FFT LED Display
this hurts
Dependencies: FFT
Diff: main.cpp
- Revision:
- 1:5dd6801bb0d6
- Parent:
- 0:d6c9b09b4042
- Child:
- 2:a6e81c45ef48
--- a/main.cpp Wed Dec 02 18:02:03 2020 +0000
+++ b/main.cpp Wed Dec 02 23:39:20 2020 +0000
@@ -17,22 +17,179 @@
DigitalOut myled(LED1); // mbed LED
-void fft_calc_thread(void const* args) {
- //something
- //pull the array off of sd card
- //vTealfft(arr, 1024);
+// delete later
+int sample[12][8] = {
+ 34085,32666,29810,29823,27514,24175,24468,32559,
+ 36401,33075,29037,21933,20189,21751,20975,20087,
+ 17530,27723,30891,21128,19982,15446,12413,13597,
+ 15776,14233,15622,16334,15485,17136,16389,17954,
+ 20349,18486,23377,34447,34400,34681,33107,31171,
+ 30007,33640,37007,38136,39187,38169,51831,52041,
+ 47831,48634,44189,43878,44743,46468,43170,47172,
+ 53518,52294,54825,51992,49619,48147,47901,48413,
+ 46049,49090,47590,46154,45423,41223,41782,54695,
+ 57452,51210,52462,59096,56711,52268,49364,42865,
+ 41483,37964,39215,35908,31570,28332,24492,23121,
+ 22874,18154,15541,15263,12463,12198,13301,9951
+};
+
+// states for display output
+const int on[8][8] =
+{1, 1, 1, 1, 1, 1, 1, 1,
+1, 1, 1, 1, 1, 1, 1, 1,
+1, 1, 1, 1, 1, 1, 1, 1,
+1, 1, 1, 1, 1, 1, 1, 1,
+1, 1, 1, 1, 1, 1, 1, 1,
+1, 1, 1, 1, 1, 1, 1, 1,
+1, 1, 1, 1, 1, 1, 1, 1,
+1, 1, 1, 1, 1, 1, 1, 1};
+
+const int high[8][8] =
+{0, 0, 0, 1, 1, 0, 0, 0,
+0, 0, 0, 1, 1, 0, 0, 0,
+0, 0, 1, 1, 1, 1, 0, 0,
+0, 1, 1, 1, 1, 1, 1, 0,
+0, 1, 1, 1, 1, 1, 1, 0,
+1, 1, 1, 1, 1, 1, 1, 1,
+1, 1, 1, 1, 1, 1, 1, 1,
+1, 1, 1, 1, 1, 1, 1, 1};
+
+const int med[8][8] =
+{0, 0, 0, 0, 0, 0, 0, 0,
+0, 0, 0, 0, 0, 0, 0, 0,
+0, 0, 0, 1, 1, 0, 0, 0,
+0, 0, 1, 1, 1, 1, 0, 0,
+0, 0, 1, 1, 1, 1, 0, 0,
+0, 1, 1, 1, 1, 1, 1, 0,
+1, 1, 1, 1, 1, 1, 1, 1,
+1, 1, 1, 1, 1, 1, 1, 1};
+
+const int low[8][8] =
+{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, 1, 1, 1, 1, 0, 0,
+0, 1, 1, 1, 1, 1, 1, 0,
+1, 1, 1, 1, 1, 1, 1, 1};
+
+const int off[8][8] =
+{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};
+
+void display_thread(void const* args) {
+
+ int state = 0;
+ matrix.begin(0x70);
+
while(1) {
- myled = 1;
- wait(0.2);
- myled = 0;
- wait(0.2);
+ for (int a = 0; a < 12; a++) {
+ for (int b = 0; b < 8; b++) {
+
+ // grab the FFT frequencies;
+ int freq = sample[a][b];
+
+ // determine state based on the FFT output range
+ if (freq >= 0 && freq < 10000) {
+ state = 5; // OFF
+ } else if (freq >= 10000 && freq < 25000) {
+ state = 4; // LOW
+ } else if (freq >= 25000 && freq < 40000) {
+ state = 3; // MED
+ } else if (freq >= 40000 && freq < 55000) {
+ state = 2; // HIGH
+ } else if (freq >= 55000) {
+ state = 1; // ON
+ }
+
+ // switch statement based on the state
+ switch (state) {
+ case(1): // CASE HIGHEST
+ matrix.clear();
+ for (int i = 0; i < 8; i++) {
+ for (int j = 0; j < 8; j++) {
+ if (on[i][j] == 1) {
+ matrix.drawPixel(i, j, LED_ON);
+ }
+ }
+ }
+ matrix.writeDisplay();
+ wait(1);
+ break;
+
+ case(2): // CASE HIGH
+ matrix.clear();
+ for (int i = 0; i < 8; i++) {
+ for (int j = 0; j < 8; j++) {
+ if (high[i][j] == 1) {
+ matrix.drawPixel(i, j, LED_ON);
+ }
+ }
+ }
+ matrix.writeDisplay();
+ wait(1);
+
+ case(3): // CASE MEDIUM
+ matrix.clear();
+ for (int i = 0; i < 8; i++) {
+ for (int j = 0; j < 8; j++) {
+ if (med[i][j] == 1) {
+ matrix.drawPixel(i, j, LED_ON);
+ }
+ }
+ }
+ matrix.writeDisplay();
+ wait(1);
+ break;
+
+ case(4): // CASE LOW
+ matrix.clear();
+ for (int i = 0; i < 8; i++) {
+ for (int j = 0; j < 8; j++) {
+ if (low[i][j] == 1) {
+ matrix.drawPixel(i, j, LED_ON);
+ }
+ }
+ }
+ matrix.writeDisplay();
+ wait(1);
+ break;
+
+ case(5): // CASE OFF
+ matrix.clear();
+ for (int i = 0; i < 8; i++) {
+ for (int j = 0; j < 8; j++) {
+ if (off[i][j] == 1) {
+ matrix.drawPixel(i, j, LED_ON);
+ }
+ }
+ }
+ matrix.writeDisplay();
+ wait(1);
+ break;
+
+ default:
+ break;
+ }
+
+
+ }
+ }
}
}
void speaker_thread(void const* args)
{
while(1)
- {
+ {
+ // check helper function for new song in GUI
// grab file here and put together string
// string song_title = "/sd/" + "" + ".wav";
@@ -53,18 +210,13 @@
{
Thread th1(speaker_thread);
- Thread th2(fft_calc_thread);
-
- matrix.begin(0x70);
+ Thread th2(display_thread);
+
while(1) {
- for (int i = 0; i < 8; i++) {
- for (int j = 0; j < 8; j++) {
- matrix.clear();
- matrix.drawPixel(i, j, LED_ON);
- matrix.writeDisplay();
- wait(.5);
- }
- }
+ myled = 1;
+ wait(0.2);
+ myled = 0;
+ wait(0.2);
Thread::wait(100);
}