Initial commit

WS2812Serial.cpp

+
+#include "WS2812Serial.h"
+
+void WS2812Serial::begin()
+{
+	if (!uart) return;
+	if (!dma) dma = new DMAChannel;
+	if (!dma) return;
+
+	SIM_SCGC4 |= SIM_SCGC4_UART0;
+	uint32_t divisor = BAUD2DIV(2400000);
+
+	CORE_PIN1_CONFIG = PORT_PCR_DSE | PORT_PCR_SRE | PORT_PCR_MUX(3);
+
+        UART0_BDH = (divisor >> 13) & 0x1F;
+        UART0_BDL = (divisor >> 5) & 0xFF;
+        UART0_C4 = divisor & 0x1F;
+
+	UART0_C1 = 0;
+	UART0_PFIFO = 0;
+	UART0_C2 = UART_C2_TE;
+	UART0_C3 = UART_C3_TXINV;
+	UART0_C5 = UART_C5_TDMAS;
+
+	frameBuffer[0] = 0xDB;
+	frameBuffer[1] = 0xDA;
+	frameBuffer[2] = 0xDB;
+
+	dma->sourceBuffer(frameBuffer, 3);
+	dma->destination(UART0_D);
+	dma->transferSize(1);
+	dma->transferCount(3);
+	dma->disableOnCompletion();
+
+	dma->triggerAtHardwareEvent(DMAMUX_SOURCE_UART0_TX);
+}
+
+void WS2812Serial::show()
+{
+
+	//UART0_D = 0xDB;
+	//UART0_D = 0xDA;
+	//UART0_D = 0xDB;
+	
+	dma->enable();
+	UART0_C2 = UART_C2_TE | UART_C2_TIE;
+
+}
+
+

WS2812Serial.h

+#ifndef WS2812Serial_h_
+#define WS2812Serial_h_
+
+#include <Arduino.h>
+#include "DMAChannel.h"
+
+#define WS2812_RGB      0       // The WS2811 datasheet documents this way
+#define WS2812_RBG      1
+#define WS2812_GRB      2       // Most LED strips are wired this way
+#define WS2812_GBR      3
+#define WS2812_BRG      4
+#define WS2812_BGR      5
+
+class WS2812Serial {
+public:
+	constexpr WS2812Serial(uint16_t n, void *f, void *d, HardwareSerial &s, uint8_t c) :
+		numled(n), config(c),
+		frameBuffer((uint8_t *)f), drawBuffer((uint8_t *)d),
+		uart( &s == &Serial1 ? &KINETISK_UART0 : nullptr)
+	{
+	}
+	void begin();
+	void setPixel(uint32_t num, int color) {
+		if (num >= numled) return;
+		num *= 3;
+		frameBuffer[num+0] = color;
+		frameBuffer[num+1] = color >> 8;
+		frameBuffer[num+2] = color >> 16;
+	}
+	void setPixel(uint32_t num, uint8_t red, uint8_t green, uint8_t blue) {
+		if (num >= numled) return;
+		num *= 3;
+		frameBuffer[num+0] = blue;
+		frameBuffer[num+1] = green;
+		frameBuffer[num+2] = red;
+	}
+	void show();
+	bool busy();
+	uint16_t numPixels() {
+		return numled;
+	}
+private:
+	const uint16_t numled;
+	const uint8_t config;
+	uint8_t *frameBuffer;
+	uint8_t *drawBuffer;
+	//HardwareSerial &serial;
+	KINETISK_UART_t *uart;
+	DMAChannel *dma = nullptr;
+
+};
+
+#endif