Hi Brandon, Appreciate your help. I was able to resolve the issue.
-Rakesh On Thursday, August 14, 2014 7:28:04 AM UTC+5:30, Brandon I wrote: > > You have to enable the ocp master port (section 10.1.2) to access main > memory. Here's an explanation > <http://nomel.tumblr.com/post/30006622413/beaglebone-tutorial-accessing-main-memory-from-the-pru> > . > > And, the resulting code is (if you want to do it in the pru): > > // clear STANDBY_INIT bit in syscfg register so memory between pru <-> > system can be accessed (enable ocp master) > LBCO r0, C4, 4, 4 > CLR r0, r0, 4 > SBCO r0, C4, 4, 4 > > See section 3.1.2 in the pru reference > <https://github.com/beagleboard/am335x_pru_package> for limitations > (accessing memory below main memory 0x00080000 requires enabling an offset, > section 10.1.10). > > > > On Wed, Aug 13, 2014 at 2:02 PM, rakesh.safir <[email protected] > <javascript:>> wrote: > >> Hi, >> >> I want to use the DCAN interface on PRU-ICSS to send/receive data present >> on DDR RAM at a fixed physical address. >> >> - Address of DDR is 0x8000_0000 to 0x9000_0000(256MiB) >> - My buffer is present at 0x8FF0_0000 to 0x9000_0000 (1MiB) >> >> As soon as I access the hardware address 0x8FF0_0000 the PRU-ICSS goes >> into some faulty state and becomes unresponsive. >> >> Is there some other way to access DDR from PRU-ICSS ? >> >> Rakesh >> >> On Thursday, May 16, 2013 2:42:39 AM UTC+5:30, Jason Kridner wrote: >>> >>> Frequently asked questions regarding "PRU": >>> >>> - What is a "PRU"? >>> - PRU stands for Programmable Real-time Unit. The overall subsystem >>> is typically called the ICSS, PRU-ICSS or PRUSS. ICSS stands for >>> Industrial Communications Subsystem and PRUSS stands for Programmable >>> Real-time Unit Subsystem. >>> - What does a PRU do? >>> - A PRU is a 200MHz microcontroller that is really useful at >>> "bitbanging" and has some peripherals attached to it that make it >>> well >>> suited for building real-time interfaces to all types of digital >>> electronics. >>> - What are the processing elements within the AM33xx PRUSS used on >>> BeagleBone and BeagleBone Black? >>> - 2 32-bit 200MHz PRU cores >>> - Each with 8KB of program memory >>> - Direct access to general purpose I/O >>> - Single cycle operations without cache or pipelines >>> (instructions *always* 5ns) >>> - Shared 12KB data memory >>> - Scratch pad registers >>> - Parallel and serial capture modes >>> - 32-bit port to memory and other peripherals outside of the >>> PRUSS, including external memory >>> - What are some example things built out of PRUs? >>> - DMX512 lighting protocol: http://beagleboard. >>> org/CapeContest/entries/BeagleBone+DMX+Cape/ >>> <http://beagleboard.org/CapeContest/entries/BeagleBone+DMX+Cape/> >>> - 6502 memory interface: http://elinux.org/ >>> images/a/ac/What's_Old_Is_New-_A_6502-based_Remote_Processor.pdf >>> >>> <http://elinux.org/images/a/ac/What's_Old_Is_New-_A_6502-based_Remote_Processor.pdf> >>> >>> - Emulated memory interface on an Atari 600XL with BeagleBone >>> decoding video directly into Atari 600XL display memory: >>> http://www.youtube.com/watch?v=1irR4TQ5aMA >>> <http://www.youtube.com/watch?v=1irR4TQ5aMA> >>> - Nixie tube interface: https://github.com/mranostay/beagle-nixie >>> - Software UART: http://processors.wiki. >>> ti.com/index.php/Soft-UART_Implementation_on_AM335X_PRU_- >>> _Software_Users_Guide >>> >>> <http://processors.wiki.ti.com/index.php/Soft-UART_Implementation_on_AM335X_PRU_-_Software_Users_Guide> >>> >>> - Sine wave generator using PWMs: http://elinux.org/ >>> ECE497_BeagleBone_PRU >>> - 3D printer stepper motor driver: http:// >>> hipstercircuits.com/pypruss-a-simple-pru-python-binding-for- >>> beaglebone/ >>> >>> <http://hipstercircuits.com/pypruss-a-simple-pru-python-binding-for-beaglebone/> >>> >>> - Camera interface: http://www.hitchhikeree.org/beaglebone_ >>> capes/interacto/ >>> - Where do I get some more details? >>> - https://github.com/beagleboard/am335x_pru_package is the >>> official location for documentation and tools for the PRUSS on >>> BeagleBone >>> and BeagleBone Black. >>> - http://elinux.org/Ti_AM33XX_PRUSSv2 is the community wiki page. >>> >>> >>> -- >> For more options, visit http://beagleboard.org/discuss >> --- >> You received this message because you are subscribed to a topic in the >> Google Groups "BeagleBoard" group. >> To unsubscribe from this topic, visit >> https://groups.google.com/d/topic/beagleboard/u28ytaoNenU/unsubscribe. >> To unsubscribe from this group and all its topics, send an email to >> [email protected] <javascript:>. >> For more options, visit https://groups.google.com/d/optout. >> > > -- 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 [email protected]. For more options, visit https://groups.google.com/d/optout.
