

ADDR_ACTIVE_MODE_RATE

Active mode report rate register address

ADDR_CHIP_ID

Chip ID register address

ADDR_CTRL

Control mode register address

ADDR_DEVICE_MODE

Device mode register address

ADDR_DISTANCE_LEFT_RIGHT

Gesture distance left/right register address

ADDR_DISTANCE_UP_DOWN

Gesture distance up/down register address

ADDR_DISTANCE_ZOOM

Gesture distance zoom register address

ADDR_FILTER_COE

Filter coefficient register address

ADDR_FIRMWARE_ID

Firmware ID register address

ADDR_FOCALTECH_ID

Focaltech ID register address

ADDR_GESTURE_ID

Gesture ID register address

ADDR_G_MODE

Gesture mode register address

ADDR_LIBRARY_VERSION_H

Library version high byte register address

ADDR_LIBRARY_VERSION_L

Library version low byte register address

ADDR_MONITOR_MODE_RATE

Monitor mode report rate register address

ADDR_OFFSET_LEFT_RIGHT

Gesture offset left/right register address

ADDR_OFFSET_UP_DOWN

Gesture offset up/down register address

ADDR_POWER_MODE

Power mode register address

ADDR_RADIAN_VALUE

Gesture radian value register address

ADDR_RELEASE_CODE_ID

Release code ID register address

ADDR_STATE

Device state register address

ADDR_TD_STATUS

Touch detection status register address

ADDR_THRESHOLD

Touch detection threshold register address

ADDR_TIME_ENTER_MONITOR

Time to enter monitor mode register address

ADDR_TOUCH1_EVENT

Touch point 1 event register address

ADDR_TOUCH1_ID

Touch point 1 ID register address

ADDR_TOUCH1_MISC

Touch point 1 miscellaneous data register address

ADDR_TOUCH1_WEIGHT

Touch point 1 weight register address

ADDR_TOUCH1_X

Touch point 1 X coordinate register address

ADDR_TOUCH1_Y

Touch point 1 Y coordinate register address

ADDR_TOUCH2_EVENT

Touch point 2 event register address

ADDR_TOUCH2_ID

Touch point 2 ID register address

ADDR_TOUCH2_MISC

Touch point 2 miscellaneous data register address

ADDR_TOUCH2_WEIGHT

Touch point 2 weight register address

ADDR_TOUCH2_X

Touch point 2 X coordinate register address

ADDR_TOUCH2_Y

Touch point 2 Y coordinate register address

COORD_UD

Coordinate up/down flag

I2C_ADDR

FT6336U I2C address

PRES_DOWN

Touch press down flag