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examples: Cleanup C++ examples

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Modify the C++ examples to be of same coding standard like C. As a
part of this cleanup, a new LED example is also added.

Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: Brendan Le Foll <brendan.le.foll@intel.com>
This commit is contained in:
Manivannan Sadhasivam
2018-01-24 15:09:29 +05:30
committed by Brendan Le Foll
parent eaaebae69d
commit 83a67b96fd
13 changed files with 463 additions and 225 deletions
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173
examples/c++/iio.cpp Normal file
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/*
* Author: Henry Bruce
* Copyright (c) 2015 Intel Corporation.
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
* Example usage: Sets accelerometer scale and registers for the threshold event
*
*/
/* standard headers */
#include <float.h>
#include <iostream>
#include <math.h>
#include <signal.h>
#include <stdlib.h>
#include <unistd.h>
/* mraa headers */
#include "mraa/common.hpp"
#include "mraa/iio.hpp"
#define EXPECT_FAILURE 0
#define EXPECT_SUCCESS 1
#define IIO_TRY(func) \
{ \
bool success = true; \
try { \
iio_device->func; \
} catch (std::exception & e) { \
success = false; \
} \
log_result(#func, "", true, success); \
}
// Macro to run IIO method on attribute and log output
#define IIO_RUN(func, attr, value, expect) \
{ \
std::string attr_name = attr; \
bool success = true; \
try { \
iio_device->func(attr_name, value); \
} catch (std::exception & e) { \
success = false; \
} \
log_result(#func, attr_name, expect, success); \
}
// Macro to run IIO method on attribute and check for expected result and log output
#define IIO_TEST(func, attr, value, expect) \
{ \
std::string attr_name = attr; \
bool success = false; \
try { \
success = fabs(iio_device->func(attr_name) - value) < FLT_EPSILON; \
} catch (std::exception & e) { \
success = false; \
} \
log_result(#func, attr_name, expect, success); \
}
mraa::Iio* iio_device;
int eventCount = 0;
// Log result of test. Note a "fail" (i.e. success is false) will be displayed as a pass if a fail
// was expected
void
log_result(std::string test_name, std::string attr_name, bool expect_success, bool success)
{
std::string result;
if (expect_success)
result = success ? "PASS" : "FAIL";
else
result = success ? "FAIL" : "PASS";
if (attr_name.empty())
std::cout << "%s: %s" << test_name.c_str() << result.c_str() << std::endl;
else
std::cout << "%s(%s): %s" << test_name.c_str() << attr_name.c_str() << result.c_str() << std::endl;
}
// Generate iio_dummy driver event by writing a string to a specific sysfs node
bool
generate_event()
{
FILE* fp = fopen("/sys/bus/iio/devices/iio_evgen/poke_ev0", "w");
if (fp == NULL)
return false;
fprintf(fp, "1\n");
fclose(fp);
return true;
}
// IIO event handler that checks for event from dummy_iio_evgen driver
class IioTestHandler : public mraa::IioHandler
{
protected:
void
onIioEvent(const mraa::IioEventData& eventData)
{
if (eventData.channelType == IIO_VOLTAGE && eventData.direction == IIO_EV_DIR_RISING &&
eventData.type == IIO_EV_TYPE_THRESH)
eventCount++;
}
};
int
main(void)
{
//! [Interesting]
IioTestHandler testHandler;
std::string deviceName;
try {
mraa::Iio* iio_device0 = new mraa::Iio(0);
std::cout << "IIO device 0 found by id." << std::endl;
deviceName = iio_device0->getDeviceName();
delete iio_device0;
} catch (std::exception& e) {
std::cerr << "IIO device 0 not found." << std::endl;
return EXIT_FAILURE;
}
try {
mraa::Iio* iio_device1 = new mraa::Iio(1);
delete iio_device1;
} catch (std::exception& e) {
std::cerr << "IIO device 1 not found. This is expected behavior." << std::endl;
}
try {
iio_device = new mraa::Iio(deviceName);
std::cout << "IIO device 0 found by name." << std::endl;
} catch (std::exception& e) {
std::cerr << "IIO device 0 not found." << std::endl;
return EXIT_FAILURE;
}
std::cout << "Using IIO device0. Name is " << iio_device->getDeviceName() << std::endl;
IIO_RUN(writeFloat, "in_accel_x_raw", 100, EXPECT_FAILURE);
IIO_RUN(writeFloat, "in_voltage0_scale", 100, EXPECT_FAILURE);
IIO_RUN(writeInt, "out_voltage0_raw", 100, EXPECT_SUCCESS);
IIO_TEST(readInt, "in_accel_x_raw", 34, EXPECT_SUCCESS);
IIO_TEST(readFloat, "in_voltage0_scale", 0.001333, EXPECT_SUCCESS);
IIO_RUN(writeInt, "events/in_voltage0_thresh_rising_en", 1, EXPECT_SUCCESS);
IIO_TRY(registerEventHandler(&testHandler));
eventCount = 0;
generate_event();
usleep(500000);
log_result("eventReceived", "", (eventCount == 1), true);
//! [Interesting]
delete iio_device;
return EXIT_SUCCESS;
}