Diff: Mcp4921.cpp

Revision:

0:38e03f9fa18a

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Mcp4921.cpp	Fri Nov 15 14:53:04 2013 +0000
@@ -0,0 +1,80 @@
+#include "Mcp4921.h"
+
+Mcp4921::Mcp4921(PinName _mosi,PinName _sck,PinName _cs, int _frequency):mySPI(_mosi,NC,_sck),myCs(_cs)
+{
+    myFrequency=_frequency;
+
+    setup();
+}
+//---------------------------------------
+int Mcp4921::getFrequency(void)
+{
+    return myFrequency;
+}
+//--------------------------------------
+void Mcp4921::write(int dataIntNum)
+{
+ //valid input values are 0 - 4095.   4096 should scale to Vref.   
+    char i=0;
+
+    if(dataIntNum >4095)
+        dataIntNum=4095;
+
+    if(dataIntNum <0)
+        dataIntNum=0;
+
+    int16_t temp=0;
+    temp=dataIntNum | 0x7000;
+
+    myCs=0;
+    for(i=0; i<50; i++);
+    mySPI.write(temp);
+
+    for(i=0; i<50; i++);
+    myCs=1;
+}
+//--------------------------------------
+void Mcp4921::write_mV(int millivolt){
+    
+    if(millivolt >3300)
+        millivolt=3300;
+        
+    if(millivolt <0)
+        millivolt=0;
+        
+  int val=(millivolt*4095)/3300;
+  
+  write(val);      
+}
+//--------------------------------------
+void Mcp4921::write(float dataFloat)
+{
+//valid input values are 0.0 - 1.0   with 1.0 should scale to Vref.   
+    if(dataFloat >1.0)
+        dataFloat=1.0;
+
+    if(dataFloat <0)
+        dataFloat=0;
+
+    float temp=4095*dataFloat;
+
+    write((int)temp);
+}
+//--------------------------------------
+void Mcp4921::operator=(int dataIntNum)
+{
+    write(dataIntNum);
+}
+//--------------------------------------
+void Mcp4921::operator=(float dataFloat)
+{
+    write(dataFloat);
+}
+//--------------------------------------
+void Mcp4921::setup(void)
+{
+    myCs=1;
+    mySPI.frequency(myFrequency);  //
+    mySPI.format(16,0);       //16 bits + mode 0
+}
+//
\ No newline at end of file