From d43141350ca5255eb5af00e57a6afb75d41521b0 Mon Sep 17 00:00:00 2001
From: dakkar <dakkar@thenautilus.net>
Date: Sat, 22 Aug 2020 14:47:20 +0100
Subject: generalise the code a bit

---
 esp32/lego-piano.ino | 62 +++++++++++++++++++++++++++++++++-------------------
 1 file changed, 39 insertions(+), 23 deletions(-)

diff --git a/esp32/lego-piano.ino b/esp32/lego-piano.ino
index 4a88556..29368e6 100644
--- a/esp32/lego-piano.ino
+++ b/esp32/lego-piano.ino
@@ -19,13 +19,19 @@
 #include <driver/dac.h>
 
 int currentLed = 0;
-int lastSeen = 100;
+int lastSeen = -1;
 
-const int rows[] = { 5, 23, 19, 18, 26 };
-const int cols[] = { 7, 33, 8, 21, 22 };
-const int adc[] = { 2, 4, 12, 27, 14 };
+#define DEBUG 0
+
+const size_t row_count = 5;
+const size_t col_count = 5;
+
+const int rows[row_count] = { 5, 23, 19, 18, 26 };
+const int cols[col_count] = { 7, 33, 8, 21, 22 };
+const int adc[row_count] = { 2, 4, 12, 27, 14 };
 const int ampEnable = 32;
 
+const int octave_shift = 4;
 
 void setup() {
   Serial.begin(115200);
@@ -36,15 +42,16 @@ void setup() {
   dac_i2s_disable();
   dac_output_enable(DAC_CHANNEL_1);
 
-  for (int i=0;i<5;++i) {
+  for (int i=0;i<row_count;++i) {
     pinMode(rows[i], OUTPUT|PULLUP);
-    pinMode(cols[i], OUTPUT|PULLDOWN);
     pinMode(adc[i], INPUT);
   }
+  for (int i=0;i<col_count;++i) {
+    pinMode(cols[i], OUTPUT|PULLDOWN);
+  }
 
   currentLed = 0;
-  lastSeen = 100;
-
+  lastSeen = -1;
 }
 
 void play(uint32_t freq) {
@@ -52,7 +59,7 @@ void play(uint32_t freq) {
   en_ch: DAC_CHANNEL_1,
   scale: DAC_CW_SCALE_2,
   phase: DAC_CW_PHASE_0,
-  freq: freq,
+  freq: octave_shift*freq,
   offset: 0,
   };
 
@@ -84,28 +91,35 @@ void ground(int pin) {
 }
 
 void enableLed(int led) {
-  int row = led/5;
-  int col = led%5;
-  /* Serial.print("enabling "); */
-  /* Serial.print(row); */
-  /* Serial.print(" "); */
-  /* Serial.println(col); */
-
-  for (int i=0;i<5;++i) {
+  int row = (led/col_count) % row_count ;
+  int col = led%col_count;
+
+#if DEBUG & 0x02
+  Serial.print("enabling ");
+  Serial.print(row);
+  Serial.print(" ");
+  Serial.println(col);
+#endif
+
+  for (int i=0;i<row_count;++i) {
     if (i==row) { power(rows[i]); }
     else { ground(rows[i]); }
-
+  }
+  for (int i=0;i<col_count;++i) {
     if (i==col) { ground(cols[i]); }
     else { tristate(cols[i]); }
   }
 }
 
 int sense(int led) {
-  int row = led/5;
+  int row = (led/col_count)%row_count;
 
   int value = analogRead(adc[row]);
 
+#if DEBUG & 0x04
   Serial.println(value);
+#endif
+
   return value < 500;
 }
 
@@ -140,8 +154,10 @@ uint32_t notes[] = {
 };
 
 void loop() {
-  /* Serial.print("current led "); */
-  /* Serial.println(currentLed); */
+#if DEBUG & 0x01
+  Serial.print("current led ");
+  Serial.println(currentLed);
+#endif
 
   enableLed(currentLed);
   delay(5);
@@ -154,9 +170,9 @@ void loop() {
     }
   }
   else if (lastSeen == currentLed) {
-    lastSeen = 100;
+    lastSeen = -1;
     mute();
   }
 
-  currentLed = (currentLed+1)%10;
+  currentLed = (currentLed+1)%(row_count*col_count);
 }
\ No newline at end of file
-- 
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