I am trying to use the on-board analog sound output on a CubieBoard2 (A20) with a program that I developed on the PC platform.
It uses 16bit 48000 samples/s stereo audio output, and tries to set a 16384 frame buffer (16 periods of 1024 frames). The driver on the CubieBoard2 (from the current version of Cubian) refuses this setting and limits the number of periods to 8 and the buffer size to 8192 frames. I can find the 8-period limit in the driver source that I retrieved using git clone -b sunxi-3.4 --depth 1 https://github.com/linux-sunxi/linux-sunxi.git (I'm not completely certain that this is the source of the kernel I am running). Is it a hardware-determined limitation? However, when I change my program to use 2048-frame periods, it still limits the buffer to 8192 periods, now 4. I wonder if there is some way to get around this, or if this is a hardware limitation that can not be fixed in the driver (and so I will have to change my program to work around having the smaller buffer)? Rob -- You received this message because you are subscribed to the Google Groups "linux-sunxi" group. To unsubscribe from this group and stop receiving emails from it, send an email to linux-sunxi+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
