diff --git a/libraries/DAC8552/.arduino-ci.yml b/libraries/DAC8552/.arduino-ci.yml
index e7cb4633..10c0e10b 100644
--- a/libraries/DAC8552/.arduino-ci.yml
+++ b/libraries/DAC8552/.arduino-ci.yml
@@ -1,3 +1,18 @@
+platforms:
+  rpipico:
+    board: rp2040:rp2040:rpipico
+    package: rp2040:rp2040
+    gcc:
+      features:
+      defines:
+        - ARDUINO_ARCH_RP2040
+      warnings:
+      flags:
+
+packages:
+  rp2040:rp2040:
+    url: https://github.com/earlephilhower/arduino-pico/releases/download/global/package_rp2040_index.json
+
 compile:
   # Choosing to run compilation tests on 2 different Arduino platforms
   platforms:
@@ -8,4 +23,6 @@ compile:
     - m4
     - esp32
     # - esp8266
-    # - mega2560
\ No newline at end of file
+    # - mega2560
+    - rpipico
+
diff --git a/libraries/DAC8552/CHANGELOG.md b/libraries/DAC8552/CHANGELOG.md
new file mode 100644
index 00000000..06600f6e
--- /dev/null
+++ b/libraries/DAC8552/CHANGELOG.md
@@ -0,0 +1,44 @@
+# Change Log DAC8552
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](http://keepachangelog.com/)
+and this project adheres to [Semantic Versioning](http://semver.org/).
+
+
+## [0.2.4] - 2022-10-30
+- add changelog.md
+- add rp2040 to build-CI
+
+
+## [0.2.3] - 2021-12-15
+- update library.json
+- update license
+- update unit test
+- minor edits
+
+## [0.2.2] - 2021-08-29
+- add support for HSPI / VSPI ESP32 ++
+
+## [0.2.1] - 2021-06-02
+- compile ESP32 + fix for channel B
+
+## [0.2.0] - 2020-12-18
+- add arduino-ci + unit test
+- add slave select pin for HW constructor
+
+----
+
+## [0.1.3] - 2020-06-07
+- fix library.json
+
+## [0.1.2] - 2020-04-06
+- minor refactor
+- update readme.md
+
+## [0.1.1] - 2017-12-19
+- fix begin() bug
+
+## [0.1.0] - 2017-12-14
+- initial version
+
diff --git a/libraries/DAC8552/DAC8552.cpp b/libraries/DAC8552/DAC8552.cpp
index 98bae4b5..3b61c2be 100644
--- a/libraries/DAC8552/DAC8552.cpp
+++ b/libraries/DAC8552/DAC8552.cpp
@@ -2,19 +2,10 @@
 //    FILE: DAC8552.cpp 
 //  AUTHOR: Rob Tillaart
 // PURPOSE: Arduino library for DAC8552 SPI Digital Analog Convertor
-// VERSION: 0.2.3
+// VERSION: 0.2.4
 //     URL: https://github.com/RobTillaart/DAC8552
 //
-// HISTORY:
-//  0.1.0:  2017-12-14  initial version
-//  0.1.1:  2017-12-19  fix begin() bug
-//  0.1.2   2020-04-06  minor refactor, readme.md
-//  0.1.3   2020-06-07  fix library.json
-//  0.2.0   2020-12-18  add arduino-ci + unit test
-//                      add slave select pin for HW constructor
-//  0.2.1   2021-06-02  compile ESP32 + fix for channel B
-//  0.2.2   2021-08-29  add support for HSPI / VSPI ESP32 ++
-//  0.2.3   2021-12-15  update library.json, license, unit test, minor edits
+// HISTORY: see changelog.md
 
 
 #include "DAC8552.h"
@@ -40,8 +31,8 @@ DAC8552::DAC8552(uint8_t spiData, uint8_t spiClock, uint8_t slaveSelect)
 }
 
 
-// initializes the SPI
-// and sets internal state
+//  initializes the SPI
+//  and sets internal state
 void DAC8552::begin()
 {
   pinMode(_select, OUTPUT);
@@ -52,26 +43,26 @@ void DAC8552::begin()
   if(_hwSPI)
   {
     #if defined(ESP32)
-    if (_useHSPI)      // HSPI
+    if (_useHSPI)      //  HSPI
     {
       mySPI = new SPIClass(HSPI);
       mySPI->end();
-      mySPI->begin(14, 12, 13, _select);   // CLK=14 MISO=12 MOSI=13
+      mySPI->begin(14, 12, 13, _select);   //  CLK=14  MISO=12  MOSI=13
     }
-    else               // VSPI
+    else               //  VSPI
     {
       mySPI = new SPIClass(VSPI);
       mySPI->end();
-      mySPI->begin(18, 19, 23, _select);   // CLK=18 MISO=19 MOSI=23
+      mySPI->begin(18, 19, 23, _select);   //  CLK=18  MISO=19  MOSI=23
     }
-    #else              // generic hardware SPI
+    #else              //  generic hardware SPI
     mySPI = &SPI;
     mySPI->end();
     mySPI->begin();
     #endif
     delay(1);
   }
-  else                 // software SPI
+  else                 //  software SPI
   {
     pinMode(_dataOut, OUTPUT);
     pinMode(_clock, OUTPUT);
@@ -95,14 +86,14 @@ void DAC8552::setGPIOpins(uint8_t clk, uint8_t miso, uint8_t mosi, uint8_t selec
   pinMode(_select, OUTPUT);
   digitalWrite(_select, HIGH);
 
-  mySPI->end();  // disable SPI 
+  mySPI->end();  //  disable SPI 
   mySPI->begin(clk, miso, mosi, select);
 }
 #endif
 
 
-// channel = 0, 1, 2, 3 depending on type
-// value = 0..65535
+//  channel = 0, 1, 2, 3 depending on type
+//  value = 0..65535
 void DAC8552::bufferValue(uint8_t channel, uint16_t value)
 {
   _value[channel] = value;
@@ -110,8 +101,8 @@ void DAC8552::bufferValue(uint8_t channel, uint16_t value)
 }
 
 
-// channel = 0, 1, 2, 3 depending on type
-// value = 0..65535
+//  channel = 0, 1, 2, 3 depending on type
+//  value = 0..65535
 void DAC8552::setValue(uint8_t channel, uint16_t value)
 {
   _value[channel] = value;
@@ -119,8 +110,8 @@ void DAC8552::setValue(uint8_t channel, uint16_t value)
 }
 
 
-// channel = 0, 1, 2, 3 depending on type
-// returns 0..65535
+//  channel = 0, 1, 2, 3 depending on type
+//  returns 0..65535
 uint16_t DAC8552::getValue(uint8_t channel)
 {
   return _value[channel];
@@ -158,12 +149,12 @@ void DAC8552::setSPIspeed(uint32_t speed)
 
 //////////////////////////////////////////////////////////////////
 //
-// PRIVATE
+//  PRIVATE
 //
 
-// channel = 0, 1, 2, 3 depending on type
-// direct = true  ==> write buffers to both channel A and channel B
-// direct = false ==> buffer value
+//  channel = 0, 1, 2, 3 depending on type
+//  direct = true  ==> write buffers to both channel A and channel B
+//  direct = false ==> buffer value
 void DAC8552::updateDevice(uint8_t channel, bool directWrite)
 {
   uint8_t configRegister = _register[channel];
@@ -188,7 +179,7 @@ void DAC8552::updateDevice(uint8_t channel, bool directWrite)
 }
 
 
-// simple one mode version
+//  simple one mode version
 void DAC8552::swSPI_transfer(uint8_t value)
 {
   uint8_t clk = _clock;
diff --git a/libraries/DAC8552/DAC8552.h b/libraries/DAC8552/DAC8552.h
index 1d9ddeb1..61b83ae7 100644
--- a/libraries/DAC8552/DAC8552.h
+++ b/libraries/DAC8552/DAC8552.h
@@ -3,7 +3,7 @@
 //    FILE: DAC8552.h
 //  AUTHOR: Rob Tillaart
 // PURPOSE: Arduino library for DAC8552 SPI Digital Analog Convertor  
-// VERSION: 0.2.3
+// VERSION: 0.2.4
 // HISTORY: See DAC8552.cpp
 //     URL: https://github.com/RobTillaart/DAC8552
 //
@@ -13,7 +13,7 @@
 #include "SPI.h"
 
 
-#define DAC8552_LIB_VERSION           (F("0.2.3"))
+#define DAC8552_LIB_VERSION           (F("0.2.4"))
 
 
 #define DAC8552_POWERDOWN_NORMAL      0
@@ -44,14 +44,14 @@ public:
 
   bool     usesHWSPI() { return _hwSPI; };
 
-  // ESP32 specific
+  //  ESP32 specific
   #if defined(ESP32)
   void     selectHSPI() { _useHSPI = true;  };
   void     selectVSPI() { _useHSPI = false; };
   bool     usesHSPI()   { return _useHSPI;  };
   bool     usesVSPI()   { return !_useHSPI; };
 
-  // to overrule ESP32 default hardware pins
+  //  to overrule ESP32 default hardware pins
   void     setGPIOpins(uint8_t clk, uint8_t miso, uint8_t mosi, uint8_t select);
   #endif
 
diff --git a/libraries/DAC8552/README.md b/libraries/DAC8552/README.md
index 748fc1d9..5ce1313a 100644
--- a/libraries/DAC8552/README.md
+++ b/libraries/DAC8552/README.md
@@ -75,10 +75,6 @@ but waits until (TODO CHECK DATASHEET)
 | DAC8552_POWERDOWN_HIGH_IMP |   3   |
 
 
-## Future
-
-- testing
-
 
 ## Operation
 
@@ -101,3 +97,8 @@ See examples
 **demo_powerdown.ino**
 - idem
 
+
+## Future
+
+- testing
+
diff --git a/libraries/DAC8552/library.json b/libraries/DAC8552/library.json
index 5fc26e42..520acb95 100644
--- a/libraries/DAC8552/library.json
+++ b/libraries/DAC8552/library.json
@@ -15,7 +15,7 @@
     "type": "git",
     "url": "https://github.com/RobTillaart/DAC8552"
   },
-  "version": "0.2.3",
+  "version": "0.2.4",
   "license": "MIT",
   "frameworks": "arduino",
   "platforms": "*",
diff --git a/libraries/DAC8552/library.properties b/libraries/DAC8552/library.properties
index ee62e889..788e0339 100644
--- a/libraries/DAC8552/library.properties
+++ b/libraries/DAC8552/library.properties
@@ -1,5 +1,5 @@
 name=DAC8552
-version=0.2.3
+version=0.2.4
 author=Rob Tillaart <rob.tillaart@gmail.com>
 maintainer=Rob Tillaart <rob.tillaart@gmail.com>
 sentence=Arduino library for DAC8552 SPI Digital Analog Convertor