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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.
These conditions test flag global
variable and inside each concretes functions are called.3 Code development
Code was developed Code composer studio 4. All them are called from main function, where the program
starts. Its value 31250 refers 2,5 with 12,5 MHz clock
speed. permit us
using drive Stellaris driver API functions.
All code was written into anemometer file.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. Below interrupt handler functions the rest of
functions can found.
4. contain basic description all peripherals programming API.
It let know every time what was done and what has done. After digital input port interruption ADC sample function called.4. Every part will be
described separately below. [15]
Within development code Stellaris peripheral driver library user's guide was
great aid [14]. The rest are function calculate
peak peak value from ADC sequence, function make averages peak peak
values and wind calculation function. Then after timer interrupt function inform that measurement hasn’t done and sets
flag start again. All orders, processes and functions
are accompanied with lot comments. the beginning initialization functions takes place. From time time function calculate
temperature called. First function preparing PWM for measurement chosen
axis. Flowchart take account whole code
inside anemometer file, which was created for this application. It’s divided into
sections and functions was illustrated above. Variable adc_array is
used save here samples from converter. also contain programming examples, driver libraries and and header
files, which form application programming interface API.4.4 Flowcharts
To describe how works our anemometer flowchart was created. the
beginning the main are local variables with calling initialization function. Constant variable timer_load_set used
to set time for timer interruption. It’s divided few section the beginning. Behind
that while loop start. There are few condition inside.
Then function capture time from timer called. CCS was installed from
kit included CD.
For creation this diagrams LibreOffice Draw was used.
4.
21
.
After release notes include files, global variable with its defines can found.
On the bottom the code main function with its infinite while loop. Code continue with
a component functions. Then
interrupt handler functions can found. Variable flag has defined all its states above.
After this initialization main function called. also
includes example use every peripherals.2 TI
