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/*
* WS2812.h
*
* Created on: 2 May 2021
* Author: Ralim
*/
#include "Pins.h"
#include "Setup.h"
#include <stddef.h>
#include <stdint.h>
#include <string.h>
#ifndef CORE_DRIVERS_WS2812_H_
#define CORE_DRIVERS_WS2812_H_
#ifndef WS2812_LED_CHANNEL_COUNT
#define WS2812_LED_CHANNEL_COUNT 3
#endif
#define WS2812_RAW_BYTES_PER_LED (WS2812_LED_CHANNEL_COUNT * 8)
template <uint32_t LED_GPIO, uint16_t LED_PIN, int LED_COUNT> class WS2812 {
private:
uint8_t leds_colors[WS2812_LED_CHANNEL_COUNT * LED_COUNT];
public:
void led_update() {
__disable_irq();
// Bitbang it out as our cpu irq latency is too high
for (unsigned int i = 0; i < sizeof(leds_colors); i++) {
// Shove out MSB first
for (int x = 0; x < 8; x++) {
((GPIO_TypeDef *)WS2812_GPIO_Port)->BSRR = WS2812_Pin;
if ((leds_colors[i] & (1 << (7 - x))) == (1 << (7 - x))) {
__asm__ __volatile__("nop");
__asm__ __volatile__("nop");
__asm__ __volatile__("nop");
__asm__ __volatile__("nop");
__asm__ __volatile__("nop");
__asm__ __volatile__("nop");
__asm__ __volatile__("nop");
__asm__ __volatile__("nop");
__asm__ __volatile__("nop");
__asm__ __volatile__("nop");
__asm__ __volatile__("nop");
__asm__ __volatile__("nop");
__asm__ __volatile__("nop");
__asm__ __volatile__("nop");
__asm__ __volatile__("nop");
__asm__ __volatile__("nop");
__asm__ __volatile__("nop");
__asm__ __volatile__("nop");
__asm__ __volatile__("nop");
__asm__ __volatile__("nop");
__asm__ __volatile__("nop");
__asm__ __volatile__("nop");
__asm__ __volatile__("nop");
__asm__ __volatile__("nop");
__asm__ __volatile__("nop");
__asm__ __volatile__("nop");
__asm__ __volatile__("nop");
__asm__ __volatile__("nop");
__asm__ __volatile__("nop");
__asm__ __volatile__("nop");
} else {
__asm__ __volatile__("nop");
__asm__ __volatile__("nop");
__asm__ __volatile__("nop");
__asm__ __volatile__("nop");
__asm__ __volatile__("nop");
__asm__ __volatile__("nop");
}
((GPIO_TypeDef *)WS2812_GPIO_Port)->BSRR = (uint32_t)WS2812_Pin << 16u;
__asm__ __volatile__("nop");
__asm__ __volatile__("nop");
__asm__ __volatile__("nop");
__asm__ __volatile__("nop");
__asm__ __volatile__("nop");
__asm__ __volatile__("nop");
__asm__ __volatile__("nop");
__asm__ __volatile__("nop");
__asm__ __volatile__("nop");
__asm__ __volatile__("nop");
__asm__ __volatile__("nop");
__asm__ __volatile__("nop");
__asm__ __volatile__("nop");
__asm__ __volatile__("nop");
__asm__ __volatile__("nop");
__asm__ __volatile__("nop");
__asm__ __volatile__("nop");
__asm__ __volatile__("nop");
__asm__ __volatile__("nop");
__asm__ __volatile__("nop");
__asm__ __volatile__("nop");
__asm__ __volatile__("nop");
__asm__ __volatile__("nop");
__asm__ __volatile__("nop");
__asm__ __volatile__("nop");
__asm__ __volatile__("nop");
__asm__ __volatile__("nop");
}
}
__enable_irq();
}
void init(void) { memset(leds_colors, 0, sizeof(leds_colors)); }
void led_set_color(size_t index, uint8_t r, uint8_t g, uint8_t b) {
leds_colors[index * WS2812_LED_CHANNEL_COUNT + 0] = g;
leds_colors[index * WS2812_LED_CHANNEL_COUNT + 1] = r;
leds_colors[index * WS2812_LED_CHANNEL_COUNT + 2] = b;
}
void led_set_color_all(uint8_t r, uint8_t g, uint8_t b) {
for (int index = 0; index < LED_COUNT; index++) {
leds_colors[index * WS2812_LED_CHANNEL_COUNT + 0] = g;
leds_colors[index * WS2812_LED_CHANNEL_COUNT + 1] = r;
leds_colors[index * WS2812_LED_CHANNEL_COUNT + 2] = b;
}
}
};
#endif /* CORE_DRIVERS_WS2812_H_ */
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