Diff: WS2812.h

Revision:

0:f1e39d76fbca

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/WS2812.h	Wed Nov 18 14:00:44 2015 +0000
@@ -0,0 +1,37 @@
+#include "mbed.h"
+
+#ifndef WS2812_H
+#define WS2812_H
+
+#define WS2812_LED_NUM_LEDS 30
+#define WS2812_LED_NUM_RESET_BYTES 3
+
+typedef struct
+{
+  uint8_t r;
+  uint8_t g;
+  uint8_t b;
+} Color;
+ 
+class WS2812 {
+public:
+    WS2812(SPI &spi, event_callback_t led_update_strip_finished);
+    
+    void update_strip();
+    void set_led(int led_number, Color *c);
+    void set_all(Color *c);
+
+private:
+    SPI _spi;
+    int _led_data_size;
+    event_callback_t _led_update_strip_finished;
+    
+    void _write_color_to_memory(uint8_t* tuple, uint8_t color_value);
+    
+    // Each sent bit to the LED strip is represented by 4 bits in memory.
+    // Each LED requires 24 bits (8 bits per color).
+    // In addition, we need to allocate room to send enough zeros so that the strip latches
+    uint8_t _led_data[WS2812_LED_NUM_LEDS*12 + WS2812_LED_NUM_RESET_BYTES];
+};
+
+#endif
\ No newline at end of file