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