Thomas Olsson
Library for controlling LED strips or arrays based on the WS2801 3-Channel Constant Current LED Driver, like the SF 32LED/m addressable LED strip. Any two digital out capable pins can be used for clock & data. also includes a header that defines the standart HTML color names
Diff: ws2801.cpp
- Revision:
- 0:b964d673c7db
- Child:
- 3:2b362d164405
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/ws2801.cpp Tue Jun 14 19:20:50 2011 +0000
@@ -0,0 +1,78 @@
+#include "ws2801.h"
+#include "mbed.h"
+
+
+//------------------------------------------------------------------------------------------------------------
+ws2801::ws2801(PinName CKI, PinName SDI, int STRIP_LENGTH, int reset_delay) : _CKI(CKI), _SDI(SDI), _STRIP_LENGTH(STRIP_LENGTH), _reset_delay(reset_delay)
+{
+_level=100;
+//ws2801.clear();
+for(int bits = 0; bits <= _STRIP_LENGTH*24; bits++)
+ {
+ _CKI = 0;
+ _SDI = 0;
+ _CKI = 1;
+ }
+_CKI = 0;
+wait_us(_reset_delay);
+}
+//------------------------------------------------------------------------------------------------------------
+void ws2801::post(int *strip_colors)
+{
+
+int strip_colors_leveled[_STRIP_LENGTH];
+uint32_t mask;
+
+for(int LED_number = 0 ; LED_number < _STRIP_LENGTH ; LED_number++)
+ {
+ if(_level != 100)
+ {
+ int R = ((strip_colors[LED_number] & 0x00ff0000) >> 16)*_level/100;
+ int G = ((strip_colors[LED_number] & 0x0000ff00) >> 8)*_level/100;
+ int B = (strip_colors[LED_number] & 0x000000ff)*_level/100;
+ strip_colors_leveled[LED_number] = (R << 16)|(G << 8)|B;
+ }
+ else strip_colors_leveled[LED_number] = strip_colors[LED_number];
+ int this_led_color = strip_colors_leveled[LED_number]; //24 bits of color data
+ for(char color_bit = 23 ; color_bit != 255 ; color_bit--)
+ {
+ _CKI = 0;
+ mask = 1 << color_bit;
+ if(this_led_color & mask)_SDI = 1;
+ else _SDI = 0;
+ _CKI = 1; //Data is latched when clock goes high
+ }
+ }
+_CKI = 0;
+wait_us(_reset_delay); //Wait for 1ms to go into reset
+}
+//------------------------------------------------------------------------------------------------------------
+void ws2801::clear(void)
+{
+for(int bits = 0; bits <= _STRIP_LENGTH*24; bits++)
+ {
+ _CKI = 0;
+ _SDI = 0;
+ _CKI = 1;
+ }
+_CKI = 0;
+wait_us(_reset_delay);
+}
+//------------------------------------------------------------------------------------------------------------
+int ws2801::setlevel(int level)
+{
+if((level <= 100) && level)
+ {
+ _level = level;
+ return _level;
+ }
+return 0;
+}
+
+//------------------------------------------------------------------------------------------------------------
+int ws2801::setdelay(int reset_delay)
+{
+if(reset_delay <= 0x0fffffff)_reset_delay = reset_delay;
+return _reset_delay;
+}
+//---------EOF---------------EOF------------------------------------------------------------------------------
\ No newline at end of file