sources from initial AVR turn-on for TeleTerra

[fw/altos] / avr / tthello.c

diff --git a/avr/tthello.c b/avr/tthello.c
new file mode 100644 (file)
index 0000000..68aa6aa
--- /dev/null
+++ b/avr/tthello.c
@@ -0,0 +1,35 @@
+#include <inttypes.h>
+#include <avr/io.h>
+#include <avr/interrupt.h>
+#include <avr/sleep.h>
+
+void wait_until_key_pressed(void)
+{
+    unsigned char temp1, temp2;
+    unsigned int i;
+    
+    do {
+        temp1 = PINC;                  // read input
+        for(i=0;i<65535;i++);
+        temp2 = PINC;                  // read input
+        temp1 = (temp1 & temp2);       // debounce input
+    } while ( temp1 & _BV(PINC4) );
+    
+    loop_until_bit_is_set(PINC,PINC4); /* wait until key is released */
+}
+
+int main (void)
+{
+       // configure to read center press on joy switch
+       DDRC &=~ (1 << PC4);        /* Pin PC4 input              */
+       PORTC |= (1 << PC4);        /* Pin PC4 pull-up enabled    */
+
+       for (;;) {                           /* loop forever */
+               // turn on LCD backlight LED
+               PORTD = 0xff;
+               wait_until_key_pressed();
+               PORTD = 0;
+               wait_until_key_pressed();
+       }
+        return 0;
+}