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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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31
examples/c++/mcp2515.cxx
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@ -22,58 +22,55 @@
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#include <unistd.h>
#include <stdio.h>
#include <iostream>
#include <string>
#include "mcp2515.hpp"
#include "mcp2515_regs.h"
using namespace std;
int main(int argc, char **argv)
int
main(int argc, char** argv)
{
//! [Interesting]
//! [Interesting]
// Instantiate a MCP2515 on SPI bus 0 using a hw CS pin (-1).
upm::MCP2515 *sensor = new upm::MCP2515(0, -1);
upm::MCP2515 sensor(0, -1);
cout << "Setting loopback mode..." << endl;
// set the mode to loopback mode. In loopback mode, transmitted
// packets are sent directly to an appropriate receive buffer
// without actually going out onto the CAN bus.
sensor->setOpmode(MCP2515_OPMODE_LOOPBACK);
sensor.setOpmode(MCP2515_OPMODE_LOOPBACK);
// lets build up a packet and try loading it (8 bytes max).
string myPayload = "01234567";
cout << "Loading a packet of 8 numbers (0-7) into a TX buffer..." << endl;
sensor->loadTXBuffer(MCP2515_TX_BUFFER0, 0, false, false, myPayload);
sensor.loadTXBuffer(MCP2515_TX_BUFFER0, 0, false, false, myPayload);
// now lets try to transmit it
cout << "Transmitting packet..." << endl;
sensor->transmitBuffer(MCP2515_TX_BUFFER0, true);
sensor.transmitBuffer(MCP2515_TX_BUFFER0, true);
cout << "Transmit successful" << endl;
// There should now be a packet waiting for us in RXB0
if (sensor->rxStatusMsgs() == MCP2515_RXMSG_RXB0)
{
if (sensor.rxStatusMsgs() == MCP2515_RXMSG_RXB0) {
cout << "Packet received in RXB0, decoding..." << endl;
// now lets retrieve and print it
sensor->getRXMsg(MCP2515_RX_BUFFER0);
sensor.getRXMsg(MCP2515_RX_BUFFER0);
sensor->printMsg();
}
else
{
sensor.printMsg();
} else {
cout << "No packet found, how strange." << endl;
}
cout << "Exiting..." << endl;
delete sensor;
//! [Interesting]
//! [Interesting]
return 0;
}