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#include "main.h"
#include <inttypes.h>
extern TIM_HandleTypeDef htim5;
static uint8_t pwm_values[8 * 3 + 1];
static uint32_t idle_timer_start = 0;
static uint32_t last_led_update_time = 0;
static double idle_hue = 240;
static double idle_hue_speed = 0.05;
static double idle_value = 0.25;
typedef struct
{
double r; // a fraction between 0 and 1
double g; // a fraction between 0 and 1
double b; // a fraction between 0 and 1
} rgb;
typedef struct
{
double h; // angle in degrees
double s; // a fraction between 0 and 1
double v; // a fraction between 0 and 1
} hsv;
static rgb hsv2rgb(hsv in)
{
double 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;
while (hh > 360)
hh -= 360;
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;
}
static void update_led()
{
while (last_led_update_time + 2 > HAL_GetTick())
{
}
HAL_TIMEx_PWMN_Stop_DMA(&htim5, TIM_CHANNEL_3);
htim5.Instance->CCR3 = 1;
htim5.Instance->CNT = 0;
HAL_TIM_PWM_Start_DMA(&htim5, TIM_CHANNEL_3, (void*) pwm_values, sizeof(pwm_values));
last_led_update_time = HAL_GetTick();
}
void set_led_color(uint8_t r, uint8_t g, uint8_t b)
{
uint8_t i;
const uint8_t led = 0;
for (i = 0; i < 8; i++)
pwm_values[led * 8 * 3 + i] = ((r >> (7 - i)) & 1) ? 65 : 24;
for (i = 0; i < 8; i++)
pwm_values[led * 8 * 3 + 8 + i] = ((g >> (7 - i)) & 1) ? 65 : 24;
for (i = 0; i < 8; i++)
pwm_values[led * 8 * 3 + 16 + i] = ((b >> (7 - i)) & 1) ? 65 : 24;
pwm_values[sizeof(pwm_values) - 1] = 0;
update_led();
}
void led_off()
{
set_led_color(0x00, 0x00, 0x00);
idle_timer_start = HAL_GetTick();
idle_value = 0;
}
void led_white()
{
set_led_color(0x40, 0x40, 0x40);
}
void led_green()
{
set_led_color(0x00, 0x80, 0x00);
}
void led_red()
{
set_led_color(0x80, 0x00, 0x00);
}
void led_yellow()
{
set_led_color(0x80, 0x80, 0x00);
}
void led_blue()
{
set_led_color(0x00, 0x00, 0x40);
}
void led_magenta()
{
set_led_color(0x80, 0x00, 0x80);
}
void led_cyan()
{
set_led_color(0x00, 0x80, 0x80);
}
void led_idle()
{
if (idle_timer_start + 5000 < HAL_GetTick())
{
hsv h;
h.h = idle_hue;
h.s = 1;
h.v = idle_value;
rgb r = hsv2rgb(h);
set_led_color(r.r * 0xFF, r.g * 0xFF, r.b * 0xFF);
idle_hue += idle_hue_speed;
if (idle_hue > 270 || idle_hue < 190)
idle_hue_speed *= -1;
if (idle_value < 0.25)
idle_value += 0.0001;
}
}
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