Initial commit

2021-10-10 11:39:32 -05:00
commit 01d85538bb
14 changed files with 2691 additions and 0 deletions
--- a/.gitattributes
+++ b/.gitattributes
@@ -0,0 +1,2 @@
+# Auto detect text files and perform LF normalization
+* text=auto
--- a/.gitignore
+++ b/.gitignore
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+.pio
+.vscode/.browse.c_cpp.db*
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--- a/.vscode/extensions.json
+++ b/.vscode/extensions.json
@@ -0,0 +1,7 @@
+{
+    // See http://go.microsoft.com/fwlink/?LinkId=827846
+    // for the documentation about the extensions.json format
+    "recommendations": [
+        "platformio.platformio-ide"
+    ]
+}
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--- a/Converter.xlsx
+++ b/Converter.xlsx
--- a/include/README
+++ b/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
--- a/lib/README
+++ b/lib/README
@@ -0,0 +1,46 @@
+
+This directory is intended for project specific (private) libraries.
+PlatformIO will compile them to static libraries and link into executable file.
+
+The source code of each library should be placed in a an own separate directory
+("lib/your_library_name/[here are source files]").
+
+For example, see a structure of the following two libraries `Foo` and `Bar`:
+
+|--lib
+|  |
+|  |--Bar
+|  |  |--docs
+|  |  |--examples
+|  |  |--src
+|  |     |- Bar.c
+|  |     |- Bar.h
+|  |  |- library.json (optional, custom build options, etc) https://docs.platformio.org/page/librarymanager/config.html
+|  |
+|  |--Foo
+|  |  |- Foo.c
+|  |  |- Foo.h
+|  |
+|  |- README --> THIS FILE
+|
+|- platformio.ini
+|--src
+   |- main.c
+
+and a contents of `src/main.c`:
+```
+#include <Foo.h>
+#include <Bar.h>
+
+int main (void)
+{
+  ...
+}
+
+```
+
+PlatformIO Library Dependency Finder will find automatically dependent
+libraries scanning project source files.
+
+More information about PlatformIO Library Dependency Finder
+- https://docs.platformio.org/page/librarymanager/ldf.html
--- a/platformio.ini
+++ b/platformio.ini
@@ -0,0 +1,18 @@
+; PlatformIO Project Configuration File
+;
+;   Build options: build flags, source filter
+;   Upload options: custom upload port, speed and extra flags
+;   Library options: dependencies, extra library storages
+;   Advanced options: extra scripting
+;
+; Please visit documentation for the other options and examples
+; https://docs.platformio.org/page/projectconf.html
+
+[env:due]
+platform = atmelsam
+board = due
+framework = arduino
+monitor_speed = 115200
+lib_deps = 
+	paulstoffregen/Encoder@^1.4.1
+	C:\Users\Quinn\.platformio\lib\LiquidCrystal_I2C
--- a/sinewave_waveform.awv
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@@ -0,0 +1,600 @@
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--- a/src/main.cpp
+++ b/src/main.cpp
@@ -0,0 +1,163 @@
+/*
+* Code Written by Quinn Henthorne: quinn.henthorne@gmail.com
+* 10/7/2021
+*
+* Pinout List
+* Dac0 - Waveform output
+* Dac1 - Amplitude output
+* D2 - Synch Pin Output (For debugging purposes)
+* D22 - Ampltidue Encoder Input
+* D23 - Amplitude Encoder Input
+* D24 - Period Encoder Input
+* D25 - Period Encoder Input
+* D26 - Waveform Select Encoder
+* D27 - Waveform Select Encoder
+*/
+
+
+#include <Arduino.h>
+#include <Encoder.h>
+#include <Wire.h>
+#include <LiquidCrystal_I2C.h>
+//#include <LiquidTWI2.h>
+
+//uncomment to enable serial output for debugging
+#define enable_serial_debug
+
+#define waveform_pin DAC0
+#define amplitude_pin DAC1
+#define sync_pin 2
+
+// Number of waveforms available
+#define waveform_num 4
+// Array of waveform arrays. Currently holds four waveforms with 600 samples each.
+int waveforms[waveform_num][600] = {
+  {2083,2075,2067,2059,2071,2086,2100,2115,2129,2135,2141,2147,2153,2176,2176,2176,2176,2188,2201,2215,2228,2242,2255,2269,2282,2294,2305,2340,2352,2363,2376,2389,2401,2414,2427,2440,2453,2466,2478,2491,2504,2522,2539,2557,2574,2586,2597,2609,2621,2633,2644,2656,2668,2679,2691,2703,2714,2726,2738,2749,2761,2777,2792,2808,2820,2831,2843,2855,2867,2878,2890,2902,2960,2972,2984,2996,3007,3019,3030,3042,3053,3065,3078,3092,3105,3118,3131,3145,3158,3171,3181,3192,3202,3212,3223,3233,3243,3254,3264,3288,3294,3299,3314,3329,3343,3358,3364,3370,3393,3405,3417,3428,3440,3440,3452,3463,3463,3463,3463,3472,3481,3489,3498,3498,3498,3498,3498,3498,3510,3522,3522,3522,3522,3522,3522,3522,3522,3522,3522,3522,3522,3522,3522,3522,3522,3522,3522,3522,3522,3516,3510,3510,3498,3493,3487,3475,3471,3467,3463,3451,3440,3428,3416,3408,3401,3358,3346,3323,3288,3276,3253,3229,3218,3195,3171,3148,3124,3083,3042,3025,3007,2978,2948,2931,2913,2872,2831,2750,2668,2645,2621,2586,2551,2480,2445,2328,2270,2247,2223,2184,2145,1989,1954,1931,1872,1866,1860,1849,1837,1802,1785,1767,1747,1728,1708,1673,1650,1626,1609,1591,1568,1533,1521,1474,1462,1451,1439,1381,1346,1310,1264,1229,1205,1176,1147,1135,1112,1088,1077,1065,1048,1030,983,966,948,928,909,889,866,849,831,819,808,796,784,761,749,714,702,691,679,667,655,650,644,626,608,597,591,585,574,562,550,539,503,492,480,468,456,445,433,433,433,433,433,421,421,418,416,413,410,410,410,410,407,404,401,398,398,398,398,398,398,398,398,398,398,398,404,410,415,421,425,429,433,439,445,451,456,458,461,463,466,468,476,483,491,496,501,505,510,515,523,530,538,544,550,556,562,574,585,587,590,592,595,597,609,620,623,626,629,632,638,644,644,655,661,667,673,679,687,694,702,720,737,755,772,796,819,843,866,892,919,945,971,1030,1053,1123,1147,1178,1209,1240,1310,1345,1381,1416,1445,1474,1509,1544,1580,1603,1619,1634,1650,1685,1720,1767,1872,1884,1895,1907,1942,1954,1966,2012,2030,2048,2129,2188,2258,2293,2352,2434,2463,2492,2609,2656,2726,2734,2742,2750,2820,2837,2854,2871,2888,2904,2921,2938,2955,2972,2996,3019,3048,3077,3083,3089,3101,3147,3159,3171,3183,3218,3230,3241,3288,3311,3319,3327,3335,3381,3399,3416,3440,3452,3463,3463,3463,3475,3475,3475,3487,3491,3494,3498,3498,3498,3498,3498,3498,3498,3498,3502,3506,3510,3510,3510,3510,3510,3510,3510,3510,3510,3510,3510,3510,3510,3510,3487,3487,3485,3482,3480,3477,3475,3463,3459,3456,3452,3446,3440,3432,3424,3416,3411,3405,3399,3393,3370,3346,3342,3339,3335,3323,3311,3299,3299,3299,3264,3259,3253,3247,3241,3235,3229,3218,3206,3200,3194,3188,3182,3177,3171,3163,3155,3147,3136,3112,3101,3089,3074,3060,3045,3030,2995,2990,2984,2972,2960,2948,2925,2919,2913,2890,2885,2881,2876,2872,2867,2861,2855,2831,2820,2808,2802,2796,2787,2779,2770,2761,2745,2730,2691,2679,2656,2650,2597,2574,2551,2528,2399,2393,2387,2375,2363,2352,2340,2328,2305,2282,2278,2274,2270,2258,2247,2235,2223,2212,2200,
+  },
+  {2083,2090,2097,2104,2111,2118,2118,2118,2118,2118,2118,2118,2118,2118,2118,2118,2118,2118,2118,2118,2118,2118,2118,2118,2118,2118,2118,2118,2118,2118,2118,2118,2118,2118,2118,2118,2118,2118,2120,2122,2125,2127,2129,2129,2129,2129,2129,2129,2129,2129,2129,2129,2129,2129,2129,2129,2129,2129,2129,2129,2129,2129,2129,2129,2129,2129,2129,2129,2129,2129,2131,2134,2136,2139,2141,2146,2151,2155,2160,2165,2168,2171,2173,2176,2185,2194,2202,2211,2211,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,2831,281,234,12,12,12,12,12,12,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,2,3,5,6,8,9,11,12,14,16,19,21,23,25,28,30,33,35,35,35,35,35,35,35,35,35,35,29,23,23,23,23,23,23,23,23,23,23,23,18,14,9,5,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,23,59,94,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,4095,2083,2083,2083,2083,2083,2083,2083,2083,2083,2083,
+  },
+  {1637,1637,1637,4095,4086,4078,4069,4061,4052,4044,4035,4027,4018,4010,4001,3993,3985,3977,3968,3960,3952,3944,3936,3928,3920,3912,3903,3896,3888,3880,3872,3864,3856,3848,3840,3833,3825,3817,3810,3802,3794,3787,3779,3772,3764,3757,3749,3742,3734,3727,3720,3712,3705,3698,3690,3683,3676,3669,3662,3655,3647,3640,3633,3626,3619,3612,3605,3598,3591,3585,3578,3571,3564,3557,3551,3544,3537,3530,3524,3517,3510,3504,3497,3491,3484,3478,3471,3465,3458,3452,3446,3439,3433,3427,3420,3414,3408,3401,3395,3389,3383,3377,3371,3365,3358,3352,3346,3340,3334,3328,3322,3316,3311,3305,3299,3293,3287,3281,3276,3270,3264,3258,3253,3247,3241,3236,3230,3224,3219,3213,3208,3202,3197,3191,3186,3180,3175,3169,3164,3159,3153,3148,3143,3137,3132,3127,3121,3116,3111,3106,3101,3096,3090,3085,3080,3075,3070,3065,3060,3055,3050,3045,3040,3035,3030,3025,3020,3016,3011,3006,3001,2996,2991,2987,2982,2977,2972,2968,2963,2958,2954,2949,2945,2940,2935,2931,2926,2922,2917,2913,2908,2904,2899,2895,2890,2886,2882,2877,2873,2868,2864,2860,2855,2851,2847,2843,2838,2834,2830,2826,2822,2817,2813,2809,2805,2801,2797,2793,2789,2785,2781,2777,2773,2769,2765,2761,2757,2753,2749,2745,2741,2737,2733,2729,2725,2722,2718,2714,2710,2706,2703,2699,2695,2691,2688,2684,2680,2677,2673,2669,2666,2662,2659,2655,2651,2648,2644,2641,2637,2634,2630,2627,2623,2620,2616,2613,2609,2606,2603,2599,2596,2592,2589,2586,2582,2579,2576,2572,2569,2566,2563,2559,2556,2553,2550,2546,2543,1637,1637,1637,1637,1637,1637,1637,1637,1637,1637,1637,1637,1637,1637,1637,1637,1637,1637,1637,1637,1637,1637,1637,1637,1637,1637,1637,1637,0,6,12,17,23,29,34,40,46,51,57,62,68,73,79,84,90,95,101,106,112,117,122,128,133,138,143,149,154,159,164,170,175,180,185,190,195,200,205,210,215,220,225,230,235,240,245,250,255,260,265,270,274,279,284,289,294,298,303,308,312,317,322,326,331,336,340,345,349,354,358,363,367,372,376,381,385,389,394,398,403,407,411,416,420,424,428,433,437,441,445,450,454,458,462,466,470,474,479,483,487,491,495,499,503,507,511,515,519,523,527,531,534,538,542,546,550,554,558,561,565,569,573,576,580,584,588,591,595,599,602,606,610,613,617,620,624,628,631,635,638,642,645,649,652,656,659,663,666,669,673,676,680,683,686,690,693,696,700,703,706,709,713,716,719,722,726,729,732,735,738,742,745,748,751,754,757,760,764,767,770,773,776,779,782,785,788,791,794,797,800,803,806,809,811,814,817,820,823,826,829,832,834,837,840,843,846,848,851,854,857,860,862,865,868,870,873,876,879,881,884,887,889,892,894,897,900,902,905,907,910,913,915,918,920,923,925,928,930,933,935,938,940,943,945,947,950,952,955,957,960,962,964,967,969,971,974,976,978,981,983,985,988,990,992,994,997,999,1001,1003,1006,1008,1010,1012,1015,1017,1019,1021,1023,1025,1028,1030,1032,1034,1637,
+  },
+  {1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,2875,4095,4079,4062,4046,4030,4014,3999,3983,3967,3952,3937,3921,3906,3891,3876,3861,3846,3832,3817,3803,3788,3774,3760,3746,3732,3718,3704,3690,3677,3663,3650,3636,3623,3610,3597,3584,3571,3558,3545,3532,3520,3507,3495,3483,3470,3458,3446,3434,3422,3410,3399,3387,3375,3364,3352,3341,3329,3318,3307,3296,3285,3274,3263,3252,3242,3231,3220,3210,3199,3189,3179,3169,3158,3148,3138,3128,3118,3109,3099,3089,3079,3070,3060,3051,3041,3032,3023,3014,3005,2995,2986,2977,2969,2960,2951,2942,2934,2925,2916,2908,2899,2891,2883,2874,2866,2858,2850,2842,2834,2826,2818,2810,2802,2795,2787,2779,2772,2764,2757,2749,2742,2735,2727,2720,2713,2706,2699,2692,2685,2678,2671,2664,2657,2650,2644,2637,2630,2624,2617,2611,2604,2598,2591,2585,2579,2573,2566,2560,2554,2093,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,814,0,11,22,32,43,54,64,75,85,95,106,116,126,136,146,156,166,176,185,195,204,214,223,233,242,251,261,270,279,288,297,306,315,323,332,341,350,358,367,375,383,392,400,408,416,425,433,441,449,456,464,472,480,488,495,503,510,518,525,533,540,547,555,562,569,576,583,590,597,604,611,618,624,631,638,645,651,658,664,671,677,683,690,696,702,709,715,721,727,733,739,745,751,757,763,769,774,780,786,791,797,803,808,814,819,825,830,835,841,846,851,856,862,867,872,877,882,887,892,897,902,907,912,917,921,926,931,936,940,945,949,954,959,963,968,972,976,981,985,990,994,998,1002,1007,1011,1015,1019,1023,1027,1335,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,1638,
+  }
+};
+
+//Setup encoders and their corresponding variables
+Encoder amp_encoder(22, 23);
+long new_amp = 64;
+long old_amp = 64;
+Encoder period_encoder(24, 25);
+long new_period = 10;
+long old_period = 10;
+Encoder waveform_encoder(26, 27);
+long new_waveform = 2;
+long old_waveform = 2;
+int waveform_select = 2;
+
+//Setup LCD Display
+LiquidCrystal_I2C lcd(0x27,16,2);
+
+// Timer to regulate the step width
+int timer = 0;
+unsigned int millis_period = 13;
+
+void setup() {
+  //The sync pin can be run into an oscilliscope's trig channel to easiy find the waveform
+  pinMode(sync_pin, OUTPUT);
+  //Change the resolution of the analog ourput to its maximum (12 bit res)
+  analogWriteResolution(12);
+  //If serial debugging is enabled set up serial
+  #ifdef enable_serial_debug
+    Serial.begin(115200);
+  #endif
+  // Initialize timers and encoders
+  timer = micros();
+  amp_encoder.write(new_amp*4);
+  period_encoder.write(new_period*4);
+  waveform_encoder.write(new_waveform*4);
+
+  lcd.init();                      // initialize the lcd 
+  lcd.backlight();
+}
+
+void loop() {
+  lcd.setCursor(0,0);
+  lcd.print("Hello");
+  // Read in encoder values
+  new_amp = amp_encoder.read()/4;
+  new_period = period_encoder.read()/4;
+  new_waveform = waveform_encoder.read()/4;
+
+  // Check to see if any of the encoder values have changed. If they have, update their values.
+  //Handles ampltidue encoder
+  if(new_amp != old_amp){
+    // Make sure the value is within a valid range
+    if(new_amp > 127){
+      //128 ampltidue steps should be enough granularity
+      new_amp = 127;
+      amp_encoder.write(new_amp*4);
+    }
+    if(new_amp < 0){
+      new_amp = 0;
+      amp_encoder.write(new_amp*4);
+    }
+    old_amp = new_amp;
+  }
+
+  //Handles period encoder
+  if(new_period != old_period){
+    // Make sure the value is within a valid range
+    if(new_period > 100){
+      new_period = 100;
+      period_encoder.write(new_period*4);
+    }
+    //Anything less than three will cause errors
+    if(new_period < 3){
+      new_period = 3;
+      period_encoder.write(new_period*4);
+    }
+    old_period = new_period;
+  }
+
+  //Handles waveform encoder
+  if(new_waveform != old_waveform){
+    // Make sure the value is within a valid range
+    if(new_waveform > waveform_num-1){
+      new_waveform = waveform_num-1;
+      waveform_encoder.write(new_waveform*4);
+    }
+    if(new_waveform < 0){
+      new_waveform = 0;
+      waveform_encoder.write(new_waveform*4);
+    }
+    old_waveform = new_waveform;
+  }
+
+  // Creates a synch signal so an oscilliscope can more easily read irregular pulses
+  digitalWrite(sync_pin, !digitalRead(sync_pin));
+
+  // Output a signal to control the amplitude
+  analogWrite(amplitude_pin, map(new_amp, 0, 127, 0, 4095));
+
+  // The period of time each sample in the array should take in microseconds
+  // The 1000 converts from milliseconds to microseconds, and the 600 deivides by the number of samples in the array
+  // The -3 offset compensates for a 3 millisecond overhead created by the time it takes to do all of the calculations
+  unsigned int sample_period = (new_period-3)*1000/600;
+
+  #ifdef enable_serial_debug
+    Serial.print("Ampltidue: ");
+    Serial.println(map(new_amp, 0, 127, 0, 4095));
+    Serial.print("Period: ");
+    Serial.println(new_period);
+    Serial.print("Waveform #: ");
+    Serial.println(new_waveform);
+    delay(500);
+  #endif
+
+  // Cycle through the waveform samples over a given period of time
+  for(int i = 0; i < 600; i++){
+    while(micros()-timer < sample_period);
+    analogWrite(waveform_pin, waveforms[new_waveform][i]);
+    timer = micros();
+  }
+}
--- a/test/README
+++ b/test/README
@@ -0,0 +1,11 @@
+
+This directory is intended for PlatformIO Unit Testing and project tests.
+
+Unit Testing is a software testing method by which individual units of
+source code, sets of one or more MCU program modules together with associated
+control data, usage procedures, and operating procedures, are tested to
+determine whether they are fit for use. Unit testing finds problems early
+in the development cycle.
+
+More information about PlatformIO Unit Testing:
+- https://docs.platformio.org/page/plus/unit-testing.html