Difference between revisions of "Unit RPIFT5406"
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=== Description === | === Description === | ||
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| + | '''Raspberry Pi FT5406 Touch Driver unit''' | ||
This is the touchscreen driver for the Official Raspberry Pi 7" Touchscreen. While this device uses a FocalTech FT5406 10 point capactive touchscreen controller it is actually connected to the GPU and not directly accessible to the ARM processor. | This is the touchscreen driver for the Official Raspberry Pi 7" Touchscreen. While this device uses a FocalTech FT5406 10 point capactive touchscreen controller it is actually connected to the GPU and not directly accessible to the ARM processor. | ||
Revision as of 05:51, 19 December 2016
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Description
Raspberry Pi FT5406 Touch Driver unit
This is the touchscreen driver for the Official Raspberry Pi 7" Touchscreen. While this device uses a FocalTech FT5406 10 point capactive touchscreen controller it is actually connected to the GPU and not directly accessible to the ARM processor.
In order to make the touchscreen data available the GPU provides a memory based interface that can be read by polling an address returned from a mailbox call.
The Linux driver uses a thread to poll the data approximately 60 times per second so this driver does something similar.
Constants
RPiFT5406 specific constants
RPIFT5406_* RPIFT5406_TOUCH_DESCRIPTION = 'Raspberry Pi FT5406 Touch Controller';
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Description of RPiFT5406 Touch device |
RPIFT5406_THREAD_NAME = 'RPiFT5406 Touch';
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Name of the RPiFT5406 Touch polling thread |
RPIFT5406_MAX_POINTS = 10;
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RPIFT5406_MAX_X = $FFF;
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RPIFT5406_MAX_Y = $FFF;
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RPIFT5406_MAX_Z = 0;
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RPIFT5406_SCREEN_WIDTH = 800;
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RPIFT5406_SCREEN_HEIGHT = 480;
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Type definitions
To be documented
Public variables
To be documented
Function declarations
Initialization functions
procedure RPiFT5406Init;
Description: Initialize the RPiFT5406 unit and create, register and start the device
| Note | Called only during system startup |
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RPiFT5406 touch functions
function RPiFT5406TouchStart(Touch:PTouchDevice):LongWord;
Description: Implementation of TouchDeviceStart API for RPiFT5406
| Note | Not intended to be called directly by applications, use TouchDeviceStart instead |
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function RPiFT5406TouchStop(Touch:PTouchDevice):LongWord;
Description: Implementation of TouchDeviceStop API for RPiFT5406
| Note | Not intended to be called directly by applications, use TouchDeviceStop instead |
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function RPiFT5406TouchExecute(Touch:PRPiFT5406Touch):PtrInt;
Description: Thread function for the RPiFT5406 Touch controller driver. The thread polls the memory touch buffer approximately 60 times per second for new touch data and inserts received touch points into the buffer of the passed device
| Note | Not intended to be called directly by applications |
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