From 8b0b03e0ee404c321349dd56dc2e07ae8b8cc706 Mon Sep 17 00:00:00 2001
From: Thomas Kolb <cfr34k-git@tkolb.de>
Date: Sat, 18 May 2024 00:08:37 +0200
Subject: [PATCH] buttons: fix state detection

---
 src/buttons.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/buttons.c b/src/buttons.c
index 9c69971..3e03515 100644
--- a/src/buttons.c
+++ b/src/buttons.c
@@ -32,8 +32,8 @@ void buttons_init(void)
 void buttons_update_state(uint32_t time_ms)
 {
 	for(int i = 0; i < NUM_BUTTONS; i++) {
-		bool is_pressed  = gpio_get(m_pins[i]);
-		bool was_pressed = (m_states >> i) != 0;
+		bool is_pressed  = !gpio_get(m_pins[i]); // buttons are active low
+		bool was_pressed = ((m_states >> i) & 0x1) != 0;
 
 		m_events[i] = 0;
 		if(is_pressed && !was_pressed) {