[AC2] Aula08

Signed-off-by: TiagoRG <tiago.rgarcia@ua.pt>

2ano/2semestre/ac2/aula08/part1-ex1.c

@@ -0,0 +1,16 @@
+#include <detpic32.h>
+
+int main() {
+    T3CONbits.TCKPS = 7;            // 1:256 prescaler
+    PR3 = 39062;                    // Fout = 20MHz / (256 * (39062 + 1)) = 2Hz
+    TMR3 = 0;                       // Reset timer T3 count register
+    T3CONbits.TON = 1;              // Enable timer T3 (must be the last command of the timer configuration sequence)
+
+    while (1) {
+        while (IFS0bits.T3IF == 0); // Wait while T3IF is 0
+        IFS0bits.T3IF = 0;          // Reset T3IF
+        putChar('.');
+    }
+
+    return 0;
+}

2ano/2semestre/ac2/aula08/part1-ex2.c

@@ -0,0 +1,22 @@
+#include <detpic32.h>
+
+void _int_(12) isr_T3(void) {
+    putChar('.');
+    IFS0bits.T3IF = 0;              // Reset timer T3 interrupt flag
+}
+
+int main() {
+    T3CONbits.TCKPS = 7;            // 1:256 prescaler
+    PR3 = 39062;                    // Fout = 20MHz / (256 * (39062 + 1)) = 2Hz
+    TMR3 = 0;                       // Reset timer T3 count register
+    T3CONbits.TON = 1;              // Enable timer T3 (must be the last command of the timer configuration sequence)
+
+    IPC3bits.T3IP = 2;              // Interrupt priority (must be in range [1..6])
+    IEC0bits.T3IE = 1;              // Enable timer T3 interrupts
+    IFS0bits.T3IF = 0;              // Reset timer T3 interrupt flag
+
+    EnableInterrupts();             // Global Interrupt Enable
+    while (1);
+
+    return 0;
+}

2ano/2semestre/ac2/aula08/part1-ex3.c

@@ -0,0 +1,24 @@
+#include <detpic32.h>
+
+void _int_(12) isr_T3(void) {
+    static int flag = 0;
+    if (flag == 0) putChar('.');
+    flag = !flag;
+    IFS0bits.T3IF = 0;              // Reset timer T3 interrupt flag
+}
+
+int main() {
+    T3CONbits.TCKPS = 7;            // 1:256 prescaler
+    PR3 = 39062;                    // Fout = 20MHz / (256 * (39062 + 1)) = 2Hz
+    TMR3 = 0;                       // Reset timer T3 count register
+    T3CONbits.TON = 1;              // Enable timer T3 (must be the last command of the timer configuration sequence)
+
+    IPC3bits.T3IP = 2;              // Interrupt priority (must be in range [1..6])
+    IEC0bits.T3IE = 1;              // Enable timer T3 interrupts
+    IFS0bits.T3IF = 0;              // Reset timer T3 interrupt flag
+
+    EnableInterrupts();             // Global Interrupt Enable
+    while (1);
+
+    return 0;
+}

2ano/2semestre/ac2/aula08/part1-ex4.c

@@ -0,0 +1,57 @@
+#include <detpic32.h>
+
+int counters[] = {0, 0};
+
+void print() {
+    putChar('\r');
+    printStr("T1: ");
+    printInt10(0[counters]);
+    printStr(" T3: ");
+    printInt10(1[counters]);
+}
+
+void _int_(4) isr_T1(void) {
+    counters[0]++;
+    LATD ^= 0x0001;
+    LATE ^= 0x0002;
+    print();
+    IFS0bits.T1IF = 0;              // Reset timer T1 interrupt flag
+}
+
+void _int_(12) isr_T3(void) {
+    counters[1]++;
+    LATD ^= 0x0004;
+    LATE ^= 0x0008;
+    print();
+    IFS0bits.T3IF = 0;              // Reset timer T3 interrupt flag
+}
+
+int main() {
+    T1CONbits.TCKPS = 2;
+    PR1 = 62499;
+    TMR1 = 0;
+    T1CONbits.TON = 1;
+
+    T3CONbits.TCKPS = 4;
+    PR3 = 49999;
+    TMR3 = 0;
+    T3CONbits.TON = 1;
+
+    IPC1bits.T1IP = 2;              // Interrupt priority (must be in range [1..6])
+    IEC0bits.T1IE = 1;              // Enable timer T1 interrupts
+    IFS0bits.T1IF = 0;              // Reset timer T1 interrupt flag
+
+    IPC3bits.T3IP = 2;              // Interrupt priority (must be in range [1..6])
+    IEC0bits.T3IE = 1;              // Enable timer T3 interrupts
+    IFS0bits.T3IF = 0;              // Reset timer T3 interrupt flag
+
+    TRISD &= 0xFFFA;
+    LATD &= 0xFFFA;
+    TRISE &= 0xFFF5;
+    LATE &= 0xFFF5;
+
+    EnableInterrupts();             // Global Interrupt Enable
+    while (1);
+
+    return 0;
+}

2ano/2semestre/ac2/aula08/part1-ex4.txt

@@ -0,0 +1,17 @@
+Timer 1
+
+K > 20000000 / (65536 * 5)
+K > 61.035
+K = 64
+
+PR1 = ((20000000 / 64) / 5) - 1 = 62499
+
+------------------------------------------------
+
+Timer 3
+
+K > 20000000 / (65536 * 25)
+K > 12.207
+K > 16
+
+PR3 = ((20000000 / 16) / 25) - 1 = 49999

2ano/2semestre/ac2/aula08/part2-ex1.c

@@ -0,0 +1,21 @@
+#include <detpic32.h>
+
+void delay(unsigned int ms) {
+    resetCoreTimer();
+    while (readCoreTimer() < 20000 * ms);
+}
+
+int main() {
+    TRISD |= 0x0100;
+    TRISE &= 0xFFFE;
+    LATE &= 0xFFFE;
+
+    while (1) {
+        while (((PORTD >> 8) & 0x0001) == 1);
+        LATE ^= 0x0001;
+        delay(3000);
+        LATE ^= 0x0001;
+    }
+
+    return 0;
+}

2ano/2semestre/ac2/aula08/part2-ex2.c

@@ -0,0 +1,41 @@
+#include <detpic32.h>
+
+void _int_(8) isr_T2() {
+    static int c = 0;
+    if (c++ == 6) {
+        IEC0bits.T2IE = 0;
+        LATE &= 0xFFFE;
+        c = 0;
+    }
+    IFS0bits.T2IF = 0;
+}
+
+void _int_(7) isr_INT1() {
+    LATE |= 0x0001;
+    IEC0bits.T2IE = 1;
+    IFS0bits.INT1IF = 0;
+}
+
+int main() {
+    TRISD |= 0x0100;
+    TRISE &= 0xFFFE;
+    LATE &= 0xFFFE;
+
+    IPC1bits.INT1IP = 2;
+    IEC0bits.INT1IE = 1;
+    IFS0bits.INT1IF = 0;
+
+    IPC2bits.T2IP = 2;
+    IFS0bits.T2IF = 0;
+
+    T2CONbits.TCKPS = 7;
+    PR2 = 39062;
+    TMR2 = 0;
+    T2CONbits.TON = 1;
+
+    EnableInterrupts();
+
+    while (1);
+
+    return 0;
+}