diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 5c995c4..9bb473b 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -16,6 +16,18 @@ jobs:
         uses: actions/checkout@v4
       - name: Work around CVE-2022-24765
         run: git config --global --add safe.directory "$GITHUB_WORKSPACE"
-      - name: Compile blink app
+      - name: Validate changes on SAM D11
         run: make
-        working-directory: 'examples/blink'
+        working-directory: 'tests/blink_samd11'
+      - name: Validate changes on SAM D21
+        run: make
+        working-directory: 'tests/blink_samd21'
+      - name: Validate changes on SAM D51
+        run: make
+        working-directory: 'tests/blink_samd51'
+      - name: Validate changes on SAM L21
+        run: make
+        working-directory: 'tests/blink_saml21'
+      - name: Validate changes on SAM L22
+        run: make
+        working-directory: 'tests/blink_saml22'
diff --git a/tests/blink_samd11/Makefile b/tests/blink_samd11/Makefile
new file mode 100644
index 0000000..35edba6
--- /dev/null
+++ b/tests/blink_samd11/Makefile
@@ -0,0 +1,15 @@
+# Keep this first line.
+GOSSAMER_PATH = ../..
+
+# If your firmware targets a specific board, specify it here,
+# or omit it and provide it on the command line (make BOARD=foo).
+BOARD=feather_d11_soic
+
+# Leave this line here.
+include $(GOSSAMER_PATH)/make.mk
+
+SRCS += \
+  ./app.c \
+
+# Finally, leave this line at the bottom of the file.
+include $(GOSSAMER_PATH)/rules.mk
diff --git a/tests/blink_samd11/app.c b/tests/blink_samd11/app.c
new file mode 100644
index 0000000..fd899c5
--- /dev/null
+++ b/tests/blink_samd11/app.c
@@ -0,0 +1,15 @@
+#include "app.h"
+#include "delay.h"
+
+void app_init(void) {
+}
+
+void app_setup(void) {
+    HAL_GPIO_LED_out();
+}
+
+bool app_loop(void) {
+    HAL_GPIO_LED_toggle();
+    delay_ms(500);
+    return false;
+}
diff --git a/tests/blink_samd21/Makefile b/tests/blink_samd21/Makefile
new file mode 100644
index 0000000..77e5044
--- /dev/null
+++ b/tests/blink_samd21/Makefile
@@ -0,0 +1,15 @@
+# Keep this first line.
+GOSSAMER_PATH = ../..
+
+# If your firmware targets a specific board, specify it here,
+# or omit it and provide it on the command line (make BOARD=foo).
+BOARD=feather_m0
+
+# Leave this line here.
+include $(GOSSAMER_PATH)/make.mk
+
+SRCS += \
+  ./app.c \
+
+# Finally, leave this line at the bottom of the file.
+include $(GOSSAMER_PATH)/rules.mk
diff --git a/tests/blink_samd21/app.c b/tests/blink_samd21/app.c
new file mode 100644
index 0000000..fd899c5
--- /dev/null
+++ b/tests/blink_samd21/app.c
@@ -0,0 +1,15 @@
+#include "app.h"
+#include "delay.h"
+
+void app_init(void) {
+}
+
+void app_setup(void) {
+    HAL_GPIO_LED_out();
+}
+
+bool app_loop(void) {
+    HAL_GPIO_LED_toggle();
+    delay_ms(500);
+    return false;
+}
diff --git a/tests/blink_samd51/Makefile b/tests/blink_samd51/Makefile
new file mode 100644
index 0000000..d6022ce
--- /dev/null
+++ b/tests/blink_samd51/Makefile
@@ -0,0 +1,15 @@
+# Keep this first line.
+GOSSAMER_PATH = ../..
+
+# If your firmware targets a specific board, specify it here,
+# or omit it and provide it on the command line (make BOARD=foo).
+BOARD=pybadge_m4
+
+# Leave this line here.
+include $(GOSSAMER_PATH)/make.mk
+
+SRCS += \
+  ./app.c \
+
+# Finally, leave this line at the bottom of the file.
+include $(GOSSAMER_PATH)/rules.mk
diff --git a/tests/blink_samd51/app.c b/tests/blink_samd51/app.c
new file mode 100644
index 0000000..fd899c5
--- /dev/null
+++ b/tests/blink_samd51/app.c
@@ -0,0 +1,15 @@
+#include "app.h"
+#include "delay.h"
+
+void app_init(void) {
+}
+
+void app_setup(void) {
+    HAL_GPIO_LED_out();
+}
+
+bool app_loop(void) {
+    HAL_GPIO_LED_toggle();
+    delay_ms(500);
+    return false;
+}
diff --git a/tests/blink_saml21/Makefile b/tests/blink_saml21/Makefile
new file mode 100644
index 0000000..86a7f75
--- /dev/null
+++ b/tests/blink_saml21/Makefile
@@ -0,0 +1,15 @@
+# Keep this first line.
+GOSSAMER_PATH = ../..
+
+# If your firmware targets a specific board, specify it here,
+# or omit it and provide it on the command line (make BOARD=foo).
+BOARD=feather_low_energy
+
+# Leave this line here.
+include $(GOSSAMER_PATH)/make.mk
+
+SRCS += \
+  ./app.c \
+
+# Finally, leave this line at the bottom of the file.
+include $(GOSSAMER_PATH)/rules.mk
diff --git a/tests/blink_saml21/app.c b/tests/blink_saml21/app.c
new file mode 100644
index 0000000..fd899c5
--- /dev/null
+++ b/tests/blink_saml21/app.c
@@ -0,0 +1,15 @@
+#include "app.h"
+#include "delay.h"
+
+void app_init(void) {
+}
+
+void app_setup(void) {
+    HAL_GPIO_LED_out();
+}
+
+bool app_loop(void) {
+    HAL_GPIO_LED_toggle();
+    delay_ms(500);
+    return false;
+}
diff --git a/tests/blink_saml22/Makefile b/tests/blink_saml22/Makefile
new file mode 100644
index 0000000..4e4c007
--- /dev/null
+++ b/tests/blink_saml22/Makefile
@@ -0,0 +1,15 @@
+# Keep this first line.
+GOSSAMER_PATH = ../..
+
+# If your firmware targets a specific board, specify it here,
+# or omit it and provide it on the command line (make BOARD=foo).
+BOARD=sensorwatch_red
+
+# Leave this line here.
+include $(GOSSAMER_PATH)/make.mk
+
+SRCS += \
+  ./app.c \
+
+# Finally, leave this line at the bottom of the file.
+include $(GOSSAMER_PATH)/rules.mk
diff --git a/tests/blink_saml22/app.c b/tests/blink_saml22/app.c
new file mode 100644
index 0000000..fd899c5
--- /dev/null
+++ b/tests/blink_saml22/app.c
@@ -0,0 +1,15 @@
+#include "app.h"
+#include "delay.h"
+
+void app_init(void) {
+}
+
+void app_setup(void) {
+    HAL_GPIO_LED_out();
+}
+
+bool app_loop(void) {
+    HAL_GPIO_LED_toggle();
+    delay_ms(500);
+    return false;
+}