eel4746_avr_piano

commit 9d751dc020b43f32b1cd7e5216f4d8de0208dda0
parent fc85413fa9891c32b4d82cd7d0e27fd04220be91
Author: Vineet K <git@vineetk.net>
Date:   Mon, 15 Apr 2024 22:38:55 -0400

investigate why variable delay is not working

Diffstat:
M
main.c
 | 
51
+++++++++++++++++++++++++++------------------------

1 file changed, 27 insertions(+), 24 deletions(-)
diff --git 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;
 	}
 }