Potential read errors for `bladerf_get_correction`

[QuantumEF]

BladeRf Version Info

BladeRf x40

 bladeRF-cli version:        1.9.0-git-fe3304d7
  libbladeRF version:         2.5.1-git-fe3304d7

  Firmware version:           2.4.0-git-a3d5c55f
  FPGA version:               0.14.0 (configured from SPI flash)

after setting BLADERF_CORR_DCOFF_I or BLADERF_CORR_DCOFF_Q to 0, reads from bladerf_get_correction output a value of 2048.

Further, setting values 0-15 inclusive also report 2048 while values 16-32 set it to 2064. This pattern seems to repeat.

C Test Script

#include <libbladeRF.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

const bladerf_channel CHANNEL = BLADERF_CHANNEL_TX(0);
int main(int argc, char *argv[]) {
  printf("Hello, World!\n");

  struct bladerf *dev = NULL;
  struct bladerf_devinfo dev_info;

  /* Initialize the information used to identify the desired device
   * to all wildcard (i.e., "any device") values */
  bladerf_init_devinfo(&dev_info);

  /* Request a device with the provided serial number.
   * Invalid strings should simply fail to match a device. */
  if (argc >= 2) {
    strncpy(dev_info.serial, argv[1], sizeof(dev_info.serial) - 1);
  }

  int status = bladerf_open_with_devinfo(&dev, &dev_info);
  if (status != 0) {
    fprintf(stderr, "Unable to open device: %s\n", bladerf_strerror(status));
    return 1;
  }

  // gets 2048 for inclusive values 0-15 and 2064 for 16-31, etc
  short int corr_i = 0;
  short int corr_q = 32;

  short int corr_phase = 0;
  short int corr_gain = 0;

  int res = 0;

  //

  res = bladerf_set_correction(dev, CHANNEL, BLADERF_CORR_DCOFF_I, corr_i);

  if (res != 0) {
    printf("Error: %d\n", res);
    return 1;
  }

  res = bladerf_get_correction(dev, CHANNEL, BLADERF_CORR_DCOFF_I, &corr_i);

  if (res != 0) {
    printf("Error: %d\n", res);
    return 1;
  }

  //

  res = bladerf_set_correction(dev, CHANNEL, BLADERF_CORR_DCOFF_Q, corr_q);

  if (res != 0) {
    printf("Error: %d\n", res);
    return 1;
  }

  res = bladerf_get_correction(dev, CHANNEL, BLADERF_CORR_DCOFF_Q, &corr_q);

  if (res != 0) {
    printf("Error: %d\n", res);
    return 1;
  }

  //

  res = bladerf_set_correction(dev, CHANNEL, BLADERF_CORR_PHASE, corr_phase);

  if (res != 0) {
    printf("Error: %d\n", res);
    return 1;
  }

  res = bladerf_get_correction(dev, CHANNEL, BLADERF_CORR_PHASE, &corr_phase);

  if (res != 0) {
    printf("Error: %d\n", res);
    return 1;
  }

  //

  res = bladerf_set_correction(dev, CHANNEL, BLADERF_CORR_GAIN, corr_gain);

  if (res != 0) {
    printf("Error: %d\n", res);
    return 1;
  }

  res = bladerf_get_correction(dev, CHANNEL, BLADERF_CORR_GAIN, &corr_gain);

  if (res != 0) {
    printf("Error: %d\n", res);
    return 1;
  }

  //

  printf("I: %d, Q: %d, Phase: %d, Gain: %d\n", corr_i, corr_q, corr_phase,
         corr_gain);

  return 0;
}

I originally noticed this with other program I am working on here.

Potentially, but probably unrelated (from a long time ago) issue: https://github.com/Nuand/bladeRF/issues/284