CP2103 datasheet(13/36 Pages) SILABS

13 / 36 page

AN169

Rev. 2.3

3.16. SI_GetModem Status

Description:

Gets the Modem Status from the device. This includes the modem pin states.

Supported Devices:

CP2101/2/3/4/5/8/9

Prototype:

SI_STATUS SI_GetModemStatus (HANDLE Handle, PBYTE ModemStatus)

Parameters:

1. Handle—Handle to the device as returned by SI_Open.

2. lpbModemStatus—Address of a BYTE variable that contains the current states of the RS-232

modem control lines. The byte is defined as follows:

Bit 0:

DTR State

Bit 1:

RTS State

Bit 4:

CTS State

Bit 5:

DSR State

Bit 6:

RI State

Bit 7:

DCD State

Return Value:

SI_STATUS

= SI_SUCCESS or

SI_DEVICE_IO_FAILED or

SI_INVALID_HANDLE or

SI_INVALID_PARAMETER

3.17. SI_SetBreak

Description:

Sends a break state (transmit or reset) to a CP210x device. Note that this function is not neces-

sarily synchronized with queued transmit data.

Supported Devices:

CP2101/2/3/4/5/8/9

Prototype:

SI_STATUS SI_SetBreak(HANDLE cyHandle, WORD wBreakState)

Parameters:

1. Handle—Handle to the device as returned by SI_Open.

2. wBreakState—The break state to set. If this value is a 0x0000 then the break is reset. If this

value is a 0x0001 then a break is transmitted.

Return Value:

SI_STATUS = SI_SUCCESS or

SI_DEVICE_IO_FAILED or

SI_INVALID_HANDLE or

SI_INVALID_PARAMETER

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