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