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