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examples: Remove heap allocation from C++ examples

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Cleanup of UPM C++ examples.  Switched from heap allocation to
stack allocation when possible.  This simplifies the samples since it
removes the need for explicit memory management.  A script was used to
identify and replace pointer use.  To simplify the replace script, I
re-formatted the C++ examples using the UPM .clang-format file.
Unfortuantely this changes the look of the UPM C++ examples to a large
degree.  However, examples will now have a standard look/feel and
uniform formatting.

    * Ran clang-format w/provided UPM .clang-format file
    * Removed new's/delete's whenever possible (left those in interface
      examples)
    * Added IIO sensor library implementation of callback void* arg
    * Converted all sleeps to upm defined delays (added header when
      necessary)
    * Scrubbed CXX example includes

Signed-off-by: Noel Eck <noel.eck@intel.com>
This commit is contained in:
Noel Eck
2017-08-30 15:00:29 -07:00
committed by Mihai Tudor Panu
parent bd6e4ec786
commit 5cefe7f5f3
290 changed files with 7976 additions and 8520 deletions
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53
examples/c++/ldt0028.cxx
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@ -22,69 +22,70 @@
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#include <unistd.h>
#include <iostream>
#include <iomanip>
#include <cmath>
#include <iomanip>
#include <iostream>
#include <stdint.h>
#include "ldt0028.hpp"
#include "upm_utilities.h"
int
main(int argc, char **argv)
main(int argc, char** argv)
{
//! [Interesting]
//! [Interesting]
const int NUMBER_OF_SECONDS = 10;
const int MICROSECONDS_PER_SECOND = 1000000;
const int SAMPLES_PER_SECOND = 50;
const int THRESHOLD = 100;
// Create the LDT0-028 Piezo Vibration Sensor object using AIO pin 0
upm::LDT0028* sensor = new upm::LDT0028(0);
upm::LDT0028 sensor(0);
// Read the signal every 20 milliseconds for 10 seconds
std::cout << "For the next " << NUMBER_OF_SECONDS << " seconds, "
<< SAMPLES_PER_SECOND << " samples will be taken every second."
<< std::endl << std::endl;
std::cout << "For the next " << NUMBER_OF_SECONDS << " seconds, " << SAMPLES_PER_SECOND
<< " samples will be taken every second." << std::endl
<< std::endl;
uint16_t buffer[NUMBER_OF_SECONDS * SAMPLES_PER_SECOND];
for (int i=0; i < NUMBER_OF_SECONDS * SAMPLES_PER_SECOND; i++) {
buffer[i] = (uint16_t) sensor->getSample();
usleep(MICROSECONDS_PER_SECOND / SAMPLES_PER_SECOND);
for (int i = 0; i < NUMBER_OF_SECONDS * SAMPLES_PER_SECOND; i++) {
buffer[i] = (uint16_t) sensor.getSample();
upm_delay_us(MICROSECONDS_PER_SECOND / SAMPLES_PER_SECOND);
}
// Print the number of times the reading was greater than the threshold
int count = 0;
for (int i=0; i < NUMBER_OF_SECONDS * SAMPLES_PER_SECOND; i++) {
for (int i = 0; i < NUMBER_OF_SECONDS * SAMPLES_PER_SECOND; i++) {
if (buffer[i] > THRESHOLD) {
count++;
}
}
std::cout << sensor->name() << " exceeded the threshold value of " <<
THRESHOLD << " a total of " << count << " times," << std::endl
<< "out of a total of " << NUMBER_OF_SECONDS*SAMPLES_PER_SECOND
<< " readings." << std::endl << std::endl;
std::cout << sensor.name() << " exceeded the threshold value of " << THRESHOLD << " a total of "
<< count << " times," << std::endl
<< "out of a total of " << NUMBER_OF_SECONDS * SAMPLES_PER_SECOND << " readings."
<< std::endl
<< std::endl;
// Print a graphical representation of the average value sampled
// each second for the past 10 seconds, using a scale factor of 15
std::cout << "Now printing a graphical representation of the average reading "
<< std::endl << "each second for the last "
<< NUMBER_OF_SECONDS << " seconds." << std::endl;
std::cout << "Now printing a graphical representation of the average reading " << std::endl
<< "each second for the last " << NUMBER_OF_SECONDS << " seconds." << std::endl;
const int SCALE_FACTOR = 15;
for (int i=0; i < NUMBER_OF_SECONDS; i++) {
for (int i = 0; i < NUMBER_OF_SECONDS; i++) {
long sum = 0;
for (int j=0; j < SAMPLES_PER_SECOND; j++) {
sum += buffer[i*SAMPLES_PER_SECOND + j];
for (int j = 0; j < SAMPLES_PER_SECOND; j++) {
sum += buffer[i * SAMPLES_PER_SECOND + j];
}
double average = (double) sum / (double) SAMPLES_PER_SECOND;
int stars_to_print = (int) round(average / SCALE_FACTOR);
std::cout << "(" << std::setw(4) << (int) round(average) << ") | ";
for (int j=0; j<stars_to_print; j++) {
for (int j = 0; j < stars_to_print; j++) {
std::cout << "*";
}
std::cout << std::endl;
}
// Delete the sensor object
delete sensor;
//! [Interesting]
//! [Interesting]
return 0;
}