firmware: always empty buffers when reading

And recalculate SAMPLE_FREQ

Firmware/32u4/gdf_32u4/gdf_32u4.ino

@@ -25,8 +25,8 @@
 /*----------------*/
 
 /*INFO*/
-unsigned long frequency = 1000, duty = 50, type = 1;
-float Vpp = 24.0, Voff = 12.0;
+unsigned long frequency = 1000, duty = 50, type = 0;
+float Vpp = 6.4, Voff = 0.0;
 /*-----------*/
 
 int pushbutton, old_pushbutton;
@@ -117,6 +117,7 @@ void editMode(){
         break;
     }
   }else if(editing_step == 1) {
+    if(type!=1) editing_step++;
     currently_editing = &duty;
     lcd.setCursor(0,0);
     lcd.print("Duty: ");
@@ -178,6 +179,7 @@ void communicateChanges(){
   unsigned long t1 = millis();
   boolean b = false;
 
+  Serial1.flush();
   digitalWrite(LED_BUILTIN, HIGH);
   while(Serial1.read() != 42){  //The answer to Life, Universe, And Everything Else
     if(millis() - t1 > 100){
@@ -206,6 +208,8 @@ void communicateChanges(){
   lcd.clear();
   
   //Built the string with the info and set it to the teensy until a positive response is received
+  Serial1.flush();
+  
   while(Serial1.read() != 69){
     if(millis() - t1 > 250){
   

Firmware/Teensy/.vscode/c_cpp_properties.json

@@ -222,12 +222,14 @@
                 "PLATFORMIO=50101",
                 "__MK64FX512__",
                 "ARDUINO_TEENSY35",
+                "TEENSY_OPT_FASTEST_PURE_CODE_LTO",
                 "USB_SERIAL",
                 "ARDUINO=10805",
                 "TEENSYDUINO=153",
                 "CORE_TEENSY",
-                "F_CPU=120000000L",
+                "F_CPU=168000000L",
                 "LAYOUT_US_ENGLISH",
+                "__PURE_CODE__",
                 ""
             ],
             "cppStandard": "c++14",
@@ -237,6 +239,7 @@
                 "-mcpu=cortex-m4",
                 "-mfloat-abi=hard",
                 "-mfpu=fpv4-sp-d16",
+                "-mpure-code",
                 ""
             ]
         }

Firmware/Teensy/include/sine.h

@@ -4,7 +4,7 @@
 
 // Sampling frequency of the DAC
 // Since the teensy runs on 168MHz and Fastest + LTO, using the DAC sampling frequency (1428571Hz) from the Datasheet kinda falls apart
-#define SAMPLE_FREQ 6222000 
+#define SAMPLE_FREQ 6988800 
 
 //Max Freq with good results achievable with Teensy 3.5 DAC
 #define MAX_ACHIEVABLE_FREQ 1000000

Firmware/Teensy/src/main.cpp

@@ -26,15 +26,18 @@ void setup() {
 
 void loop() {
   if(receivingInfo){
+
     Serial1.write(42);  //The answer to life, universe and everything else
     digitalWriteFast(LED_BUILTIN, HIGH);
 
+    Serial1.flush();
+
     delay(1000);
     receivingInfo = false;
     valid_flag = false;
 
     while(!valid_flag){
-      s = Serial1.readStringUntil('W');
+      while(Serial1.available()) s = Serial1.readStringUntil('W');
       Serial.println(s);
       //Check if it's a valid string, it should start with 'w'
       if(!s.startsWith('w')) continue;
@@ -52,8 +55,6 @@ void loop() {
       for(int i = 0; i < 100; i++) Serial1.write(69);
       valid_flag = true;
 
-      Serial1.flush();
-
       valid_flag = true;
       Serial.print("Type: " );
       Serial.println(type);