SERIAL_GetControlLines

This function reads the current state of the control lines, and writes a bitmap into the address pointed to by 'val'. Only the input bits (CTS, DSR, DCD, RI) reflect the current status of control lines.

Synopsis

int SERIAL_GetControlLines( int port, 
unsigned char *bitmap);
 

Parameters

Parameter	Description
port	Serial port number (0 based). Specify port 0 to redirect the output to the hsmtrace log.
bitmap	Pointer to a character, which will have the resulting bitmap

Return Code

0: The function succeeded

-1: The function failed. The value in the bitmap is not valid

Comments

#define MCL_DSR 0x01
#define MCL_DTR 0x02
#define MCL_RTS 0x04
#define MCL_CTS 0x08
#define MCL_DCD 0x10
#define MCL_RI  0x20
#define MCL_OP_SET 1
#define MCL_OP_CLEAR 2