I can't retrieve the timestamp from the ADXL355 driver

[llzz97]

This is my code,

#include <iiopp.h>

#include <iostream>
#include <iomanip>

using namespace iiopp;
using namespace std;

static ssize_t _sampleTriggerCB(const struct iio_channel *p_pChannel, void *p_pSrc, size_t p_szBytes, void *p_pData)
{
    Channel l_channel(const_cast<iio_channel *>(p_pChannel));
    std::string l_strChannelName(l_channel.id().c_str());
    cout << "Channel: " << quoted(l_strChannelName) << "\n";
    cout << "   value: " << quoted(to_string(value(l_channel))) << std::endl;

    return 1;
}

static void _triggerEvents()
{
    auto l_pContext = create_default_context();
    auto l_device(l_pContext->find_device("adxl355"));
    
    auto l_channelAccX(l_device.find_channel("accel_x", false));
    l_channelAccX.enable();
    auto l_channelAccY(l_device.find_channel("accel_y", false));
    l_channelAccY.enable();
    auto l_channelAccZ(l_device.find_channel("accel_z", false));
    l_channelAccZ.enable();
    auto l_channelTemp(l_device.find_channel("temp", false));
    l_channelTemp.enable();
    auto l_channelTimestamp(l_device.find_channel("timestamp", false));
    l_channelTimestamp.enable();

    auto l_buff(l_device.create_buffer(1, false));
    while (l_buff->for_each(_sampleTriggerCB, nullptr) > 0);
}

int main(int argc, char ** argv)
{
    try
    {
        _triggerEvents();
    }
    catch (error & e)
    {
        cerr << "ERROR " << e.code().value() << ": " << e.what() << endl;
        return EXIT_FAILURE;
    }

    return EXIT_SUCCESS;
}

I correctly receive all the other channels, but the timestamp is not working.
Am I doing something wrong?
I'm using version 0.25.

[llzz97]

I solved it, I was missing the call l_pBuff->refill() before l_buff->for_each.

#include <iiopp.h>

#include <iostream>
#include <iomanip>

using namespace iiopp;
using namespace std;

static ssize_t _sampleTriggerCB(const struct iio_channel *p_pChannel, void *p_pSrc, size_t p_szBytes, void *p_pData)
{
    Channel l_channel(const_cast<iio_channel *>(p_pChannel));
    std::string l_strChannelName(l_channel.id().c_str());
    cout << "Channel: " << quoted(l_strChannelName) << "\n";
    cout << "   value: " << quoted(to_string(value(l_channel))) << std::endl;

    return 1;
}

static void _triggerEvents()
{
    auto l_pContext = create_default_context();
    auto l_device(l_pContext->find_device("adxl355"));
    
    auto l_channelAccX(l_device.find_channel("accel_x", false));
    l_channelAccX.enable();
    auto l_channelAccY(l_device.find_channel("accel_y", false));
    l_channelAccY.enable();
    auto l_channelAccZ(l_device.find_channel("accel_z", false));
    l_channelAccZ.enable();
    auto l_channelTemp(l_device.find_channel("temp", false));
    l_channelTemp.enable();
    auto l_channelTimestamp(l_device.find_channel("timestamp", false));
    l_channelTimestamp.enable();

    auto l_buff(l_device.create_buffer(1, false));
    l_buff->refill();
    while (l_buff->for_each(_sampleTriggerCB, nullptr) > 0);
}

int main(int argc, char ** argv)
{
    try
    {
        _triggerEvents();
    }
    catch (error & e)
    {
        cerr << "ERROR " << e.code().value() << ": " << e.what() << endl;
        return EXIT_FAILURE;
    }

    return EXIT_SUCCESS;
}