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Description
Goodix I2C Touchscreen Driver unit
The GOODIX I2C controllers are a range of capacitive touchscreen controllers that include multipoint touch support and are used by a variety of small LCD displays. The exact features and capability of each device can be found by checking the datasheets which can be obtained online.
This driver is compatible with the following devices:
goodix,gt1151
goodix,gt5663
goodix,gt5688
goodix,gt911
goodix,gt9110
goodix,gt912
goodix,gt9147
goodix,gt917s
goodix,gt927
goodix,gt9271
goodix,gt928
goodix,gt9286
goodix,gt967
Constants
[Expand]
Goodix specific constants GOODIX_*
GOODIX_TOUCH_DESCRIPTION = 'Goodix Touch Controller';
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Description of Goodix Touch device
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GOODIX_MAX_HEIGHT = 4096;
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GOODIX_MAX_WIDTH = 4096;
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GOODIX_INT_TRIGGER = 1;
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GOODIX_CONTACT_SIZE = 8;
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GOODIX_MAX_CONTACT_SIZE = 9;
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GOODIX_MAX_CONTACTS = 10;
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GOODIX_MAX_KEYS = 7;
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GOODIX_CONFIG_MIN_LENGTH = 186;
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GOODIX_CONFIG_911_LENGTH = 186;
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GOODIX_CONFIG_967_LENGTH = 228;
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GOODIX_CONFIG_GT9X_LENGTH = 240;
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GOODIX_CONFIG_MAX_LENGTH = 240;
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[Expand]
Goodix I2C clock rate GOODIX_I2C_*
GOODIX_I2C_RATE = 400000;
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Default I2C clock rate
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GOODIX_CONFIG_TIMEOUT = 3000;
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Timeout to wait for firmware ready
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[Expand]
Goodix register commands GOODIX_REG_*
GOODIX_REG_COMMAND = $8040;
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GOODIX_CMD_SCREEN_OFF = $05;
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GOODIX_READ_COOR_ADDR = $814E;
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GOODIX_GT1X_REG_CONFIG_DATA = $8050;
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GOODIX_GT9X_REG_CONFIG_DATA = $8047;
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GOODIX_REG_ID = $8140;
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GOODIX_BUFFER_STATUS_READY = (1 shl 7);
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GOODIX_HAVE_KEY = (1 shl 4);
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GOODIX_BUFFER_STATUS_TIMEOUT = 20;
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GOODIX_ID_MAX_LEN = 4;
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GOODIX_RESOLUTION_OFFSET = 1;
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GOODIX_MAX_CONTACTS_OFFSET = 5;
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GOODIX_TRIGGER_OFFSET = 6;
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GOODIX_IRQ_TRIGGERS:array[0..3] of LongWord = (GPIO_TRIGGER_RISING,GPIO_TRIGGER_FALLING,GPIO_TRIGGER_LOW,GPIO_TRIGGER_HIGH);
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Type definitions
Goodix touch
[Expand]
PGOODIXTouch = ^TGOODIXTouch;
TGOODIXTouch = record
| Touch Properties
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Touch:TTouchDevice;
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| I2C Properties
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I2C:PI2CDevice;
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The I2C device this device is connected to
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Address:Word;
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The I2C address of the device
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| General Properties
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IRQ:TGPIOInfo;
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The GPIO information for the IRQ line (Optional)
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RST:TGPIOInfo;
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The GPIO information for the Reset line (Optional)
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MaxX:Word;
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Maximum X value from current configuration
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MaxY:Word;
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Maximum Y value from current configuration
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Width:Word;
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Screen width value supplied during create
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Height:Word;
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Screen height value supplied during create
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MaxPoints:LongWord;
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Maximum touch points from current configuration
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LastKeys:LongWord;
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Keys reported in last input report
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LastPoints:LongWord;
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Points reported in last input report
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| Goodix Properties
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Id:String;
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ID String for this device
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Version:Word;
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Version number for this device
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ConfigAddress:Word;
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Configuration data address
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ConfigLength:LongWord;
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Configuration data length in bytes
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ChecksumSize:LongWord;
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Configuration checksum size
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ContactSize:LongWord;
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Size of each contact point coordinate in touch data
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Configuration:array[0..GOODIX_CONFIG_MAX_LENGTH - 1] of Byte;
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KeyCodes:array[0..GOODIX_MAX_KEYS - 1] of Word;
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ScanCodes:array[0..GOODIX_MAX_KEYS - 1] of Word;
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SwapConfigXY:Boolean;
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If True swap the max X and Y values in the configuration
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SwapReportXY:Boolean;
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If True swap the X and Y values in the input report
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InvertReportX:Boolean;
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If True invert the X value in the input report
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InvertReportY:Boolean;
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If True invert the Y value in the input report
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ConfigFilename:String;
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The configuration filename to load during initialization
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ResetController:Boolean;
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If True reset the controller during initialization
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GOODIX point data
TGOODIXPointData = array[0..(2 + GOODIX_MAX_CONTACT_SIZE * GOODIX_MAX_CONTACTS) - 1] of Byte;
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Public variables
Goodix specific variables
GOODIX_SWAP_CONFIG_XY:Boolean;
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GOODIX_SWAP_REPORT_XY:Boolean;
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GOODIX_INVERT_REPORT_X:Boolean;
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GOODIX_INVERT_REPORT_Y:Boolean;
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GOODIX_LOAD_CONFIG_FILE:String;
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GOODIX_RESET_CONTROLLER:Boolean;
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Function declarations
Initialization functions
[Expand]
procedure GOODIXInit;
Description: Initialize the Goodix Touch unit and parameters
| Note
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Called internally by other functions
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Goodix functions
[Expand]
function GOODIXTouchCreate(I2C:PI2CDevice; Address:Word; Width,Height:LongWord; IRQ,RST:PGPIOInfo):PTouchDevice;
Description: Create, register and start a new Goodix Touch device connected to the specified I2C device
| I2C
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The I2C device this Goodix Touch device is connected to
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| Address
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The I2C address for this Goodix Touch device
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| Width
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The width of the screen in pixels (When set at TOUCH_ROTATION_0)
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| Height
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The height of the screen in pixels (When set at TOUCH_ROTATION_0)
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| IRQ
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The GPIO information for the IRQ line (Optional)
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| Return
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Pointer to the new Touch device or nil on failure
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[Expand]
function GOODIXTouchDestroy(Touch:PTouchDevice):LongWord;
Description: Stop, deregister and destroy a Goodix Touch device created by this driver
| Touch
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The Touch device to destroy
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| Return
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ERROR_SUCCESS if completed or another error code on failure
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Goodix touch functions
[Expand]
function GOODIXTouchStart(Touch:PTouchDevice):LongWord;
Description: Implementation of TouchDeviceStart API for Goodix Touch device
| Note
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Not intended to be called directly by applications, use TouchDeviceStart instead.
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[Expand]
function GOODIXTouchStop(Touch:PTouchDevice):LongWord;
Description: Implementation of TouchDeviceStop API for Goodix Touch device
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Not intended to be called directly by applications, use TouchDeviceStop instead.
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[Expand]
function GOODIXTouchUpdate(Touch:PTouchDevice):LongWord;
Description: Implementation of TouchDeviceUpdate API for Goodix Touch device
| Note
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Not intended to be called directly by applications, use TouchDeviceUpdate instead.
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[Expand]
procedure GOODIXTouchCallback(Touch:PGOODIXTouch; Pin,Trigger:LongWord);
Description: Touch device event callback (Interrupt) handler for Goodix Touch device
| Note
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Not intended to be called directly by applications
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