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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.
All code was written into anemometer file. Then after timer interrupt function inform that measurement hasn’t done and sets
flag start again.
21
. Then
interrupt handler functions can found. Flowchart take account whole code
inside anemometer file, which was created for this application. also contain programming examples, driver libraries and and header
files, which form application programming interface API. The rest are function calculate
peak peak value from ADC sequence, function make averages peak peak
values and wind calculation function.
After release notes include files, global variable with its defines can found.4.
It let know every time what was done and what has done.
On the bottom the code main function with its infinite while loop. Every part will be
described separately below.
For creation this diagrams LibreOffice Draw was used. Variable flag has defined all its states above.
Then function capture time from timer called. Below interrupt handler functions the rest of
functions can found. All them are called from main function, where the program
starts. permit us
using drive Stellaris driver API functions. Code continue with
a component functions. It’s divided into
sections and functions was illustrated above. Behind
that while loop start. It’s divided few section the beginning.
4.2 TI.
4. After digital input port interruption ADC sample function called. the
beginning the main are local variables with calling initialization function. From time time function calculate
temperature called.
After this initialization main function called. There are few condition inside. [15]
Within development code Stellaris peripheral driver library user's guide was
great aid [14]. the beginning initialization functions takes place. Their behavior controlled with flag global variable with its
definitions for every value. contain basic description all peripherals programming API.4.3 Code development
Code was developed Code composer studio 4. Constant variable timer_load_set used
to set time for timer interruption. also
includes example use every peripherals. First function preparing PWM for measurement chosen
axis. Variable adc_array is
used save here samples from converter. All orders, processes and functions
are accompanied with lot comments.4 Flowcharts
To describe how works our anemometer flowchart was created. Its value 31250 refers 2,5 with 12,5 MHz clock
speed. CCS was installed from
kit included CD. These conditions test flag global
variable and inside each concretes functions are called.1 Header files, Global variable and Defines
Included header files are chosen for used peripherals and microcontroller
