From d6231ece77e0b4f29037927d30646eeaef33f813 Mon Sep 17 00:00:00 2001
From: dakkar <dakkar@thenautilus.net>
Date: Fri, 28 Aug 2020 18:45:37 +0100
Subject: sounds not-completely terrible

---
 esp32/lego-piano.ino | 26 ++++++++++++++------------
 1 file changed, 14 insertions(+), 12 deletions(-)

diff --git a/esp32/lego-piano.ino b/esp32/lego-piano.ino
index 88b6520..c6d33b8 100644
--- a/esp32/lego-piano.ino
+++ b/esp32/lego-piano.ino
@@ -46,7 +46,7 @@ portMUX_TYPE timerMux = portMUX_INITIALIZER_UNLOCKED;
 tsf* g_TinySoundFont = 0;
 bool playing = false;
 
-RingBuf<short, 1000> buffer;
+RingBuf<short, 500> buffer;
 
 void IRAM_ATTR onTimer() {
   if (!g_TinySoundFont) return;
@@ -83,13 +83,14 @@ void setup() {
 
   g_TinySoundFont = tsf_load_memory(SoundFont, sizeof(SoundFont));
   if (g_TinySoundFont) {
-    // render at 20kHz
-    tsf_set_output(g_TinySoundFont, TSF_MONO, 20000, 0);
+    // render at 5kHz
+    tsf_set_output(g_TinySoundFont, TSF_MONO, 5000, 0);
 
-    // pre-scaling by 4k, then calling on every 1 tick, should give us 20kHz
-    timer = timerBegin(0, 1000, true);
+    // pre-scaling a 40MHz clock by 4k, then calling on every 2 tick,
+    // should give us 5kHz
+    timer = timerBegin(0, 4000, true);
     timerAttachInterrupt(timer, &onTimer, true);
-    timerAlarmWrite(timer, 4, true);
+    timerAlarmWrite(timer, 2, true);
     timerAlarmEnable(timer);
   }
   else {
@@ -148,6 +149,8 @@ int sense(int led) {
   return value < 500;
 }
 
+short intermediateBuffer[5000];
+
 void loop() {
 #if DEBUG & 0x01
   Serial.print("current led ");
@@ -164,7 +167,7 @@ void loop() {
       pressed[currentLed]=1; // mark it pressed
       if (g_TinySoundFont) {
         // start the note
-        tsf_note_on(g_TinySoundFont, 0, 60 + currentLed, 1.0f);
+        tsf_note_on(g_TinySoundFont, 0, 36 + currentLed, 1.0f);
       }
     }
   }
@@ -176,19 +179,18 @@ void loop() {
     pressed[currentLed]=0; // mark it no longer pressed
     if (g_TinySoundFont) {
       // stop the note
-      tsf_note_off(g_TinySoundFont, 0, 60 + currentLed);
+      tsf_note_off(g_TinySoundFont, 0, 36 + currentLed);
     }
   }
 
   currentLed = (currentLed+1)%(row_count*col_count);
 
   int toFill = buffer.maxSize() - buffer.size();
-  if (toFill) {
+  if (toFill > 100) {
+    tsf_render_short(g_TinySoundFont, intermediateBuffer, toFill, 0);
     noInterrupts();
     for (int i=0;i<toFill;++i) {
-      short sample;
-      tsf_render_short(g_TinySoundFont, &sample, 1, 0);
-      buffer.push(sample);
+      buffer.push(intermediateBuffer[i]);
     }
     interrupts();
   }
-- 
cgit v1.2.3