Allwinner A20 - TP Register List

A20 User Manual (Revision 1.2) Copyright © 2013 Allwinner Technology Co., Ltd. All Rights Reserved. Page 206 / 812
a window size of 16. This means that 16 measurements are taken and arranged in descending order
in a temporary array. The averaging window size in this example is 8. The output is the average of
the middle eight values of the 16 measurements taken with the median filter.
12-BIT
SAR ADC
MEDIAN
FILTER
AVERAGING
FILTER
2
3
5
1
6
7
8
9
10
12
11
15
13
4
14
16
1
2
3
4
5
6
8
7
9
10
11
12
13
14
16
15
1
2
3
4
5
6
8
7
9
10
11
12
13
14
16
15
M=16 A=8
Converted Results
16 Measurements
Arranged
Average Of Middle
8 Values
FIFO
Median and Averaging Filter Example
1.15.6. TP Register List
Module Name
Base Address
TP
0x01C25000
Register Name
Offset
Description
TP_CTRL0
0x00
TP Control Register0
TP_CTRL1
0x04
TP Control Register1
TP_CTRL2
0x08
TP Pressure Measurement and touch sensitive
Control Register
TP_CTRL3
0x0c
Median and averaging filter Controller Register
TP_INT_FIFOC
0x10
TP Interrupt FIFO Control Register
TP_INT_FIFOS
0x14
TP Interrupt FIFO Status Register
TP_TPR
0x18
TP Temperature Period Register