Dear sirs, I'm using uClinux with Xenomai on BF537 and it works fine.
But, I need to understand the best strategy to use about Linux/Xenomai and userspace/kernelspace. I'm using sport driver for audio input/ouput and my application does audio alghoritms on these buffers (I'm working fine with 16x2 sample @48khz that is something like 2ms of audio latency time). The driver is developed in Linux environment (without real time), using 2d-dma buffering and dma_copy in function read/write. Then, I develop, in userspace, application using Xenomai native library with function such as: rt_task_create rt_task_start and inside the real time task I'm using read/write function according to the char device driver sport. The priority of the task is set to 99. Anyway, when I'm using this configuration, sometimes a calling to a webserver (that is running on the same machine) could cause an error on the audio output, so I think that something is not in real time environment. So the question is, what I need to do? 1) write real time driver (very difficult now for me) 2) write userspace application with real time interrupt and dma management? If yes, I don't understand if in Xenomai context I can set the Blackfin register from a userspace application or if in Xenomai context has no sense to speak about user/kernel space. Sorry for my confusion. Best regards, Daniele.
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