From c7acafda3c6fd4d91990f76753bf211820a82038 Mon Sep 17 00:00:00 2001
From: 9names <60134748+9names@users.noreply.github.com>
Date: Thu, 28 Jul 2022 10:14:20 +1000
Subject: [PATCH] GPIO IRQ example: add check for interrupt source (#401)

---
 rp2040-hal/examples/gpio_irq_example.rs | 17 ++++++++++-------
 1 file changed, 10 insertions(+), 7 deletions(-)

diff --git a/rp2040-hal/examples/gpio_irq_example.rs b/rp2040-hal/examples/gpio_irq_example.rs
index e5a84fd..3365857 100644
--- a/rp2040-hal/examples/gpio_irq_example.rs
+++ b/rp2040-hal/examples/gpio_irq_example.rs
@@ -174,14 +174,17 @@ fn IO_IRQ_BANK0() {
         // these will be of type `&mut LedPin` and `&mut ButtonPin`, so we don't have
         // to move them back into the static after we use them
         let (led, button) = gpios;
+        // Check if the interrupt source is from the pushbutton going from high-to-low.
+        // Note: this will always be true in this example, as that is the only enabled GPIO interrupt source
+        if button.interrupt_status(EdgeLow) {
+            // toggle can't fail, but the embedded-hal traits always allow for it
+            // we can discard the return value by assigning it to an unnamed variable
+            let _ = led.toggle();
 
-        // toggle can't fail, but the embedded-hal traits always allow for it
-        // we can discard the return value by assigning it to an unnamed variable
-        let _ = led.toggle();
-
-        // Our interrupt doesn't clear itself.
-        // Do that now so we don't immediately jump back to this interrupt handler.
-        button.clear_interrupt(EdgeLow);
+            // Our interrupt doesn't clear itself.
+            // Do that now so we don't immediately jump back to this interrupt handler.
+            button.clear_interrupt(EdgeLow);
+        }
     }
 }