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The source files needed for compiling your application along with the touch library are
touch_api.h, touch_config.h and qt_asm_tiny_mega.S.
5.6.10.2.2 Example for ATSAM
The example below will explain in detail the steps to follow for library selection.
Criteria
Microcontroller
IDE and compiler tool chain used
Selection
AT91SAM3S
IAR Workbench and GNU compiler
Notes
The GCC compiled
variant of the libraries for
the device selected needs
to be used.
Number of
Keys
required
for
the
3
Each key requires 1
application
Rotors and sliders required
Yes
QTouch acquisition
channel
Number of Rotors and Sliders required
Number of Channels required for the
application ( should be the sum of all
channels required for all the keys ,rotors
and sliders used in the design )
Charge cycle time required for the design
Number of SNS/SNSK port pairs needed
3
12
5 cycles
2 pairs
Each rotor / slider will
require 3 channels.
3 Keys + ( 3 rotors x 3
channels per rotor/slider )
? 12 channels
Assuming the device is
configured with a clock
frequency of 48Mhz
This is determined based
on the free PIO of the
board
Choice of ports available for the design
SNS/SNSK
SNS1 Port: A
The choice of ports for
Pair1 port
SNSK1 Port: A
the port pairs is limited
and can be found in the
section 5.7.1.5
SNS/SNSK
SNS2 Port: B
Pair 2 port
SNSK2 Port: B
Given the above requirements for the applications, the first step is to select the right library
variant required.
Step 1 : Selecting the right library variant
Referring to the library selection guide, we see that there are a few variants of libraries supported
for AT91SAM3S. One library is for IAR and the other is for GNU. If we want to use IAR
Workbench, we use the library name: libsam3s-32qt-k-8rs-iar.a.
Step 2 : Defining the constants / symbols in the project space
In IAR, change preprocessor options by adding the good defines:
_TOUCH_ARM_
_QTOUCH_
SNS1=B
SNSK1=B
SNS2=A
SNSK2=A
QT_NUM_CHANNELS=32
_ROTOR_SLIDER_
QT_DELAY_CYCLES=10
54
8207L-AT42-05/12
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