digital-pot: Fix build

Cannot test, requires special hardware.

Signed-off-by: Ola Jeppsson <ola@adapteva.com>

digital-pot/README.md

@@ -41,7 +41,7 @@ Instead, please use my updated version, which can be found [here](https://github
 Compiling Code (assuming ProgramName.cpp is in the same directory as the  
 parallella-utils you downlaoded earlier)
 ```bash
-$ gcc -o [OutputName] [ProgramName].cpp para_spi.cpp para_gpio.cpp para_gpio.c -lstdc++ -Wall
+$ ./build.sh
 ```
 
 ##Usage

digital-pot/build.sh

@@ -0,0 +1,35 @@
+#!/bin/bash
+
+set -e
+
+ESDK=${EPIPHANY_HOME}
+ELIBS=${ESDK}/tools/host/lib
+EINCS=${ESDK}/tools/host/include
+ELDF=${ESDK}/bsps/current/internal.ldf
+
+SCRIPT=$(readlink -f "$0")
+EXEPATH=$(dirname "$SCRIPT")
+cd $EXEPATH
+
+CROSS_PREFIX=
+case $(uname -p) in
+	arm*)
+		# Use native arm compiler (no cross prefix)
+		CROSS_PREFIX=
+		;;
+	   *)
+		# Use cross compiler
+		CROSS_PREFIX="arm-linux-gnueabihf-"
+		;;
+esac
+
+
+GPIO=./parallella-utils/gpio_dir
+
+GPIOSRCS="$GPIO/para_spi.cpp $GPIO/para_gpio.cpp $GPIO/para_gpio.c"
+
+# Build HOST side applications
+[ -e parallella-utils ] || git clone https://github.com/parallella/parallella-utils
+
+${CROSS_PREFIX}g++ -o digital-pot -I$GPIO  digital-pot.cpp $GPIOSRCS
+${CROSS_PREFIX}g++ -o digital-pot-ledfade -I$GPIO digital-pot-ledfade.cpp $GPIOSRCS