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+/* Arduino WaveHC Library
+ * Copyright (C) 2009 by William Greiman
+ *
+ * This file is part of the Arduino WaveHC Library
+ *
+ * This Library is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This Library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with the Arduino WaveHC Library.  If not, see
+ * <http://www.gnu.org/licenses/>.
+ */
+/**
+ *  Macros and inline functions for MCP4921 DAC
+ */
+#ifndef mcpDac_h
+#define mcpDac_h
+
+#include <WavePinDefs.h>
+#include <avr/io.h>
+
+//------------------------------------------------------------------------------
+#define mcpDacCsLow() MCP_DAC_CS_PORT &= ~_BV(MCP_DAC_CS_BIT)
+#define mcpDacCsHigh() MCP_DAC_CS_PORT |= _BV(MCP_DAC_CS_BIT)
+
+#define mcpDacSckLow() MCP_DAC_SCK_PORT &= ~_BV(MCP_DAC_SCK_BIT)
+#define mcpDacSckHigh() MCP_DAC_SCK_PORT |= _BV(MCP_DAC_SCK_BIT)
+#define mcpDacSckPulse()                                                       \
+  {                                                                            \
+    mcpDacSckHigh();                                                           \
+    mcpDacSckLow();                                                            \
+  }
+
+#define mcpDacSdiLow() MCP_DAC_SDI_PORT &= ~_BV(MCP_DAC_SDI_BIT)
+#define mcpDacSdiHigh() MCP_DAC_SDI_PORT |= _BV(MCP_DAC_SDI_BIT)
+#define mcpDacSdiSet(v)                                                        \
+  if (v) {                                                                     \
+    mcpDacSdiHigh();                                                           \
+  } else {                                                                     \
+    mcpDacSdiLow();                                                            \
+  }
+
+// send bit b of d
+#define mcpDacSendBit(d, b)                                                    \
+  {                                                                            \
+    mcpDacSdiSet(d &_BV(b));                                                   \
+    mcpDacSckPulse();                                                          \
+  }
+
+//------------------------------------------------------------------------------
+// init dac I/O ports
+inline void mcpDacInit(void) {
+  // set all to output mode
+  MCP_DAC_CS_DDR |= _BV(MCP_DAC_CS_BIT);
+  MCP_DAC_SCK_DDR |= _BV(MCP_DAC_SCK_BIT);
+  MCP_DAC_SDI_DDR |= _BV(MCP_DAC_SDI_BIT);
+  // chip select high
+  mcpDacCsHigh();
+
+#if USE_MCP_DAC_LDAC
+  // LDAC low always - use unbuffered mode
+  MCP_DAC_LDAC_DDR |= _BV(MCP_DAC_LDAC_BIT);
+  MCP_DAC_LDAC_PORT &= ~_BV(MCP_DAC_LDAC_BIT);
+#endif // USE_MCP_DAC_LDAC
+}
+//------------------------------------------------------------------------------
+// send 12 bits to dac
+// trusted compiler to optimize and it does
+// csLow to csHigh takes 8 - 9 usec on a 16 MHz Arduino
+inline void mcpDacSend(uint16_t data) {
+  mcpDacCsLow();
+  // send DAC config bits
+  mcpDacSdiLow();
+  mcpDacSckPulse(); // DAC A
+  mcpDacSckPulse(); // unbuffered
+  mcpDacSdiHigh();
+  mcpDacSckPulse(); // 1X gain
+  mcpDacSckPulse(); // no SHDN
+  // send 12 data bits
+  mcpDacSendBit(data, 11);
+  mcpDacSendBit(data, 10);
+  mcpDacSendBit(data, 9);
+  mcpDacSendBit(data, 8);
+  mcpDacSendBit(data, 7);
+  mcpDacSendBit(data, 6);
+  mcpDacSendBit(data, 5);
+  mcpDacSendBit(data, 4);
+  mcpDacSendBit(data, 3);
+  mcpDacSendBit(data, 2);
+  mcpDacSendBit(data, 1);
+  mcpDacSendBit(data, 0);
+  mcpDacCsHigh();
+}
+
+#endif // mcpDac_h