Hi, I've got PRU0 of my BBB pulling in 12 Bytes of data from a ADC with a sampling frequency of 31250hz.
I want to stash all of this data in an array that lives in DDR memory. I would like to make the array 0x4000 bytes (16kB) large. This would give me 1365 12 byte records and about 43ms of data to play with. I'm currently using prussdrv_map_extmem() to hook me up with the DDR memory. It provides me with a memory block that is 256kB, so I have plenty of room. The question I have is... can I count on the physical address in this 256kB block of memory to be contiguous? I'm pretty new to linux memory management, but I see that the "page size" is only 4kB... so I imagine that the virtual memory system might chop my 256kB block up into bits which might not necessarily have contiguous addresses. If I can count on contiguous addresses, this radically simplifies the memory access code in the PRU. If I can't... well, then I can't, and I've got to figure something else out. When I run experiments I see that the physical addresses are contiguous, but are they guaranteed to be? or has this just been "lucky"? Thanks, Bill -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
