Diff: ADC0848.cpp

Revision:

0:a76d9079d07b

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ADC0848.cpp	Mon Oct 07 21:49:38 2013 +0000
@@ -0,0 +1,93 @@
+#include "ADC0848.h"
+
+
+unsigned char A2DValue[8] = {0,0,0,0,0,0,0,0};
+
+//ADC0848 Class Constructor for polling A2D using int ADC0848::Poll_A2D(unsigned char Channel)
+ADC0848::ADC0848(PinName pin1, PinName pin2, PinName pin3, PinName pin4, PinName pin5, PinName pin6, PinName pin7, PinName pin8, PinName pin9, PinName pin10, PinName pin11) 
+								:_DataBus(pin1,pin2,pin3,pin4,pin5,pin6,pin7,pin8), _WR(pin9), _RD(pin10),_intS(NC),_intP(pin11)
+{
+	_WR = 1;
+	_RD = 1;
+  _intP.mode(PullUp);	
+	_scan = false;
+}
+//ADC0848 Class Constructor for scanning all channels of continues using interrupts A2D vales can be using int ADC0848::GetA2D(unsigned char Channel)
+//char ADC0848::Start_Scan() must be called to start a conversion
+ADC0848::ADC0848(PinName pin1, PinName pin2, PinName pin3, PinName pin4, PinName pin5, PinName pin6, PinName pin7, PinName pin8, PinName pin9, PinName pin10, PinName pin11,bool Scan) 
+								:_DataBus(pin1,pin2,pin3,pin4,pin5,pin6,pin7,pin8), _WR(pin9), _RD(pin10),_intS(pin11),_intP(NC), _scan(Scan)
+{
+	_WR = 1;
+	_RD = 1;
+  _intS.mode(PullUp);
+	_intS.fall_add(this,&ADC0848::DIGI_IO_ISR);		
+}
+
+
+void ADC0848::DIGI_IO_ISR() // ISR used if in scanning mode to scan the 8 channels of the ADC  The values are stored in unsigned char A2DValue[8]
+{
+	static unsigned char channel_num=0;
+  _DataBus.input();
+	_RD = 0;
+	A2DValue[channel_num] = _DataBus;
+	_RD = 1;
+	channel_num++;
+	if(channel_num > 7)
+		 channel_num=0;
+	_DataBus.output();
+	_DataBus=0x08 | channel_num;
+	_WR = 0;
+	_WR = 1;
+}
+
+int ADC0848::Start_Scan()  
+{
+ if(_scan)
+ {
+	_DataBus.output(); //start 1st conversion 
+	_DataBus=0x08;
+	_WR = 0;
+	_WR = 1;
+	return(1);
+ }
+ else
+ {
+	return(-1);
+ }
+}
+
+int ADC0848::GetA2D(unsigned char Channel)  //Returns the Value of the the channel requested when in scanning mode.  If not in scanning mode the function returns -1
+{
+		if(_scan)
+		{
+	   return((int)A2DValue[Channel]);
+		}
+		else
+		{
+			return(-1);
+		}
+}
+
+int ADC0848::Poll_A2D(unsigned char Channel) //Returns the Value of the the channel requested when in polling mode.  If not in polling mode the function returns -1
+{
+	if(!_scan)
+	{
+		char data;
+		_DataBus.output();
+		_DataBus=0x08 | Channel;
+		_WR = 0;
+		_WR = 1;
+		while(_intP);
+		_DataBus.input();
+		_RD = 0;
+		data = _DataBus;
+		_RD = 1;
+		return ((int)data);
+	}
+	else
+	{
+		return(-1);
+	}
+}
+
+