“cat: write error: No space left on device” when I write to a character device using “cat”
I am trying to use VS1053, an audio decoder, on Linux 4.14 to play music. This device communicate through SPI bus, and I've developed a driver and registered VS1053 as a character device, thanks for https://github.com/rvp-nl/vs10xx-linux. Here comes the problem.
The way to play music is:
cat musicfile.mp3 > /dev/VS1053_device
When I throw a WAV music file to the device, everything is ok, and music plays well. However, when I throw a mp3 music file to the device, Linux casts an error
cat: write error: No space left on device
I've searched for the reason on many sites. Many said, check free space and free inode on file system, but this is my result:
[email protected]:~# df -i Filesystem Inodes IUsed IFree IUse% Mounted on /dev/root 956592 10795 945797 2% / devtmpfs 234285 308 233977 1% /dev tmpfs 234333 205 234128 1% /run tmpfs 234333 10 234323 1% /var/volatile [email protected]:~# df -h Filesystem Size Used Avail Use% Mounted on /dev/root 15G 412M 14G 3% / devtmpfs 916M 0 916M 0% /dev tmpfs 916M 84K 916M 1% /run tmpfs 916M 28K 916M 1% /var/volatile [email protected]:~#
The music file is limited within 100MB, there is no way that the space is used up.
I tried to write an print file program to substitute "cat", but that doesn't work either. I have no idea why and how this error happened.
I am super grateful if anyone could help me on this!!!
try the below command:
tune2fs -l /dev/VS1053_device | grep -i reserved
And cat is not suitable for the operation you are performing.The MP3 format has all sorts of junk that can lurk at the front and end of the file and this needs to be strippe out.Try with ffmpeg or mp3wrap or aplay