minimal blinky sketch

Makefile

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+# Keep this first line.
+GOSSAMER_PATH=gossamer
+
+# 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_green
+
+# Leave this line here.
+include $(GOSSAMER_PATH)/make.mk
+
+# Add your source files here.
+SRCS += \
+  ./movement.c \
+
+# Finally, leave this line at the bottom of the file.
+include $(GOSSAMER_PATH)/rules.mk
+

movement.c

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+#include "app.h"
+#include "delay.h"
+
+void app_init(void) {
+}
+
+void app_setup(void) {
+    HAL_GPIO_GREEN_out();
+}
+
+bool app_loop(void) {
+    HAL_GPIO_GREEN_toggle();
+    delay_ms(500);
+
+    return false;
+}