From 338c66152fd4f53178383144d9341c68313f64ce Mon Sep 17 00:00:00 2001
From: Oleksiy H <oleksiy@sitkainstruments.com>
Date: Mon, 20 Oct 2025 01:35:17 +0300
Subject: [PATCH] Got rid of MCP4725 library. For now MCP4725 DACs used only
 for gate signals, CV will be back with another DAC

---
 AciduinoCV.ino | 23 ++++++++++++++---------
 CV.ino         | 37 +++++++++++++++++++++++++++++++------
 config.h       |  3 +--
 3 files changed, 46 insertions(+), 17 deletions(-)

diff --git a/AciduinoCV.ino b/AciduinoCV.ino
index 7b81c46..9c385ad 100644
--- a/AciduinoCV.ino
+++ b/AciduinoCV.ino
@@ -5,13 +5,8 @@
 
 #include <Arduino.h>
 #include <Wire.h>
-#include "MCP4725.h"
-
 #include "config.h"
 
-MCP4725 DAC1(DAC_1_ADDR);
-MCP4725 DAC2(DAC_2_ADDR);
-
 bool updateCV1 = true;
 bool updateCV2 = true;
 bool sendGate1 = false;
@@ -19,6 +14,8 @@ bool sendGate2 = false;
 uint8_t CV1Note;
 uint8_t CV2Note;
 
+float DACNoteStep;
+
 void setup() 
 {
   // AcidStepSequencer Interface
@@ -32,12 +29,20 @@ void setup()
   // last pattern user had load before power off
   loadLastPattern();
 
+  DACNoteStep = (1.0 / 12.0) * 4096 / DAC_MAX_VOLTAGE;
+
   Wire.begin();
   Wire.setClock(400000);
-  DAC1.begin();
-  DAC2.begin();
-  DAC1.setMaxVoltage(5.1);
-  DAC2.setMaxVoltage(5.1);
+  Wire.beginTransmission(0x60);
+  Wire.write(0x40);
+  Wire.write(0x00);
+  Wire.write(0x00);
+  Wire.endTransmission();
+  Wire.beginTransmission(0x61);
+  Wire.write(0x40);
+  Wire.write(0x00);
+  Wire.write(0x00);
+  Wire.endTransmission();
 }
 
 // User interaction goes here
diff --git a/CV.ino b/CV.ino
index c13f802..807470f 100644
--- a/CV.ino
+++ b/CV.ino
@@ -3,6 +3,11 @@ float noteToVoltage(uint8_t note) {
   return voltage;
 }
 
+uint16_t noteToValue(uint8_t note) {
+  uint16_t value = (note - 24) * DACNoteStep;
+  return value;
+}
+
 void sendCVNote(uint8_t note, uint8_t track) {
   if (track == 0 && note != CV1Note) {
     CV1Note = note;
@@ -34,29 +39,49 @@ void sendGateOff(uint8_t track) {
 
 void sendVoltage(uint8_t voltage, uint8_t dac) {
   if (dac == 0) {
-    DAC1.setVoltage(voltage);
+    //DAC1.setVoltage(voltage);
   } else {
-    DAC2.setVoltage(voltage);
+    //DAC2.setVoltage(voltage);
   }
 }
 
 void processCV() {
   if (updateCV1) {
-    sendVoltage(noteToVoltage(CV1Note), 0);
-    updateCV1 = false;
+    //sendVoltage(noteToVoltage(CV1Note), 0);
+    //updateCV1 = false;
   }
   if (updateCV2) {
     //sendVoltage(noteToVoltage(CV2Note), 1);
     //updateCV2 = false;
   }
   if (sendGate1) {
-    sendVoltage(5, 1);
+    Wire.beginTransmission(0x60);
+    Wire.write(0x40);
+    Wire.write(0xFF);
+    Wire.write(0xF0);
+    Wire.endTransmission();
+    //sendVoltage(5, 0);
   } else {
-    sendVoltage(0, 1);
+    Wire.beginTransmission(0x60);
+    Wire.write(0x40);
+    Wire.write(0x00);
+    Wire.write(0x00);
+    Wire.endTransmission();
+    //sendVoltage(0, 0);
   }
   if (sendGate2) {
+    Wire.beginTransmission(0x61);
+    Wire.write(0x40);
+    Wire.write(0xFF);
+    Wire.write(0xF0);
+    Wire.endTransmission();
     //sendVoltage(5, 1);
   } else {
+    Wire.beginTransmission(0x60);
+    Wire.write(0x40);
+    Wire.write(0x00);
+    Wire.write(0x00);
+    Wire.endTransmission();
     //sendVoltage(0, 1);
   }
 }
\ No newline at end of file
diff --git a/config.h b/config.h
index ee2466d..1f643f1 100644
--- a/config.h
+++ b/config.h
@@ -93,7 +93,6 @@ typedef enum {
 } BUTTON_HARDWARE_INTERFACE;
 
 // CV DACs
-#define DAC_1_ADDR 0x60
-#define DAC_2_ADDR 0x61
+#define DAC_MAX_VOLTAGE 5.1
 
 #endif