84 lines
2.4 KiB
C++
84 lines
2.4 KiB
C++
/**
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* Copyright (c) 2020 Raspberry Pi (Trading) Ltd.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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/*
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This code is significantly modified from the PIO apa102 example
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found here: https://github.com/raspberrypi/pico-examples/tree/master/pio/apa102
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*/
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#pragma once
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#include <math.h>
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#include <cstdint>
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#include "apa102.pio.h"
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#include "pico/stdlib.h"
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#include "hardware/pio.h"
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#include "hardware/dma.h"
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#include "hardware/irq.h"
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#include "hardware/clocks.h"
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#include "hardware/timer.h"
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namespace plasma {
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class APA102 {
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public:
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static const uint DEFAULT_SERIAL_FREQ = 20 * 1000 * 1000; // 20MHz
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#pragma pack(push, 1)
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union alignas(4) RGB {
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struct {
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uint8_t sof = 0b11101111;
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uint8_t b;
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uint8_t g;
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uint8_t r;
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} ;
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uint32_t srgb;
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void operator=(uint32_t v) {
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srgb = v;
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};
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void brightness(uint8_t b) {
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sof = 0b11100000 | b;
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};
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void rgb(uint8_t r, uint8_t g, uint8_t b) {
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this->r = r;
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this->g = g;
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this->b = b;;
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}
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RGB() : sof(0b11101111), b(0), g(0), r(0) {};
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};
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#pragma pack(pop)
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RGB *buffer;
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uint32_t num_leds;
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APA102(uint num_leds, PIO pio, uint sm, uint pin_dat, uint pin_clk, uint freq=DEFAULT_SERIAL_FREQ, RGB* buffer=nullptr);
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~APA102() {
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stop();
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clear();
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update(true);
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dma_channel_unclaim(dma_channel);
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pio_sm_unclaim(pio, sm);
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delete[] buffer;
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}
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bool start(uint fps=60);
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bool stop();
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void update(bool blocking=false);
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void clear();
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void set_hsv(uint32_t index, float h, float s, float v);
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void set_rgb(uint32_t index, uint8_t r, uint8_t g, uint8_t b);
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void set_brightness(uint8_t b);
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RGB get(uint32_t index) {return buffer[index];};
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static bool dma_timer_callback(struct repeating_timer *t);
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private:
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uint32_t fps;
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PIO pio;
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uint sm;
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int dma_channel;
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struct repeating_timer timer;
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};
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} |