From 34f3aa9e3643ba44bfd2f7f595f6e33bc8e5b04b Mon Sep 17 00:00:00 2001
From: twobit <twobit@lavabit.com>
Date: Mon, 6 Aug 2012 15:40:09 +0200
Subject: [PATCH] frequency table

---
 firmware/freq_table.h    | 102 +++++++++++++++++++++++++++++++++++++++
 synth/freq_table.h       |   1 +
 synth/make_freq_table.py |  10 ++++
 3 files changed, 113 insertions(+)
 create mode 100644 firmware/freq_table.h
 create mode 120000 synth/freq_table.h
 create mode 100644 synth/make_freq_table.py

diff --git a/firmware/freq_table.h b/firmware/freq_table.h
new file mode 100644
index 0000000..e938d8a
--- /dev/null
+++ b/firmware/freq_table.h
@@ -0,0 +1,102 @@
+const uint16_t freq_table[] = {
+/*0x00*/	39,
+/*0x01*/	41,
+/*0x02*/	43,
+/*0x03*/	46,
+/*0x04*/	49,
+/*0x05*/	51,
+/*0x06*/	54,
+/*0x07*/	58,
+/*0x08*/	61,
+/*0x09*/	65,
+/*0x0a*/	69,
+/*0x0b*/	73,
+/*0x0c*/	77,
+/*0x0d*/	82,
+/*0x0e*/	87,
+/*0x0f*/	92,
+/*0x10*/	97,
+/*0x11*/	103,
+/*0x12*/	109,
+/*0x13*/	115,
+/*0x14*/	122,
+/*0x15*/	130,
+/*0x16*/	137,
+/*0x17*/	145,
+/*0x18*/	154,
+/*0x19*/	163,
+/*0x1a*/	173,
+/*0x1b*/	183,
+/*0x1c*/	194,
+/*0x1d*/	206,
+/*0x1e*/	218,
+/*0x1f*/	231,
+/*0x20*/	245,
+/*0x21*/	259,
+/*0x22*/	275,
+/*0x23*/	291,
+/*0x24*/	308,
+/*0x25*/	327,
+/*0x26*/	346,
+/*0x27*/	367,
+/*0x28*/	388,
+/*0x29*/	412,
+/*0x2a*/	436,
+/*0x2b*/	462,
+/*0x2c*/	489,
+/*0x2d*/	518,
+/*0x2e*/	549,
+/*0x2f*/	582,
+/*0x30*/	617,
+/*0x31*/	653,
+/*0x32*/	692,
+/*0x33*/	733,
+/*0x34*/	777,
+/*0x35*/	823,
+/*0x36*/	872,
+/*0x37*/	924,
+/*0x38*/	979,
+/*0x39*/	1037,
+/*0x3a*/	1099,
+/*0x3b*/	1164,
+/*0x3c*/	1233,
+/*0x3d*/	1306,
+/*0x3e*/	1384,
+/*0x3f*/	1466,
+/*0x40*/	1554,
+/*0x41*/	1646,
+/*0x42*/	1744,
+/*0x43*/	1848,
+/*0x44*/	1957,
+/*0x45*/	2074,
+/*0x46*/	2197,
+/*0x47*/	2328,
+/*0x48*/	2466,
+/*0x49*/	2613,
+/*0x4a*/	2768,
+/*0x4b*/	2933,
+/*0x4c*/	3107,
+/*0x4d*/	3292,
+/*0x4e*/	3488,
+/*0x4f*/	3695,
+/*0x50*/	3915,
+/*0x51*/	4148,
+/*0x52*/	4394,
+/*0x53*/	4656,
+/*0x54*/	4933,
+/*0x55*/	5226,
+/*0x56*/	5537,
+/*0x57*/	5866,
+/*0x58*/	6215,
+/*0x59*/	6584,
+/*0x5a*/	6976,
+/*0x5b*/	7390,
+/*0x5c*/	7830,
+/*0x5d*/	8295,
+/*0x5e*/	8789,
+/*0x5f*/	9311,
+/*0x60*/	9865,
+/*0x61*/	10452,
+/*0x62*/	11073,
+/*0x63*/	11732,
+};
diff --git a/synth/freq_table.h b/synth/freq_table.h
new file mode 120000
index 0000000..7dad7c1
--- /dev/null
+++ b/synth/freq_table.h
@@ -0,0 +1 @@
+../firmware/freq_table.h
\ No newline at end of file
diff --git a/synth/make_freq_table.py b/synth/make_freq_table.py
new file mode 100644
index 0000000..3fe4627
--- /dev/null
+++ b/synth/make_freq_table.py
@@ -0,0 +1,10 @@
+rate = 8000000 / (3 * 64)
+offset = 50
+
+print "const uint16_t freq_table[] = {"
+
+for i in range(100):
+	n = int(440.0 / rate * 2 ** ((i - offset) / 12.0) * 2 ** 16 + 0.5)
+	if n < 0x10000 / 2:
+		print "/*0x%02x*/\t%d," % (i, n)
+print "};"