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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.
Flowchart take account whole code
inside anemometer file, which was created for this application. First function preparing PWM for measurement chosen
axis. contain basic description all peripherals programming API. the beginning initialization functions takes place.
It let know every time what was done and what has done. Then
interrupt handler functions can found.3 Code development
Code was developed Code composer studio 4.
On the bottom the code main function with its infinite while loop.
4. [15]
Within development code Stellaris peripheral driver library user's guide was
great aid [14].
After this initialization main function called. permit us
using drive Stellaris driver API functions. Every part will be
described separately below. Variable flag has defined all its states above. Its value 31250 refers 2,5 with 12,5 MHz clock
speed. These conditions test flag global
variable and inside each concretes functions are called.
All code was written into anemometer file. Variable adc_array is
used save here samples from converter. It’s divided few section the beginning. CCS was installed from
kit included CD.
For creation this diagrams LibreOffice Draw was used. Code continue with
a component functions.
After release notes include files, global variable with its defines can found. Below interrupt handler functions the rest of
functions can found. All them are called from main function, where the program
starts. All orders, processes and functions
are accompanied with lot comments. Behind
that while loop start. also
includes example use every peripherals.4.4.4 Flowcharts
To describe how works our anemometer flowchart was created.1 Header files, Global variable and Defines
Included header files are chosen for used peripherals and microcontroller. Constant variable timer_load_set used
to set time for timer interruption. Their behavior controlled with flag global variable with its
definitions for every value. the
beginning the main are local variables with calling initialization function.
4. From time time function calculate
temperature called. After digital input port interruption ADC sample function called.
21
. There are few condition inside.
Then function capture time from timer called. Then after timer interrupt function inform that measurement hasn’t done and sets
flag start again. It’s divided into
sections and functions was illustrated above. also contain programming examples, driver libraries and and header
files, which form application programming interface API.2 TI. The rest are function calculate
peak peak value from ADC sequence, function make averages peak peak
values and wind calculation function
