tests: drivers: gpio-async: Add small readme

d3zd3z · d3zd3z · commit a7dcabe83d95 · 2025-05-22T16:15:26.000-06:00
Add a short readme to explain some of the difficulties with level
triggered interrupts (notably, most STM32 devices do not support level
triggered interrupts).

Signed-off-by: David Brown &lt;david.brown@linaro.org&gt;
diff --git a/tests/drivers/gpio-async/README.md b/tests/drivers/gpio-async/README.md
@@ -0,0 +1,6 @@
+# Async gpio
+
+This demo makes use of the GPIO `wait_for_high()` and `wait_for_low()` async operations.
+
+Unfortunately, not all GPIO controllers support level triggered interrupts.  Notably, most of the
+stm32 line does not support level triggered interrupts.
