atmega2560: add stdin driver

1 files changed, 35 insertions, 0 deletions

diff --git a/src/arch/atmega2560/driver/stdin.cc b/src/arch/atmega2560/driver/stdin.cc
new file mode 100644
index 0000000..213b29e
--- /dev/null
+++ b/src/arch/atmega2560/driver/stdin.cc
@@ -0,0 +1,35 @@
+/*
+ * Copyright 2020 Daniel Friesel
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+#include "driver/stdin.h"
+#include <avr/io.h>
+#include <avr/interrupt.h>
+
+void StandardInput::setup()
+{
+	UCSR0B |= _BV(RXCIE0);
+}
+
+bool StandardInput::hasKey()
+{
+	if (write_pos != read_pos) {
+		return true;
+	}
+	return false;
+}
+
+char StandardInput::getKey()
+{
+	char ret = buffer[read_pos++];
+	read_pos %= bufsize;
+	return ret;
+}
+
+StandardInput kin;
+
+ISR(USART0_RX_vect)
+{
+	kin.addKey(UDR0);
+}