Diff: ShiftBrite.cpp

Revision:

0:466ea48e852a

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ShiftBrite.cpp	Mon Nov 03 05:21:08 2014 +0000
@@ -0,0 +1,64 @@
+#include "mbed.h"
+#include "ShiftBrite.h"
+
+
+ShiftBrite::ShiftBrite(PinName latch, PinName enable,SPI& spi) : _spi(spi), _latch(latch), _enable(enable) {
+    //Recomended Calabration levels for Brightness
+    blue_level = green_level = 100;
+    red_level = 120;    //red has a larger range of brightness than the others
+    init();
+}
+
+void ShiftBrite::init(void) {
+    
+    Brightness(red_level,green_level,blue_level);
+    
+    _spi.format(16,0);
+    _spi.frequency(500000);
+    _red = 255;        //White
+    _green = 255;
+    _blue = 255;
+}
+
+void ShiftBrite::Write(int red,int green,int blue) {  //can hold up to 10 bits for each color
+    _red = red;
+    _green = green;
+    _blue = blue;
+    
+    unsigned int low_color=0;
+    unsigned int high_color=0;
+    
+    high_color=((_blue&0x3FF)<<4)|((_red&0x3C0)>>6);  //00bb bbbb bbbb rrrr
+    low_color=(((_red&0x3F)<<10)|_green);     //rrrr rrgg gggg gggg
+    
+    
+    _spi.write(high_color);
+    _spi.write(low_color);
+    
+    _enable=1; //resync PWM counters - might flash without this with fast color updates
+    _latch=1;
+    wait(.000015);
+    _latch=0;
+    _enable=0;
+    wait(.005);
+    
+}
+
+//Change Brightness scaling levels
+void ShiftBrite::Brightness(int redLevel,int greenLevel,int blueLevel) { // Levels can be 50..1023
+    //Command for Brightness
+    unsigned int Init_Command = 0x40000000;
+    
+    Init_Command = Init_Command|(blueLevel<<20)|(redLevel<<10)|greenLevel;
+    _spi.write(Init_Command >> 16&0xFFFF);
+    _spi.write(Init_Command &0xFFFF);
+    
+    wait(.000015);
+    _latch=1;
+    _enable =1;
+    wait(.000015);
+    _latch=0;
+    _enable=0;
+    
+
+}