linux aic23音频驱动 录音/播放 报错

lbird_11

请高手帮忙看下,是哪里的问题

dm6446开发版  linux2.6.18的内核 外接的音频芯片是tlv320aic23

root@192.168.1.203:/test# cat /dev/sndstat
Sound Driver:3.8.1a-980706 (ALSA v1.0.12rc1 emulation code)
Kernel: Linux 192.168.1.203 2.6.18_pro500-davinci_evm-arm_v5t_le #1 PREEMPT Fri Nov 21 16:04:04 CST 2014 armv5tejl
Config options: 0

Installed drivers:
Type 10: ALSA emulation

Card config:
DaVinci EVM (tlv320aic23)

Audio devices:
0: tlv320aic23-0 (DUPLEX)

Synth devices: NOT ENABLED IN CONFIG

Midi devices: NOT ENABLED IN CONFIG

Timers:
7: system timer

Mixers:
0: mixer00
root@192.168.1.203:/test#


root@192.168.1.203:/test# cat /dev/dsp >/test.wav
cat: /dev/dsp: Input/output error
root@192.168.1.203:/test#  
root@192.168.1.203:/test#  
root@192.168.1.203:/test# cat /test.wav >/dev/dsp
root@192.168.1.203:/test#
root@192.168.1.203:/test#
root@192.168.1.203:/test#  cat  /readsun.wav >/dev/dsp
cat: write error: Input/output error
root@192.168.1.203:/test#