Hi, Yes, I read the "Writing an ALSA driver". Nevertheless, it seems that the stack can configure the HW with two independent parameters: Buffer size and period size. In such a system where you get the interrupts on a portion of the DMA buffer size those parameters depend on each other. How the ALSA stack can know that? Thanks. -----Original Message----- From: Lee Revell [mailto:rlrevell@xxxxxxxxxxx] Sent: Tuesday, November 07, 2006 9:08 AM To: Assaf Hoffman Cc: alsa-devel@xxxxxxxxxxxxxxxxxxxxx; Rita Shtern Subject: Re: ALSA HW buffer managment On Tue, 2006-11-07 at 08:48 +0200, Assaf Hoffman wrote: > Hi, > As I understood, ALSA buffer management uses the 'periods' notion to > control the latency between SW stack and HW DMA. > My HW is not capable of interrupting the SW on a period basis. The only > interrupt HW generates is on half or quarter of the DMA buffer (for > example, in capture, after each half of the buffer is filled with > samples the HW will signal interrupt). "Period" just refers to the interval between interrupts. So your hardware supports either 2 or 4 periods per buffer. Did you read "Writing an ALSA driver"? Lee ------------------------------------------------------------------------- Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642 _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/alsa-devel
