##My PRU Stuffs
This repository contains my notes and code as I play with the AM3359 PRU on the BeagleBone Black.
###Links
###Setup
These were the steps I took to setup the assembler and the prussdrv C library
on the BBB. I started with this: http://elinux.org/BeagleBone_PRU_Notes
First, install the PRU assembler and prussdrv library:
# cd ~
# git clone [email protected]:beagleboard/am335x_pru_package.git
# cd am335x_pru_package
# make
# make install
This put libprussdrv.so in /usr/local/lib, which was not in my gcc library path,
so I added it by putting this into ~/.bashrc:
export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/local/lib
Then source it with:
# . ~/.bashrc
Next the PRU needs to be enabled, which can be done with a Device Tree overlay that was included with the Debian image I'm using:
# echo BB-BONE-PRU-01 > /sys/devices/bone_capemgr.*/slots
Next enable the uio_pruss kernel module, which exports PRU host event interrupts to user-space, and also exposes the PRU L3 RAM and DDR RAM for user-space reading and writing:
# modprobe uio_pruss
The PRUSS should now be ready to use! The am335x_pru_package includes a few demos:
# cd ~/am335x_pru_package/pru_sw/example_apps/bin
# ./PRU_memAcc_DDR_sharedRAM
If all goes well you should see:
INFO: Starting PRU_memAcc_DDR_sharedRAM example.
INFO: Initializing example.
INFO: Executing example.
INFO: Waiting for HALT command.
INFO: PRU completed transfer.
Example executed succesfully.
###Examples
Included example programs:
- Blink:
./examples/blink/ - Blink until button press:
./examples/blink_until_button/
###Helper libraries
I've split out some helpful assembly into macros and put them into their own
files inside examples/include/.