Added "Hello World" example to sdk git

[ysapir]

Just added a "Hello World" example to the epiphany-sdk repository.

This is much simpler than the "matmul" example and shows very basic concepts of setting up a host-device application and message passing.

[anupkini]

Hi Yaniv,

Thanks for the hello_world example.

I built the e-gcc and epiphany-sdk from source successfully a while ago.

When i try to run the build script from hello_world, i end up with the following error.

/usr/bin/ld: cannot find -le-hal
collect2: ld returned 1 exit status.

This is the part that compiles the host code. I am running the build.sh from the Zedboard and not my laptop
Let me know if i am doing something wrong

[ysapir]

1. Please make sure your EPIPHANY_HOME environment variable is set correctly (normally, /opt/adapteva/esdk ).

2. Add:

echo $EPIPHANY_HOME
echo $ESDK
echo $ELIBS
echo $EHDF

to the run.sh script (or just "set -x") to see if variables are set correctly.

3. Look if the libe-hal.so file is at "$EPIPHANY_HOME/tools/host/lib".

[anupkini]

Fixed it !!

I had to change epiphany_libs/build.sh file to point to the 16 core version BSP.
Also, in the run script the EHDF=${EPIPHANY_HDF} , was pointing to null location.

Changed it to point to current/*.hdf,

Thanks for pointing me to the solution.