Diff: Mcp4921.h

Revision:

0:38e03f9fa18a

Child:

1:1352606a60c6

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Mcp4921.h	Fri Nov 15 14:53:04 2013 +0000
@@ -0,0 +1,72 @@
+#ifndef MCP4921_H
+#define MCP4921_H
+
+#include "mbed.h"
+
+/**
+* The MCP4921 is a single 12 bit DAC.
+ The maximum voltage output is limited by the input voltage at V_DD which can go up to about 5.5V.
+
+* Datasheet: http://www.microchip.com/wwwproducts/Devices.aspx?dDocName=en020398
+*
+*/
+
+class Mcp4921
+{
+
+public:
+    /** Initializes the MCP 4921 DAC with the frequency
+    *
+    * for exemple:
+    *   Mbed        Mcp4921
+    * p11: Mosi <--->p4:Sdi
+    * p12: Miso No Connected
+    * p13: Sck  <--->p3:Sck
+    * p14       <--->p2:Cs
+    * Vout      <--->p1:Vdd
+    * Vout      <--->p6: Vref
+    * Gnd       <--->p7:Gnd
+    * Gnd       <--->p5:Ldac
+    */
+    Mcp4921(PinName _mosi,PinName _sck,PinName _cs, int _frequency);
+
+    /** return the frequency use by the Mcp4921
+       */
+    int getFrequency(void);
+
+    /** Writes a value between 0-4095 to the currently selected DAC output
+    * @param dataIntNum a value from 0-4095 to write to the DAC register
+    */
+    void write(int dataIntNum);
+
+    /** Writes a float value between 0.0-1.0 to the currently selected DAC output
+       * @param dataFloat a value from 0.0-1.0 to write to the DAC register
+       */
+    void write(float dataFloat);
+    
+     /** Writes a value in mV to the DAC outputs.
+    * The output will only be accurate if Vref is set to the appropriate voltage reference scaling factor. 
+    * @param millivolt The desired voltage output in millivolts
+    */
+    void write_mV(int millivolt);
+
+    /**An operator for shorthand write(int)
+    */
+    void operator=(int dataIntNum);
+
+
+    /**An operator for shorthand write(float)
+    */
+    void operator=(float dataFloat);
+
+
+protected:
+//
+    void setup(void);
+    SPI mySPI;
+    DigitalOut myCs;
+    int myFrequency;
+
+};
+
+#endif
\ No newline at end of file