From 76c1830aeb0206f25d8af963df709d804aa5f437 Mon Sep 17 00:00:00 2001
From: bruelltuete <jo@bruelltuete.com>
Date: Tue, 3 May 2022 17:46:27 +0100
Subject: [PATCH] Add gpio_deinit (#793)

---
 src/rp2_common/hardware_gpio/gpio.c                  | 4 ++++
 src/rp2_common/hardware_gpio/include/hardware/gpio.h | 7 +++++++
 2 files changed, 11 insertions(+)

diff --git a/src/rp2_common/hardware_gpio/gpio.c b/src/rp2_common/hardware_gpio/gpio.c
index 2816b97..4197a4b 100644
--- a/src/rp2_common/hardware_gpio/gpio.c
+++ b/src/rp2_common/hardware_gpio/gpio.c
@@ -217,6 +217,10 @@ void gpio_init(uint gpio) {
     gpio_set_function(gpio, GPIO_FUNC_SIO);
 }
 
+void gpio_deinit(uint gpio) {
+    gpio_set_function(gpio, GPIO_FUNC_NULL);
+}
+
 void gpio_init_mask(uint gpio_mask) {
     for(uint i=0;i<32;i++) {
         if (gpio_mask & 1) {
diff --git a/src/rp2_common/hardware_gpio/include/hardware/gpio.h b/src/rp2_common/hardware_gpio/include/hardware/gpio.h
index 7037e85..4449d50 100644
--- a/src/rp2_common/hardware_gpio/include/hardware/gpio.h
+++ b/src/rp2_common/hardware_gpio/include/hardware/gpio.h
@@ -414,6 +414,13 @@ void gpio_acknowledge_irq(uint gpio, uint32_t events);
  */
 void gpio_init(uint gpio);
 
+/*! \brief Resets a GPIO back to the NULL function, i.e. disables it.
+ *  \ingroup hardware_gpio
+ *
+ * \param gpio GPIO number
+ */
+void gpio_deinit(uint gpio);
+
 /*! \brief Initialise multiple GPIOs (enabled I/O and set func to GPIO_FUNC_SIO)
  *  \ingroup hardware_gpio
  *