ft6336: add support for ft6336

ft6336/ft6336.go

@@ -0,0 +1,107 @@
+// Package ft6336 provides a driver for the FT6336 I2C Self-Capacitive touch
+// panel controller.
+//
+// Datasheet: https://focuslcds.com/content/FT6236.pdf
+//
+package ft6336
+
+import (
+	"machine"
+
+	"tinygo.org/x/drivers"
+	"tinygo.org/x/drivers/touch"
+)
+
+// Device wraps FT6336 I2C Self-Capacitive touch
+type Device struct {
+	bus     drivers.I2C
+	buf     []byte
+	Address uint8
+	intPin  machine.Pin
+}
+
+// New returns FT6336 device for the provided I2C bus using default address.
+func New(i2c drivers.I2C, intPin machine.Pin) *Device {
+	return &Device{
+		bus:     i2c,
+		buf:     make([]byte, 11),
+		Address: Address,
+		intPin:  intPin,
+	}
+}
+
+// Config contains settings for FT6636.
+type Config struct {
+}
+
+// Configure the FT6336 device.
+func (d *Device) Configure(config Config) error {
+	d.write1Byte(0xA4, 0x00)
+	d.intPin.Configure(machine.PinConfig{Mode: machine.PinInputPulldown})
+	return nil
+}
+
+// SetGMode sets interrupt mode.
+//  0x00 : Interrupt Polling mode
+//  0x01 : Interrupt Trigger mode (default)
+func (d *Device) SetGMode(v uint8) {
+	d.write1Byte(RegGMode, v)
+}
+
+// GetGMode gets interrupt mode.
+func (d *Device) GetGMode() uint8 {
+	return d.read8bit(RegGMode)
+}
+
+// SetPeriodActive sets report rate in Active mode.
+func (d *Device) SetPeriodActive(v uint8) {
+	d.write1Byte(RegPeriodActive, v)
+}
+
+// GetPeriodActive gets report rate in Active mode.
+func (d *Device) GetPeriodActive() uint8 {
+	return d.read8bit(RegPeriodActive)
+}
+
+// GetFirmwareID gets firmware version.
+func (d *Device) GetFirmwareID() uint8 {
+	return d.read8bit(RegFirmid)
+}
+
+// Read reads the registers.
+func (d *Device) Read() []byte {
+	d.bus.Tx(uint16(d.Address), []byte{0x02}, d.buf[:])
+	return d.buf[:]
+}
+
+// ReadTouchPoint reads a single touch.Point from the device. The maximum value
+// for each touch.Point is 0xFFFF.
+func (d *Device) ReadTouchPoint() touch.Point {
+	d.Read()
+	z := 0xFFFFF
+	if d.buf[0] == 0 {
+		z = 0
+	}
+
+	//Scale X&Y to 16 bit for consistency across touch drivers
+	return touch.Point{
+		X: (int(d.buf[1]&0x0F)<<8 + int(d.buf[2])) * ((1 << 16) / 320),
+		Y: (int(d.buf[3]&0x0F)<<8 + int(d.buf[4])) * ((1 << 16) / 270),
+		Z: z,
+	}
+}
+
+// Touched returns if touched or not.
+func (d *Device) Touched() bool {
+	p := d.ReadTouchPoint()
+	return p.Z > 0
+}
+
+func (d *Device) write1Byte(reg, data uint8) {
+	d.bus.WriteRegister(d.Address, reg, []byte{data})
+}
+
+func (d *Device) read8bit(reg uint8) uint8 {
+	d.bus.ReadRegister(d.Address, reg, d.buf[:1])
+	return d.buf[0]
+}