From eaacc18ab11937a673e5b57b58deb80007a71b3b Mon Sep 17 00:00:00 2001
From: Eric Tang <e_l_tang@outlook.com>
Date: Fri, 14 Jul 2017 08:14:09 -0700
Subject: [PATCH] Make characterToSegmentSet use a lookup table

---
 right/src/led_display.c | 118 ++++++++++++++++------------------------
 1 file changed, 46 insertions(+), 72 deletions(-)

diff --git a/right/src/led_display.c b/right/src/led_display.c
index c86ca16..b83264c 100644
--- a/right/src/led_display.c
+++ b/right/src/led_display.c
@@ -2,80 +2,54 @@
 #include "slave_drivers/slave_driver_led_driver.h"
 #include "layer.h"
 
+static const uint16_t capitalLetterToSegmentSet[] = {
+    0b0000000011110111,
+    0b0001001010001111,
+    0b0000000000111001,
+    0b0001001000001111,
+    0b0000000011111001,
+    0b0000000011110001,
+    0b0000000010111101,
+    0b0000000011110110,
+    0b0001001000001001,
+    0b0000000000001110,
+    0b0011011000000000,
+    0b0000000000111000,
+    0b0000010100110110,
+    0b0010000100110110,
+    0b0000000000111111,
+    0b0000000011110011,
+    0b0010000000111111,
+    0b0010000011110011,
+    0b0000000011101101,
+    0b0001001000000001,
+    0b0000000000111110,
+    0b0000110000110000,
+    0b0010100000110110,
+    0b0010110100000000,
+    0b0001010100000000,
+    0b0000110000001001,
+};
+
+static const uint16_t digitToSegmentSet[] = {
+    0b0000110000111111,
+    0b0000010000000110,
+    0b0000100010001011,
+    0b0000000011001111,
+    0b0000000011100110,
+    0b0010000001101001,
+    0b0000000011110111,
+    0b0000000000000111,
+    0b0000000011111111,
+    0b0000000011101111,
+};
+
 static uint16_t characterToSegmentSet(char character) {
     switch (character) {
-    case 'A':
-        return 0b0000000011110111;
-    case 'B':
-        return 0b0001001010001111;
-    case 'C':
-        return 0b0000000000111001;
-    case 'D':
-        return 0b0001001000001111;
-    case 'E':
-        return 0b0000000011111001;
-    case 'F':
-        return 0b0000000011110001;
-    case 'G':
-        return 0b0000000010111101;
-    case 'H':
-        return 0b0000000011110110;
-    case 'I':
-        return 0b0001001000001001;
-    case 'J':
-        return 0b0000000000001110;
-    case 'K':
-        return 0b0011011000000000;
-    case 'L':
-        return 0b0000000000111000;
-    case 'M':
-        return 0b0000010100110110;
-    case 'N':
-        return 0b0010000100110110;
-    case 'O':
-        return 0b0000000000111111;
-    case 'P':
-        return 0b0000000011110011;
-    case 'Q':
-        return 0b0010000000111111;
-    case 'R':
-        return 0b0010000011110011;
-    case 'S':
-        return 0b0000000011101101;
-    case 'T':
-        return 0b0001001000000001;
-    case 'U':
-        return 0b0000000000111110;
-    case 'V':
-        return 0b0000110000110000;
-    case 'W':
-        return 0b0010100000110110;
-    case 'X':
-        return 0b0010110100000000;
-    case 'Y':
-        return 0b0001010100000000;
-    case 'Z':
-        return 0b0000110000001001;
-    case '0':
-        return 0b0000110000111111;
-    case '1':
-        return 0b0000010000000110;
-    case '2':
-        return 0b0000100010001011;
-    case '3':
-        return 0b0000000011001111;
-    case '4':
-        return 0b0000000011100110;
-    case '5':
-        return 0b0010000001101001;
-    case '6':
-        return 0b0000000011110111;
-    case '7':
-        return 0b0000000000000111;
-    case '8':
-        return 0b0000000011111111;
-    case '9':
-        return 0b0000000011101111;
+    case 'A' ... 'Z':
+        return capitalLetterToSegmentSet[character - 'A'];
+    case '0' ... '9':
+        return digitToSegmentSet[character - '0'];
     }
     return 0;
 }