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Removed weird rom function usage, reformulated comments and cleaned up hsv2rgb() code.

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Weird Constructor 2022-01-09 22:02:31 +01:00
parent 2b49bc6b60
commit 5b07c09cfb
1 changed files with 12 additions and 14 deletions
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26
boards/rp-pico/examples/pico_ws2812_led.rs
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@ -9,7 +9,8 @@
//!
//! The example also comes with an utility function to calculate the colors
//! from HSV color space. It also limits the brightness a bit to save a
//! few amperes.
//! few milliamperes - be careful if you increase the strip length you will
//! quickly get into power consumption of multiple amperes.
//!
//! The example assumes you connected the data input to pin 6 of the
//! Raspberry Pi Pico, which is GPIO4 of the rp2040. Here is a circuit
@ -118,9 +119,7 @@ fn main() -> ! {
// Import the `sin` function for a smooth hue animation from the
// Pico rp2040 ROM:
let sin = unsafe {
core::mem::transmute::<_, fn(f32) -> f32>(rp_pico::hal::rom_data::float_funcs::fsin())
};
let sin = rp_pico::hal::rom_data::float_funcs::fsin();
// Create a count down timer for the Ws2812 instance:
let timer = Timer::new(pac.TIMER, &mut pac.RESETS);
@ -143,10 +142,10 @@ fn main() -> ! {
let mut leds: [RGB8; STRIP_LEN] = [(0, 0, 0).into(); STRIP_LEN];
let mut t = 0.0;
// Bring down the overall brightness of the strip to save
// a few amperes (every LED draws ~60mA, RGB means 3 LEDs per
// Bring down the overall brightness of the strip to not blow
// the USB power supply: every LED draws ~60mA, RGB means 3 LEDs per
// ws2812 LED, for 3 LEDs that would be: 3 * 3 * 60mA, which is
// already 540mA!
// already 540mA for just 3 white LEDs!
let strip_brightness = 64u8; // Limit brightness to 64/256
// Slow down timer by this factor (0.1 will result in 10 seconds):
@ -196,21 +195,20 @@ pub fn hsv2rgb(hue: f32, sat: f32, val: f32) -> (f32, f32, f32) {
let v = if v < 0.0 { -v } else { v };
let x = c * (1.0 - v);
let m = val - c;
let (r_, g_, b_) = if (0.0..60.0).contains(&hue) {
let (r, g, b) = if hue < 60.0 {
(c, x, 0.0)
} else if (60.0..120.0).contains(&hue) {
} else if hue < 120.0 {
(x, c, 0.0)
} else if (120.0..180.0).contains(&hue) {
} else if hue < 180.0 {
(0.0, c, x)
} else if (180.0..240.0).contains(&hue) {
} else if hue < 240.0 {
(0.0, x, c)
} else if (240.0..300.0).contains(&hue) {
} else if hue < 300.0 {
(x, 0.0, c)
} else {
// if hue >= 300.0 && hue < 360.0 {
(c, 0.0, x)
};
(r_ + m, g_ + m, b_ + m)
(r + m, g + m, b + m)
}
pub fn hsv2rgb_u8(h: f32, s: f32, v: f32) -> (u8, u8, u8) {