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pico/modumin.ino

+//libraries
+
+#include <stdio.h>
+#include "hardware/adc.h"
+#include "hardware/vreg.h"
+#include "hardware/dma.h"
+#include "hardware/pll.h"
+#include "hardware/clocks.h"
+#include "math.h"
+#include "pico/multicore.h"
+#include "pico/util/datetime.h"
+#include "Adafruit_ZeroFFT.h"
+#include "arduino.h"
+#include <WiFi.h>
+#include <WebServer.h>
+
+//frontend
+  // Set up WiFi credentials
+  const char* ssid = "GreedyInternetProvider";
+  const char* password = "manamana";
+
+
+
+//MIDI structure
+  int note_midi[85]={43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,99,100,101,102,103,104,105,106,107,108,109,110,111,112,113,114,115,116,117,118,119,120,121,122,123,124,125,126,127}; 
+  float note_freq[85]={97.998859,103.826174,110.000000,116.540940,123.470825,130.812783,138.591315,146.832384,155.563492,164.813778,174.614116,184.997211,195.997718,207.652349,220.000000,233.081881,246.941651,261.625565,277.182631,293.664768,311.126984,329.627557,349.228231,369.994423,
+                          391.995436,415.304698,440.000000,466.163762,493.883301,523.251131,554.365262,587.329536,622.253967,659.255114,698.456463,739.988845,783.990872,830.609395,880.000000,932.327523,987.766603,1046.502261,1108.730524,1174.659072,1244.507935,1318.510228,1396.912926,1479.977691,
+                          1567.981744,1661.218790,1760.000000,1864.655046,1975.533205,2093.004522,2217.461048,2349.318143,2489.015870,2637.020455,2793.825851,2959.955382,3135.963488,3322.437581,3520.000000,3729.310092,3951.066410,4186.009045,4434.922096,4698.636287,4978.031740,5274.040911,5587.651703,
+                          5919.910763,6271.926976,6644.875161,7040.000000,7458.620184,7902.132820,8372.018090,8869.844191,9397.272573,9956.063479,10548.081821,11175.303406,11839.82,12543.85}; 
+
+
+
+
+
+
+//defines
+  #define NFFT 4096
+  #define SAMPLES 2048
+  #define DC_VAL 2500
+  #define CAPTURE_CHANNEL 0
+  #define CLOCKDIVIDER 1600
+  #define WINDOW 20 
+  #define LOW_BINS 10 //determines how many FFT values near zero are to be set to zero
+  #define FFT_FLOOR 10 //determines what os considere a random noise and what is acrually useful
+//variables
+  float BIN_SIZE = 11;
+  int16_t read_buffer[NFFT];
+  int16_t transfer_buffer[NFFT/2];
+  //variables
+  uint64_t read_time2;
+  uint64_t read_time;  //total time of sample aquisition
+  float FS=30000;         //sampling freq
+  float FREQ=0;
+  int flipflop = 0;
+  int freq_avg = 0;
+  int DC=0;
+
+
+//backend
+    void info_print() {
+      Serial.println(" ");
+      Serial.print("read time:");
+      Serial.println(read_time);
+      Serial.println(FS);
+      Serial.print("total_time:");
+      Serial.println(micros() - read_time2);
+      BIN_SIZE=FS/NFFT;
+      Serial.print("frequency step:");
+      Serial.println(BIN_SIZE);
+    }
+    float find_max(){
+      int max_val=FFT_FLOOR;
+      int max_index=0;
+      float out_index=0;
+      for(int i=0;i<LOW_BINS;i++)
+      {
+        read_buffer[i]=3;
+      }
+      for(int i=LOW_BINS;i<NFFT/2;i++){
+        if(read_buffer[i]>max_val){
+          max_val=read_buffer[i];
+          max_index=i;
+        }
+      }
+      
+      if(max_index>LOW_BINS && max_val>FFT_FLOOR){
+        return max_index;
+      }
+    
+      return 0;
+    }
+    void data_print(){
+      for (int i = 0; i < NFFT/2; i++) {
+        Serial.println(read_buffer[i]);
+      }
+
+    }
+    int freq_to_midi(){
+      int midi=0;
+      if(FREQ>100 && FREQ<12000){
+        for(int i=0;i<82;i++){
+          if(note_freq[i]<FREQ&&FREQ<note_freq[i+1]){
+            midi=  i+43;
+            break;
+            if(FREQ-note_freq[i]>note_freq[i+1]-FREQ){
+              midi= i;
+              break;
+            }
+            else{
+              midi= (i+1);
+              break;
+            }
+          }
+        }
+      }
+      else{
+        midi= -1;
+      }
+      return midi;
+    }
+    void send_MIDI(byte noteOnStatus, byte noteNumber, byte velocity) {
+      Serial1.write(noteOnStatus);
+      Serial1.write(noteNumber);
+      // Check if the MIDI message is a two-byte message (e.g., Note On, Note Off)
+      if ((noteOnStatus & 0xF0) != 0xC0 && (noteOnStatus & 0xF0) != 0xD0) {
+        Serial1.write(velocity);
+      }
+  }
+
+  // Set up global variable
+  int mode_select = 0;
+  int midi =10;
+
+  WebServer server(80);
+
+  //POST request handler
+  void handlePost(){
+    if (server.method() == HTTP_POST) {
+      String valueStr = server.arg("mode");
+      if (valueStr == "1" || valueStr == "0") {
+        mode_select = valueStr.toInt();
+        server.send(200, "text/plain", "Value set successfully");
+      } else {
+        server.send(400, "text/plain", "Invalid value. It should be either 1 or 0.");
+      }
+    } else {
+      server.send(405, "text/plain", "Method Not Allowed");
+    }
+  }
+
+  //first outcome handler (musical note)
+  void handleOutcome1() {
+      server.send(200, "text/plain", String(midi));
+  }
+  //second outcome handler (Spectrum note)
+  void handleOutcome2() {
+    int dataArray[NFFT/2];
+    String dataString = "";
+      for (int i = 0; i <NFFT/2; i++){
+        dataString += transfer_buffer[i];
+        if (i < sizeof(dataArray) / sizeof(dataArray[0]) - 1) {
+          dataString += ","; 
+        }
+      }
+      server.send(200, "text/plain", dataString);
+  }
+
+
+
+/////////////////////////////////////////////////////Core0
+void setup() {
+  Serial.begin(115200);
+  delay(1000);
+
+  // Connect to WiFi
+  WiFi.begin(ssid, password);
+  while (WiFi.status() != WL_CONNECTED) {
+    delay(1000);
+    Serial.println("Connecting to WiFi...");
+  }
+
+  Serial.println("Connected to WiFi");
+  // Print IP address
+  Serial.print("IP Address: ");
+  Serial.println(WiFi.localIP());
+  // Set up routes
+  server.on("/select", handlePost);
+  server.on("/note", handleOutcome1);
+  server.on("/spectrum", handleOutcome2);
+
+  // Start server
+  server.begin();
+  Serial.println("HTTP server started");
+}
+void loop() {
+  if(rp2040.fifo.pop_nb(FREQ)){
+    DC=rp2040.fifo.pop();
+    DC=(DC*120/4096);
+  }
+  
+  if(mode_select==0){
+    rp2040.fifo.push(0);
+  }
+  if(mode_select==1){
+    rp2040.fifo.push(1);
+    for(int i=0;i<NFFT/2;i++){
+      transfer_buffer[i]=rp2040.fifo.pop();
+    }
+  }
+  midi=freq_to_midi();
+  if(midi>0){
+    if(DC > 0){
+      send_MIDI(10010000, midi, DC);
+    }
+    else{
+      send_MIDI(10000000, midi, DC);
+    }
+  }
+  
+  
+  server.handleClient();
+}
+/////////////////////////////////////////////core1
+void setup1(){
+  Serial.begin(115200);
+  adc_gpio_init(26 + CAPTURE_CHANNEL);
+  adc_init();
+  adc_select_input(CAPTURE_CHANNEL);
+  adc_fifo_setup(true, false, 0, false, false);
+  adc_set_clkdiv(CLOCKDIVIDER);
+}
+void loop1(){
+  float local_freq=0;
+  adc_run(true);  //run adc
+  read_time2 = micros();
+  for (int i = 0; i < SAMPLES; i++) {
+    read_buffer[i] = adc_fifo_get_blocking()-DC_VAL;  //gets last sample from adc
+  }
+  
+  adc_run(false);  //stops adc
+  for (int i = SAMPLES; i < NFFT; i++){//zero paddind
+  read_buffer[i]=0;
+  }
+  
+  ZeroFFT(read_buffer, NFFT);
+  rp2040.fifo.push(find_max()*FS/NFFT);
+  //volume read
+  adc_select_input(1);
+  rp2040.fifo.push(adc_read());
+  adc_select_input(0);
+  
+  if(rp2040.fifo.pop()==1){
+      for (int i = 0; i <NFFT/2; i++){
+        rp2040.fifo.push(read_buffer[i]);
+      }
+    }
+  read_time = micros() - read_time2;
+  for(int i=0;i<LOW_BINS;i++){//sets values near dc to zero
+    read_buffer[i]=0;
+  }
+}