IIO question with AD9361

Question

I'm starting with the ad9361-iiostream.c example and am trying to get the receiver's RSSI and gain status, but seem to be unable to 'find' the attribute. 
 I've tried to get it a few ways and nothing seems to work 
 1) iio_device_attr_read_double () from the ad9361-phy and channel voltage 0 asking for attribute "rssi" 
 2) iio_device_attr_read_double () from the ad9361-phy and channel voltage 0 asking for attribute "rssi" 
 3) iio_channel_attr_read_double () from cf-ad9361-A and channel voltage 0 asking for attribute "rssi" 
 I've been trying to rely on iio_info to tell me what are the valid current device/channel/attribute combinations but it seems not to be helping. 
 What am I missing? Is there a good primer that would help? 
 Thanks!

ADIApproved · Accepted Answer

Hi,

1) and 2) look the same to me

Here is some sample code that reads the IRSSI:

#include <iio.h>
#include <stdio.h>

int main(void)
{
    double value;
    struct iio_context *ctx = iio_create_default_context();
    struct iio_device *dev = iio_context_find_device(ctx, "ad9361-phy");
    struct iio_channel *ch = iio_device_find_channel(dev, "voltage0", false);
    int ret = iio_channel_attr_read_double(ch, "rssi", &value);
    if (ret < 0)
        printf("Unable to read RSSI: %i\n", ret);
    else
        printf("RSSI: %f\n", value);

    iio_context_destroy(ctx);
    return 0;
}

So 3) was right, but you used the wrong device (cf-ad9361-A instead of ad9361-phy).

-Paul

Electronic Design Services - PartnerZone

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IIO question with AD9361