make the cycle pausable

nametag/src/enums.cpp

@@ -0,0 +1,21 @@
+#include "enums.h"
+#include "constants.h"
+DisplayStyle next_style(DisplayStyle style) {
+    switch(style) {
+        case Rain:
+          return Congress;
+          break;
+        case Congress:
+          return Supercomputer;
+          break;
+        case Supercomputer:
+          return Cyber;
+          break;
+        case Cyber:
+          return Flame;
+          break;
+        case Flame:
+          return Rain;
+          break;
+    }
+}

nametag/src/main.cpp

@@ -20,6 +20,7 @@ Mode mode = HighVis;
 DisplayStyle style = Rain;
 
 unsigned long last_switch;
+bool cycling = true;
 
 void setup(){
   pinMode(ONBOARD_LED, OUTPUT);
@@ -52,9 +53,8 @@ void setup(){
 void loop() {
   matrix ->flipDMABuffer();
   matrix->clearScreen();
-  //delay(25);
 
-  if (millis() - last_switch > CYCLE_TIME_MS) {
+  if (cycling and millis() - last_switch > CYCLE_TIME_MS) {
     // next style
     style = next_style(style); //DisplayStyle((style + 1) % (NumStyles - 1)); 
     last_switch = millis();
@@ -76,8 +76,15 @@ void loop() {
   }
 
   if(!digitalRead(NEXT_BUTTON)) {
-    style = next_style(style);
+    unsigned long pressed_at = millis();
     while(!digitalRead(NEXT_BUTTON)); // Wait for release
+    // see if the button was held or tapped
+    if (millis() - pressed_at > 500) {
+        // todo
+        cycling = not cycling;
+    } else {
+        style = next_style(style);
+    }
   }
 
   switch(style) {