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| 型号： | ATAVRQTOUCHX |
| 厂商： | Atmel |
| 文件页数： | 48/185页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL CAPACITIVE TOUCH |
| 产品培训模块： | Touch Interface Solutions Qtouch- Create your own Touch Application megaAVR Introduction |
| 特色产品： | ATAVRXPLAIN Evaluation & Demonstration Kit |
| 标准包装： | 1 |
| 系列： | QTouch™ |
| 传感器类型： | 触摸，电容式 |
| 传感范围： | 1 个滑块，1 个转轮，2 个按钮 |
| 接口： | USB |
| 电源电压： | 5V，USB |
| 嵌入式： | 是，MCU，8 位 |
| 已供物品： | 板 |
| 已用 IC / 零件： | AT90USB1287，ATxmega128A1 |
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Channel3 is formed by PA6 and PA7 pin with signal count 150
In the above case, the no of times interrupts disabled will be 300 (maximum signal count) as all
four channels burst together in case of intraport.
4 channel interport case:
Channel0 is formed by PA0 and PB0 pin with signal count 300.
Channel1 is formed by PA1 and PB1 pin with signal count 200.
Channel2 is formed by PA2 and PB2 pin with signal count 250
Channel3 is formed by PA3 and PB3 pin with signal count 150
In the above case, as bursting happens in odd and even pairs, so maximum signal counts in case
of both even and odd channels will be taken. Maximum signal count out of even channels
channel0 and channel2 is 300 and maximum signal count out of odd channels channel1 and
channel3 is 250.So total number of times interrupts disabled will be (300 + 250 = 550).
The recommended maximum ISR execution time is 1msec.If ISR time exceeds 1 ms then it may
result in charge leakage which will further lead to rise in signal value. Noise observed in the signal
value will increase. The 1msec ISR limit applies to the total time spent in an ISR during one
acquisition period, and applies only to QTouch and QMatrix. One acquisition period is the time to
complete one burst sequence. This will be the time required to do the 300 pulses situation in the
first example above. In the second example above the 1msec limitation applies to the 300 and
then the 250 pulses; 1msec of total ISR can occur during the 300 and another 1msec ISR can
occur during the 250. This is all about self discharge happening while doing a burst. In the
example below it would be perfectly OK to have a 1msec ISR happening every 5 msec.
If the ISR load is constant and synced with the acquisition (meaning the ISR takes a constant
amount of time and executes in the same amount of time during each burst sequence), the signal
will not suffer at all since the self discharge will be the same every time the acquisition is run. If
there is a strong variation in the total ISR execution time during acquisition this will appear as
noise in the signal due to the variable self discharge of the sample cap.
The time to execute one measurement will depend on various parameters like sampling
capacitor, operating voltage, and different software parameters like QT_DELAY_CYCLES, CPU
frequency.
For single button with below parameters
Sampling Capacitor = 10 nf
CPU Freq= 4 MHZ
VCC= 5V
QT_DELAY_CYCLES=1
Qtouch takes around 2.6 msec for one channel.
Please note that none of the API functions should be called from a user interrupt.
5.6.10 Integrating QTouch libraries in your application
This section illustrates the key steps required in integrating the QTouch library in your application.
5.6.10.1 Directory structure of the library files
The QTouch library directory structure is as listed below
What
Root
installation
Header file
Where
Default directory is
C:\Program
Files\Atmel\Atmel_QTouch_Libraries_5.x\Generic_QTouch_Libraries
..\include
Comments
This is the default
directory path but the user
can install the directory in
desired location.
touch_api.h is located in
this
48
8207L-AT42-05/12
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