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#pragma once
#include <stdint.h>
#include <stdlib.h>
#define WIRE_BYTES_PER_COLOR 9
#define PADDING_BYTES 1
#define TOTAL_BYTES_PER_LED (PADDING_BYTES + WIRE_BYTES_PER_COLOR)
enum ws2812b_byte_order {
BYTE_ORDER_RGB = 0,
BYTE_ORDER_GBR = 1,
};
struct ws2812b_buf {
uint8_t* buf; /* Size of the buffer. */
size_t total_alloc; /* total number of bytes allocated to the buffer. */
size_t cur; /* Current output cursor in the buffer */
/* The byte order this driver should use. WS2811's use BGR, WS2812b's use GBR.
*/
enum ws2812b_byte_order byte_order;
/* pointer to the dma_now register. needed to synchronize with the DMA. */
volatile uint16_t* dma_now_reg;
/* pointer to the dma_end register. */
volatile uint16_t* dma_end_reg;
};
struct rgb_compiled {
union {
struct __attribute__((packed)) {
uint32_t first_bits;
uint32_t second_bits;
uint8_t last_bits;
};
uint8_t buf[9];
};
};
typedef struct {
union {
struct __attribute__((packed)) {
uint8_t r;
uint8_t g;
uint8_t b;
};
uint32_t color;
};
} rgb_t;
int write_rgb(struct ws2812b_buf* out, rgb_t color);
void start_dma(struct ws2812b_buf* buf);
void make_wsb2812b(struct ws2812b_buf* out, void* buf, size_t n_alloc);
void compile_color(
rgb_t color, struct rgb_compiled* out, enum ws2812b_byte_order byte_order);
// ch must have at least 73 characters free.
void compiled_color_dbg_str(struct rgb_compiled* c, char* out);
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