From a17cefb4ba833bc6ac88525a072eec5f0a185bf6 Mon Sep 17 00:00:00 2001
From: Sebastian <hi@jbbth.net>
Date: Fri, 30 May 2025 01:54:45 +0200
Subject: [PATCH] Codec ok, transients are quite rounded. Maybe hardware, maybe
 codec settings.

---
 soundcube-i2s-test/soundcube-i2s-test.ino | 51 +++++++++++------------
 1 file changed, 24 insertions(+), 27 deletions(-)

diff --git a/soundcube-i2s-test/soundcube-i2s-test.ino b/soundcube-i2s-test/soundcube-i2s-test.ino
index 0baee99..c760646 100644
--- a/soundcube-i2s-test/soundcube-i2s-test.ino
+++ b/soundcube-i2s-test/soundcube-i2s-test.ino
@@ -14,18 +14,14 @@ int16_t volume = 0;
 size_t count;
 
 void codec_transmit() {
+  for(int i = 0; i < count; i++){
+    buffer[i] *= -1;
+  }
   i2s.write((const uint8_t *)&buffer, count * sizeof(int16_t));
 }
 
 void codec_receive(){
   count = i2s.read((uint8_t *)&buffer, SIZE * sizeof(int16_t)) * sizeof(uint32_t) / sizeof(int16_t);
-  size_t index = 0;
-  volume = 0;
-  while (index < count) {
-    volume += buffer[index];
-    buffer[index] = 0;
-    index++;
-  }
 }
 
 void cw(unsigned char first, unsigned char second){
@@ -95,18 +91,20 @@ void setup() {
 
   // POWER and CM
   cw(0x00, 0x01); // select page 1
-  cw(0x01, 0x08); // disable weak (crude) AVdd connection to DVdd
-  cw(0x02, 0x01); // enable internal AVdd LDO and enable analog blocks
+  cw(0x01, 0b00001000); // disable weak (crude) AVdd connection to DVdd
+  cw(0x02, 0b00000001); // enable internal AVdd LDO and enable analog blocks
   cw(0x09, 0b00001100); // power up LOL, LOR, power down MAL, MAR, HPL, HPR
-  cw(0x0a, 0b01000000); // set full chip CM to 0.75V
-  cw(0x47, 0b00110010); // analog input quick charge time 6.4ms
+  cw(0x0a, 0b00001000); // set full chip CM to 0.75V
+  cw(0x47, 0b00110011); // analog input quick charge time 1.6ms
 
   // ROUTING
   cw(0x00, 0x01); // select page 1
   cw(0x34, 0b11000000); // LEFT MICPGA P route IN1L to LEFT_P with 40k input impedance
   cw(0x36, 0b11000000); // LEFT MICPGA M route CM to LEFT_M with 20k input impedance
+  //cw(0x36, 0b00000011); // LEFT MICPGA M route CM to LEFT_M with 20k input impedance
   cw(0x37, 0b11000000); // RIGHT MICPGA P route IN1R to RIGHT_P with 20k input impedance
   cw(0x39, 0b11000000); // RIGHT MICPGA M route CM to RIGHT_M with 20k input impedance
+  //cw(0x39, 0b00000011); // RIGHT MICPGA M route CM to RIGHT_M with 20k input impedance
   cw(0x3a, 0b00111100); // connect IN2, IN3 weakly to CM
 
   // GAIN
@@ -123,11 +121,12 @@ void setup() {
   cw(0x00, 0x00); // select page 0
   cw(0x12, 0x81); // NADC 1
   cw(0x13, 0x82); // MADC 2
-  cw(0x14, 0x80); // OSR ADC 128
-  cw(0x3d, 0b00000001); // ADC PRB_R3 = 11, PRB_R2 = 10, PRB_R1 = 01
+  cw(0x14, 0b10000000); // OSR ADC 128
+  //cw(0x14, 0b01000000); // OSR ADC 128
+  cw(0x3d, 0b00000010); // ADC PRB_R3 = 11, PRB_R2 = 10, PRB_R1 = 01
 
   cw(0x00, 0x01); // select page 1
-  cw(0x3d, 0b01100100); // ADC PTM_R3
+  cw(0x3d, 0b00000000); // ADC PTM_R4
 
   // DAC
   cw(0x00, 0x00); // select page 0
@@ -136,24 +135,22 @@ void setup() {
   cw(0x0d, 0x00); // OSR DAC 128
   cw(0x0e, 0x80); // OSR DAC 128
   cw(0x1b, 0b00000000); // word length 16bits
-  cw(0x3c, 0x08); // PRB_P8
+  cw(0x3c, 0b00000011); // PRB_P3
 
   cw(0x00, 0x01); // select page 1
-  cw(0x7b, 0x01); // set REF charging time to 40ms
-  //cw(0x14, 0x25); // set HP soft stepping for anti pop
-  //cw(0x0a, 0x0B); // set input CM to 0.9V and LO to 1.65V
+  cw(0x7b, 0b00000001); // set REF charging time to 40ms
   
   // ROUTING
   cw(0x00, 0x01); // select page 1
   cw(0x0e, 0b00001000); // left DAC reconstruction filter routed to LOL
   cw(0x0f, 0b00001000); // right DAC reconstruction filter routed to LOR
-  cw(0x03, 0b00000100); // DAC PTM_P3/4
-  cw(0x04, 0b00000100); // DAC PTM_P3/4
+  cw(0x03, 0b00000000); // DAC PTM_P3/4
+  cw(0x04, 0b00000000); // DAC PTM_P3/4
 
   // LO GAIN
   cw(0x00, 0x01);
-  cw(0x12, 0b00000010); // LOL gain 0dB
-  cw(0x13, 0b00000010); // LOR gain 0dB
+  cw(0x12, 0b00000001); // LOL gain 0dB
+  cw(0x13, 0b00000001); // LOR gain 0dB
 
   // POWER UP
   // ADC
@@ -183,8 +180,8 @@ void setup() {
   Serial.println("P0_42 - Sticky Flags");
   cr(0x2A, 1);
 
-  //i2s.onTransmit(codec_transmit);
-  //i2s.onReceive(codec_receive);
+  i2s.onTransmit(codec_transmit);
+  i2s.onReceive(codec_receive);
 
   i2s.setDOUT(15);
   i2s.setDIN(14);
@@ -195,7 +192,7 @@ void setup() {
   i2s.swapClocks();
   i2s.setBitsPerSample(16);
 
-  //i2s.setBuffers(6, SIZE * sizeof(int16_t) / sizeof(uint32_t));
+  i2s.setBuffers(6, SIZE * sizeof(int16_t) / sizeof(uint32_t));
 
   if(!i2s.begin(48000)){
     Serial.println("I2S error!");
@@ -207,13 +204,13 @@ int32_t last = 0;
 int frame = 0;
 void loop() {
   int16_t l, r;
-  i2s.read16(&l, &r);
+  //i2s.read16(&l, &r);
 
   // float sine_pos = (2.0f * M_PI * 1000.0f * (float)frame) / (float)48000;
   // l = (int16_t)(sin(sine_pos) * 8192.0f);
   // r = l;
 
-  i2s.write16(l*-1, r*-1);
+  //i2s.write16(l*-1, r*-1);
 
   // volume += l + r;
   // if(millis() - last > 1000){