Difference between revisions of "Unit RPIFT5406"
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Revision as of 05:09, 24 April 2018
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Contents
[hide]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 capacitive 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
[Expand]
RPiFT5406 specific constants
RPIFT5406_*
Type definitions
RPiFT5406 touch point
RPiFT5406 registers
RPiFT5406 touch
Public variables
None defined
Function declarations
Initialization functions
[Expand]
procedure RPiFT5406Init;
Description: Initialize the RPiFT5406 unit and create, register and start the device
RPiFT5406 touch functions
[Expand]
function RPiFT5406TouchStart(Touch:PTouchDevice):LongWord;
Description: Implementation of TouchDeviceStart API for RPiFT5406
[Expand]
function RPiFT5406TouchStop(Touch:PTouchDevice):LongWord;
Description: Implementation of TouchDeviceStop API for RPiFT5406
[Expand]
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
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