Allwinner A20 - Page 210

A20 User Manual (Revision 1.2) Copyright © 2013 Allwinner Technology Co., Ltd. All Rights Reserved. Page 210 / 812
Offset: 0x08
Register Name: TP_CNT2
Bit
Read/
Write
Default/H
ex
Description
Notes: Used to adjust sensitivity of pen down detection
27:26
R/W
0x0
TP_FIFO_MODE_SELECT.
TP FIFO Access Data Mode Select
00: FIFO store X1,Y1 data for single touch no pressure mode
01: FIFO store X1,Y1,
△
X,
△
Y data for dual touch no pressure
mode
10: FIFO store X1,Y1, X2,Y2 data for dual touch no pressure
mode
11: FIFO store X1,Y1, X2,Y2,Z1,Z2 data for dual touch and
pressure mode
Notes: The ADC output data in single touch mode can store in
FIFO with TP_FIFO_MODE_SELECT configured as 01,10,11.
But the data
△
X,
△
Y is theoretically equal to zero and X2,Y2 is
equal to X1,Y1.
25
/
/
/
24
R/W
0x0
PRE_MEA_EN.
TP Pressure Measurement Enable Control
0: Disable
1: Enable
23:0
R/W
0xFFF
PRE_MEA_THRE_CNT.
TP Pressure Measurement threshold Control
Notes:
0x000000: least sensitive
0xFFFFFF: most sensitive
Notes: used to adjust sensitivity of touch
1.15.7.4. MEDIAN AND AVERAGING FILTER CONTROL REGISTER
Offset: 0x0c
Register Name: TP_CTRL3
Bit
Read/
Write
Default/
Hex
Description
31:3
/
/
/
2
R/W
0x0
FILTER_EN.
Filter Enable
0: Disable
1: Enable