Description

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Functions to control the device list: open and close devices and retrieve device information.

LibTiePie maintains a Device list, containing all available supported devices. Possible devices are oscilloscopes, generators and I2C hosts. Instruments can contain multiple devices, e.g. the Handyscope HS5 contains an oscilloscope, a generator and an I2C host.

After starting the application, the device list must be filled with all available devices, using LstUpdate(). When the application is running, the device list is automatically maintained. When new compatible devices are connected to the computer, they will be added to the device list automatically. When devices are disconnected from the computer, they are automatically removed from the list.

Getting device information

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Before opening a device, information from the listed devices can be retrieved. This information can help opening the required device, when multiple devices are available in the list.

Opening a device

Before any device action can be performed a device needs to be opened. When a device in the device list is opened, a unique handle to the device is assigned. This handle is required to access the device.

LibTiePie has four functions for opening devices. One function for each device type (LstOpenOscilloscope, LstOpenGenerator and LstOpenI2CHost), and one (LstOpenDevice) to open a device by specifying its device type. A device can only be opened once.

Device open methods

LibTiePie supports three different methods for opening devices.

• Open by device list index (IDKIND_INDEX), e.g.:
  TpDeviceHandle_t hScp = LstOpenDevice( IDKIND_INDEX , 4 , DEVICETYPE_OSCILLOSCOPE ); // Try to open oscilloscope at device list index 4.
• Open by serial number (IDKIND_SERIALNUMBER), e.g.:
  TpDeviceHandle_t hGen = LstOpenDevice( IDKIND_SERIALNUMBER , 22110 , DEVICETYPE_GENERATOR ); // Try to open generator with serial number 22110.
• Open by product id (IDKIND_PRODUCTID), e.g.:
  TpDeviceHandle_t hI2C = LstOpenDevice( IDKIND_PRODUCTID , PID_HS5 , DEVICETYPE_I2CHOST ); // Try to open a Handyscope HS5 I2C host.

When a device cannot be opened the function to open returns TPDEVICEHANDLE_INVALID.

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Closing a disconnected device

When an open device is disconnected from the computer, the handle to that device will be no longer valid and the device needs to be closed using DevClose(). Calling functions pointing to a disconnected device will set the status flag to LIBTIEPIESTATUS_DEVICE_GONE.

Combining devices

Several devices support combining, where multiple units can be combined to form a larger device. Two different methods are possible.

Automatic combining

This applies to the Handyscope HS5.

Connect the instruments to each other using a special coupling cable and update the device list using LstUpdate(). A new combined device with a new (virtual) serial number will be added to the device list, the original devices remain present in the device list but can not be accessed anymore.

To undo an automatic combination, remove the coupling cable(s) and update the device list using LstUpdate().

Manual combining

This applies to the Handyscope HS4, Handyscope HS4 DIFF and ATS5004D.

Connect the instruments to each other using a special coupling cable and open the individual oscilloscopes to retrieve their handles. Then call a coupling function, supplying the handles of the devices to combine. A new combined device with a new (virtual) serial number will be added to the device list, the original devices remain present in the device list but their handles become invalid. These should be closed using DevClose(). An example in C is available on the TiePie engineering website.

To undo a manual combination, remove the coupling cable, close the combined device using DevClose() with the handle of the combined device. Finally remove the combined device from the device list using LstRemoveDevice() with the serial number of the combined device.

Opening a combined device

Opening a combined device can be done in the ways described before, with one restriction. When opening a combined device by product id (IDKIND_PRODUCTID), the id PID_COMBI must be used.

Function Documentation

Update the device list.

This function searches for new instruments and adds these to the device list.

Example

Since

0.5

Get the number of devices in the device list.

Returns

The number of devices in the device list.

Since

0.4.0

Open a device and get a handle to the device.

Returns

A device handle, or TPDEVICEHANDLE_INVALID on error.

See also

LstOpenOscilloscope

LstOpenGenerator

LstOpenI2CHost

DevClose

Since

0.4.0

Open an oscilloscope and get a handle to the oscilloscope.

Returns

A device handle, or TPDEVICEHANDLE_INVALID on error.

See also

LstOpenDevice

LstOpenGenerator

LstOpenI2CHost

DevClose

Since

0.4.0

Open a generator and get a handle to the generator.

Returns

A device handle, or TPDEVICEHANDLE_INVALID on error.

See also

LstOpenDevice

LstOpenOscilloscope

LstOpenI2CHost

DevClose

Since

0.4.0

Open an I2C host and get a handle to the I2C host.

Returns

A device handle, or TPDEVICEHANDLE_INVALID on error.

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See also

LstOpenDevice

LstOpenOscilloscope

LstOpenGenerator

DevClose

Since

0.4.0

Create a combined instrument.

This function creates combined instrument from the indicated devices.

Returns

Serial number of the combined device, or zero on error.

See also

LstCreateAndOpenCombinedDevice

Since

0.4.4

Create and open a combined instrument.

This function creates a combined instrument from the indicated devices and opens it.

Returns

A device handle, or TPDEVICEHANDLE_INVALID on error.

See also

LstCreateCombinedDevice

Since

0.4.4

Remove an instrument from the device list so it can be used by other applications.

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Since

0.4.0