Added full RP2040 (RPi Pico) support

.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:
@@ -9,3 +24,4 @@ compile:
     - esp32
     # - esp8266
     # - mega2560
+    # - rpipico

MCP_DAC.cpp

@@ -70,6 +70,19 @@ void MCP_DAC::begin(uint8_t select)
       mySPI->end();
       mySPI->begin(18, 19, 23, select);   // CLK=18 MISO=19 MOSI=23
     }
+
+    #elif defined(ARDUINO_ARCH_RP2040)
+
+    if (_useSPI1 == true) {
+      mySPI = &SPI1;
+    }else{
+      mySPI = &SPI;
+    }
+
+    mySPI->end();
+    mySPI->begin();
+
+
     #else              // generic hardware SPI
     mySPI = &SPI;
     mySPI->end();
@@ -85,8 +98,7 @@ void MCP_DAC::begin(uint8_t select)
   }
 }
 
-
-#if defined(ESP32)
+#if defined(ESP32) or defined(ARDUINO_ARCH_RP2040)
 void MCP_DAC::setGPIOpins(uint8_t clk, uint8_t miso, uint8_t mosi, uint8_t select)
 {
   _clock   = clk;
@@ -96,7 +108,20 @@ void MCP_DAC::setGPIOpins(uint8_t clk, uint8_t miso, uint8_t mosi, uint8_t selec
   digitalWrite(_select, HIGH);
 
   mySPI->end();  // disable SPI
+
+  #if defined(ESP32)
+
   mySPI->begin(clk, miso, mosi, select);
+
+  #elif defined(ARDUINO_ARCH_RP2040)
+
+  mySPI->setCS(select);
+  mySPI->setSCK(clk);
+  mySPI->setTX(mosi);
+
+  mySPI->begin();
+
+  #endif
 }
 #endif
 

MCP_DAC.h

@@ -13,7 +13,7 @@
 #include "SPI.h"
 
 
-#define MCP_DAC_LIB_VERSION       (F("0.1.6"))
+#define MCP_DAC_LIB_VERSION       (F("0.1.7"))
 
 
 
@@ -74,47 +74,77 @@ class MCP_DAC
   void     reset();
   bool     usesHWSPI() { return _hwSPI; };
 
-  // ESP32 specific
-  #if defined(ESP32)
+
+  #if defined(ESP32)                    // ESP32 specific
+
   void     selectHSPI() { _useHSPI = true;  };
   void     selectVSPI() { _useHSPI = false; };
   bool     usesHSPI()   { return _useHSPI;  };
   bool     usesVSPI()   { return !_useHSPI; };
 
-  // to overrule ESP32 default hardware pins
+  // to overrule the ESP32s default hardware pins
+  void     setGPIOpins(uint8_t clk, uint8_t miso, uint8_t mosi, uint8_t select);
+
+
+  #elif defined(ARDUINO_ARCH_RP2040)    // RP2040 specific
+
+  // check which SPI-Bus (SPI or SPI1) is used
+  void     selectSPI()  { _useSPI1 = false;  };
+  void     selectSPI1() { _useSPI1 = true; };
+  bool     usesSPI()    { return !_useSPI1;  };
+  bool     usesSPI1()   { return _useSPI1;  };
+
+  // to overrule the RP2040s default hardware pins
   void     setGPIOpins(uint8_t clk, uint8_t miso, uint8_t mosi, uint8_t select);
+
   #endif
 
+
 protected:
-  uint8_t  _dataOut;
-  uint8_t  _clock;
-  uint8_t  _select;
-  uint8_t  _latchPin = 255;
-  bool     _hwSPI;
-  uint32_t _SPIspeed = 16000000;
-
-  uint8_t  _channels;
-  uint16_t _maxValue;
-  uint16_t _value[2];
-  uint8_t  _gain;
-  bool     _buffered = false;
+  uint8_t  _dataOut;                // Data out Pin (MOSI)
+  uint8_t  _clock;                  // Clock Pin (SCK)
+  uint8_t  _select;                 // Chip Select Pin (CS)
+  uint8_t  _latchPin = 255;         // Latch-DAC Pin (LDAC)
+  bool     _hwSPI;                  // Hardware SPI (true) or Software SPI (false)
+  uint32_t _SPIspeed = 16000000;    // SPI-Bus Frequency
+
+  uint8_t  _channels;               // Number of DAC-Channels of a given Chip
+  uint16_t _maxValue;               // maximum value of a given Chip
+  uint16_t _value[2];               // Current value
+  uint8_t  _gain;                   // Programmable Gain Amplifier variable
+  bool     _buffered = false;       // Buffer for the Reference Voltage of the MCP49XX Series Chips
   bool     _active   = true;
 
   void     transfer(uint16_t data);
   uint8_t  swSPI_transfer(uint8_t d);
 
+  #if defined(ARDUINO_ARCH_RP2040)
+
+  SPIClassRP2040 * mySPI;
+
+  #else
+
   SPIClass    * mySPI;
+
+  #endif
+
   SPISettings _spi_settings;
 
   #if defined(ESP32)
+
   bool        _useHSPI = true;
+
+  #elif defined(ARDUINO_ARCH_RP2040)
+
+  bool _useSPI1 = false;
+
   #endif
 };
 
 
 ///////////////////////////////////////////////////////////////
 //
-// 4800 Series
+// MCP4800 Series
 //
 class MCP4801 : public MCP_DAC
 {
@@ -160,7 +190,7 @@ class MCP4822 : public MCP_DAC
 
 ///////////////////////////////////////////////////////////////
 //
-// 4900 Series
+// MCP4900 Series
 //
 class MCP4901 : public MCP_DAC
 {

README.md

@@ -160,6 +160,48 @@ SPI0 and SPI1 are used to access flash memory. SPI2 and SPI3 are "user" SPI cont
 | not used |  MISO   = 12  |  MISO   = 19  |
 
 
+
+### RP2040 specific
+
+Select SPI bus on which the Device is on. Both need to be called before the **begin()** function. If the function is called after the **begin()** function, changes will only apply if the **end()** and then the **begin()** functions are called 
+
+- **void selectSPI()** Select the SPI bus (Standard, does not need to be called)
+- **void selectSPI1()** Select the SPI1 bus
+
+- **bool usesSPI()** returns true if SPI is used
+- **bool usesSPI1()** returns true if SPI1 is used
+
+#### experimental
+
+- **void setGPIOpins(uint8_t clk, uint8_t miso, uint8_t mosi, uint8_t select)** overrule GPIO pins of RP2040 for different SPI pins. needs to be called 
+AFTER the **begin()** function. Selcted pins must match the RP2040 pinout!
+
+
+```cpp
+void setup()
+{
+  MCP.selectSPI();    //use for SPI / SPI0
+  MCP.selectSPI1();   //use for SPI1
+  MCP.begin(17);
+  MCP.setGPIOpins(CLK, MISO, MOSI, SELECT);  // SELECT should match the param of begin()
+}
+```
+
+#### Pico connections to MCP4922 (example)
+
+The RP2040 has **two** SPI peripherals from which two can be used.
+
+SPI (SPI0) and SPI1 can both be usd to connect devices
+
+
+| MCP4922  |   SPI / SPI0  |      SPI1     |
+|:--------:|:-------------:|:-------------:|
+|  CS      |  SELECT = 17  |  SELECT = 13  | 
+|  SCK     |  SCLK   = 18  |  SCLK   = 14  | 
+|  SDI     |  MOSI   = 19  |  MOSI   = 15  | 
+| not used |  MISO   = 16  |  MISO   = 12  |
+
+
 ## Future
 
 - test test test and ....

examples/MCP4921_wave_generator_RP2040/.arduino-ci.yml

@@ -0,0 +1,27 @@
+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:
+    # - uno
+    # - due
+    # - zero
+    # - leonardo
+    # - m4
+    # - esp32
+    # - esp8266
+    # - mega2560
+    - rpipico