Maxim-integrated 73M1866B/73M1966B Reference Driver Uživatelský manuál stáhnout pdf (Strana 36)

73M1866B/73M1966B Reference Driver User Guide UG_1x66B_015

36 Rev. 2.7

6.1.18 M1966_PERF_RX_OFFSET_CALIB

This IOCTL allows an application program to perform receive DC offset calibration on demand while the

FXO line is in on-hook state,

Description

Performs receive offset calibration.

#define M1966_PERF_RX_OFFSET_CALIB _IOWR(0xA4, 0xF7, unsigned int)

Prototype

int ioctl (

int chan_fd,

int M1966_PERF_RX_OFFSET_CALIB,

unsigned long param );

Parameters

Data Type Name Description

int

chan_fd

Channel descriptor.

int

M1966_PERF_RX_OFFSET_CALIB

I/O control identifier for this operation.

unsigned long

param

N/A.

Return Values

Data Type Description

int

0 – Successful.

-EFAULT– Failed to perform offset calibration.

Example

The following example code illustrates how this IOCTL is used.

Int ret;

ret = ioctl (fd, M1966_PERF_RX_OFFSET_CALIB, NULL);

if (ret < 0)

printf (“Failed to perform offset calibration, error code: %d”, ret);

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Maxim-integrated 73M1866B/73M1966B Reference Driver Uživatelský manuál Strana 36