From 98850dad7260f2dc33e5726222be4decdf098e18 Mon Sep 17 00:00:00 2001
From: RossTheRoss <msattr@gmail.com>
Date: Sun, 23 Feb 2020 19:38:25 -0600
Subject: I hate this (Lab 3 partially working again)

---
 Lab3.X/numpad.c | 95 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 95 insertions(+)

(limited to 'Lab3.X/numpad.c')

diff --git a/Lab3.X/numpad.c b/Lab3.X/numpad.c
index fcd87cc..271b324 100644
--- a/Lab3.X/numpad.c
+++ b/Lab3.X/numpad.c
@@ -7,3 +7,98 @@ void initKeyPad(void) {
     CNPU1bits.CN13PUE = 1;
     CNPU1bits.CN14PUE = 1;
 }
+void padDelay(long n) {
+    for (n=n; n>0; n--) {
+            asm("nop");
+        }
+}
+//  1   2   3   4   5       6       7       8
+//  RA0 RA1 RA2 RA3 RB15    RB14    RB13    RB12
+char readKeyPadRAW(void) {
+    int i; 
+    char num;
+    num = (!_RB15 << 3) | (!_RB14 << 2) | (!_RB13 << 1) | !_RB12;
+    LATB |= (0b1111 << 12);
+    for (i = 0; i < 4; i++) {
+        LATB ^= 0b1 << (15 - i);
+        padDelay(10);
+        switch (i) {
+            case 0:
+                switch (num) {
+                    case 0b1110:
+                        return 'A';
+                        break;
+                    case 0b1101:
+                        return '3';
+                        break;
+                    case 0b1011:
+                        return '2';
+                        break;
+                    case 0b111:
+                        return '1';
+                        break;
+                } break;
+            case 1:
+                switch (num) {
+                    case 0b1110:
+                        return 'b';
+                        break;
+                    case 0b1101:
+                        return '6';
+                        break;
+                    case 0b1011:
+                        return '5';
+                        break;
+                    case 0b111:
+                        return '4';
+                        break;
+                } break;
+            case 2:
+                switch (num) {
+                    case 0b1110:
+                        return 'C';
+                        break;
+                    case 0b1101:
+                        return '9';
+                        break;
+                    case 0b1011:
+                        return '8';
+                        break;
+                    case 0b111:
+                        return '7';
+                        break;
+                } break;
+            case 3:
+                switch (num) {
+                    case 0b1110:
+                        return 'd';
+                        break;
+                    case 0b1101:
+                        return 'E';
+                        break;
+                    case 0b1011:
+                        return '0';
+                        break;
+                    case 0b111:
+                        return 'F';
+                        break;
+                } break;
+        }   //END switch(i);
+        LATB |= (0b1111 << 12);
+    }
+    return '\0';
+}
+/*
+Outputs<8:5> = 0b0111;  // Set Row 1 output Low
+delay(1us);             // this delay could be lower, probably 2-3 cycles
+RowOne = Inputs<4:1>;   // returns 0b1111 (no buttons pressed in row 1)
+
+Outputs<8:5> = 0b1011;  // Set Row 2 output Low
+delay(1us);
+RowTwo = Inputs<4:1>;   // returns 0b1101 (the ?6? key was pressed!)
+...
+Outputs<8:5> = 0b1110;  // Set Row 4 output Low
+delay(1us);
+RowFour = Inputs<4:1>;  // returns 0b1111 (no buttons pressed in row 4)
+
+ */
\ No newline at end of file
-- 
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