Implement a slowing countdown on button request

code/code.ino

@@ -8,25 +8,58 @@
 #include "uniform_int_dist.h"
 
 
-#define PIN1 1
+#define BUTTON_PIN 1
+#define DISPLAY_ENABLE 3
 
 lcg_rng rng;
 std::uniform_int_distribution<uint8_t> distribution(1,16);
 
 SegmentDisplay<4, 2, 0> display;
 
+#define NUM_SLOWDOWN 12
+const uint16_t PROGMEM SLOWDOWN[NUM_SLOWDOWN] = {
+    35, 32,
+    20, 64,
+     8, 125,
+     4, 250,
+     2, 500,
+     2, 1000
+};
+
 void setup() {
-    pinMode(PIN1, INPUT_PULLUP);
-    pinMode(3, OUTPUT);
-    digitalWrite(3, 0);
-    digitalWrite(0, 0);
+    pinMode(BUTTON_PIN, INPUT_PULLUP);
+
+    pinMode(DISPLAY_ENABLE, OUTPUT);
+    digitalWrite(DISPLAY_ENABLE, 0);
+
+    display.setDash();
+    display.write();
 }
 
 void loop() {
-    if(!digitalRead(PIN1)) {
-        display.set(distribution(rng));
-        display.write();
+    if(digitalRead(PIN1)) {
+        rng();
+        return;
+    }
+
+    uint8_t num;
+
+    for(size_t i = 0; i < NUM_SLOWDOWN; i += 2) {
+        for(size_t j = 0; j < pgm_read_word_near(SLOWDOWN + i); ++j) {
+            num = distribution(rng);
+            display.set(num);
+            display.write();
+            delay(pgm_read_word_near(SLOWDOWN + i + 1));
+        }
+    }
+
+    for(uint8_t i = 0; i < 2; ++i) {
+        display.setOff();
+        display.write();
+        delay(250);
+        display.set(num);
+        display.write();
+        delay(250);
     }
-    delay(16);
 }
 

code/segment.h

@@ -36,6 +36,11 @@ public:
         number[1] = 0xFF;
     }
 
+    void setDash() {
+        number[0] = pgm_read_byte_near(DECODER + 11);
+        number[1] = pgm_read_byte_near(DECODER + 11);
+    }
+
     void write() {
         shiftOut(PIN_SER, PIN_SCLK, LSBFIRST, number[0]);
         shiftOut(PIN_SER, PIN_SCLK, LSBFIRST, number[1]);