Added single pixel turn on

README.md

@@ -1,25 +1,3 @@
-LedControl
+LedControl fork
 ==========
-LedControl is an [Arduino](http://arduino.cc) library for MAX7219 and MAX7221 Led display drivers.
-The code also works with the [Teensy (3.1)](https://www.pjrc.com/teensy/)
-
-Documentation
--------------
-Documentation for the library is on the [Github Project Pages](http://wayoda.github.io/LedControl/)
-
-Download
---------
-The lastest binary version of the Library is always available from the 
-[LedControl Release Page](https://github.com/wayoda/LedControl/releases) 
-
-
-Install
--------
-The library can be installed using the [standard Arduino library install procedure](http://arduino.cc/en/Guide/Libraries)  
-
-
-
-
-
-
-
+Original project https://github.com/wayoda/LedControl go there

src/LedControl.cpp

@@ -206,6 +206,19 @@ void LedControl::spiTransfer(int addr, volatile byte opcode, volatile byte data)
         shiftOut(SPI_MOSI,SPI_CLK,MSBFIRST,spidata[i-1]);
     //latch the data onto the display
     digitalWrite(SPI_CS,HIGH);
-}    
+}
+
+void LedControl::SetPixelOn(unsigned char dispnum, unsigned char r,unsigned char c,unsigned char intensity){
+  unsigned char row = 0;
+  this->setIntensity(dispnum,intensity);
+  while(row <r){
+    this->setRow(dispnum,row,0);
+    ++row;
+  }
+  this->setRow(dispnum,r,1<<c); ++row;
+  while(row <8){
+    this->setRow(dispnum,row,0); ++row;
+  }
+}
 
 

src/LedControl.h

@@ -182,6 +182,16 @@ class LedControl {
          * dp	sets the decimal point.
          */
         void setChar(int addr, int digit, char value, boolean dp);
+
+        /* 
+         * Turn on a pixel in a defined position row,column
+         * Params:
+         * addr	address of the display
+         * row	row index 0...7
+         * col	columns index 0...7
+         * intensity	set the intensity 0...15
+         */
+	void SetPixelOn(unsigned char dispnum, unsigned char r,unsigned char c,unsigned char intensity);
 };
 
 #endif	//LedControl.h