GPIO classes for controlling GPIO pins and PWM

Using WiringPi (gpio command) for PWM and
sysfs control using file descriptors for control of pin read/write

Requires a tweak to the Pi SD card image to install gpio

Includes a bash script to turn LEDs on and off

Change-Id: Iaa254e026db336b09758d24eb1ddcffccfb27655
Signed-off-by: Jim Ostrowski <yimmy13@gmail.com>
diff --git a/frc971/raspi/rootfs/make_sd.sh b/frc971/raspi/rootfs/make_sd.sh
index 3bafacc..4c50a6b 100755
--- a/frc971/raspi/rootfs/make_sd.sh
+++ b/frc971/raspi/rootfs/make_sd.sh
@@ -34,9 +34,10 @@
 
 # Put a timestamp on when this card got created and by whom
 TIMESTAMP_FILE="${PARTITION}/home/pi/.DiskFlashedDate.txt"
-date > "${TIMESTAMP_FILE}"
-git rev-parse HEAD >> "${TIMESTAMP_FILE}"
-whoami >> "${TIMESTAMP_FILE}"
+echo "Date Imaged: "`date` > "${TIMESTAMP_FILE}"
+echo "Image file: ${IMAGE}"  >> "${TIMESTAMP_FILE}"
+echo "Git tag: "`git rev-parse HEAD` >> "${TIMESTAMP_FILE}"
+echo "User: "`whoami` >> "${TIMESTAMP_FILE}"
 
 echo "Starting a shell for any manual configuration"
 target /bin/bash --rcfile /root/.bashrc