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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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115
examples/c++/pn532-writeurl.cxx
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@ -22,8 +22,11 @@
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#include <unistd.h>
#include <iostream>
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include "pn532.hpp"
using namespace std;
@ -32,84 +35,74 @@ using namespace std;
// NOTE: this cannot exceed 34 characters.
static char url[] = "iotdk.intel.com";
int main(int argc, char **argv)
int
main(int argc, char** argv)
{
//! [Interesting]
// Instantiate an PN532 on I2C bus 0 (default) using gpio 3 for the
// IRQ, and gpio 2 for the reset pin.
//! [Interesting]
// Instantiate an PN532 on I2C bus 0 (default) using gpio 3 for the
// IRQ, and gpio 2 for the reset pin.
upm::PN532 *nfc = new upm::PN532(3, 2);
upm::PN532 nfc(3, 2);
if (!nfc->init())
cerr << "init() failed" << endl;
if (!nfc.init())
cerr << "init() failed" << endl;
uint32_t vers = nfc->getFirmwareVersion();
uint32_t vers = nfc.getFirmwareVersion();
if (vers)
printf("Got firmware version: 0x%08x\n", vers);
else
{
printf("Could not identify PN532\n");
return 1;
if (vers)
printf("Got firmware version: 0x%08x\n", vers);
else {
printf("Could not identify PN532\n");
return 1;
}
// Now scan and identify any cards that come in range (1 for now)
// Now scan and identify any cards that come in range (1 for now)
// Retry forever
nfc->setPassiveActivationRetries(0xff);
// Retry forever
nfc.setPassiveActivationRetries(0xff);
nfc->SAMConfig();
nfc.SAMConfig();
uint8_t uidSize;
uint8_t uid[7];
uint8_t uidSize;
uint8_t uid[7];
bool foundCard = false;
while (!foundCard)
{
memset(uid, 0, 7);
if (nfc->readPassiveTargetID(nfc->BAUD_MIFARE_ISO14443A,
uid, &uidSize, 2000))
{
// found a card
printf("Found a card: UID len %d\n", uidSize);
printf("UID: ");
for (int i = 0; i < uidSize; i++)
printf("%02x ", uid[i]);
printf("\n");
printf("SAK: 0x%02x\n", nfc->getSAK());
printf("ATQA: 0x%04x\n\n", nfc->getATQA());
foundCard = true;
}
else
{
printf("Waiting for a card...\n");
bool foundCard = false;
while (!foundCard) {
memset(uid, 0, 7);
if (nfc.readPassiveTargetID(nfc.BAUD_MIFARE_ISO14443A, uid, &uidSize, 2000)) {
// found a card
printf("Found a card: UID len %d\n", uidSize);
printf("UID: ");
for (int i = 0; i < uidSize; i++)
printf("%02x ", uid[i]);
printf("\n");
printf("SAK: 0x%02x\n", nfc.getSAK());
printf("ATQA: 0x%04x\n\n", nfc.getATQA());
foundCard = true;
} else {
printf("Waiting for a card...\n");
}
}
if (uidSize != 7)
{
printf("This example will only write an NDEF URI to preformatted\n");
printf("Mifare Ultralight or NTAG2XX tags\n");
return 1;
if (uidSize != 7) {
printf("This example will only write an NDEF URI to preformatted\n");
printf("Mifare Ultralight or NTAG2XX tags\n");
return 1;
}
// 48 bytes is maximum data area on ultralight cards, so we use that
// as the maximum datasize here. Obviously if you have a bigger
// card, you can write more data.
if (!nfc->ntag2xx_WriteNDEFURI(nfc->NDEF_URIPREFIX_HTTP, url, 48))
{
// failure
printf("Failed to write NDEF record tag.\n");
return 1;
// 48 bytes is maximum data area on ultralight cards, so we use that
// as the maximum datasize here. Obviously if you have a bigger
// card, you can write more data.
if (!nfc.ntag2xx_WriteNDEFURI(nfc.NDEF_URIPREFIX_HTTP, url, 48)) {
// failure
printf("Failed to write NDEF record tag.\n");
return 1;
}
printf("Success, URL record written to tag.\n");
printf("Success, URL record written to tag.\n");
//! [Interesting]
//! [Interesting]
delete nfc;
return 0;
return 0;
}