1*4882a593Smuzhiyun.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later 2*4882a593Smuzhiyun.. c:namespace:: RC 3*4882a593Smuzhiyun 4*4882a593Smuzhiyun.. _lirc_get_rec_resolution: 5*4882a593Smuzhiyun 6*4882a593Smuzhiyun***************************** 7*4882a593Smuzhiyunioctl LIRC_GET_REC_RESOLUTION 8*4882a593Smuzhiyun***************************** 9*4882a593Smuzhiyun 10*4882a593SmuzhiyunName 11*4882a593Smuzhiyun==== 12*4882a593Smuzhiyun 13*4882a593SmuzhiyunLIRC_GET_REC_RESOLUTION - Obtain the value of receive resolution, in microseconds. 14*4882a593Smuzhiyun 15*4882a593SmuzhiyunSynopsis 16*4882a593Smuzhiyun======== 17*4882a593Smuzhiyun 18*4882a593Smuzhiyun.. c:macro:: LIRC_GET_REC_RESOLUTION 19*4882a593Smuzhiyun 20*4882a593Smuzhiyun``int ioctl(int fd, LIRC_GET_REC_RESOLUTION, __u32 *microseconds)`` 21*4882a593Smuzhiyun 22*4882a593SmuzhiyunArguments 23*4882a593Smuzhiyun========= 24*4882a593Smuzhiyun 25*4882a593Smuzhiyun``fd`` 26*4882a593Smuzhiyun File descriptor returned by open(). 27*4882a593Smuzhiyun 28*4882a593Smuzhiyun``microseconds`` 29*4882a593Smuzhiyun Resolution, in microseconds. 30*4882a593Smuzhiyun 31*4882a593SmuzhiyunDescription 32*4882a593Smuzhiyun=========== 33*4882a593Smuzhiyun 34*4882a593SmuzhiyunSome receivers have maximum resolution which is defined by internal 35*4882a593Smuzhiyunsample rate or data format limitations. E.g. it's common that 36*4882a593Smuzhiyunsignals can only be reported in 50 microsecond steps. 37*4882a593Smuzhiyun 38*4882a593SmuzhiyunThis ioctl returns the integer value with such resolution, with can be 39*4882a593Smuzhiyunused by userspace applications like lircd to automatically adjust the 40*4882a593Smuzhiyuntolerance value. 41*4882a593Smuzhiyun 42*4882a593SmuzhiyunReturn Value 43*4882a593Smuzhiyun============ 44*4882a593Smuzhiyun 45*4882a593SmuzhiyunOn success 0 is returned, on error -1 and the ``errno`` variable is set 46*4882a593Smuzhiyunappropriately. The generic error codes are described at the 47*4882a593Smuzhiyun:ref:`Generic Error Codes <gen-errors>` chapter. 48