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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.
permit us
using drive Stellaris driver API functions. Its value 31250 refers 2,5 with 12,5 MHz clock
speed. Below interrupt handler functions the rest of
functions can found.
On the bottom the code main function with its infinite while loop.4. also contain programming examples, driver libraries and and header
files, which form application programming interface API. CCS was installed from
kit included CD. After digital input port interruption ADC sample function called. All them are called from main function, where the program
starts. the
beginning the main are local variables with calling initialization function. There are few condition inside.
For creation this diagrams LibreOffice Draw was used. Behind
that while loop start. contain basic description all peripherals programming API.
21
. Every part will be
described separately below. Code continue with
a component functions. Flowchart take account whole code
inside anemometer file, which was created for this application.1 Header files, Global variable and Defines
Included header files are chosen for used peripherals and microcontroller. Their behavior controlled with flag global variable with its
definitions for every value. Then
interrupt handler functions can found.
All code was written into anemometer file. These conditions test flag global
variable and inside each concretes functions are called. It’s divided into
sections and functions was illustrated above. [15]
Within development code Stellaris peripheral driver library user's guide was
great aid [14].
4.
After release notes include files, global variable with its defines can found. Constant variable timer_load_set used
to set time for timer interruption.
4.
It let know every time what was done and what has done. also
includes example use every peripherals. First function preparing PWM for measurement chosen
axis. All orders, processes and functions
are accompanied with lot comments.3 Code development
Code was developed Code composer studio 4. Then after timer interrupt function inform that measurement hasn’t done and sets
flag start again. Variable flag has defined all its states above. Variable adc_array is
used save here samples from converter. the beginning initialization functions takes place. The rest are function calculate
peak peak value from ADC sequence, function make averages peak peak
values and wind calculation function.4 Flowcharts
To describe how works our anemometer flowchart was created.
Then function capture time from timer called.2 TI. From time time function calculate
temperature called. It’s divided few section the beginning.
After this initialization main function called.4
