Featured product - USB-I2C/SPI/GPIO Adapter U2C-12
USB-I/O Interface Adapter GPIO-24. Programmer's Reference Manual.
2.1.3. GPIO_GetDeviceCount()
GPIO_RESULT GPIO_OpenDevice( int nDevice, HGPIO* phDevice );
The GPIO_OpenDevice() function opens the GPIO-24 adapter, specified by its number, and returns its handle.
Parameters:
- nDevice
The number of the device to be opened.
- phDevice
Pointer to a variable to be filled with the device handle.
Return values:
- GPIO_S_SUCCESS
The device was successfully opened and *phDevice contains correct handle.
- GPIO_S_ALREADY_OPENED
The device has been already opened; *phDevice contains the same handle as was returned previously.
- GPIO_E_INVALIDARG
Invalid argument has been provided (nDevice must be in the range from 0 to number of devices - 1).
- GPIO_E_FAIL
Failed to open device.
- GPIO_E_NOT_INITIALIZED
Library has not been initialized.
