<record type="vinyl" stuck=yes> This is what my mailbox looks like:
602 Jan 28 Jacky Lam ( 14) Porting Jprof(mozilla) to ARM 603 N Jan 30 Yick Lam ( 46) >Clicks in Audio Playback on ARM7500FE 604 T Jan 27 Erik Andersen ( 11) Re: NWFPE fix (part 2) 605 Jan 28 Vaibhav Chitnis ( 51) LCD display flickering. -*-Mutt: /var/mail/linux [Msgs:731 New:5 Post:2 3.8M]---(threads/date)--(82%)--- Notice the message number on the left hand side. Notice the total number of messages. If you start a new thread, don't reply to an existing message, because it'll get buried pages back in my mailbox. </record> On Wed, Jan 30, 2002 at 05:47:22PM +0800, Yick Lam wrote: > I recorded some raw sound file (PCM) in a PC. I transferred > the PCM to my Linux system (ARM7500FE) and play it back by copying > the PCM file to my driver (a character device). The sound I heard > is ok and there is no "clicks". This proves that my driver is > implemented correctly somehow.... I myself have no experience of the ARM7500FE, especially the sound stuff. However, iirc, the DMA controller has two buffers, and Linux is supposed to set both buffers up, fire off the DMA. When the first buffer completes, it has sufficient time to reprogram the first buffer before the second one completes. Note that adding printk's into the DMA support stuff will definitely cause it to miss the required timings. Apart from that, I can't really help much more - I don't have functional ARM7500FE hardware to test this on. _______________________________________________ http://lists.arm.linux.org.uk/mailman/listinfo/linux-arm Please visit the above address for information on this list.
