Hideki Kozima
Drives a strip of serial RGB LEDs (WS2812) through SPI port (mosi: p5).
Revision 0:f7ac8595c47a, committed 2015-05-23
- Comitter:
- xkozima
- Date:
- Sat May 23 01:31:14 2015 +0000
- Commit message:
- This library drives WS2812 Serial RGB LED strips. See main.cpp as an example usage.
Changed in this revision
diff -r 000000000000 -r f7ac8595c47a BurstSPI.lib --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/BurstSPI.lib Sat May 23 01:31:14 2015 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/Sissors/code/BurstSPI/#bc069279eb37
diff -r 000000000000 -r f7ac8595c47a colors.cpp
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/colors.cpp Sat May 23 01:31:14 2015 +0000
@@ -0,0 +1,52 @@
+#include "mbed.h"
+#include "colors.h"
+
+BurstSPI Spi(p5, p6, p7);
+
+void Colors::setup(int n) {
+ num = n;
+ Spi.frequency(2400000);
+ Spi.format(12);
+}
+
+void Colors::sendOne(unsigned char r, unsigned char g, unsigned char b) {
+ int data;
+ // W2812: g, r, b (0:100, 1:110)
+ // g[7:4] 0000abcdxxxx
+ // 1a01b01c01d0
+ data = ((g & 0x80) << 3) | ((g & 0x40) << 1)
+ | ((g & 0x20) >> 1) | ((g & 0x10) >> 3);
+ Spi.fastWrite(data | 0x924);
+ // g[3:0] 0000xxxxabcd
+ // 1a01b01c01d0
+ data = ((g & 0x08) << 7) | ((g & 0x04) << 5)
+ | ((g & 0x02) << 3) | ((g & 0x01) << 1);
+ Spi.fastWrite(data | 0x924);
+ // r[7:4] 0000abcdxxxx
+ // 1a01b01c01d0
+ data = ((r & 0x80) << 3) | ((r & 0x40) << 1)
+ | ((r & 0x20) >> 1) | ((r & 0x10) >> 3);
+ Spi.fastWrite(data | 0x924);
+ // r[3:0] 0000xxxxabcd
+ // 1a01b01c01d0
+ data = ((r & 0x08) << 7) | ((r & 0x04) << 5)
+ | ((r & 0x02) << 3) | ((r & 0x01) << 1);
+ Spi.fastWrite(data | 0x924);
+ // b[7:4] 0000abcdxxxx
+ // 1a01b01c01d0
+ data = ((b & 0x80) << 3) | ((b & 0x40) << 1)
+ | ((b & 0x20) >> 1) | ((b & 0x10) >> 3);
+ Spi.fastWrite(data | 0x924);
+ // b[3:0] 0000xxxxabcd
+ // 1a01b01c01d0
+ data = ((b & 0x08) << 7) | ((b & 0x04) << 5)
+ | ((b & 0x02) << 3) | ((b & 0x01) << 1);
+ Spi.fastWrite(data | 0x924);
+}
+
+void Colors::send(unsigned char data[][3]) {
+ for (int i = 0; i < num; i++) {
+ sendOne(data[i][0], data[i][1], data[i][2]);
+ }
+ wait_us(50);
+}
diff -r 000000000000 -r f7ac8595c47a colors.h
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/colors.h Sat May 23 01:31:14 2015 +0000
@@ -0,0 +1,11 @@
+#include "mbed.h"
+#include "BurstSPI.h"
+
+class Colors {
+public:
+ void setup(int n);
+ void send(unsigned char data[][3]);
+private:
+ void sendOne(unsigned char r, unsigned char g, unsigned char b);
+ int num;
+};