### Perform an immediate segmented I/Q capture

Source: https://signalhound.com/sigdownloads/SDK/online_docs/sm_api/iq_segmented.html

Configures the device for a single-segment immediate trigger capture and retrieves the I/Q data. This example is specific to SM200B and SM435B hardware.

```cpp
// SM200B/SM435B only.
// This example demonstrates setting up a single immediate triggered I/Q capture
// using the 160MHz I/Q capture capabilities of the SM200B/SM435B. This examples uses the
// convenience function for completing the capture. See the "imm_manual" example for a full
// example.
#include "sm_api.h"
#include <vector>
void sm_example_segmented_iq_imm_simple()
{
// Number of I/Q samples, 50 million, 1/5th of a second
const int CAPTURE_LEN = 50e6;
int handle = -1;
SmStatus status = smOpenDevice(&handle);
if(status != smNoError) {
// Unable to open device
const char *errStr = smGetErrorString(status);
return;
}
// Verify device has segmented I/Q capture capability
SmDeviceType deviceType;
smGetDeviceInfo(handle, &deviceType, 0);
if(deviceType != smDeviceTypeSM200B && deviceType != smDeviceTypeSM435B) {
// Invalid device type
smCloseDevice(handle);
return;
}
// Set device reference level, maximum expected input signal
status = smSetRefLevel(handle, 0.0);
// Configure the 160MHz capture
status = smSetSegIQDataType(handle, smDataType32fc);
status = smSetSegIQCenterFreq(handle, 2.45e9);
// Setup a single segment capture
status = smSetSegIQSegmentCount(handle, 1);
status = smSetSegIQSegment(handle, 0, smTriggerTypeImm, 0, CAPTURE_LEN, 0.0);
status = smConfigure(handle, smModeIQSegmentedCapture);
if(status != smNoError) {
// Unable to configure device
const char *errStr = smGetErrorString(status);
return;
}
// 2 floats for each I/Q sample
std::vector<float> buf(CAPTURE_LEN * 2);
int64_t nsSinceEpoch = 0;
SmBool timedOut = smFalse;
// This example uses the convenience function for completing the capture.
// See the manual example for performing the full sequence of capture functions.
// Immediate triggered acquisitions can't time out, so we ignore the timeout.
status = smSegIQCaptureFull(handle, 0, buf.data(), 0, CAPTURE_LEN, &nsSinceEpoch, &timedOut);
// Do something with data
smAbort(handle);
smCloseDevice(handle);
}
```

--------------------------------

### Configure and Stream I/Q Data

Source: https://signalhound.com/sigdownloads/SDK/online_docs/sm_api/iq_streaming.html

Demonstrates the workflow for opening a device, configuring I/Q parameters, and streaming data into a buffer.

```cpp
// Configure the device for I/Q streaming and stream for a period of time 
// This example assumes a USB 3.0 SM device.
#include <cstdio>
#include <cstdlib>
#include <vector>
#include "sm_api.h"
void sm_example_iq_stream()
{
int handle = -1;
SmStatus status = smNoError;
// Uncomment this to open a USB SM device
status = smOpenDevice(&handle);
// Uncomment this to open a networked SM device with a default network config
//status = smOpenNetworkedDevice(&handle, SM_ADDR_ANY, SM_DEFAULT_ADDR, SM_DEFAULT_PORT);
// Check open status
if(status != smNoError) {
printf("Unable to open device\n");
exit(-1);
}
// Configure the receiver for IQ acquisition
smSetRefLevel(handle, -20.0); // -20 dBm reference level
smSetIQCenterFreq(handle, 900.0e6); // 900MHz center frequency
smSetIQBaseSampleRate(handle, smIQStreamSampleRateNative); // Use native 50MS/s base sample rate.
smSetIQSampleRate(handle, 2); // 50 / 2 = 25MS/s IQ 
smSetIQBandwidth(handle, smTrue, 20.0e6); // 20MHz of bandwidth
smSetIQDataType(handle, smDataType32fc);
// Initialize the receiver with the above settings
status = smConfigure(handle, smModeIQ);
if(status != smNoError) {
printf("Unable to configure device\n");
printf("%s\n", smGetErrorString(status));
smCloseDevice(handle);
exit(-1);
}
// Query the receiver IQ stream characteristics
// Should match what we set earlier
double actualSampleRate, actualBandwidth;
smGetIQParameters(handle, &actualSampleRate, &actualBandwidth);
// Allocate memory for complex sample, IQ pairs interleaved
int bufLen = 16384;
std::vector<float> iqBuf(bufLen * 2);
// Let's acquire 5 second worth of data
int samplesNeeded = 5 * (int)actualSampleRate;
while(samplesNeeded > 0) {
// Notice the purge parameter is set to false, so that each time
// the get IQ function is called, the next contiguous block of data
// is returned.
smGetIQ(handle, &iqBuf[0], bufLen, 0, 0, 0, smFalse, 0, 0);
// Process/store data here
// Data is interleaved 32-bit complex values
// Need bufLen less samples
samplesNeeded -= bufLen;
}
// Finished
smCloseDevice(handle);
}
```

--------------------------------

### Calculate Frequency for Sweep Elements

Source: https://signalhound.com/sigdownloads/SDK/online_docs/sm_api/sweep_mode.html

Formula to determine the frequency of a specific element in a sweep array using start frequency and bin size.

```text
Frequency of N'th element in sweep = StartFreq + N * BinSize
```

--------------------------------

### Configure and Retrieve Real-Time Spectrum Data

Source: https://signalhound.com/sigdownloads/SDK/online_docs/sm_api/real_time.html

Demonstrates the full workflow for initializing a device, configuring real-time parameters, and retrieving sweep and frame data.

```cpp
#include <cstdio>
#include <cstdlib>
#include "sm_api.h"
static void checkStatus(SmStatus status)
{
if(status > 0) { // Warning
printf("Warning: %s\n", smGetErrorString(status));
return;
} else if(status < 0) { // Error
printf("Error: %s\n", smGetErrorString(status));
exit(-1);
}
}
void sm_example_real_time()
{
int handle = -1;
SmStatus status = smNoError;
// Uncomment this to open a USB SM device
status = smOpenDevice(&handle);
// Uncomment this to open a networked SM device with a default network config
//status = smOpenNetworkedDevice(&handle, SM_ADDR_ANY, SM_DEFAULT_ADDR, SM_DEFAULT_PORT);
// Check open status
checkStatus(status);
// Configure the measurement
smSetRefLevel(handle, -20.0); // -20dBm reference level
smSetRealTimeCenterSpan(handle, 2.45e9, 160.0e6); // 160MHz span at 2.45GHz center freq
smSetRealTimeRBW(handle, 30.0e3); // 30kHz min RBW with Nuttall window
smSetRealTimeDetector(handle, smDetectorMinMax);
smSetRealTimeScale(handle, smScaleLog, -20.0, 100.0); // On the frame, ref of -20, 100dB height
smSetRealTimeWindow(handle, smWindowNutall);
// Initialize the measurement
status = smConfigure(handle, smModeRealTime);
checkStatus(status);
// Get the configured measurement parameters as reported by the receiver
double actualRBW, actualStart, binSize, poi;
int sweepSize, frameWidth, frameHeight;
smGetRealTimeParameters(handle, &actualRBW, &sweepSize, &actualStart,
&binSize, &frameWidth, &frameHeight, &poi);
// Create memory for our sweep and frame
float *sweep = new float[sweepSize];
float *frame = new float[frameWidth * frameHeight];
// Retrieve a series of sweeps/frames
for(int i = 0; i < 100; i++) {
// Retrieve just the color frame and max sweep.
smGetRealTimeFrame(handle, frame, nullptr, nullptr, sweep, nullptr, nullptr);
// Do something with data here
}
// Done with the device
smAbort(handle);
smCloseDevice(handle);
// Clean up
delete [] sweep;
delete [] frame;
}
```

--------------------------------

### Configure and Perform a Single Sweep

Source: https://signalhound.com/sigdownloads/SDK/online_docs/sm_api/sweep_mode.html

Demonstrates initializing a device, configuring sweep parameters, and retrieving sweep data.

```cpp
// Configure the device for sweeps and perform a single sweep.
#include <cstdio>
#include <cstdlib>
#include <vector>
#include "sm_api.h"
void sm_example_sweep()
{
int handle = -1;
SmStatus status = smNoError;
// Uncomment this to open a USB SM device
status = smOpenDevice(&handle);
// Uncomment this to open a networked SM device with a default network config
//status = smOpenNetworkedDevice(&handle, SM_ADDR_ANY, SM_DEFAULT_ADDR, SM_DEFAULT_PORT);
// Check open status
if(status != smNoError) {
printf("Unable to open device\n");
exit(-1);
}
// Configure the sweep
smSetRefLevel(handle, -20.0); // -20dBm reference level
smSetSweepCenterSpan(handle, 2.45e9, 100.0e6); // ISM band
smSetSweepCoupling(handle, 10.0e3, 10.0e3, 0.001); // 10kHz rbw/vbw, 1ms acquisition
smSetSweepDetector(handle, smDetectorAverage, smVideoPower); // average power detector
smSetSweepScale(handle, smScaleLog); // return sweep in dBm
smSetSweepWindow(handle, smWindowFlatTop);
smSetSweepSpurReject(handle, smFalse); // No software spur reject
// Initialize the device for sweep measurement mode
status = smConfigure(handle, smModeSweeping);
if(status != smNoError) {
printf("Unable to configure device\n");
printf("%s\n", smGetErrorString(status));
smCloseDevice(handle);
exit(-1);
}
// Get the configured sweep parameters as reported by the receiver
double actualRBW, actualVBW, actualStartFreq, binSize;
int sweepSize;
smGetSweepParameters(handle, &actualRBW, &actualVBW, &actualStartFreq, &binSize, &sweepSize);
// Create memory for our sweep
std::vector<float> sweep(sweepSize);
// Get sweep, ignore the min sweep and the sweep time
status = smGetSweep(handle, nullptr, sweep.data(), nullptr);
if(status != smNoError) {
printf("Sweep status: %s\n", smGetErrorString(status));
}
// Done with the device
smCloseDevice(handle);
}
```

--------------------------------

### Retrieve VRT Context and Data Packets in C++

Source: https://signalhound.com/sigdownloads/SDK/online_docs/sm_api/iq_v_r_t.html

Demonstrates the workflow for opening a networked device, configuring VRT streaming parameters, allocating memory, and fetching context and data packets.

```cpp
/*
* Get a VRT Context packet from a Signal Hound SM Series device followed by a block of 1000 Signal Data packets
*
*/
#include "sm_api.h"
#include "sm_api_vrt.h"
#pragma comment(lib, "sm_api")
void getVRTPackets() {
// Set up device
int device = -1;
//SmStatus status = smOpenDevice(&device); // USB
SmStatus status = smOpenNetworkedDevice(&device, SM_ADDR_ANY, SM_DEFAULT_ADDR, SM_DEFAULT_PORT); // Networked
if(status != smNoError) {
// Could not open Sm Series device
}
// Set IQ parameters
smSetIQCenterFreq(device, 3.0e9);
smSetIQSampleRate(device, 2);
smSetIQBandwidth(device, smTrue, 20.0e6);
smSetRefLevel(device, -20);
// Set VRt parameters
smSetVrtStreamID(device, 1);
smSetVrtPacketSize(device, 16384);
// Configure
status = smConfigure(device, smModeIQStreaming); // VRT mode
if(status != smNoError) {
// Could not configure SM Series device
}
// Allocate memory
uint32_t contextWordCount;
status = smGetVrtContextPktSize(device, &contextWordCount);
if(status != smNoError) {
// Could not get context packet size
}
const int dataPacketCount = 1000;
uint16_t samplesPerPkt;
uint32_t dataWordCount;
status = smGetVrtPacketSize(device, &samplesPerPkt, &dataWordCount);
if(status != smNoError) {
// Could not get data packet size and word count
}
uint32_t wordCount = contextWordCount + dataWordCount * dataPacketCount;
uint32_t *words = new uint32_t[wordCount];
uint32_t *curr = words;
// Get context packet
uint32_t actualContextWordCount;
status = smGetVrtContextPkt(device, curr, &actualContextWordCount);
if(status != smNoError) {
// Could not get context packet
}
if(actualContextWordCount != contextWordCount) {
// Context packet is not the expected size
}
curr += contextWordCount;
// Get data packets
uint32_t actualDataWordCount;
status = smGetVrtPackets(device, curr, &actualDataWordCount, dataPacketCount, smFalse);
if(status != smNoError) {
// Could not get data packets
}
if(actualDataWordCount != dataWordCount * dataPacketCount) {
// Block of data packets is not the expected size
}
smCloseDevice(device);
if(words) delete[] words;
}
```

--------------------------------

### smGetIQ

Source: https://signalhound.com/sigdownloads/SDK/online_docs/sm_api/iq_streaming.html

Retrieves I/Q samples from the device.

```APIDOC
## smGetIQ

### Description
Retrieves a block of I/Q samples from the device buffer.

### Signature
`SmStatus smGetIQ(int device, void *iqBuf, int iqBufSize, double *triggers, int triggerBufSize, int64_t *nsSinceEpoch, SmBool purge, int *sampleLoss, int *samplesRemaining)`
```

--------------------------------

### smIQSweepListGetSweep

Source: https://signalhound.com/sigdownloads/SDK/online_docs/sm_api/iq_sweep_list.html

Executes the configured I/Q sweep list and retrieves the data.

```APIDOC
## smIQSweepListGetSweep

### Description
Performs the I/Q sweep list capture and populates the provided buffer with the resulting data and timestamps.

### Signature
`SmStatus smIQSweepListGetSweep(int device, void *dst, int64_t *timestamps)`

### Parameters
- **device** (int) - The device handle.
- **dst** (void*) - Pointer to the memory buffer to store the I/Q data.
- **timestamps** (int64_t*) - Pointer to an array to store the timestamps for each step.
```

--------------------------------

### Real-Time Configuration Functions

Source: https://signalhound.com/sigdownloads/SDK/online_docs/sm_api/sm__api_8h_source.html

Functions for configuring real-time analysis parameters.

```c
SM_API SmStatus smSetRealTimeCenterSpan(int device, double centerFreqHz, double spanHz);
```

```c
SM_API SmStatus smSetRealTimeRBW(int device, double rbw);
```

```c
SM_API SmStatus smSetRealTimeDetector(int device, SmDetector detector);
```

```c
SM_API SmStatus smSetRealTimeScale(int device, SmScale scale, double frameRef, double frameScale);
```

```c
SM_API SmStatus smSetRealTimeWindow(int device, SmWindowType window);
```

--------------------------------

### smConfigure

Source: https://signalhound.com/sigdownloads/SDK/online_docs/sm_api/iq_streaming.html

Configures the device mode.

```APIDOC
## smConfigure

### Description
Applies the current settings to the device for a specific mode (e.g., I/Q streaming).

### Signature
`SmStatus smConfigure(int device, SmMode mode)`
```

--------------------------------

### IQ Streaming Configuration Functions

Source: https://signalhound.com/sigdownloads/SDK/online_docs/sm_api/sm__api_8h_source.html

Functions for configuring IQ data streaming parameters.

```c
SM_API SmStatus smSetIQBaseSampleRate(int device, SmIQStreamSampleRate sampleRate);
```

```c
SM_API SmStatus smSetIQDataType(int device, SmDataType dataType);
```

```c
SM_API SmStatus smSetIQCenterFreq(int device, double centerFreqHz);
```

```c
SM_API SmStatus smGetIQCenterFreq(int device, double *centerFreqHz);
```

```c
SM_API SmStatus smSetIQSampleRate(int device, int decimation);
```

```c
SM_API SmStatus smSetIQBandwidth(int device, SmBool enableSoftwareFilter, double bandwidth);
```

```c
SM_API SmStatus smSetIQExtTriggerEdge(int device, SmTriggerEdge edge);
```

```c
SM_API SmStatus smSetIQTriggerSentinel(double sentinelValue);
```

```c
SM_API SmStatus smSetIQQueueSize(int device, float ms);
```

--------------------------------

### smGetDeviceList

Source: https://signalhound.com/sigdownloads/SDK/online_docs/sm_api/sm__api_8h_source.html

Enumerates all connected Signal Hound devices.

```APIDOC
## smGetDeviceList

### Description
Retrieves a list of serial numbers for all currently connected devices.

### Signature
`SmStatus smGetDeviceList(int *serials, int *deviceCount)`
```

--------------------------------

### smOpenDevice

Source: https://signalhound.com/sigdownloads/SDK/online_docs/sm_api/sm__api_8h_source.html

Opens a connection to a Signal Hound SM device.

```APIDOC
## smOpenDevice

### Description
Opens a connection to a Signal Hound SM device and returns a device handle.

### Signature
`SmStatus smOpenDevice(int *device)`
```

--------------------------------

### smOpenDevice

Source: https://signalhound.com/sigdownloads/SDK/online_docs/sm_api/iq_streaming.html

Opens a USB SM device.

```APIDOC
## smOpenDevice

### Description
Opens a connection to a USB SM device.

### Signature
`SmStatus smOpenDevice(int *device)`
```

--------------------------------

### SM API Structures

Source: https://signalhound.com/sigdownloads/SDK/online_docs/sm_api/sm__api_8h_source.html

Data structures for GPIO steps and device diagnostics.

```c
typedef struct SmGPIOStep {
 double freq;
 uint8_t mask;
} SmGPIOStep;
```

```c
typedef struct SmDeviceDiagnostics {
 float voltage;
 float currentInput;
 float currentOCXO;
 float current58;
 float tempFPGAInternal;
 float tempFPGANear;
 float tempOCXO;
 float tempVCO;
 float tempRFBoardLO;
 float tempPowerSupply;
} SmDeviceDiagnostics;
```

--------------------------------

### Device Management Functions

Source: https://signalhound.com/sigdownloads/SDK/online_docs/sm_api/sm__api_8h_source.html

Functions for discovering, opening, and closing SM devices.

```c
SM_API SmStatus smGetDeviceList(int *serials, int *deviceCount);
```

```c
SM_API SmStatus smGetDeviceList2(int *serials, SmDeviceType *deviceTypes, int *deviceCount);
```

```c
SM_API SmStatus smOpenDevice(int *device);
```

```c
SM_API SmStatus smOpenDeviceBySerial(int *device, int serialNumber);
```

```c
SM_API SmStatus smOpenNetworkedDevice(int *device,
 const char *hostAddr,
 const char *deviceAddr,
 uint16_t port);
```

```c
SM_API SmStatus smCloseDevice(int device);
```

--------------------------------

### smGetIQParameters

Source: https://signalhound.com/sigdownloads/SDK/online_docs/sm_api/iq_streaming.html

Queries the current I/Q stream characteristics.

```APIDOC
## smGetIQParameters

### Description
Returns the actual sample rate and bandwidth currently configured for the I/Q stream.

### Signature
`SmStatus smGetIQParameters(int device, double *sampleRate, double *bandwidth)`
```

--------------------------------

### Device Configuration

Source: https://signalhound.com/sigdownloads/SDK/online_docs/sm_api/sm__api_8h_source.html

Functions for setting device parameters such as attenuation, reference levels, and preselector state.

```APIDOC
## smSetAttenuator
### Description
Sets the hardware attenuator value.
### Parameters
- **device** (int) - Device handle
- **atten** (int) - Attenuation value in dB

## smSetRefLevel
### Description
Sets the reference level for the device.
### Parameters
- **device** (int) - Device handle
- **refLevel** (double) - Reference level in dBm
```

--------------------------------

### Hardware Configuration Functions

Source: https://signalhound.com/sigdownloads/SDK/online_docs/sm_api/sm__api_8h_source.html

Functions for controlling power states, attenuators, reference levels, and GPIO settings.

```c
SM_API SmStatus smSetPowerState(int device, SmPowerState powerState);
SM_API SmStatus smGetPowerState(int device, SmPowerState *powerState);
SM_API SmStatus smSetAttenuator(int device, int atten);
SM_API SmStatus smGetAttenuator(int device, int *atten);
SM_API SmStatus smSetRefLevel(int device, double refLevel);
SM_API SmStatus smGetRefLevel(int device, double *refLevel);
SM_API SmStatus smSetPreselector(int device, SmBool enabled);
SM_API SmStatus smGetPreselector(int device, SmBool *enabled);
SM_API SmStatus smSetGPIOState(int device, SmGPIOState lowerState, SmGPIOState upperState);
SM_API SmStatus smGetGPIOState(int device, SmGPIOState *lowerState, SmGPIOState *upperState);
SM_API SmStatus smWriteGPIOImm(int device, uint8_t data);
SM_API SmStatus smReadGPIOImm(int device, uint8_t *data);
SM_API SmStatus smWriteSPI(int device, uint32_t data, int byteCount);
SM_API SmStatus smSetGPIOSweepDisabled(int device);
SM_API SmStatus smSetGPIOSweep(int device, SmGPIOStep *steps, int stepCount);
SM_API SmStatus smSetGPIOSwitchingDisabled(int device);
SM_API SmStatus smSetGPIOSwitching(int device, uint8_t *gpio, uint32_t *counts, int gpioSteps);
SM_API SmStatus smSetExternalReference(int device, SmBool enabled);
SM_API SmStatus smGetExternalReference(int device, SmBool *enabled);
SM_API SmStatus smSetReference(int device, SmReference reference);
SM_API SmStatus smGetReference(int device, SmReference *reference);
```

--------------------------------

### smOpenDeviceBySerial

Source: https://signalhound.com/sigdownloads/SDK/online_docs/sm_api/sm__api_8h_source.html

Opens a connection to a specific Signal Hound device using its serial number.

```APIDOC
## smOpenDeviceBySerial

### Description
Initializes a connection to a device identified by its serial number.

### Signature
`SmStatus smOpenDeviceBySerial(int *device, int serialNumber)`
```

--------------------------------

### Audio Configuration Functions

Source: https://signalhound.com/sigdownloads/SDK/online_docs/sm_api/sm__api_8h_source.html

Functions for configuring audio demodulation parameters.

```c
SM_API SmStatus smSetAudioCenterFreq(int device, double centerFreqHz);
```

```c
SM_API SmStatus smSetAudioType(int device, SmAudioType audioType);
```

```c
SM_API SmStatus smSetAudioFilters(int device,
 double ifBandwidth,
 double audioLpf,
 double audioHpf);
```

```c
SM_API SmStatus smSetAudioFMDeemphasis(int device, double deemphasis);
```

--------------------------------

### smStartSweep

Source: https://signalhound.com/sigdownloads/SDK/online_docs/sm_api/sm__api_8h_source.html

Initiates a sweep operation on the specified device.

```APIDOC
## smStartSweep

### Description
Starts a sweep at the specified position.

### Signature
`SmStatus smStartSweep(int device, int pos)`
```

--------------------------------

### Network Configuration Functions

Source: https://signalhound.com/sigdownloads/SDK/online_docs/sm_api/sm__api_8h_source.html

Functions for managing network-connected devices.

```c
SM_API SmStatus smBroadcastNetworkConfig(const char *hostAddr,
 const char *deviceAddr,
 uint16_t port,
 SmBool nonVolatile);
```

```c
SM_API SmStatus smNetworkConfigGetDeviceList(int *serials, int *deviceCount);
```

```c
SM_API SmStatus smNetworkConfigOpenDevice(int *device, int serialNumber);
```

```c
SM_API SmStatus smNetworkConfigCloseDevice(int device);
```

```c
SM_API SmStatus smNetworkConfigGetMAC(int device, char *mac);
```

```c
SM_API SmStatus smNetworkConfigSetIP(int device, const char *addr, SmBool nonVolatile);
```

```c
SM_API SmStatus smNetworkConfigGetIP(int device, char *addr);
```

```c
SM_API SmStatus smNetworkConfigSetPort(int device, int port, SmBool nonVolatile);
```

```c
SM_API SmStatus smNetworkConfigGetPort(int device, int *port);
```

--------------------------------

### smNetworkConfigOpenDevice

Source: https://signalhound.com/sigdownloads/SDK/online_docs/sm_api/sm__api_8h_source.html

Opens a network-connected device by serial number.

```APIDOC
## smNetworkConfigOpenDevice

### Description
Attempts to open a connection to a network device using its serial number.

### Signature
SmStatus smNetworkConfigOpenDevice(int *device, int serialNumber);
```

--------------------------------

### smGetGPIOState

Source: https://signalhound.com/sigdownloads/SDK/online_docs/sm_api/sm__api_8h_source.html

Retrieves the current state of the GPIO.

```APIDOC
## smGetGPIOState

### Signature
`SmStatus smGetGPIOState(int device, SmGPIOState *lowerState, SmGPIOState *upperState)`
```

--------------------------------

### smOpenNetworkedDevice

Source: https://signalhound.com/sigdownloads/SDK/online_docs/sm_api/sm__api_8h_source.html

Opens a connection to a networked Signal Hound device.

```APIDOC
## smOpenNetworkedDevice

### Description
Establishes a connection to a networked device using the provided host and device addresses.

### Signature
SmStatus smOpenNetworkedDevice(int *device, const char *hostAddr, const char *deviceAddr, uint16_t port)
```

--------------------------------

### IQ Sweep List Configuration Functions

Source: https://signalhound.com/sigdownloads/SDK/online_docs/sm_api/sm__api_8h_source.html

Functions for configuring IQ sweep list parameters.

```c
SM_API SmStatus smSetIQSweepListDataType(int device, SmDataType dataType);
```

```c
SM_API SmStatus smSetIQSweepListCorrected(int device, SmBool corrected);
```

```c
SM_API SmStatus smSetIQSweepListSteps(int device, int steps);
```

```c
SM_API SmStatus smGetIQSweepListSteps(int device, int *steps);
```

```c
SM_API SmStatus smSetIQSweepListFreq(int device, int step, double freq);
```

```c
SM_API SmStatus smSetIQSweepListRef(int device, int step, double level);
```

```c
SM_API SmStatus smSetIQSweepListAtten(int device, int step, int atten);
```

```c
SM_API SmStatus smSetIQSweepListSampleCount(int device, int step, uint32_t samples);
```

--------------------------------

### IQ Full Band Configuration and Acquisition

Source: https://signalhound.com/sigdownloads/SDK/online_docs/sm_api/sm__api_8h_source.html

Functions for configuring and acquiring full-band IQ data.

```c
SM_API SmStatus smSetIQFullBandAtten(int device, int atten);
```

```c
SM_API SmStatus smSetIQFullBandCorrected(int device, SmBool corrected);
```

```c
SM_API SmStatus smSetIQFullBandSamples(int device, int samples);
```

```c
SM_API SmStatus smSetIQFullBandTriggerType(int device, SmTriggerType triggerType);
```

```c
SM_API SmStatus smSetIQFullBandVideoTrigger(int device, double triggerLevel);
```

```c
SM_API SmStatus smSetIQFullBandTriggerTimeout(int device, double triggerTimeout);
```

```c
SM_API SmStatus smGetIQFullBand(int device, float *iq, int freq);
```

```c
SM_API SmStatus smGetIQFullBandSweep(int device, float *iq, int startIndex, int stepSize, int steps);
```

--------------------------------

### Device Management Functions

Source: https://signalhound.com/sigdownloads/SDK/online_docs/sm_api/sm__api_8h_source.html

Functions for discovering, opening, and closing SM series devices.

```APIDOC
## smGetDeviceList
### Description
Retrieves a list of connected device serial numbers.
### Parameters
- **serials** (int*) - Output array for serial numbers
- **deviceCount** (int*) - Output for number of devices found

## smOpenDevice
### Description
Opens a connection to a specific device.
### Parameters
- **device** (int*) - Output handle for the opened device
```

--------------------------------

### smGetDeviceInfo

Source: https://signalhound.com/sigdownloads/SDK/online_docs/sm_api/sm__api_8h_source.html

Retrieves information about the connected device.

```APIDOC
## smGetDeviceInfo

### Description
Retrieves the device type and serial number for a given device handle.

### Signature
`SmStatus smGetDeviceInfo(int device, SmDeviceType *deviceType, int *serialNumber)`
```

--------------------------------

### smSetIQBandwidth

Source: https://signalhound.com/sigdownloads/SDK/online_docs/sm_api/iq_streaming.html

Configures the I/Q bandwidth.

```APIDOC
## smSetIQBandwidth

### Description
Sets the bandwidth for I/Q acquisition and enables/disables the software filter.

### Signature
`SmStatus smSetIQBandwidth(int device, SmBool enableSoftwareFilter, double bandwidth)`
```

--------------------------------

### Segmented IQ Configuration Functions

Source: https://signalhound.com/sigdownloads/SDK/online_docs/sm_api/sm__api_8h_source.html

Functions for configuring segmented IQ capture parameters.

```c
SM_API SmStatus smSetSegIQDataType(int device, SmDataType dataType);
```

```c
SM_API SmStatus smSetSegIQCenterFreq(int device, double centerFreqHz);
```

```c
SM_API SmStatus smSetSegIQVideoTrigger(int device, double triggerLevel, SmTriggerEdge triggerEdge);
```

```c
SM_API SmStatus smSetSegIQExtTrigger(int device, SmTriggerEdge extTriggerEdge);
```

```c
SM_API SmStatus smSetSegIQFMTParams(int device,
 int fftSize,
 const double *frequencies,
 const double *ampls,
 int count);
```

```c
SM_API SmStatus smSetSegIQSegmentCount(int device, int segmentCount);
```

```c
SM_API SmStatus smSetSegIQSegment(int device,
 int segment,
 SmTriggerType triggerType,
 int preTrigger,
 int captureSize,
 double timeoutSeconds);
```

--------------------------------

### smSetGPIOSwitching

Source: https://signalhound.com/sigdownloads/SDK/online_docs/sm_api/sm__api_8h_source.html

Configures GPIO switching parameters.

```APIDOC
## smSetGPIOSwitching

### Signature
`SmStatus smSetGPIOSwitching(int device, uint8_t *gpio, uint32_t *counts, int gpioSteps)`
```

--------------------------------

### smGetRefLevel

Source: https://signalhound.com/sigdownloads/SDK/online_docs/sm_api/sm__api_8h_source.html

Retrieves the current reference level.

```APIDOC
## smGetRefLevel

### Signature
`SmStatus smGetRefLevel(int device, double *refLevel)`
```

--------------------------------

### smSegIQCaptureFull

Source: https://signalhound.com/sigdownloads/SDK/online_docs/sm_api/iq_segmented.html

Performs a full segmented I/Q capture operation.

```APIDOC
## smSegIQCaptureFull

### Description
Performs a full segmented I/Q capture. This is a convenience function that handles the capture sequence for a specific segment.

### Signature
SmStatus smSegIQCaptureFull(int device, int capture, void *iq, int offset, int len, int64_t *nsSinceEpoch, SmBool *timedOut)

### Parameters
- **device** (int) - The device handle.
- **capture** (int) - The capture index.
- **iq** (void*) - Pointer to the buffer to store I/Q data.
- **offset** (int) - Offset in the buffer.
- **len** (int) - Number of samples to capture.
- **nsSinceEpoch** (int64_t*) - Pointer to store the timestamp of the capture.
- **timedOut** (SmBool*) - Pointer to store the timeout status.
```

--------------------------------

### smGetAPIVersion

Source: https://signalhound.com/sigdownloads/SDK/online_docs/sm_api/sm__api_8h_source.html

Retrieves the current API version string.

```APIDOC
## smGetAPIVersion

### Description
Returns a string representing the current version of the SM API.

### Signature
const char* smGetAPIVersion();
```

--------------------------------

### Deprecated API Functions and Macros

Source: https://signalhound.com/sigdownloads/SDK/online_docs/sm_api/sm__api_8h_source.html

Legacy functions and macros that are deprecated.

```c
SM_DEPRECATED("smSetIQUSBQueueSize has been deprecated, use smSetIQQueueSize")
SM_API SmStatus smSetIQUSBQueueSize(int device, float ms);
```

```c
#define SM200A_AUTO_ATTEN (SM_AUTO_ATTEN)
#define SM200A_MAX_ATTEN (SM_MAX_ATTEN)
#define SM200A_MAX_REF_LEVEL (SM_MAX_REF_LEVEL)
#define SM200A_MAX_SWEEP_QUEUE_SZ (SM_MAX_SWEEP_QUEUE_SZ)
#define SM200A_MIN_FREQ (SM200_MIN_FREQ)
#define SM200A_MAX_FREQ (SM200_MAX_FREQ)
#define SM200A_MAX_IQ_DECIMATION (SM_MAX_IQ_DECIMATION)
#define SM200A_PRESELECTOR_MAX_FREQ (SM_PRESELECTOR_MAX_FREQ)
#define SM200A_FAST_SWEEP_MIN_RBW (SM_FAST_SWEEP_MIN_RBW)
#define SM200A_RTSA_MIN_SPAN (SM_REAL_TIME_MIN_SPAN)
```

--------------------------------

### smGetSweep

Source: https://signalhound.com/sigdownloads/SDK/online_docs/sm_api/sweep_mode.html

Retrieves the sweep data from the device.

```APIDOC
## smGetSweep

### Description
Acquires a single sweep from the device.

### Signature
`SmStatus smGetSweep(int device, float *sweepMin, float *sweepMax, int64_t *nsSinceEpoch)`
```

--------------------------------

### Diagnostics

Source: https://signalhound.com/sigdownloads/SDK/online_docs/sm_api/sm__api_8h_source.html

Functions for retrieving device health, temperature, and power information.

```APIDOC
## smGetDeviceDiagnostics
### Description
Retrieves basic diagnostic information including voltage, current, and temperature.
### Parameters
- **device** (int) - Device handle
- **voltage** (float*) - Output voltage
- **current** (float*) - Output current
- **temperature** (float*) - Output temperature

## smGetFullDeviceDiagnostics
### Description
Retrieves comprehensive diagnostic data structure.
### Parameters
- **device** (int) - Device handle
- **diagnostics** (SmDeviceDiagnostics*) - Output structure containing detailed diagnostic metrics
```

--------------------------------

### Calculate Sample Power from 32-bit Complex Floats

Source: https://signalhound.com/sigdownloads/SDK/online_docs/sm_api/index.html

Calculate the power in dBm for a single I/Q sample represented as 32-bit complex floats.

```C
Sample Power (dBm) = 10.0 * log10(re*re + im*im);
```

--------------------------------

### smGetRealTimeParameters

Source: https://signalhound.com/sigdownloads/SDK/online_docs/sm_api/real_time.html

Retrieves the current real-time measurement parameters.

```APIDOC
## smGetRealTimeParameters

### Description
Returns the actual parameters currently in use by the receiver for real-time mode.

### Signature
`SmStatus smGetRealTimeParameters(int device, double *actualRBW, int *sweepSize, double *actualStartFreq, double *binSize, int *frameWidth, int *frameHeight, double *poi)`

### Parameters
- **device** (int) - The device handle.
- **actualRBW** (double*) - Pointer to store the actual RBW.
- **sweepSize** (int*) - Pointer to store the sweep size.
- **actualStartFreq** (double*) - Pointer to store the actual start frequency.
- **binSize** (double*) - Pointer to store the bin size.
- **frameWidth** (int*) - Pointer to store the frame width.
- **frameHeight** (int*) - Pointer to store the frame height.
- **poi** (double*) - Pointer to store the probability of intercept.
```

--------------------------------

### smGetIQ

Source: https://signalhound.com/sigdownloads/SDK/online_docs/sm_api/sm__api_8h_source.html

Retrieves IQ data from the device.

```APIDOC
## smGetIQ

### Description
Retrieves IQ data, trigger information, and status from the device.

### Signature
SmStatus smGetIQ(int device, void *iqBuf, int iqBufSize, double *triggers, int triggerBufSize, int64_t *nsSinceEpoch, SmBool purge, int *sampleLoss, int *samplesRemaining);
```

--------------------------------

### smGetDeviceList2

Source: https://signalhound.com/sigdownloads/SDK/online_docs/sm_api/sm__api_8h_source.html

Retrieves a list of connected devices, their serial numbers, and types.

```APIDOC
## smGetDeviceList2

### Description
Retrieves a list of connected devices, their serial numbers, and types.

### Signature
`SmStatus smGetDeviceList2(int *serials, SmDeviceType *deviceTypes, int *deviceCount)`
```

--------------------------------

### smSetRealTimeWindow

Source: https://signalhound.com/sigdownloads/SDK/online_docs/sm_api/real_time.html

Sets the windowing function for real-time measurements.

```APIDOC
## smSetRealTimeWindow

### Description
Sets the window function used for real-time FFT processing.

### Signature
`SmStatus smSetRealTimeWindow(int device, SmWindowType window)`

### Parameters
- **device** (int) - The device handle.
- **window** (SmWindowType) - The window type (e.g., smWindowNutall).
```

--------------------------------

### smGetSFPDiagnostics

Source: https://signalhound.com/sigdownloads/SDK/online_docs/sm_api/sm__api_8h_source.html

Retrieves SFP diagnostic data including temperature, voltage, and power levels.

```APIDOC
## smGetSFPDiagnostics

### Signature
`SmStatus smGetSFPDiagnostics(int device, float *temp, float *voltage, float *txPower, float *rxPower)`
```

--------------------------------

### smGetAPIVersion

Source: https://signalhound.com/sigdownloads/SDK/online_docs/sm_api/sm__api_8h_source.html

Retrieves the current version of the API.

```APIDOC
## smGetAPIVersion

### Description
Returns a string representing the current API version.

### Signature
`const char * smGetAPIVersion()`
```

--------------------------------

### Audio and GPS Functions

Source: https://signalhound.com/sigdownloads/SDK/online_docs/sm_api/sm__api_8h_source.html

Functions for audio retrieval and GPS device management.

```c
SM_API SmStatus smGetAudio(int device, float *audio);
```

```c
SM_API SmStatus smGetGPSInfo(int device,
 SmBool refresh,
 SmBool *updated,
 int64_t *secSinceEpoch,
 double *latitude,
 double *longitude,
 double *altitude,
 char *nmea,
 int *nmeaLen);
```

```c
SM_API SmStatus smWriteToGPS(int device, const uint8_t *mem, int len);
```

```c
SM_API SmStatus smSetGPSPlatformModel(int device, SmGPSPlatformModel platformModel);
```

--------------------------------

### Device Information and Diagnostics

Source: https://signalhound.com/sigdownloads/SDK/online_docs/sm_api/sm__api_8h_source.html

Functions to retrieve device metadata, firmware versions, and diagnostic data.

```c
SM_API SmStatus smPreset(int device);
SM_API SmStatus smPresetSerial(int serialNumber);
SM_API SmStatus smNetworkedSpeedTest(int device, double durationSeconds, double *bytesPerSecond);
SM_API SmStatus smGetDeviceInfo(int device, SmDeviceType *deviceType, int *serialNumber);
SM_API SmStatus smGetFirmwareVersion(int device, int *major, int *minor, int *revision);
SM_API SmStatus smHasIFOutput(int device, SmBool *present);
SM_API SmStatus smGetDeviceDiagnostics(int device, float *voltage, float *current, float *temperature);
SM_API SmStatus smGetFullDeviceDiagnostics(int device, SmDeviceDiagnostics *diagnostics);
SM_API SmStatus smGetSFPDiagnostics(int device,
 float *temp,
 float *voltage,
 float *txPower,
 float *rxPower);
```

--------------------------------

### smFinishSweep

Source: https://signalhound.com/sigdownloads/SDK/online_docs/sm_api/sm__api_8h_source.html

Completes a sweep operation and retrieves the resulting data.

```APIDOC
## smFinishSweep

### Description
Finalizes the sweep and returns the minimum and maximum values along with the timestamp.

### Signature
`SmStatus smFinishSweep(int device, int pos, float *sweepMin, float *sweepMax, int64_t *nsSinceEpoch)`
```

--------------------------------

### Device Control and Status Functions

Source: https://signalhound.com/sigdownloads/SDK/online_docs/sm_api/sm__api_8h_source.html

General functions for device mode configuration, status, and data retrieval.

```c
SM_API SmStatus smConfigure(int device, SmMode mode);
```

```c
SM_API SmStatus smGetCurrentMode(int device, SmMode *mode);
```

```c
SM_API SmStatus smAbort(int device);
```

```c
SM_API SmStatus smGetSweepParameters(int device,
 double *actualRBW,
 double *actualVBW,
 double *actualStartFreq,
 double *binSize,
 int *sweepSize);
```

```c
SM_API SmStatus smGetRealTimeParameters(int device,
 double *actualRBW,
 int *sweepSize,
 double *actualStartFreq,
 double *binSize,
 int *frameWidth,
 int *frameHeight,
 double *poi);
```

```c
SM_API SmStatus smGetIQParameters(int device, double *sampleRate, double *bandwidth);
```

```c
SM_API SmStatus smGetIQCorrection(int device, float *scale);
```

```c
SM_API SmStatus smIQSweepListGetCorrections(int device, float *corrections);
```

```c
SM_API SmStatus smSegIQGetMaxCaptures(int device, int *maxCaptures);
```

```c
SM_API SmStatus smGetSweep(int device, float *sweepMin, float *sweepMax, int64_t *nsSinceEpoch);
```

--------------------------------

### Device Maintenance and Utility Functions

Source: https://signalhound.com/sigdownloads/SDK/online_docs/sm_api/sm__api_8h_source.html

Functions for fan control, calibration dates, and general device information.

```c
SM_API SmStatus smSetFanThreshold(int device, int temp);
```

```c
SM_API SmStatus smGetFanThreshold(int device, int *temp);
```

```c
SM_API SmStatus smSetIFOutput(int device, double frequency);
```

```c
SM_API SmStatus smGetCalDate(int device, uint64_t *lastCalDate);
```

```c
SM_API const char* smGetAPIVersion();
```

```c
SM_API const char* smGetErrorString(SmStatus status);
```

--------------------------------

### Convert 16-bit Complex Shorts to Corrected I/Q

Source: https://signalhound.com/sigdownloads/SDK/online_docs/sm_api/index.html

Convert 16-bit complex short data to corrected float values for power measurement.

```C
float re32f = ((float)re16s / 32768.0);
float im32f = ((float)im16s / 32768.0);
re32f *= correction;
im32f *= correction;
Sample Power (dBm) = 10.0 * log10(re32f*re32f + im32f*im32f);
```

--------------------------------

### smGetDeviceDiagnostics

Source: https://signalhound.com/sigdownloads/SDK/online_docs/sm_api/sm__api_8h_source.html

Retrieves diagnostic information including voltage, current, and temperature for the specified device.

```APIDOC
## smGetDeviceDiagnostics

### Description
Retrieves the current diagnostic metrics for a connected device.

### Signature
`SmStatus smGetDeviceDiagnostics(int device, float *voltage, float *current, float *temperature)`
```

--------------------------------

### Sweep Configuration Functions

Source: https://signalhound.com/sigdownloads/SDK/online_docs/sm_api/sm__api_8h_source.html

Functions for configuring sweep parameters such as speed, frequency range, coupling, and detectors.

```c
SM_API SmStatus smSetSweepSpeed(int device, SmSweepSpeed sweepSpeed);
```

```c
SM_API SmStatus smSetSweepCenterSpan(int device, double centerFreqHz, double spanHz);
```

```c
SM_API SmStatus smSetSweepStartStop(int device, double startFreqHz, double stopFreqHz);
```

```c
SM_API SmStatus smSetSweepCoupling(int device, double rbw, double vbw, double sweepTime);
```

```c
SM_API SmStatus smSetSweepDetector(int device, SmDetector detector, SmVideoUnits videoUnits);
```

```c
SM_API SmStatus smSetSweepScale(int device, SmScale scale);
```

```c
SM_API SmStatus smSetSweepWindow(int device, SmWindowType window);
```

```c
SM_API SmStatus smSetSweepSpurReject(int device, SmBool spurRejectEnabled);
```

--------------------------------

### smCloseDevice

Source: https://signalhound.com/sigdownloads/SDK/online_docs/sm_api/iq_streaming.html

Closes the connection to the device.

```APIDOC
## smCloseDevice

### Description
Closes the connection to the specified device.

### Signature
`SmStatus smCloseDevice(int device)`
```

--------------------------------

### smGetVrtPacketSize

Source: https://signalhound.com/sigdownloads/SDK/online_docs/sm_api/sm__api__vrt_8h_source.html

Retrieves the current VRT packet size configuration.

```APIDOC
## smGetVrtPacketSize

### Description
Retrieves the current VRT packet size configuration.

### Signature
SmStatus smGetVrtPacketSize(int device, uint16_t *samplesPerPkt, uint32_t *wordCount)

### Parameters
- **device** (int) - The device handle.
- **samplesPerPkt** (uint16_t*) - Pointer to store the samples per packet.
- **wordCount** (uint32_t*) - Pointer to store the word count.
```

--------------------------------

### smGetRealTimeFrame

Source: https://signalhound.com/sigdownloads/SDK/online_docs/sm_api/real_time.html

Retrieves the latest real-time frame and sweep data from the device.

```APIDOC
## smGetRealTimeFrame

### Description
Retrieves the current color frame and sweep data from the device buffer.

### Signature
`SmStatus smGetRealTimeFrame(int device, float *colorFrame, float *alphaFrame, float *sweepMin, float *sweepMax, int *frameCount, int64_t *nsSinceEpoch)`

### Parameters
- **device** (int) - The device handle.
- **colorFrame** (float*) - Pointer to buffer for color frame data.
- **alphaFrame** (float*) - Pointer to buffer for alpha frame data.
- **sweepMin** (float*) - Pointer to buffer for minimum sweep data.
- **sweepMax** (float*) - Pointer to buffer for maximum sweep data.
- **frameCount** (int*) - Pointer to store the frame count.
- **nsSinceEpoch** (int64_t*) - Pointer to store the timestamp in nanoseconds.
```

--------------------------------

### smGetGPSState

Source: https://signalhound.com/sigdownloads/SDK/online_docs/sm_api/sm__api_8h_source.html

Retrieves the current state of the GPS module.

```APIDOC
## smGetGPSState

### Signature
`SmStatus smGetGPSState(int device, SmGPSState *GPSState)`
```

--------------------------------

### smSetIQSweepListRef

Source: https://signalhound.com/sigdownloads/SDK/online_docs/sm_api/iq_sweep_list.html

Sets the reference level for a specific frequency step.

```APIDOC
## smSetIQSweepListRef

### Description
Sets the reference level (in dBm) for a specific frequency step in the sweep list.

### Signature
`SmStatus smSetIQSweepListRef(int device, int step, double level)`

### Parameters
- **device** (int) - The device handle.
- **step** (int) - The index of the frequency step.
- **level** (double) - The reference level in dBm.
```

--------------------------------

### smSetIQSweepListRef

Source: https://signalhound.com/sigdownloads/SDK/online_docs/sm_api/sm__api_8h_source.html

Sets the reference level for a specific step in the IQ sweep list.

```APIDOC
## smSetIQSweepListRef

### Description
Sets the reference level for a specific step in the IQ sweep list.

### Signature
`SmStatus smSetIQSweepListRef(int device, int step, double level)`
```

--------------------------------

### smGetFanThreshold

Source: https://signalhound.com/sigdownloads/SDK/online_docs/sm_api/sm__api_8h_source.html

Retrieves the current fan temperature threshold.

```APIDOC
## smGetFanThreshold

### Signature
`SmStatus smGetFanThreshold(int device, int *temp)`
```

--------------------------------

### smGetVrtContextPkt

Source: https://signalhound.com/sigdownloads/SDK/online_docs/sm_api/sm__api__vrt_8h.html

Retrieves one VRT context packet.

```APIDOC
## smGetVrtContextPkt

### Description
Retrieve one VRT context packet.

### Parameters
- **device** (int) - Required - Device handle.
- **words** (uint32_t *) - Required - User allocated buffer.
- **wordCount** (uint32_t *) - Required - Number of words written to the words buffer.
```

--------------------------------

### Real-Time and IQ Data Acquisition

Source: https://signalhound.com/sigdownloads/SDK/online_docs/sm_api/sm__api_8h_source.html

Functions for retrieving real-time frames and IQ data from the device.

```c
SM_API SmStatus smGetRealTimeFrame(int device,
 float *colorFrame,
 float *alphaFrame,
 float *sweepMin,
 float *sweepMax,
 int *frameCount,
 int64_t *nsSinceEpoch);
```

```c
SM_API SmStatus smGetIQ(int device,
 void *iqBuf,
 int iqBufSize,
 double *triggers,
 int triggerBufSize,
 int64_t *nsSinceEpoch,
 SmBool purge,
 int *sampleLoss,
 int *samplesRemaining);
```

--------------------------------

### smSetIQDataType

Source: https://signalhound.com/sigdownloads/SDK/online_docs/sm_api/iq_streaming.html

Sets the data type for I/Q samples.

```APIDOC
## smSetIQDataType

### Description
Configures the data type for the I/Q stream.

### Signature
`SmStatus smSetIQDataType(int device, SmDataType dataType)`
```

--------------------------------

### smSetSweepSpurReject

Source: https://signalhound.com/sigdownloads/SDK/online_docs/sm_api/sweep_mode.html

Enables or disables software spur rejection.

```APIDOC
## smSetSweepSpurReject

### Description
Configures whether software spur rejection is enabled.

### Signature
`SmStatus smSetSweepSpurReject(int device, SmBool spurRejectEnabled)`
```

--------------------------------

### smSetSweepWindow

Source: https://signalhound.com/sigdownloads/SDK/online_docs/sm_api/sweep_mode.html

Sets the window function for the sweep.

```APIDOC
## smSetSweepWindow

### Description
Sets the windowing function used during sweep processing.

### Signature
`SmStatus smSetSweepWindow(int device, SmWindowType window)`
```