investigate why variable delay is not working

1 files changed, 27 insertions, 24 deletions

diff --git a/main.c b/main.c
index 9f99ce1..461a970 100644
--- a/main.c
+++ b/main.c
@@ -9,6 +9,7 @@
 #include <avr/interrupt.h>
 
 #define F_CPU   16000000UL
+#define __DELAY_BACKWARD_COMPATIBLE__ /* to use variables with _delay_u/ms */
 #include <util/delay.h>
 
 #define P_RX    0
@@ -16,29 +17,29 @@
 #define P_SPKR  2
 
 unsigned short freqs[] = {
-        100,
-        200,
-        250,
-        300,
-        350,
-        400,
-        500,
-        600,
-        700,
-        750,
-        1000,
-        1250,
-        1500,
-        1750,
-        2000,
-        3000,
-        4000,
-        5000,
-        6000,
-        7000,
-        8000
+        1 / 100 * 1e6 / 2,
+        1 / 200 * 1e6 / 2,
+        1 / 250 * 1e6 / 2,
+        1 / 300 * 1e6 / 2,
+        1 / 350 * 1e6 / 2,
+        1 / 400 * 1e6 / 2,
+        1 / 500 * 1e6 / 2,
+        1 / 600 * 1e6 / 2,
+        1 / 700 * 1e6 / 2,
+        1 / 750 * 1e6 / 2,
+        1 / 1000 * 1e6 / 2,
+        1 / 1250 * 1e6 / 2,
+        1 / 1500 * 1e6 / 2,
+        1 / 1750 * 1e6 / 2,
+        1 / 2000 * 1e6 / 2,
+        1 / 3000 * 1e6 / 2,
+        1 / 4000 * 1e6 / 2,
+        1 / 5000 * 1e6 / 2,
+        1 / 6000 * 1e6 / 2,
+        1 / 7000 * 1e6 / 2,
+        1 / 8000 * 1e6 / 2
 };
-unsigned char note = 0;
+unsigned char note = 8;
 unsigned char buttonpressed = 1;
 
 int
@@ -57,8 +58,10 @@ main(void)
 
         //for (;;);
         for (unsigned char n = 0;; n = (n + 1) % 2) {
-                if (!buttonpressed) continue;
-                _delay_us(71.43);
+                if (!buttonpressed && n == 0) continue;
+                _delay_us(freqs[note]);
+//              _delay_us(714.2857);
+//              _delay_us(70);
                 PORTD ^= 1 << P_SPKR;
         }
 }