From 25aa2dd624776f460c7424431b62958f9c524e3d Mon Sep 17 00:00:00 2001
From: David Doan <daviddoan@Davids-MacBook-Pro-193.local>
Date: Thu, 14 Dec 2023 16:34:32 -0500
Subject: utils

---
 Sender.py                        |   3 ++-
 __pycache__/utils.cpython-38.pyc | Bin 0 -> 853 bytes
 utils.py                         |  31 +++++++++++++++++++++++++++++++
 3 files changed, 33 insertions(+), 1 deletion(-)
 create mode 100644 __pycache__/utils.cpython-38.pyc
 create mode 100644 utils.py

diff --git a/Sender.py b/Sender.py
index 7eab893..ca0183e 100644
--- a/Sender.py
+++ b/Sender.py
@@ -1,6 +1,7 @@
 import numpy as np
 import pyaudio
 import threading
+from utils import *
 
 """
 Play a single frequency.
@@ -201,7 +202,7 @@ send_thread = threading.Thread(target=link_layer.send_data)
 # Start the threads
 send_thread.start()
 
-# take in range width, the number of bytes, and the bytes themsleve, and starting freq
+# take in range width, the number of bytes, and the bytes themselves, and starting freq
 
 # cmdline args: data, start freq, bytes per transmit, frequency range
 # 18500, 1000 range 
diff --git a/__pycache__/utils.cpython-38.pyc b/__pycache__/utils.cpython-38.pyc
new file mode 100644
index 0000000..ae3eb9b
Binary files /dev/null and b/__pycache__/utils.cpython-38.pyc differ
diff --git a/utils.py b/utils.py
new file mode 100644
index 0000000..ffa671f
--- /dev/null
+++ b/utils.py
@@ -0,0 +1,31 @@
+
+# given the cmdline arg, turns the byte sequencies into a list of frequencies, and vice versa
+
+# 1875 1924 +24, -25, range/2, 1, flipping new info 2 sending or not
+
+
+def make_frequencies_map(start_freq, freq_step, byte_per_transmit, is_sender=True):
+    freq_list = [None] * (byte_per_transmit + 3)
+    sender_range = freq_step // 2 
+    plus_minus = sender_range // (byte_per_transmit + 3)
+    
+    for i in range(byte_per_transmit + 3):
+        freq_list[i] = start_freq + i * plus_minus
+        if not is_sender:
+            freq_list[i] += sender_range
+
+    return freq_list
+
+
+def frequencies_to_bytes(frequencies, start_freq, freq_step, byte_per_transmit, is_sender=True):
+    freq_list = make_frequencies_map(start_freq, freq_step, byte_per_transmit, is_sender)
+    byte_list = [None] * len(frequencies)
+
+    sender_range = freq_step // 2 
+    plus_minus = sender_range // (byte_per_transmit + 3)
+
+    for i in range(len(frequencies)):
+        byte_list[i] = 0
+        if frequencies[i] <= freq_list[i] < frequencies[i] + plus_minus - 1: byte_list[i] = 1
+
+    return byte_list
\ No newline at end of file
-- 
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