[AC2] Exercícios adicionais (ex1-4)

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

2ano/2semestre/ac2/extras_aula01-06/ex01.c

@@ -0,0 +1,19 @@
+#include <detpic32.h>
+
+int reverse_byte(int byte) {
+    byte = (byte & 0xF0) >> 4 | (byte & 0x0F) << 4;
+    byte = (byte & 0xCC) >> 2 | (byte & 0x33) << 2;
+    byte = (byte & 0xAA) >> 1 | (byte & 0x55) << 1;
+    return byte;
+}
+
+int main() {
+    TRISB |= 0x000F;
+    TRISE &= 0xFF00;
+
+    while (1) {
+        int sw = PORTB & 0x000F;
+        int reverse = reverse_byte(sw);
+        LATE = (LATE & 0xFF00) | sw | reverse;
+    }
+}

2ano/2semestre/ac2/extras_aula01-06/ex01.s

@@ -0,0 +1,66 @@
+	.equ	ADDR_BASE, 0xBF88
+	.equ	TRISB, 0x6040
+	.equ	PORTB, 0x6050
+	.equ	TRISE, 0x6100
+	.equ	LATE,  0x6120
+
+	.data
+	.text
+	.globl main
+
+main:
+	lui	$t7, ADDR_BASE
+	
+	lw	$t0, TRISB($t7)
+	ori	$t0, $t0, 0x000F
+	sw	$t0, TRISB($t7)
+
+	lw	$t0, TRISE($t7)
+	andi	$t0, $t0, 0xFF00
+	sw	$t0, TRISE($t7)
+
+loop:
+	lw	$t0, PORTB($t7)
+	andi	$t0, $t0, 0x000F
+
+	move	$a0, $t0
+	addi	$sp, $sp, -8
+	sw	$ra, 0($sp)
+	sw	$t0, 4($sp)
+	jal	reverse_byte
+	lw	$ra, 0($sp)
+	lw	$t0, 4($sp)
+	addi	$sp, $sp, 8
+	or	$t0, $t0, $v0
+
+	lw	$t1, LATE($t7)
+	andi	$t1, $t1, 0xFF00
+	or	$t1, $t1, $t0
+	sw	$t1, LATE($t7)
+
+	j	loop
+
+	jr	$ra
+
+reverse_byte:
+	move	$v0, $a0
+
+	andi	$t0, $v0, 0xF0
+	srl	$t0, $t0, 4
+	andi	$t1, $v0, 0x0F
+	sll	$t1, $t1, 4
+	or	$v0, $t0, $t1
+
+	andi	$t0, $v0, 0xCC
+	srl	$t0, $t0, 2
+	andi	$t1, $v0, 0x33
+	sll	$t1, $t1, 2
+	or	$v0, $t0, $t1
+
+	andi	$t0, $v0, 0xAA
+	srl	$t0, $t0, 1
+	andi	$t1, $v0, 0x55
+	sll	$t1, $t1, 1
+	or	$v0, $t0, $t1
+	
+	jr	$ra

2ano/2semestre/ac2/extras_aula01-06/ex02.c

@@ -0,0 +1,25 @@
+#include <detpic32.h>
+
+void delay(unsigned int ms) {
+    resetCoreTimer();
+    while (readCoreTimer() < ms * 20000);
+}
+
+int main() {
+    TRISE &= 0xFFF0;
+    LATE &= 0xFFF0;
+
+    while (1) {
+        char key = inkey();
+
+        if ('0' <= key && key <= '3') {
+            LATE = (LATE & 0xFFF0) | 0x0001 << (key - '0');
+        } else if (key != '\0') {
+            LATE = (LATE & 0xFFF0) | 0x000F;
+            delay(1000);
+            LATE &= 0xFFF0;
+        }
+    }
+
+    return 0;
+}

2ano/2semestre/ac2/extras_aula01-06/ex02.s

@@ -0,0 +1,102 @@
+	.equ	INKEY, 1
+	.equ	GETCHAR, 2
+	.equ	PUTCHAR, 3
+	.equ	READ_INT, 4
+	.equ	READ_INT10, 5
+	.equ	PRINT_INT, 6
+	.equ	PRINT_INT10, 7
+	.equ	PRINT_STR, 8
+	.equ	READ_STR, 9
+	.equ	EXIT, 10
+	.equ	READ_CORE_TIMER, 11
+	.equ	RESET_CORE_TIMER, 12
+
+	.equ	ADDR_BASE, 0xBF88
+	.equ	TRISE, 0x6100
+	.equ	LATE,  0x6120
+
+	.data
+	.text
+	.globl main
+
+main:
+	lui	$t7, ADDR_BASE
+	
+	lw	$t0, TRISE($t7)
+	andi	$t0, $t0, 0xFFF0
+	sw	$t0, TRISE($t7)
+
+	lw	$t0, LATE($t7)
+	andi	$t0, $t0, 0xFFF0
+	sw	$t0, LATE($t7)
+
+loop:
+	li	$v0, INKEY
+	syscall
+	move	$t0, $v0
+	beq	$t0, 0, loop
+
+	beq	$t0, '0', sw_0
+	beq	$t0, '1', sw_1
+	beq	$t0, '2', sw_2
+	beq	$t0, '3', sw_3
+
+	lw	$t0, LATE($t7)
+	andi	$t0, $t0, 0xFFF0
+	ori	$t0, $t0, 0x000F
+	sw	$t0, LATE($t7)
+
+	li	$a0, 1000
+	move	$s0, $ra
+	jal	delay
+	move	$ra, $s0
+
+	lw	$t0, LATE($t7)
+	andi	$t0, $t0, 0xFFF0
+	sw	$t0, LATE($t7)
+
+	j	end
+
+sw_0:
+	lw	$t0, LATE($t7)
+	andi	$t0, $t0, 0xFFF0
+	ori	$t0, $t0, 0x0001
+	sw	$t0, LATE($t7)
+	j	end
+
+sw_1:
+	lw	$t0, LATE($t7)
+	andi	$t0, $t0, 0xFFF0
+	ori	$t0, $t0, 0x0002
+	sw	$t0, LATE($t7)
+	j	end
+
+sw_2:
+	lw	$t0, LATE($t7)
+	andi	$t0, $t0, 0xFFF0
+	ori	$t0, $t0, 0x0004
+	sw	$t0, LATE($t7)
+	j	end
+
+sw_3:
+	lw	$t0, LATE($t7)
+	andi	$t0, $t0, 0xFFF0
+	ori	$t0, $t0, 0x0008
+	sw	$t0, LATE($t7)
+	j	end
+
+end:
+	j	loop
+	jr	$ra
+
+delay:
+	mul	$t0, $a0, 20000
+	li	$v0, RESET_CORE_TIMER
+	syscall
+
+delay_loop:
+	li	$v0, READ_CORE_TIMER
+	syscall
+	move	$t1, $v0
+	blt	$t1, $t0, delay_loop
+	jr	$ra

2ano/2semestre/ac2/extras_aula01-06/ex04.c

@@ -0,0 +1,69 @@
+#include <detpic32.h>
+
+const unsigned int dis7Scodes[] = {0x3F, 0x06, 0x5B, 0x4F, 0x66, 0x6D,
+                                   0xFD, 0x07, 0x7F, 0x6F, 0x77, 0xFC,
+                                   0x39, 0x5E, 0xF9, 0xF1};
+
+
+void delay(unsigned int ms) {
+    resetCoreTimer();
+    while (readCoreTimer() < ms * 20000);
+}
+
+typedef enum { HIGH, LOW } flag;
+
+void clearDisplays() {
+    LATD = (LATD & 0xFF9F) | 0x0040;
+    LATB &= 0x80FF;
+    LATD = (LATD & 0xFF9F) | 0x0020;
+    LATB &= 0x80FF;
+}
+
+void send2displays(unsigned char value) {
+    static flag f = LOW;
+    char high = dis7Scodes[value >> 4];
+    char low = dis7Scodes[value & 0x0F];
+
+    if (f == HIGH) {
+        LATD = (LATD & 0xFF9F) | 0x0040;
+        LATB = (LATB & 0x80FF) | high << 8;
+        f = LOW;
+    } else {
+        LATD = (LATD & 0xFF9F) | 0x0020;
+        LATB = (LATB & 0x80FF) | low << 8;
+        f = HIGH;
+    }
+}
+
+int main() {
+    TRISE &= 0xFFF0;
+    TRISD &= 0xFF9F;
+    TRISB &= 0x80FF;
+    LATE &= 0xFFF0;
+    clearDisplays();
+
+    char lastKey;
+    while (1) {
+        char key = inkey();
+
+        if ('0' <= key && key <= '3') {
+            LATE = (LATE & 0xFFF0) | 0x0001 << (key - '0');
+            lastKey = key;
+        } else if (key != '\0') {
+            LATE = (LATE & 0xFFF0) | 0x000F;
+            resetCoreTimer();
+            while (readCoreTimer() < 20000000)
+                send2displays(0xFF);
+            LATE &= 0xFFF0;
+            clearDisplays();
+            lastKey = 0xFF;
+        }
+
+        if ('0' <= lastKey && lastKey <= '3') {
+            send2displays(lastKey - '0');
+            delay(10);
+        }
+    }
+
+    return 0;
+}