Getting started with the PRU

This short tutorial will explain how to get started with the Programmable Realtime Unit SubSystem using the examples provided at the BeagleBoard PRU package:

First we get the BeagleBoard PRU package:

git clone git://github.com/beagleboard/am335x_pru_package.git
cd am335x_pru_package/pru_sw/app_loader/interface
make CROSS_COMPILE="" # we're compiling right on the system, so no need to cross compile

Now we compile pasm:

cd ../../utils/pasm_source
./linuxbuild

and finally some examples:

cd ../../example_apps

Here we have to change this line for:

PASM?=../utils/pasm

After that small change, the examples should cross-compile natively:

make CROSS_COMPILE=""

Then, cd bin y:

modprobe uio_pruss #load the kernel module
echo BB-BONE-PRU-01 > /sys/devices/bone_capemgr.8/slots #activate the PRU
./PRU_memAccessPRUDataRam

The result should like like:

INFO: Starting PRU_memAccessPRUDataRam example.
        INFO: Initializing example.
        INFO: Executing example.
        INFO: Waiting for HALT command.
        INFO: PRU completed transfer.
INFO: Example executed succesfully.

PRU

Getting started with the PRU

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