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