Example projects for the GNU PRU toolchain

The pru-gcc toolchain source and build instructions are located at https://github.com/dinuxbg/gnupru .

The following simple examples are available. Check the README.md in each subdirectory for detailed instructions.

blinking-led

The "hello world" example of the embedded world. Both PRU cores of a Beaglebone Black are started to toggle GPIOs. PRU0 core is programmed in C, while the firmware for PRU1 core is written in assembler.

Two host loader examples are provided - one for the old UIO mechanism, and one for the new Remoteproc driver.

blinking-led++

Blinking led firmware written in C++.

button-blinking-led

Button-controlled blinking LED. Shows both basic input and basic output.

hc-sr04-range-sensor

Remoteproc/rpmsg example for measuring distance using the HC-SR04 ultrasound range sensor.

md5-check

Calculate MD5 checksum for a known data chunk on both the ARM loader and one PRU core. Then UIO-based loader reads and compares the two checksums.

ov7670-cam

PRUs on a Beaglebone White fetch RGB565 streams from two OV7670 camera modules. The UIO host-side loader then saves the images from the shared DDR-SDRAM memory into PPM files. The example shows how to access shared buffers in DDR-SDRAM, and how to write time-critical code sequences in inline assembly.

sim-hello

Simulate your PRU executable on your PC. Note that pru-run is an ISA only simulator. Digital I/O is not simulated. Neither is OCP access.

sim-hello++

Same simulator project as sim-hello, but written in C++ instead of C.

External Projects

Some examples are too complex to pile up in this repository, yet could be useful as a reference.

• BeagleMic Microphone Array