meta-digi: Add Edge TPU simple camera examples

This commit adds the Edge TPU simple camera examples to exercise the Google
Coral devices with Digi Embedded Yocto.

https://onedigi.atlassian.net/browse/DEL-7547

Signed-off-by: Arturo Buzarra <arturo.buzarra@digi.com>

meta-digi-arm/recipes-bsp/libedgetpu/files/0001-gstreamer-fix-video-sink-for-wayland-images.patch

@@ -0,0 +1,27 @@
+From: Arturo Buzarra <arturo.buzarra@digi.com>
+Date: Mon, 28 Jun 2021 15:00:58 +0200
+Subject: [PATCH] gstreamer: fix video sink for wayland images
+
+Signed-off-by: Arturo Buzarra <arturo.buzarra@digi.com>
+---
+ gstreamer/gstreamer.py | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/gstreamer/gstreamer.py b/gstreamer/gstreamer.py
+index 2676439..e055d77 100644
+--- a/gstreamer/gstreamer.py
++++ b/gstreamer/gstreamer.py
+@@ -249,11 +249,11 @@ def run_pipeline(user_function,
+         scale_caps = 'video/x-raw,width={width},height={height}'.format(width=scale[0], height=scale[1])
+         PIPELINE += """ ! tee name=t
+             t. ! {leaky_q} ! videoconvert ! videoscale ! {scale_caps} ! videobox name=box autocrop=true
+                ! {sink_caps} ! {sink_element}
+             t. ! {leaky_q} ! videoconvert
+-               ! rsvgoverlay name=overlay ! videoconvert ! ximagesink sync=false
++               ! rsvgoverlay name=overlay ! videoconvert ! waylandsink sync=false
+             """
+
+     SINK_ELEMENT = 'appsink name=appsink emit-signals=true max-buffers=1 drop=true'
+     SINK_CAPS = 'video/x-raw,format=RGB,width={width},height={height}'
+     LEAKY_Q = 'queue max-size-buffers=1 leaky=downstream'
+--

meta-digi-arm/recipes-bsp/libedgetpu/libedgetpu-examples_git.bb

@@ -0,0 +1,34 @@
+SUMMARY = "Edge TPU simple camera examples"
+HOMEPAGE = "https://coral.ai/examples"
+LICENSE = "Apache-2.0"
+LIC_FILES_CHKSUM = "file://LICENSE;md5=3b83ef96387f14655fc854ddc3c6bd57"
+
+SRCREV = "19335531f599133e054ec2ddcc31733d24031ba5"
+SRC_URI = "git://github.com/google-coral/examples-camera.git;protocol=https \
+           file://0001-gstreamer-fix-video-sink-for-wayland-images.patch \
+           "
+
+S = "${WORKDIR}/git"
+
+inherit gobject-introspection
+
+RDEPENDS_${PN} = "python3-pycoral \
+                  gstreamer1.0-plugins-base \
+"
+
+do_configure() {
+    bash download_models.sh
+}
+
+do_install() {
+    # Install Gstreamer examples
+    install -d ${D}/opt/libedgetpu
+    install -d ${D}/opt/libedgetpu/all_models
+    install -d ${D}/opt/libedgetpu/gstreamer
+    rm -f ${S}/gstreamer/install_requirements.sh
+    install -m 0555 ${S}/all_models/* ${D}/opt/libedgetpu/all_models/
+    install -m 0555 ${S}/gstreamer/* ${D}/opt/libedgetpu/gstreamer/
+}
+
+FILES_${PN} += "/opt/libedgetpu/* \
+"