CP2102 datasheet(4/36 Pages) SILABS

4 / 36 page

AN169

Rev. 2.3

3.1. SI_GetNumDevices

Description:

This function returns the number of devices connected to the host.

Supported Devices:

C8051F320/1/6/7, C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D,

C8051F380/1/2/3/4/5/6/7, C8051T320/1/2/3/6/7, C8051T620/1/2/3, CP2101/2/3/4/5/8/9/

Prototype:

SI_STATUS SI_GetNumDevices (LPDWORD NumDevices)

Parameters:

1. NumDevices—Address of a DWORD variable that will contain the number of devices

connected on return.

Return Value:

SI_STATUS

= SI_SUCCESS or

SI_DEVICE_NOT_FOUND or

SI_INVALID_PARAMETER

3.2.

SI_GetProductString

Description:

This function returns a null terminated serial number (S/N) string or product description string for

the device specified by an index passed in DeviceNum. The index for the first device is 0 and the

last device is the value returned by SI_GetNumDevices – 1.

Supported Devices:

C8051F320/1/6/7, C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D,

C8051F380/1/2/3/4/5/6/7, C8051T320/1/2/3/6/7, C8051T620/1/2/3, CP2101/2/3/4/5/8/9

Prototype:

SI_STATUS SI_GetProductString (DWORD DeviceNum, LPVOID DeviceString,

DWORD Options)

Parameters:

1. DeviceNum—Index of the device for which the product description string or serial number

string is desired.

2. DeviceString—Variable of type SI_DEVICE_STRING which will contain a NULL terminated

device descriptor or serial number string on return.

3. Options—DWORD containing flags to determine if DeviceString contains a serial number,

product description, Vendor ID, or Product ID string. See "Appendix D—Definitions from C++

header file SiUSBXp.h” for flags.

Return Value:

SI_STATUS

= SI_SUCCESS or

SI_DEVICE_NOT_FOUND or

SI_INVALID_PARAMETER

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