Diff: display.cpp

Revision:

112:3e59dadc569e

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/display.cpp	Thu Nov 11 03:45:49 2021 +0000
@@ -0,0 +1,46 @@
+/*
+    Project: 21_7segmentTest3_v5 (Lab Wk 10)
+    File: display.cpp (v. 1.0)
+    
+    Display "value" from 0 to F_16, DP (16_10), all off (17_10), and all on
+    (18_10) on 7-segment display.
+
+    Note: This display function requires an integer argument to be display, a 
+    BusOut object(passed by reference)on which to display the value of it's 
+    first argument, and a Serial object to which to send debugging output. This 
+    differs from the similar Week 8 Lab display function that depended upon 
+    global variables. The approached used here is more robust.
+    
+    Written by: Dr. C. S. Tritt
+    Created: 11/10/21 (v. 1.0)
+*/
+#include "display.h"
+
+void display(int disVal, BusOut &disBus, Serial &pc){
+    // 7-segment, active low look-up-table. Displays Hex 0 to F, dp, all off 
+    // and all on. 
+    const int lutAL[] = { 
+        0b00000011, // 0 = 0
+        0b10011111, // 1 = 1
+        0b00100101, // 2 = 2
+        0b00001101, // 3 = 3
+        0b10011001, // 4 = 4
+        0b01001001, // 5 = 5
+        0b01000001, // 6 = 6
+        0b00011111, // 7 = 7
+        0b00000001, // 8 = 8
+        0b00001001, // 9 = 9
+        0b00010001, // 10 = a
+        0b11000001, // 11 = b
+        0b11100101, // 12 = c
+        0b10000101, // 13 = d
+        0b01100001, // 14 = e
+        0b01110001, // 15 = f
+        0b11111110, // 16 = dp
+        0b11111111, // 17 = All off
+        0b00000000  // 18 = All on
+        //abcdefgp – 7-segement output codes 0 to 18, p is decimal point.
+    };
+    pc.printf("In display disVal = %d.\n", disVal); // Send display value.
+    disBus = lutAL[disVal];
+}
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