From 2509c206eee78c4dc704ede23e460cb45b2e4191 Mon Sep 17 00:00:00 2001
From: Benjamin Valentin <benpicco@beuth-hochschule.de>
Date: Thu, 13 Aug 2020 00:37:22 +0200
Subject: [PATCH] cpu/lm4f120: GPIO: clear stale interrupt

---
 cpu/lm4f120/periph/gpio.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/cpu/lm4f120/periph/gpio.c b/cpu/lm4f120/periph/gpio.c
index e1b5673266..11d3d94133 100644
--- a/cpu/lm4f120/periph/gpio.c
+++ b/cpu/lm4f120/periph/gpio.c
@@ -262,6 +262,10 @@ void gpio_irq_enable(gpio_t pin)
     const uint8_t pin_num = _pin_num(pin);
     const uint8_t pin_bit = 1<<pin_num;
 
+    /* clear stale interrupt */
+    ROM_GPIOPinIntClear(port_addr, pin_bit);
+
+    /* enable interrupt */
     HWREG(im_reg_addr) |= pin_bit;
 }