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OpenPRU Examples

Projects
Supported processors per-project

This directory contains example PRU projects.

Projects

custom_frequency_generator

  • Generate a square wave with a configurable average clock frequency

empty

  • The empty project can be used for PRU firmware development in assembly

empty_c

  • The empty_c project can be used for PRU firmware development in C, and mixed C and assembly

fft/split_radix_fft_4k_single_core

  • Use a real-valued DIT Split-Radix algorithm to perform a 4096-point Fast-Fourier Transform (FFT) on 4096 discrete input samples

fft/split_radix_fft_post_processing

  • Extract FFT magnitude information from the output of split_radix_fft_4k_single_core

gcc_rpmsg_echo_linux

  • Show how to compile RPMSG firmware using the GNU toolchain for PRU.

LCD_interface

  • Use PRU direct GPOs to output data from frame buffer memory to a parallel RGB24 interface. The LCD display is 800x480 pixel with 24 bit color and 60 Hz frame rate

logic_scope

  • PRU cores implement a simple logic scope by continuously sampling input signals. The captured trace data can be viewed with a tool like PulseView

pru_emif

  • Emulate an Extended Memory Interface (EMIF) client 16-bit/32-bit asynchronous parallel interface to interface with C2K F28379D

spi_loopback

  • Implement a loopback SPI connection between 2 PRU cores that act as SPI master and SPI slave

fir

  • Implements a 64-tap FIR filter on PRU with 32 bit fixed-point precision inputs(Q31).

multicore_scheduler

  • Makes use of IEP timer along with Task Managers in 6 cores to schedule tasks in 6 cores back to back with no delay in between.

Supported processors per-project

Each project is tested on at least one processor. Many projects can be ported to other processors, even if the project does not currently have a build configuration for the other processors.

For more information about porting PRU projects to different processors, refer to app note PRU Subsystem Migration Guide. For more information about the PRU features on each processor, refer to app note PRU Subsystem Features Comparison.

  • Y = project has build infrastructure for this processor
  • Yport = project can be ported to this processor
  • Npru = project is not compatible with the PRU subsystem on this processor
    • The project cannot be ported to this processor
  • N-hw = project relies on SoC hardware that does not exist on this processor
    • The project cannot be ported to this processor, unless the project can be modified to work with the new processor's hardware
  • N-sw = project's non-PRU software is not compatible with this processor
    • The PRU firmware may be able to be ported to this processor, but you will need to write new code for the non-PRU cores
    • There may be limitations related to the OS (for example, let's say the project requires a real-time OS that always responds within 10 usec. This project would not work with OSes like Linux, or even RT Linux)
Project am243x am261x am263px am263x am62x am64x
custom_frequency_generator Y Yport Yport Yport Yport Yport
empty Y Y Y Y Y Y
empty_c Y Y Y Y Y Y
fft/
split_radix_fft_4k_single_core Y Y Yport Yport Yport Yport
split_radix_fft_post_processing Y Yport Yport Yport Yport Yport
LCD_interface Y Yport Yport Yport N-sw Yport
logic_scope Y Yport Yport Yport Yport Yport
pru_emif Y Yport Yport Yport N-sw Yport
spi_loopback Y Yport Yport Yport N-sw Yport
fir Y Yport Yport Yport Yport Yport
multicore_sheduler Y Npru Npru Npru Npru Yport