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Kategorie: Diplomové, bakalářské práce |
Tento dokument chci!
Práce popisuje principy a problémy při realizaci ultrazvukového anemometru. Je popsán princip výpočtu rychlosti větru a následné korekce výpočtu. Pro realizaci jsou využity ultrazvukové sensory a microcontrolér ARM Cortex-M3. Práce se zabývá generováním PWM signálu, jeho analogovou filtrací, zesílením a odvysíláním. Na přijímací straně jeto nízkonapěťový zesilovač a komparátor. Vyvíjený kód je popsán pomocí vývojového diagramu.
From time time function calculate
temperature called. Every part will be
described separately below. These conditions test flag global
variable and inside each concretes functions are called. [15]
Within development code Stellaris peripheral driver library user's guide was
great aid [14].
Then function capture time from timer called.
For creation this diagrams LibreOffice Draw was used. It’s divided into
sections and functions was illustrated above. the
beginning the main are local variables with calling initialization function. Constant variable timer_load_set used
to set time for timer interruption. The rest are function calculate
peak peak value from ADC sequence, function make averages peak peak
values and wind calculation function.
All code was written into anemometer file.
After release notes include files, global variable with its defines can found.
4. contain basic description all peripherals programming API. Flowchart take account whole code
inside anemometer file, which was created for this application. Variable flag has defined all its states above. the beginning initialization functions takes place. Then
interrupt handler functions can found. also contain programming examples, driver libraries and and header
files, which form application programming interface API.
21
. First function preparing PWM for measurement chosen
axis. All orders, processes and functions
are accompanied with lot comments. All them are called from main function, where the program
starts. permit us
using drive Stellaris driver API functions.
It let know every time what was done and what has done. Their behavior controlled with flag global variable with its
definitions for every value. It’s divided few section the beginning.
On the bottom the code main function with its infinite while loop.
4.4 Flowcharts
To describe how works our anemometer flowchart was created. There are few condition inside. CCS was installed from
kit included CD. After digital input port interruption ADC sample function called.4.3 Code development
Code was developed Code composer studio 4.
After this initialization main function called.1 Header files, Global variable and Defines
Included header files are chosen for used peripherals and microcontroller.4. Below interrupt handler functions the rest of
functions can found. also
includes example use every peripherals.2 TI. Code continue with
a component functions. Variable adc_array is
used save here samples from converter. Behind
that while loop start. Its value 31250 refers 2,5 with 12,5 MHz clock
speed. Then after timer interrupt function inform that measurement hasn’t done and sets
flag start again
