a55c9d77ec
- Add RMT output channel support for ESP32, ESP32-S2, ESP32-S3, ESP32-C3 - Add add RMT adapter for `smart-leds` crate - Add example `hello_rgb` for ESP32-S2, ESP32-S3 and ESP32-C3 that either drives one LED at the pin where a LED is located on the official devkits - Add example `hello_rgb` for ESP32 that is driving a 12-element RGB ring.
89 lines
2.6 KiB
Rust
89 lines
2.6 KiB
Rust
//! RGB LED Demo
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//!
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//! This example drives an 12-element RGB ring that is connected to GPIO33
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//!
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//! The LEDs in the ring are transitioning though the HSV color spectrum for
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//! - Saturation: 255
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//! - Hue: 0 - 255
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//! - Value: 255
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//!
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//! For the 12-element RGB ring to work, building the release version is going
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//! to be required.
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#![no_std]
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#![no_main]
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use esp32_hal::{
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pac,
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prelude::*,
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utils::{smartLedAdapter, SmartLedsAdapter},
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Delay,
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PulseControl,
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RtcCntl,
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Timer,
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IO,
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};
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#[allow(unused_imports)]
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use panic_halt as _;
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use smart_leds::{
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brightness,
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gamma,
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hsv::{hsv2rgb, Hsv},
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SmartLedsWrite,
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};
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use xtensa_lx_rt::entry;
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#[entry]
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fn main() -> ! {
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let mut peripherals = pac::Peripherals::take().unwrap();
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let mut rtc_cntl = RtcCntl::new(peripherals.RTC_CNTL);
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let mut timer0 = Timer::new(peripherals.TIMG0);
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let io = IO::new(peripherals.GPIO, peripherals.IO_MUX);
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// Disable MWDT and RWDT (Watchdog) flash boot protection
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timer0.disable();
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rtc_cntl.set_wdt_global_enable(false);
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// Configure RMT peripheral globally
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let pulse = PulseControl::new(peripherals.RMT, &mut peripherals.DPORT).unwrap();
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// We use one of the RMT channels to instantiate a `SmartLedsAdapter` which can
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// be used directly with all `smart_led` implementations
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// -> We need to use the macro `smartLedAdapter!` with the number of addressed
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// LEDs here to initialize the internal LED pulse buffer to the correct
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// size!
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let mut led = <smartLedAdapter!(12)>::new(pulse.channel0, io.pins.gpio33);
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// Initialize the Delay peripheral, and use it to toggle the LED state in a
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// loop.
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let mut delay = Delay::new();
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let mut color = Hsv {
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hue: 0,
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sat: 255,
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val: 255,
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};
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let mut data;
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loop {
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// Iterate over the rainbow!
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for hue in 0..=255 {
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color.hue = hue;
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// Convert from the HSV color space (where we can easily transition from one
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// color to the other) to the RGB color space that we can then send to the LED
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let rgb_color = hsv2rgb(color);
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// Assign new color to all 12 LEDs
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data = [rgb_color; 12];
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// When sending to the LED, we do a gamma correction first (see smart_leds
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// documentation for details) and then limit the brightness to 10 out of 255 so
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// that the output it's not too bright.
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led.write(brightness(gamma(data.iter().cloned()), 10))
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.unwrap();
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delay.delay_ms(20u8);
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}
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}
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}
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