Add gpio_set_irqover to match inover/outover/oeover (fixes #265) (#470)

src/host/hardware_gpio/gpio.c

@@ -27,6 +27,10 @@ void gpio_set_pulls(uint gpio, bool up, bool down) {
 
 }
 
+void gpio_set_irqover(uint gpio, uint value) {
+
+}
+
 void gpio_set_outover(uint gpio, uint value) {
 
 }

src/host/hardware_gpio/include/hardware/gpio.h

@@ -61,6 +61,8 @@ void gpio_disable_pulls(uint gpio);
 
 void gpio_set_pulls(uint gpio, bool up, bool down);
 
+void gpio_set_irqover(uint gpio, uint value);
+
 void gpio_set_outover(uint gpio, uint value);
 
 void gpio_set_inover(uint gpio, uint value);

src/rp2_common/hardware_gpio/gpio.c

@@ -57,6 +57,15 @@ void gpio_set_pulls(uint gpio, bool up, bool down) {
     );
 }
 
+// Direct override for per-GPIO IRQ signal
+void gpio_set_irqover(uint gpio, uint value) {
+    invalid_params_if(GPIO, gpio >= NUM_BANK0_GPIOS);
+    hw_write_masked(&iobank0_hw->io[gpio].ctrl,
+                   value << IO_BANK0_GPIO0_CTRL_IRQOVER_LSB,
+                   IO_BANK0_GPIO0_CTRL_IRQOVER_BITS
+    );
+}
+
 // Direct overrides for pad controls
 void gpio_set_inover(uint gpio, uint value) {
     invalid_params_if(GPIO, gpio >= NUM_BANK0_GPIOS);

src/rp2_common/hardware_gpio/include/hardware/gpio.h

@@ -239,6 +239,16 @@ static inline void gpio_disable_pulls(uint gpio) {
     gpio_set_pulls(gpio, false, false);
 }
 
+/*! \brief Set GPIO IRQ override
+ *  \ingroup hardware_gpio
+ *
+ * Optionally invert a GPIO IRQ signal, or drive it high or low
+ *
+ * \param gpio GPIO number
+ * \param value See \ref gpio_override
+ */
+void gpio_set_irqover(uint gpio, uint value);
+
 /*! \brief Set GPIO output override
  *  \ingroup hardware_gpio
  *