adds ws2812 driver for arm

drivers/arm/ws2812.h

@@ -0,0 +1,94 @@
+/*
+
+  WS2812B CPU and memory efficient library
+
+  Date: 28.9.2016
+
+  Author: Martin Hubacek
+  	  	  http://www.martinhubacek.cz
+  	  	  @hubmartin
+
+  Licence: MIT License
+
+*/
+
+#ifndef WS2812B_H_
+#define WS2812B_H_
+#include "ws2812.h"
+
+// GPIO enable command
+#define WS2812B_GPIO_CLK_ENABLE() __HAL_RCC_GPIOC_CLK_ENABLE()
+// LED output port
+#define WS2812B_PORT GPIOC
+// LED output pins
+#define WS2812B_PINS (GPIO_PIN_0 | GPIO_PIN_1 | GPIO_PIN_2 | GPIO_PIN_3)
+// How many LEDs are in the series
+#define WS2812B_NUMBER_OF_LEDS 60
+
+// Number of output LED strips. Each has its own buffer.
+#define WS2812_BUFFER_COUNT 2
+
+// Choose one of the bit-juggling setpixel implementation
+// *******************************************************
+//#define SETPIX_1	// For loop, works everywhere, slow
+//#define SETPIX_2	// Bit band in a loop
+//#define SETPIX_3	// Like SETPIX_1 but with unrolled loop
+#define SETPIX_4	// Fastest copying using bit-banding
+
+
+// DEBUG OUTPUT
+// ********************
+#define LED4_PORT GPIOC
+#define LED4_PIN GPIO_PIN_10
+
+#define LED5_PORT GPIOC
+#define LED5_PIN GPIO_PIN_10
+
+
+// Public functions
+// ****************
+void ws2812b_init();
+void ws2812b_handle();
+
+// Library structures
+// ******************
+// This value sets number of periods to generate 50uS Treset signal
+#define WS2812_RESET_PERIOD 12
+
+typedef struct WS2812_BufferItem {
+	uint8_t* frameBufferPointer;
+	uint32_t frameBufferSize;
+	uint32_t frameBufferCounter;
+	uint8_t channel;	// digital output pin/channel
+} WS2812_BufferItem;
+
+
+
+typedef struct WS2812_Struct
+{
+	WS2812_BufferItem item[WS2812_BUFFER_COUNT];
+	uint8_t transferComplete;
+	uint8_t startTransfer;
+	uint32_t timerPeriodCounter;
+	uint32_t repeatCounter;
+} WS2812_Struct;
+
+WS2812_Struct ws2812b;
+
+// Bit band stuff
+#define RAM_BASE 0x20000000
+#define RAM_BB_BASE 0x22000000
+#define Var_ResetBit_BB(VarAddr, BitNumber) (*(volatile uint32_t *) (RAM_BB_BASE | ((VarAddr - RAM_BASE) << 5) | ((BitNumber) << 2)) = 0)
+#define Var_SetBit_BB(VarAddr, BitNumber) (*(volatile uint32_t *) (RAM_BB_BASE | ((VarAddr - RAM_BASE) << 5) | ((BitNumber) << 2)) = 1)
+#define Var_GetBit_BB(VarAddr, BitNumber) (*(volatile uint32_t *) (RAM_BB_BASE | ((VarAddr - RAM_BASE) << 5) | ((BitNumber) << 2)))
+#define BITBAND_SRAM(address, bit) ( (__IO uint32_t *) (RAM_BB_BASE + (((uint32_t)address) - RAM_BASE) * 32 + (bit) * 4))
+
+#define varSetBit(var,bit) (Var_SetBit_BB((uint32_t)&var,bit))
+#define varResetBit(var,bit) (Var_ResetBit_BB((uint32_t)&var,bit))
+#define varGetBit(var,bit) (Var_GetBit_BB((uint32_t)&var,bit))
+
+static void ws2812b_set_pixel(uint8_t row, uint16_t column, uint8_t red, uint8_t green, uint8_t blue);
+void DMA_TransferCompleteHandler(DMA_HandleTypeDef *DmaHandle);
+void DMA_TransferHalfHandler(DMA_HandleTypeDef *DmaHandle);
+
+#endif /* WS2812B_H_ */