From 7346cfaad4d969db060f3c7ae242ea93f4fff5c0 Mon Sep 17 00:00:00 2001
From: VG <vg@devys.org>
Date: Wed, 26 Aug 2015 18:45:01 +0200
Subject: first commit

---
 powerswitch2/main.c | 39 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)
 create mode 100644 powerswitch2/main.c

(limited to 'powerswitch2/main.c')

diff --git a/powerswitch2/main.c b/powerswitch2/main.c
new file mode 100644
index 0000000..63e5d5c
--- /dev/null
+++ b/powerswitch2/main.c
@@ -0,0 +1,39 @@
+#include <avr/io.h>
+#include <util/delay.h>
+
+static inline void uart_init();
+int main()
+{
+    /* serial */
+    uart_init();
+
+    /* data input */
+    PORTB &= ~0x0F;
+    DDRB  |=  0x0F;
+
+    for (;;)
+    {
+        while ((UCSRA & (1 << RXC)) == 0);
+        PORTB ^= UDR & 0x0F;
+
+        while ((UCSRA & (1 << UDRE)) == 0);
+        UDR = PORTB & 0x0F;
+    }
+
+    return 0;
+}
+
+static inline void uart_init()
+{
+    UCSRB |= (1 << RXEN)  | (1 << TXEN);
+    UCSRC |= (1 << UCSZ0) | (1 << UCSZ1);
+#define BAUD 38400
+#include <util/setbaud.h>
+    UBRRH = UBRRH_VALUE;
+    UBRRL = UBRRL_VALUE;
+#if USE_2X
+    UCSRA |= (1 << U2X);
+#else
+    UCSRA &= ~(1 << U2X);
+#endif
+}
-- 
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