Hi, I'm currently developing an ALSA ioplug plugin which should transfer audio samples over UART to a DSP (I already wrote that in a previous post). The DSP wants to receive 156 - 164 audio samples with a sampling rate of 8 kHz and a format of S16_LE each 20 msec (which is more or less the number of audio samples multiplied by the period length of the sampling rate). My idea is to add a high precision delay to the transfer callback of the ALSA plugin. Unfortunately, I found out that the hrtimer resolution on the system is as low as 10ms: ------------------------------------------------------------------- kernel: hrtimer resolution: 0 sec, 10000000 nsec, loops_per_jiffy: 448512 ------------------------------------------------------------------- * Does this mean that if I use nanosleep for example each delay has to be an integral multiple of the hrtimer precision and for example a delay of 15ms would not be supported (since it is no integral multiple of 10ms) ? * It is possible to increase the precision (e.g. by changing the kernel configuration) ? * Do you know a better solution for the task, where the task is to send and receive audio samples to/from the DSP over UART and the timing is critical ? cheers, Stefan _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
