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