3 files changed, 146 insertions, 0 deletions

diff --git a/util/audio_generate_dac_lut.py b/util/audio_generate_dac_lut.py
new file mode 100755
index 000000000..c31ba3d7e
--- /dev/null
+++ b/util/audio_generate_dac_lut.py
@@ -0,0 +1,67 @@
+#!/usr/bin/env python3
+#
+# Copyright 2020 JohSchneider
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+
+AUDIO_DAC_BUFFER_SIZE=256
+AUDIO_DAC_SAMPLE_MAX=4095
+
+def plot(values):
+    for v in values:
+        print('0'* int(v * 80/AUDIO_DAC_SAMPLE_MAX))
+
+def to_lut(values):
+    for v in values:
+        print(hex(int(v)), end=", ")
+
+
+from math import sin, tau, pi
+
+samples=[]
+
+def sampleSine():
+    for s in range(AUDIO_DAC_BUFFER_SIZE):
+        samples.append((sin((s/AUDIO_DAC_BUFFER_SIZE)*tau - pi/2) + 1 )/2* AUDIO_DAC_SAMPLE_MAX)
+
+def sampleTriangle():
+    for s in range(AUDIO_DAC_BUFFER_SIZE):
+        if s < AUDIO_DAC_BUFFER_SIZE/2:
+            samples.append(s/(AUDIO_DAC_BUFFER_SIZE/2) * AUDIO_DAC_SAMPLE_MAX)
+        else:
+            samples.append(AUDIO_DAC_SAMPLE_MAX - (s-AUDIO_DAC_BUFFER_SIZE/2)/(AUDIO_DAC_BUFFER_SIZE/2) * AUDIO_DAC_SAMPLE_MAX)
+
+#compromise between square and triangle wave,
+def sampleTrapezoidal():
+    for i in range(AUDIO_DAC_BUFFER_SIZE):
+        a=3 #slope/inclination
+        if (i < AUDIO_DAC_BUFFER_SIZE/2):
+            s = a * (i * AUDIO_DAC_SAMPLE_MAX/(AUDIO_DAC_BUFFER_SIZE/2)) + (1-a)*AUDIO_DAC_SAMPLE_MAX/2
+        else:
+            i = i - AUDIO_DAC_BUFFER_SIZE/2
+            s = AUDIO_DAC_SAMPLE_MAX - a * (i * AUDIO_DAC_SAMPLE_MAX/(AUDIO_DAC_BUFFER_SIZE/2)) - (1-a)*AUDIO_DAC_SAMPLE_MAX/2
+
+        if s < 0:
+            s=0
+        if s> AUDIO_DAC_SAMPLE_MAX:
+            s=AUDIO_DAC_SAMPLE_MAX
+        samples.append(s)
+
+
+#sampleSine()
+sampleTrapezoidal()
+#print(samples)
+plot(samples)
+to_lut(samples)
diff --git a/util/sample_parser.py b/util/sample_parser.py
new file mode 100755
index 000000000..70e193aee
--- /dev/null
+++ b/util/sample_parser.py
@@ -0,0 +1,39 @@
+#!/usr/bin/env python3
+#
+# Copyright 2019 Jack Humbert
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+
+import wave, struct, sys
+
+waveFile = wave.open(sys.argv[1], 'r')
+# print(str(waveFile.getparams()))
+# sys.exit()
+
+if (waveFile.getsampwidth() != 2):
+    raise(Exception("This script currently only works with 16bit audio files"))
+
+length = waveFile.getnframes()
+out = "#define DAC_SAMPLE_CUSTOM_LENGTH " + str(length) + "\n\n"
+out += "static const dacsample_t dac_sample_custom[" + str(length) + "] = {"
+for i in range(0,length):
+    if (i % 8 == 0):
+        out += "\n    "
+    waveData = waveFile.readframes(1)
+    data = struct.unpack("<h", waveData)
+    out += str(int((int(data[0]) + 0x8000) / 16)) + ", "
+out = out[:-2]
+out += "\n};"
+print(out)
diff --git a/util/wavetable_parser.py b/util/wavetable_parser.py
new file mode 100755
index 000000000..be0f01f7b
--- /dev/null
+++ b/util/wavetable_parser.py
@@ -0,0 +1,40 @@
+#!/usr/bin/env python3
+#
+# Copyright 2019 Jack Humbert
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+
+import wave, struct, sys
+
+waveFile = wave.open(sys.argv[1], 'r')
+
+length = waveFile.getnframes()
+out = "#define DAC_WAVETABLE_CUSTOM_LENGTH " + str(int(length / 256)) + "\n\n"
+out += "static const dacsample_t dac_wavetable_custom[" + str(int(length / 256)) + "][256] = {"
+for i in range(0,length):
+    if (i % 8 == 0):
+        out += "\n    "
+    if (i % 256 == 0):
+        out = out[:-2]
+        out += "{\n    "
+    waveData = waveFile.readframes(1)
+    data = struct.unpack("<h", waveData)
+    out += str(int((int(data[0]) + 0x8000) / 16)) + ", "
+    if (i % 256 == 255):
+        out = out[:-2]
+        out += "\n  },"
+out = out[:-1]
+out += "\n};"
+print(out)