1 files changed, 25 insertions, 0 deletions
diff --git a/serial/main.c b/serial/main.c
new file mode 100644
index 0000000..2e9ff5c
--- /dev/null
+++ b/serial/main.c
@@ -0,0 +1,25 @@
+#include <avr/io.h>
+#include "uart.h"
+
+int main(void)
+{
+    /* serial */
+    uart_init();
+
+    /* D4 = output and high (=> atx down) */
+    PORTD |= 0x10;
+    DDRD  |= 0x10;
+
+    for (;;)
+    {
+        switch(uart_getchar()) {
+            case '?': break; /* useful for auto documentation */
+            case '0': PORTD |=  0x10; break;
+            case '1': PORTD &= ~0x10; break;
+            case 'T': PORTD ^=  0x10; break;
+        }
+        uart_putchar((PORTD & 0x10) ? '0' : '1');
+    }
+
+    return 0;
+}