Hi, I am investigating the beagleboard black PRUs at the moment for data acquisition and/or transmission. For context I'll explain what I want to do. I want to use a 16 bit ADC/DAC at 100KSps. It is a half duplex system, so I can use both PRUs to receive, then load new firmware and transmit. Starting the transmission must be to 1 us accuracy. Hopefully that will explain what I am trying to do.
I am using the PRU Software package 4.0.2. My kernel is Linux Beaglebone 4.4.9-ti-r25. I have the CCSv6 environment setup and I can build and run examples on the PRU, and I have built a user space example (Pru Lab 6 user space) and it is working fine sending strings to and from both PRUs using RpMsg. Great so far.... I would like to extend the User space example to allow me to fill PRU memory (basically Sine wave sample data to use as a carrier for modulation) , or write directly from user space any samples I want to transmit. Also any examples in user space using the pruss_intc.ko to send/receive interrupts from the PRUs would be good. The data I want to fill into the PRU will fill most of the data memory in the PRU, I don't want to have to load it up piece by piece through RpMsg, which looks to be maximum 512 bytes per transfer. I am hoping to trigger commands through RpMsg for the PRU to read/write data to shared or ARM DDR memory. There are plenty of examples on the PRU side to read/write to shared or DRR memory, so i should be able to plod through the examples to create my code for the PRU. However I can't see any example on the ARM side. Is it possible for a user space program to read/write to shared memory ? Or allocate a section of DDR memory for the each PRU to write to that nothing else will touch ? Also once the ARM is through with writing to shared or DRR memory the PRU generate a ARM Host interrupt (EVOUT1 to EVOUT7). Does pruss_intc.kp map these interrupts to user space, or allow a callback to be added ? I know a lot of questions, apologies if they are basic, new to this. Regards, Paul -- 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]. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/fd3ba9aa-5857-4be4-b624-beca31c15ca4%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
