From cdcd6c3680a5d676f68e09780232bc70a37d18ec Mon Sep 17 00:00:00 2001
From: dakkar <dakkar@thenautilus.net>
Date: Fri, 21 Aug 2020 14:44:55 +0100
Subject: maybe make it play a sound

also, all the pins
---
 esp32/lego-piano.ino | 84 ++++++++++++++++++++++++++++++++++++++--------------
 1 file changed, 62 insertions(+), 22 deletions(-)

diff --git a/esp32/lego-piano.ino b/esp32/lego-piano.ino
index d67a75a..bd1236b 100644
--- a/esp32/lego-piano.ino
+++ b/esp32/lego-piano.ino
@@ -16,19 +16,65 @@
   so that given one of 12|13 and one of 14|15, one LED is identified
  */
 
+#include <driver/dac.h>
+
+hw_timer_t * timer = NULL;
+portMUX_TYPE timerMux = portMUX_INITIALIZER_UNLOCKED;
+
+bool play = false;
+int wave_pos = 0;
+int wave_period = 1000;
+
+// stupid square wave
+int wave() {
+  if (wave_pos < wave_period/2) {
+    return 255;
+  }
+  else {
+    return 0;
+  }
+}
+
+void IRAM_ATTR onTimer() {
+  portENTER_CRITICAL_ISR(&timerMux);
+
+  if (play) {
+    dac_output_voltage(DAC_CHANNEL_1, wave());
+    wave_pos = (wave_pos+1)%wave_period;
+  }
+
+  portEXIT_CRITICAL_ISR(&timerMux);
+}
+
+
 int currentLed = 0;
 int lastSeen = 100;
 
+const int rows[] = { 5, 23, 19, 18, 26 };
+const int cols[] = { 34, 33, 35, 21, 22 };
+const int adc[] = { 2, 4, 12, 27, 14 };
+const int ampEnable = 32;
+
 void setup() {
   Serial.begin(19200);
-  pinMode(12, OUTPUT);
-  pinMode(13, OUTPUT);
-  pinMode(14, OUTPUT);
-  pinMode(15, OUTPUT);
-  pinMode(A1, INPUT);
-  pinMode(A2, INPUT);
+
+  pinMode(ampEnable, OUTPUT);
+
+  for (int i=0;i<5;++i) {
+    pinMode(rows[i], OUTPUT);
+    pinMode(cols[i], OUTPUT);
+    pinMode(adc[i], INPUT);
+  }
+
   currentLed = 0;
   lastSeen = 100;
+
+  timer = timerBegin(0, 2, true); // use a prescaler of 2
+  timerAttachInterrupt(timer, &onTimer, true);
+  timerAlarmWrite(timer, 5000, true);
+  timerAlarmEnable(timer);
+
+  play=true;
 }
 
 void tristate(int pin) {
@@ -48,32 +94,26 @@ void ground(int pin) {
 }
 
 void enableLed(int led) {
-  int row = led/2;
-  int col = led%2;
+  int row = led/5;
+  int col = led%5;
   /* Serial.print("enabling "); */
   /* Serial.print(row); */
   /* Serial.print(" "); */
   /* Serial.println(col); */
 
-  if (row==0) {
-    power(12); ground(13);
-  }
-  else {
-    ground(12); power(13);
-  }
+  for (int i=0;i<5;++i) {
+    if (i==row) { power(rows[i]); }
+    else { ground(rows[i]); }
 
-  if (col==0) {
-    ground(14); tristate(15);
-  }
-  else {
-    tristate(14); ground(15);
+    if (i==col) { ground(cols[i]); }
+    else { tristate(cols[i]); }
   }
 }
 
 int sense(int led) {
-  int row = led/2;
+  int row = led/5;
 
-  int value = analogRead(row == 0 ? A1 : A2);
+  int value = analogRead(adc[row]);
 
   //Serial.println(value);
   return value < 500;
@@ -96,5 +136,5 @@ void loop() {
     lastSeen = 100;
   }
 
-  currentLed = (currentLed+1)%4;
+  currentLed = (currentLed+1)%25;
 }
\ No newline at end of file
-- 
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