first commit of proof of concept with CV control of pitch

Author: doctea

generate_frequency_table.py

@@ -0,0 +1,46 @@
+#!/usr/bin/python3
+
+# A440 = midi note 69
+
+MIDI_BASE_NOTE = 69 - 12
+
+BASEFREQ = 440             # This is the Hz for the standard A note.
+NOTE = 0	                # This is the note relative to the standard A. 0 = standard A itself, -1 = G# etc. 
+STEPS_PER_OCTAVE = 12	    #Normally we use 12 notes per octave.
+
+PAL_PHI = 985248
+NTSC_PHI = 1022727 #//This is for machines with 6567R8 VIC. 6567R56A is slightly different.
+
+#CONSTANT = round(pow(256,3) / NTSC_PHI,2)  # //Select the constant appropriate for your machine (PAL vs NTSC).
+CONSTANT = pow(256,3) / PAL_PHI  # //Select the constant appropriate for your machine (PAL vs NTSC).
+
+print("// MIDI_BASE_NOTE of %s" % MIDI_BASE_NOTE)
+print("// BASEFREQ of %s" % BASEFREQ)
+print("// using PAL_PHI of %s" % 985248)
+print("// constant is %s" % CONSTANT)
+
+print("double sidinote[] = {")
+
+for i in range(0,127):
+    #print("// for midi note %s" % i, end='\t')
+
+    # ok so first midi note is MIDI_BASE_NOTE - 69
+    # so when i = 0 note should be -69
+    # when i = 1 note should be -68
+
+    note = i - MIDI_BASE_NOTE
+
+    FREQ_HZ = BASEFREQ * pow(2,note/STEPS_PER_OCTAVE)
+
+    #print("// freq_hz is %s" % FREQ_HZ, end='\t')
+
+    """SID_FREQ = round(CONSTANT * FREQ_HZ) # //Calculate SID freq for a certain note (specified in Hz).
+
+    if (SID_FREQ > pow(2,16)):
+        break
+    #print("// so SID value is %s" % SID_FREQ)
+    print ("\t%s, // note %s freq %s" % (SID_FREQ, i, FREQ_HZ))"""
+
+    print ("\t%s, // note %s freq %s" % (FREQ_HZ, i, FREQ_HZ))
+
+print("};")

include/README

@@ -0,0 +1,39 @@
+
+This directory is intended for project header files.
+
+A header file is a file containing C declarations and macro definitions
+to be shared between several project source files. You request the use of a
+header file in your project source file (C, C++, etc) located in `src` folder
+by including it, with the C preprocessing directive `#include'.
+
+```src/main.c
+
+#include "header.h"
+
+int main (void)
+{
+ ...
+}
+```
+
+Including a header file produces the same results as copying the header file
+into each source file that needs it. Such copying would be time-consuming
+and error-prone. With a header file, the related declarations appear
+in only one place. If they need to be changed, they can be changed in one
+place, and programs that include the header file will automatically use the
+new version when next recompiled. The header file eliminates the labor of
+finding and changing all the copies as well as the risk that a failure to
+find one copy will result in inconsistencies within a program.
+
+In C, the usual convention is to give header files names that end with `.h'.
+It is most portable to use only letters, digits, dashes, and underscores in
+header file names, and at most one dot.
+
+Read more about using header files in official GCC documentation:
+
+* Include Syntax
+* Include Operation
+* Once-Only Headers
+* Computed Includes
+
+https://gcc.gnu.org/onlinedocs/cpp/Header-Files.html

include/ads.h

@@ -0,0 +1,11 @@
+#include "ADS1X15.h"
+
+extern ADS1115 ADS;
+
+void setup_ads();
+
+int read_value(int channel);
+float read_voltage(int channel);
+double get_frequency_for_pitch(int pitch);
+int get_midi_pitch_for_voltage(float voltageFromAdc, int pitch_offset = 24);
+double get_frequency_for_voltage(float voltageFromAdc, int pitch_offset = 24);

include/myfreqs.h

@@ -0,0 +1,133 @@
+// MIDI_BASE_NOTE of 57
+// BASEFREQ of 440
+// using PAL_PHI of 985248
+// constant is 17.02841924063789
+double sidinote[] = {
+	16.351597831287414, // note 0 freq 16.351597831287414
+	17.323914436054505, // note 1 freq 17.323914436054505
+	18.354047994837977, // note 2 freq 18.354047994837977
+	19.445436482630058, // note 3 freq 19.445436482630058
+	20.601722307054366, // note 4 freq 20.601722307054366
+	21.826764464562746, // note 5 freq 21.826764464562746
+	23.12465141947715, // note 6 freq 23.12465141947715
+	24.499714748859326, // note 7 freq 24.499714748859326
+	25.956543598746574, // note 8 freq 25.956543598746574
+	27.5, // note 9 freq 27.5
+	29.13523509488062, // note 10 freq 29.13523509488062
+	30.86770632850775, // note 11 freq 30.86770632850775
+	32.70319566257483, // note 12 freq 32.70319566257483
+	34.64782887210901, // note 13 freq 34.64782887210901
+	36.70809598967594, // note 14 freq 36.70809598967594
+	38.890872965260115, // note 15 freq 38.890872965260115
+	41.20344461410875, // note 16 freq 41.20344461410875
+	43.653528929125486, // note 17 freq 43.653528929125486
+	46.2493028389543, // note 18 freq 46.2493028389543
+	48.999429497718666, // note 19 freq 48.999429497718666
+	51.91308719749314, // note 20 freq 51.91308719749314
+	55.0, // note 21 freq 55.0
+	58.27047018976124, // note 22 freq 58.27047018976124
+	61.7354126570155, // note 23 freq 61.7354126570155
+	65.40639132514966, // note 24 freq 65.40639132514966
+	69.29565774421802, // note 25 freq 69.29565774421802
+	73.41619197935188, // note 26 freq 73.41619197935188
+	77.78174593052023, // note 27 freq 77.78174593052023
+	82.4068892282175, // note 28 freq 82.4068892282175
+	87.30705785825097, // note 29 freq 87.30705785825097
+	92.4986056779086, // note 30 freq 92.4986056779086
+	97.99885899543733, // note 31 freq 97.99885899543733
+	103.82617439498628, // note 32 freq 103.82617439498628
+	110.0, // note 33 freq 110.0
+	116.54094037952248, // note 34 freq 116.54094037952248
+	123.47082531403103, // note 35 freq 123.47082531403103
+	130.8127826502993, // note 36 freq 130.8127826502993
+	138.59131548843604, // note 37 freq 138.59131548843604
+	146.8323839587038, // note 38 freq 146.8323839587038
+	155.56349186104046, // note 39 freq 155.56349186104046
+	164.81377845643496, // note 40 freq 164.81377845643496
+	174.61411571650194, // note 41 freq 174.61411571650194
+	184.9972113558172, // note 42 freq 184.9972113558172
+	195.99771799087463, // note 43 freq 195.99771799087463
+	207.65234878997256, // note 44 freq 207.65234878997256
+	220.0, // note 45 freq 220.0
+	233.08188075904496, // note 46 freq 233.08188075904496
+	246.94165062806206, // note 47 freq 246.94165062806206
+	261.6255653005986, // note 48 freq 261.6255653005986
+	277.1826309768721, // note 49 freq 277.1826309768721
+	293.6647679174076, // note 50 freq 293.6647679174076
+	311.1269837220809, // note 51 freq 311.1269837220809
+	329.6275569128699, // note 52 freq 329.6275569128699
+	349.2282314330039, // note 53 freq 349.2282314330039
+	369.9944227116344, // note 54 freq 369.9944227116344
+	391.99543598174927, // note 55 freq 391.99543598174927
+	415.3046975799451, // note 56 freq 415.3046975799451
+	440.0, // note 57 freq 440.0
+	466.1637615180899, // note 58 freq 466.1637615180899
+	493.8833012561241, // note 59 freq 493.8833012561241
+	523.2511306011972, // note 60 freq 523.2511306011972
+	554.3652619537442, // note 61 freq 554.3652619537442
+	587.3295358348151, // note 62 freq 587.3295358348151
+	622.2539674441618, // note 63 freq 622.2539674441618
+	659.2551138257398, // note 64 freq 659.2551138257398
+	698.4564628660078, // note 65 freq 698.4564628660078
+	739.9888454232688, // note 66 freq 739.9888454232688
+	783.9908719634985, // note 67 freq 783.9908719634985
+	830.6093951598903, // note 68 freq 830.6093951598903
+	880.0, // note 69 freq 880.0
+	932.3275230361799, // note 70 freq 932.3275230361799
+	987.7666025122483, // note 71 freq 987.7666025122483
+	1046.5022612023945, // note 72 freq 1046.5022612023945
+	1108.7305239074883, // note 73 freq 1108.7305239074883
+	1174.6590716696303, // note 74 freq 1174.6590716696303
+	1244.5079348883237, // note 75 freq 1244.5079348883237
+	1318.5102276514797, // note 76 freq 1318.5102276514797
+	1396.9129257320155, // note 77 freq 1396.9129257320155
+	1479.9776908465376, // note 78 freq 1479.9776908465376
+	1567.981743926997, // note 79 freq 1567.981743926997
+	1661.2187903197805, // note 80 freq 1661.2187903197805
+	1760.0, // note 81 freq 1760.0
+	1864.6550460723597, // note 82 freq 1864.6550460723597
+	1975.533205024496, // note 83 freq 1975.533205024496
+	2093.004522404789, // note 84 freq 2093.004522404789
+	2217.4610478149766, // note 85 freq 2217.4610478149766
+	2349.31814333926, // note 86 freq 2349.31814333926
+	2489.0158697766474, // note 87 freq 2489.0158697766474
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+	2793.825851464031, // note 89 freq 2793.825851464031
+	2959.955381693075, // note 90 freq 2959.955381693075
+	3135.9634878539946, // note 91 freq 3135.9634878539946
+	3322.437580639561, // note 92 freq 3322.437580639561
+	3520.0, // note 93 freq 3520.0
+	3729.3100921447194, // note 94 freq 3729.3100921447194
+	3951.066410048992, // note 95 freq 3951.066410048992
+	4186.009044809578, // note 96 freq 4186.009044809578
+	4434.922095629953, // note 97 freq 4434.922095629953
+	4698.63628667852, // note 98 freq 4698.63628667852
+	4978.031739553295, // note 99 freq 4978.031739553295
+	5274.04091060592, // note 100 freq 5274.04091060592
+	5587.651702928062, // note 101 freq 5587.651702928062
+	5919.91076338615, // note 102 freq 5919.91076338615
+	6271.926975707989, // note 103 freq 6271.926975707989
+	6644.875161279122, // note 104 freq 6644.875161279122
+	7040.0, // note 105 freq 7040.0
+	7458.620184289437, // note 106 freq 7458.620184289437
+	7902.132820097988, // note 107 freq 7902.132820097988
+	8372.018089619156, // note 108 freq 8372.018089619156
+	8869.844191259906, // note 109 freq 8869.844191259906
+	9397.272573357044, // note 110 freq 9397.272573357044
+	9956.06347910659, // note 111 freq 9956.06347910659
+	10548.081821211836, // note 112 freq 10548.081821211836
+	11175.303405856126, // note 113 freq 11175.303405856126
+	11839.8215267723, // note 114 freq 11839.8215267723
+	12543.853951415975, // note 115 freq 12543.853951415975
+	13289.750322558246, // note 116 freq 13289.750322558246
+	14080.0, // note 117 freq 14080.0
+	14917.240368578874, // note 118 freq 14917.240368578874
+	15804.265640195976, // note 119 freq 15804.265640195976
+	16744.036179238312, // note 120 freq 16744.036179238312
+	17739.688382519813, // note 121 freq 17739.688382519813
+	18794.54514671409, // note 122 freq 18794.54514671409
+	19912.12695821318, // note 123 freq 19912.12695821318
+	21096.16364242367, // note 124 freq 21096.16364242367
+	22350.606811712252, // note 125 freq 22350.606811712252
+	23679.6430535446, // note 126 freq 23679.6430535446
+};