leds.c 4.28 KB
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#include "gpio.h"
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#include "portexpander.h"
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#include <stdint.h>
#include <string.h>

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#define NUM_LEDS 15

static const gpio_cfg_t rgb_dat_pin = {
	PORT_1, PIN_14, GPIO_FUNC_OUT, GPIO_PAD_NONE
};
static const gpio_cfg_t rgb_clk_pin = {
	PORT_1, PIN_15, GPIO_FUNC_OUT, GPIO_PAD_NONE
};
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static uint8_t leds[NUM_LEDS][4];
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/***** Functions *****/
// *****************************************************************************

typedef struct {
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	float r; // a fraction between 0 and 1
	float g; // a fraction between 0 and 1
	float b; // a fraction between 0 and 1
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} rgb;

typedef struct {
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	float h; // angle in degrees
	float s; // a fraction between 0 and 1
	float v; // a fraction between 0 and 1
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} hsv;

#if 0
static hsv rgb2hsv(rgb in)
{
    hsv         out;
    float      min, max, delta;

    min = in.r < in.g ? in.r : in.g;
    min = min  < in.b ? min  : in.b;

    max = in.r > in.g ? in.r : in.g;
    max = max  > in.b ? max  : in.b;

    out.v = max;                                // v
    delta = max - min;
    if (delta < 0.00001)
    {
        out.s = 0;
        out.h = 0; // undefined, maybe nan?
        return out;
    }
    if( max > 0.0 ) { // NOTE: if Max is == 0, this divide would cause a crash
        out.s = (delta / max);                  // s
    } else {
        // if max is 0, then r = g = b = 0
        // s = 0, h is undefined
        out.s = 0.0;
        out.h = 0.0;                            // its now undefined
        return out;
    }
    if( in.r >= max )                           // > is bogus, just keeps compilor happy
        out.h = ( in.g - in.b ) / delta;        // between yellow & magenta
    else
    if( in.g >= max )
        out.h = 2.0 + ( in.b - in.r ) / delta;  // between cyan & yellow
    else
        out.h = 4.0 + ( in.r - in.g ) / delta;  // between magenta & cyan

    out.h *= 60.0;                              // degrees

    if( out.h < 0.0 )
        out.h += 360.0;

    return out;
}
#endif

static rgb hsv2rgb(hsv in)
{
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	float hh, p, q, t, ff;
	long i;
	rgb out;

	if (in.s <= 0.0) { // < is bogus, just shuts up warnings
		out.r = in.v;
		out.g = in.v;
		out.b = in.v;
		return out;
	}
	hh = in.h;
	if (hh >= 360.0)
		hh = 0.0;
	hh /= 60.0;
	i  = (long)hh;
	ff = hh - i;
	p  = in.v * (1.0 - in.s);
	q  = in.v * (1.0 - (in.s * ff));
	t  = in.v * (1.0 - (in.s * (1.0 - ff)));

	switch (i) {
	case 0:
		out.r = in.v;
		out.g = t;
		out.b = p;
		break;
	case 1:
		out.r = q;
		out.g = in.v;
		out.b = p;
		break;
	case 2:
		out.r = p;
		out.g = in.v;
		out.b = t;
		break;

	case 3:
		out.r = p;
		out.g = q;
		out.b = in.v;
		break;
	case 4:
		out.r = t;
		out.g = p;
		out.b = in.v;
		break;
	case 5:
	default:
		out.r = in.v;
		out.g = p;
		out.b = q;
		break;
	}
	return out;
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}

static void shift(uint8_t data)
{
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	for (int i = 0; i < 8; i++) {
		if (data & 0x80) {
			GPIO_OutSet(&rgb_dat_pin);
		} else {
			GPIO_OutClr(&rgb_dat_pin);
		}
		GPIO_OutClr(&rgb_clk_pin);
		//TMR_Delay(MXC_TMR0, MSEC(1), 0);
		GPIO_OutSet(&rgb_clk_pin);
		//TMR_Delay(MXC_TMR0, MSEC(1), 0);
		data <<= 1;
	}
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}

static void leds_start(void)
{
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	shift(0x00);
	shift(0x00);
	shift(0x00);
	shift(0x00);
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}

static void leds_shift(uint8_t r, uint8_t g, uint8_t b, uint8_t dim)
{
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	shift(0xE0 | (dim & 0x1F));
	shift(b);
	shift(g);
	shift(r);
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}

static void leds_stop(void)
{
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	shift(0xFF);
	shift(0xFF);
	shift(0xFF);
	shift(0xFF);
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}

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void leds_set_dim(uint8_t led, uint8_t dim)
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{
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	leds[led][3] = dim;
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}

void leds_set(uint8_t led, uint8_t r, uint8_t g, uint8_t b)
{
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	leds[led][0] = r;
	leds[led][1] = g;
	leds[led][2] = b;
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}

void leds_set_hsv(uint8_t led, float h, float s, float v)
{
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	hsv in       = { h, s, v };
	rgb out      = hsv2rgb(in);
	leds[led][0] = out.r * 255;
	leds[led][1] = out.g * 255;
	leds[led][2] = out.b * 255;
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}

void leds_update(void)
{
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	leds_start();
	for (int i = NUM_LEDS - 1; i >= 0; i--) {
		leds_shift(leds[i][0], leds[i][1], leds[i][2], leds[i][3]);
	}
	leds_stop();
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}

void leds_init(void)
{
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	GPIO_Config(&rgb_clk_pin);
	GPIO_Config(&rgb_dat_pin);
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	GPIO_OutSet(&rgb_clk_pin);
	GPIO_OutClr(&rgb_dat_pin);
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	memset(leds, 0, sizeof(leds));
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	for (int i = 0; i < NUM_LEDS; i++) {
		leds[i][3] = 8;
	}
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	if (portexpander_detected()) {
		// Turn on LEDs
		// TODO: only turn on LEDs if value != 0,0,0 && dim > 0
		portexpander_set(0, 0);
		portexpander_set(1, 0);
		portexpander_set(2, 0);
	}
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	leds_update();
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}