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--- pm:lab:lab4-2021 [2021/04/05 09:58]
jan.vaduva [4. Exercitii]
+++ pm:lab:lab4-2021 [2021/04/05 12:15] (current)
alexandru.predescu [4. Exercitii]
@@ Line 122: / Line 122: @@
 {{ pm:lab:PB1.png?500 | PB1 }}
+<hidden>
+**Soluția** se găsește pe [[https://www.tinkercad.com/things/b2Yra0sAu2J-brilliant-lappi-habbi/editel?sharecode=LfeWdU6ojyT1VzyOCdjwU3ieYR6u4bV2-lEko5iVrTc|Tinkercad TMP36]]
+</hidden>
 **Task 1** Folosind cod specific de microcontroller, cititi valoarea potentiometrului doar atunci cand se apasa un buton.
@@ Line 127: / Line 131: @@
 {{ pm:lab:PB2.png?500 | PB2 }}
+<hidden>
+**Soluția** se găsește pe [[https://www.tinkercad.com/things/b2Yra0sAu2J-brilliant-lappi-habbi/editel?sharecode=LfeWdU6ojyT1VzyOCdjwU3ieYR6u4bV2-lEko5iVrTc|Tinkercad Interrupt]]
+<code>
+void timer_setup(){
+  // set timer A for 10ms
+  TCCR0A = 0;
+  TCCR0B = 0;
+  TCNT0  = 0;
+  OCR0A = 156;            // compare match -> 10ms
+  TCCR0A |= (1 << WGM01);   // CTC mode
+  TCCR0B |= ((1 << CS02) | (1 << CS00));    // 1024 prescaler
+  TIMSK0 |= (1 << OCIE0A);
+  // Enable timer as source
+  ADCSRB |= ((1 << ADTS0) | (1 << ADTS1));
+}
+void button_setup(){
+  // Select INT0 as trigger source
+  ADCSRB = 0;
+  ADCSRB |= (1 << ADTS1);
+  // Enable INT0
+  EICRA |= (1 << ISC00);
+  EIMSK |= (1 << INT0);
+}
+void setup()
+{
+  // disable interrupts
+  cli();
+  ADMUX = 0;
+  /* AVCC with external capacitor at AREF pin */
+  ADMUX |= (1 << REFS0);
+  ADCSRA = 0;
+  /* set prescaler at 128 */
+  ADCSRA |= (7 << ADPS0);
+  // Enable auto-trigger
+  ADCSRA |= (1 << ADATE);
+  // Enable Intrerupt
+  ADCSRA |= (1 << ADIE);
+  // Set button as trigger source
+  button_setup();
+  // Select Timer as trigger source
+  //timer_setup();
+  /* enable ADC */
+  ADCSRA |= (1 << ADEN);
+  // Enable interrupts
+  sei();
+  Serial.begin(9600);
+}
+ISR(ADC_vect){
+  Serial.println(ADC);
+}
+ISR(INT0_vect)
+{
+  Serial.println("Button Pressed!");
+}
+ISR(TIMER0_COMPA_vect){
+  // Even if this does nothing. It has to be here
+  // Else the code just doesn't work. Still don't know why.
+  // [AP] Deoarece ai activat intreruperea de compare match: TIMSK0 |= (1 << OCIE0A);
+  // [AP] Astfel, daca nu e definit ISR-ul se va reseta uC
+}
+void loop()
+{
+  delay(50);
+}
+</code>
+</hidden>
 **Task 2** Folosind cod specific microcontrollerului cititi valoarea potentiometrului o data la 10ms. Pentru aceste exercitiu trebuie sa folositi ADC-ul sa porneasca o conversie automat in functie de un timer.
 <note>Codul trebuie testat pe Arduino, Tinkercad nu are suport pentru Auto-trigger.</note>
+<hidden>
+**Soluția** se găsește pe [[https://www.tinkercad.com/things/grYhoajb3sd-exquisite-hango-waasa/editel?sharecode=gNPGmOuI6oZBx3bp-q-S7NlxWoz_wRwWZm9LJK4DHbI|Tinkercad Potentiometer]]
+<code>
+void timer_setup(){
+  // set timer A for 10ms
+  TCCR0A = 0;
+  TCCR0B = 0;
+  TCNT0  = 0;
+  OCR0A = 156; // compare match -> 10ms
+  TCCR0A |= (1 << WGM01);  // CTC mode
+  TCCR0B |= ((1 << CS02) | (1 << CS00)); // 1024 prescaler
+  TIMSK0 |= (1 << OCIE0A);
+  // Enable timer as source
+  ADCSRB |= ((1 << ADTS0) | (1 << ADTS1));
+}
+void setup()
+{
+  pinMode(2, INPUT_PULLUP);
+  // disable interrupts
+  cli();
+  ADMUX = 0;
+  /* AVCC with external capacitor at AREF pin */
+  ADMUX |= (1 << REFS0);
+  ADCSRA = 0;
+  /* set prescaler at 128 */
+  ADCSRA |= (7 << ADPS0);
+  // Enable auto-trigger
+  ADCSRA |= (1 << ADATE);
+  // Enable Intrerupt
+  ADCSRA |= (1 << ADIE);
+  // Select Timer as trigger source
+  timer_setup();
+  /* enable ADC */
+  ADCSRA |= (1 << ADEN);
+  // Enable interrupts
+  sei();
+  Serial.begin(9600);
+}
+ISR(ADC_vect){
+  Serial.println(ADC);
+}
+ISR(TIMER0_COMPA_vect){
+  // Even if this does nothing. It has to be here
+  // Else the code just doesn't work. Still don't know why.
+  // [AP] Deoarece ai activat intreruperea de compare match: TIMSK0 |= (1 << OCIE0A);
+  // [AP] Astfel, daca nu e definit ISR-ul se va reseta uC
+}
+void loop()
+{
+  delay(50);
+}
+</code>
+</hidden>
 ===== 5. Resurse =====