From 972126fd2406030dbd3abd1a705bb0ae1af9abb3 Mon Sep 17 00:00:00 2001
From: Daniel Friesel <derf@finalrewind.org>
Date: Fri, 15 Dec 2017 14:55:27 +0100
Subject: Add AVR (Arduino Nano) support

---
 src/arch/arduino-nano/arch.cc | 58 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 58 insertions(+)
 create mode 100644 src/arch/arduino-nano/arch.cc

(limited to 'src/arch/arduino-nano/arch.cc')

diff --git a/src/arch/arduino-nano/arch.cc b/src/arch/arduino-nano/arch.cc
new file mode 100644
index 0000000..28fe34b
--- /dev/null
+++ b/src/arch/arduino-nano/arch.cc
@@ -0,0 +1,58 @@
+#include "arch.h"
+#include <avr/io.h>
+#include <avr/interrupt.h>
+
+void Arch::setup(void)
+{
+#ifdef TIMER_CYCLES
+	TCCR0A = 0;
+	TCCR0B = _BV(CS00);
+#endif
+
+#if defined(WITH_LOOP) || defined(TIMER_S)
+	TCCR1A = 0;
+	TCCR1B = _BV(WGM12) | _BV(CS12) | _BV(CS10); // /1024
+	OCR1A = 15625;
+	TIMSK1 = _BV(OCIE1A);
+#endif
+
+#ifdef TIMER_US
+	// 16MHz/8 -> 2MHz timer
+	TCCR2A = 0;
+	TCCR2B = _BV(CS21);
+#endif
+	sei();
+}
+
+#if defined(WITH_LOOP) || defined(TIMER_S)
+
+#include "driver/uptime.h"
+extern void loop();
+
+#endif
+
+void Arch::idle_loop(void)
+{
+	while (1) {
+		SMCR = _BV(SE);
+		asm("sleep");
+		SMCR = 0;
+		asm("wdr");
+#ifdef WITH_LOOP
+		loop();
+#endif
+#ifdef TIMER_S
+		uptime.tick_s();
+#endif
+	}
+}
+
+Arch arch;
+
+#if defined(WITH_LOOP) || defined(TIMER_S)
+
+ISR(TIMER1_COMPA_vect)
+{
+}
+
+#endif
-- 
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