From a40ea0981fb6818641f7212ace9473b8600c6c29 Mon Sep 17 00:00:00 2001
From: Xoaquin Castrelo <xoaquin.cb@gmail.com>
Date: Sun, 14 Nov 2021 04:39:25 +0000
Subject: [PATCH] Added support for buttons.
---
emb/buttons.cpp | 43 +++++++++++++++++++++++++++++++++++++++++++
emb/buttons.hpp | 15 +++++++++++++++
2 files changed, 58 insertions(+)
create mode 100644 emb/buttons.cpp
create mode 100644 emb/buttons.hpp
diff --git a/emb/buttons.cpp b/emb/buttons.cpp
new file mode 100644
index 0000000..7fc1fbd
--- /dev/null
+++ b/emb/buttons.cpp
@@ -0,0 +1,43 @@
+#include "buttons.hpp"
+#include "uart.hpp"
+#include "time.hpp"
+#include <avr/io.h>
+
+static bool lastStateA = false;
+static bool lastStateB = false;
+static uint32_t lastMillisA = 0;
+static uint32_t lastMillisB = 0;
+
+void initButtons()
+{
+ DDRC &= ~(1 << DDC5) & ~(1 << DDC4); // set PC5 and PC4 as inputs
+ PORTC |= (1 << PORTC5) | (1 << PORTC4); // enable pullups
+}
+
+void updateButtons()
+{
+ uint32_t currMillis = getCurrentMillis();
+
+ bool currStateA = (PINC & (1 << PINC5));
+ bool currStateB = (PINC & (1 << PINC4));
+
+ if (currStateA != lastStateA)
+ {
+ lastStateA = currStateA;
+
+ if (!currStateA && (currMillis - lastMillisA) > 50)
+ writeUart('a');
+
+ lastMillisA = currMillis;
+ }
+
+ if (currStateB != lastStateB)
+ {
+ lastStateB = currStateB;
+
+ if (!currStateB && (currMillis - lastMillisB) > 50)
+ writeUart('b');
+
+ lastMillisB = currMillis;
+ }
+}
diff --git a/emb/buttons.hpp b/emb/buttons.hpp
new file mode 100644
index 0000000..e4f6fcb
--- /dev/null
+++ b/emb/buttons.hpp
@@ -0,0 +1,15 @@
+#ifndef BUTTONS_H
+#define BUTTONS_H
+
+/**
+ * Initialises the button logic.
+ */
+void initButtons();
+
+/**
+ * Updates the button logic.
+ * Should be called periodically.
+ */
+void updateButtons();
+
+#endif /* BUTTONS_H */
--
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