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From: vivili <no...@do...> - 2014-07-22 07:57:20
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New Revision: http://docs.blackfin.uclinux.org/doku.php?id=linux-kernel: testing Old Revision: http://docs.blackfin.uclinux.org/doku.php?id=linux-kernel: testing&rev=1384763980 Edit Summary: [Device driver test] ad1836 @@ -55,8 +55,9 @@ - ** Audio driver test over SPORT(AD1836)** * One script is to test if the sound device can play with different combination of 16, 8 bit rate and 44100,22000,11000,8000 record speeds. It also includes extra cases to test if recording and playing at the same ti me functions well. It needs listening to the earphone which is connected t o the board to decide whether the case goes right. If you can hear the voi ce periodically, then the case passes, otherwise it fails. * Another script is to test the Multichannel Audio player to see if it support two channels to play at the same time and one channel play, the other channel play while doing records at various bit rate and record spe eds. * AD1836 supports three audio outputs at the same time. We can here from three RCA jacks with priority from high to low: green, black and yell ow. + * AD1836 has two audio inputs. For stereo usage, we usually use blue jack as input. * Spectrum analysis is applied to sine wave files recorded on PC and target board, which can check the quality of sound process. The frequency of these sine waves are:100/250/440/1K/10K Hz. The tool to transform audi o file to power spectrum is snd2dft. Details of this tool is at:[[http://s nd2fftw.sourceforge.net|snd2fftw]]. Spectrum analysis is applied to all ot her audio card drivers we supported. * Build the Linux kernel with audio driver support and audio applica tions.<code> under Customize Kernel Settings == Select Device Drivers == |
