Revision 0:9bd76a5655fa, committed 2012-04-30

Comitter:

wsalis01

Date:

Mon Apr 30 00:37:45 2012 +0000

Commit message:

Initial Commit.

Changed in this revision

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/DigitalPotentiometer.cpp	Mon Apr 30 00:37:45 2012 +0000
@@ -0,0 +1,82 @@
+#include "DigitalPotentiometer.h"
+
+DigitalPotentiometer::DigitalPotentiometer(PinName csPin) : _spi(p5, p6, p7), _cs(csPin)
+{
+	_cs = 0;
+
+	//Increase the frequency when external pull ups are used
+    _spi.format(8,3);
+    _spi.frequency(1000000);
+}
+
+int DigitalPotentiometer::increment() {
+	_cs = 1;
+	
+	//  send in the address and value via SPI:
+	char ret1 = _spi.write(0x04);
+
+	_cs = 0;
+	return ret1;
+}
+
+int DigitalPotentiometer::decrement() {
+	_cs = 1;
+	
+	//  send in the address and value via SPI:
+	char ret1 = _spi.write(0x08);
+	
+	_cs = 0;
+	return ret1;
+}
+
+int DigitalPotentiometer::readTCON() {
+	_cs = 1;
+	
+	//  send in the address and value via SPI:
+	char ret1 = _spi.write(0x4C);
+	char ret2 = _spi.write(0x00);
+	
+	_cs = 0;
+	return ret1;
+}
+
+int DigitalPotentiometer::initTCON() {
+	_cs = 1;
+	
+	//  send in the address and value via SPI:
+	char ret1 = _spi.write(0x41);
+	char ret2 = _spi.write(0x0F);
+	
+	_cs = 0;
+	return ret1;
+}
+
+int DigitalPotentiometer::readStatus() {
+	_cs = 1;
+	
+	//  send in the address and value via SPI:
+	char ret1 = _spi.write(0x5C);
+	char ret2 = _spi.write(0x00);
+	
+	_cs = 0;
+	return ret1;
+}
+
+int DigitalPotentiometer::setTap(int value) {
+	_cs = 1;
+
+	//  send in the address and value via SPI:
+	char h = 0x03 & (value >> 8);
+	char l = 0x00FF & value;
+	
+	//Serial.print("HIGH: ");
+	//Serial.println(h, BIN);
+	//Serial.print("LOW: ");
+	//Serial.println(l, BIN);
+	
+	char ret1 = _spi.write(h);
+	char ret2 = _spi.write(l);
+
+	_cs = 0;	
+	return (ret1 << 8) | ret2;
+}
\ No newline at end of file

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/DigitalPotentiometer.h	Mon Apr 30 00:37:45 2012 +0000
@@ -0,0 +1,31 @@
+#ifndef DigitalPotentiometer_h
+#define DigitalPotentiometer_h
+
+#include "mbed.h"
+
+#define MOSI	11
+#define MISO	12
+#define SCK		13
+
+#define DigitalPotentiometer_MIN 0
+#define DigitalPotentiometer_MAX 256
+
+class DigitalPotentiometer
+{
+public:
+    DigitalPotentiometer(PinName csPin);
+	int initTCON();
+	int readTCON();
+	int readStatus();
+	int increment();
+	int decrement();
+	int setTap(int value);
+	
+private:
+    SPI _spi;
+    DigitalOut _cs;
+	void enable();
+	void disable();
+};
+
+#endif