1 files changed, 49 insertions, 0 deletions
diff --git a/buttons.c b/buttons.c
new file mode 100644
index 0000000..2e9996b
--- /dev/null
+++ b/buttons.c
@@ -0,0 +1,49 @@
+#include <stdio.h>
+#include "pico/stdlib.h"
+
+#include "buttons.h"
+extern int app_btnpressed(int app_id, uint gpio);
+extern int current_app;
+
+// Debounce control
+// See https://www.raspberrypi.org/forums/viewtopic.php?f=145&t=301522#p1812063
+// time is currently shared between all buttons.
+unsigned long button_time;
+const int button_delayTime = 50; // 50ms worked fine for me .... change it to your needs/specs.
+
+//const uint BUTTON_PINS[] = {BUTTON_HOME, BUTTON_SELECT, BUTTON_MODE, BUTTON_UP, BUTTON_DOWN};
+
+void gpio_interrupt_cb(uint gpio, uint32_t events) {
+    if ((to_ms_since_boot(get_absolute_time())-button_time)>button_delayTime) {
+        app_btnpressed(current_app, gpio);
+        button_time = to_ms_since_boot(get_absolute_time());
+    }
+}
+
+void init_buttons() {
+    gpio_init(BUTTON_HOME);
+    gpio_pull_up(BUTTON_HOME);
+    gpio_set_irq_enabled_with_callback(BUTTON_HOME, GPIO_IRQ_EDGE_FALL , true, &gpio_interrupt_cb);
+    gpio_init(BUTTON_SELECT);
+    gpio_pull_up(BUTTON_SELECT);
+    gpio_set_irq_enabled_with_callback(BUTTON_SELECT, GPIO_IRQ_EDGE_FALL , true, &gpio_interrupt_cb);
+    gpio_init(BUTTON_MODE);
+    gpio_pull_up(BUTTON_MODE);
+    gpio_set_irq_enabled_with_callback(BUTTON_MODE, GPIO_IRQ_EDGE_FALL , true, &gpio_interrupt_cb);
+    gpio_init(BUTTON_DOWN);
+    gpio_pull_up(BUTTON_DOWN);
+    gpio_set_irq_enabled_with_callback(BUTTON_DOWN, GPIO_IRQ_EDGE_FALL , true, &gpio_interrupt_cb);
+    gpio_init(BUTTON_UP);
+    gpio_pull_up(BUTTON_UP);
+    gpio_set_irq_enabled_with_callback(BUTTON_UP, GPIO_IRQ_EDGE_FALL , true, &gpio_interrupt_cb);
+
+    /* For some reason for loop does not work… TODO
+    for (int i=0; i == NUMBER_OF_BUTTONS; i++) {
+        uint button = BUTTON_PINS[i];
+        gpio_init(button);
+        gpio_pull_up(button);
+        gpio_set_irq_enabled_with_callback(button, GPIO_IRQ_EDGE_FALL , true, &gpio_interrupt_cb);
+    }
+    */
+    button_time = to_ms_since_boot(get_absolute_time());
+}