Bridgetek FT801 - CMD_CSKETCH - Capacitive touch specific sketch

FT800 Series Programmer Guide
Version 2.1
Document Reference No.: BRT_000030 Clearance No.: BRT#037
254
Product Page
Document Feedback Copyright © Bridgetek Limited
6.6 CMD_CSKETCH – Capacitive touch specific sketch
This command has the same functionality as CMD_SKETCH except it has done the
optimization for a capacitive touch panel. Because capacitive touch panels have lower
sampling frequencies (around 100Hz) to report the coordinates, the sketch functionality
updates less frequently compared to resistive touch. CMD_CSKETCH introduces a linear
interpolation algorithm to provide a smoother effect when drawing the output line.
Please note this command is not applicable to FT800 silicon.
C prototype
void cmd_csketch( int16_t x,
int16_t y,
uint16_t w,
uint16_t h,
uint32_t ptr,
uint16_t format,
uint16_t freq);
Command layout
+0
CMD_CSKETCH(0xffffff35)
+4
X
+6
Y
+8
W
+10
H
+12
Ptr
+16
Format
+18
Freq
Parameters
x
x-coordinate of sketch area top-left, in pixels
y
y-coordinate of sketch area top-left, in pixels
w