From 60e073a706fd95580c63afd0c823d01bcfefed75 Mon Sep 17 00:00:00 2001 From: Ross Andrews Date: Mon, 7 Sep 2026 18:35:36 -0500 Subject: [PATCH] led and backlight --- .cargo/config.toml | 6 + .gitignore | 1 + Cargo.lock | 1463 ++++++++++++++++++++++++++++++++++++++++++++ Cargo.toml | 20 + src/backlight.rs | 50 ++ src/led.rs | 42 ++ src/main.rs | 69 +++ 7 files changed, 1651 insertions(+) create mode 100644 .cargo/config.toml create mode 100644 .gitignore create mode 100644 Cargo.lock create mode 100644 Cargo.toml create mode 100644 src/backlight.rs create mode 100644 src/led.rs create mode 100644 src/main.rs diff --git a/.cargo/config.toml b/.cargo/config.toml new file mode 100644 index 0000000..ce81ace --- /dev/null +++ b/.cargo/config.toml @@ -0,0 +1,6 @@ +[build] +target = "riscv32imac-unknown-none-elf" + +[target.riscv32imac-unknown-none-elf] +runner = "espflash flash --monitor" +rustflags = ["-C", "link-arg=-Tlinkall.x"] \ No newline at end of file diff --git a/.gitignore 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/dev/null +++ b/Cargo.toml @@ -0,0 +1,20 @@ +[package] +name = "espboard" +version = "0.1.0" +edition = "2024" + +[dependencies] +esp-backtrace = { version = "0.20.0", features = ["esp32c6", "println", "panic-handler"] } +esp-bootloader-esp-idf = { version = "0.6.0", features = ["esp32c6"] } +esp-hal = { version = "1.2.0", features = ["esp32c6", "unstable"] } +esp-hal-smartled = { version = "0.18", default-features = false, features = ["esp32c6"] } +esp-println = { version = "0.18.0", default-features = false, features = ["esp32c6", "jtag-serial"] } +smart-leds = "0.4" +smart-leds-trait = "0.3" + +[profile.dev] +codegen-units = 1 +incremental = false + +[profile.release] +codegen-units = 1 \ No newline at end of file diff --git a/src/backlight.rs b/src/backlight.rs new file mode 100644 index 0000000..fc7affc --- /dev/null +++ b/src/backlight.rs @@ -0,0 +1,50 @@ +use esp_hal::gpio::interconnect::PeripheralOutput; +use esp_hal::gpio::DriveMode; +use esp_hal::ledc::channel::{self, Channel, ChannelIFace}; +use esp_hal::ledc::timer::TimerIFace; +use esp_hal::ledc::LowSpeed; + +/// Maximum duty cycle percentage. The board documentation warns against +/// running the display above 50% brightness, so `level = 1.0` maps to this. +const MAX_DUTY_PCT: u8 = 50; + +#[derive(Debug)] +pub enum Error { + Channel(channel::Error), +} + +impl From for Error { + fn from(e: channel::Error) -> Self { + Error::Channel(e) + } +} + +/// Backlight PWM driver. The channel holds a reference to the caller-owned +/// timer, so this type's lifetime is bounded by the timer's lifetime. +pub struct LcdBacklight<'a> { + channel: Channel<'a, LowSpeed>, +} + +impl<'a> LcdBacklight<'a> { + pub fn new( + timer: &'a dyn TimerIFace, + pin: impl PeripheralOutput<'a>, + ) -> Result { + let mut channel = Channel::new(channel::Number::Channel0, pin); + channel.configure(channel::config::Config { + timer, + duty_pct: 0, + drive_mode: DriveMode::PushPull, + })?; + Ok(Self { channel }) + } + + /// Set the backlight level from `0.0` (off) to `1.0` (maximum). + /// + /// `1.0` is scaled to a 50% duty cycle, the maximum brightness the board + /// documentation recommends. + pub fn set_level(&mut self, level: f32) -> Result<(), Error> { + let duty_pct = ((level.clamp(0.0, 1.0) * MAX_DUTY_PCT as f32) + 0.5) as u8; + self.channel.set_duty(duty_pct).map_err(Error::Channel) + } +} \ No newline at end of file diff --git a/src/led.rs b/src/led.rs new file mode 100644 index 0000000..5496649 --- /dev/null +++ b/src/led.rs @@ -0,0 +1,42 @@ +use esp_hal::gpio::interconnect::PeripheralOutput; +use esp_hal::rmt::TxChannelCreator; +use esp_hal::time::Rate; +use esp_hal::Blocking; +use esp_hal_smartled::{RmtSmartLeds, WS2812_TIMING, buffer_size, color_order}; +use smart_leds_trait::{RGB8, SmartLedsWrite}; + +const RMT_FREQ: Rate = Rate::from_mhz(80); + +type SmartLed = RmtSmartLeds<'static, { buffer_size::(1) }, Blocking, RGB8, color_order::Grb>; + +pub struct RgbLed { + led: SmartLed, +} + +impl RgbLed { + pub fn new( + channel: impl TxChannelCreator<'static, Blocking>, + pin: impl PeripheralOutput<'static>, + ) -> Result { + Ok(Self { + led: SmartLed::new_with_memsize(WS2812_TIMING, channel, pin, 2, RMT_FREQ)?, + }) + } + + pub fn set_color( + &mut self, + r: u8, + g: u8, + b: u8, + ) -> Result<(), esp_hal_smartled::AdapterError> { + self.led.write([RGB8 { r, g, b }]) + } + + pub fn set_rgb(&mut self, rgb: RGB8) -> Result<(), esp_hal_smartled::AdapterError> { + self.led.write([rgb]) + } + + pub fn off(&mut self) -> Result<(), esp_hal_smartled::AdapterError> { + self.set_color(0, 0, 0) + } +} \ No newline at end of file diff --git a/src/main.rs b/src/main.rs new file mode 100644 index 0000000..a5efd62 --- /dev/null +++ b/src/main.rs @@ -0,0 +1,69 @@ +#![no_std] +#![no_main] + +mod backlight; +mod led; + +use esp_backtrace as _; +use esp_bootloader_esp_idf::esp_app_desc; +use esp_hal::ledc::timer::{self, TimerIFace}; +use esp_hal::ledc::{LSGlobalClkSource, Ledc, LowSpeed}; +use esp_hal::{init, rmt::Rmt, time::Rate, Config}; +use esp_println::println; +use smart_leds::hsv::{hsv2rgb, Hsv}; +use smart_leds::{brightness, gamma}; + +esp_app_desc!(); + +#[esp_hal::main] +fn main() -> ! { + let peripherals = init(Config::default()); + + let mut led = { + let rmt = Rmt::new(peripherals.RMT, Rate::from_mhz(80)).expect("Failed to init RMT"); + led::RgbLed::new(rmt.channel0, peripherals.GPIO8).expect("Failed to init RGB LED") + }; + + let mut ledc = Ledc::new(peripherals.LEDC); + ledc.set_global_slow_clock(LSGlobalClkSource::APBClk); + let mut timer = ledc.timer::(timer::Number::Timer0); + timer + .configure(timer::config::Config { + duty: timer::config::Duty::Duty8Bit, + clock_source: timer::LSClockSource::APBClk, + frequency: Rate::from_khz(5), + }) + .expect("Failed to configure backlight timer"); + let mut backlight = + backlight::LcdBacklight::new(&timer, peripherals.GPIO22).expect("Failed to init backlight"); + + let delay = esp_hal::delay::Delay::new(); + + let levels = [1.0f32, 0.75, 0.5, 0.25, 0.0, 0.5]; + let mut level_idx = 0; + + loop { + for hue in 0..=255 { + let rgb = hsv2rgb(Hsv { + hue, + sat: 255, + val: 255, + }); + let lit = brightness(gamma(core::iter::once(rgb)), 40) + .next() + .unwrap(); + led.set_rgb(lit).unwrap(); + + if hue % 32 == 0 { + println!("hue {hue}: ({}, {}, {})", lit.r, lit.g, lit.b); + } + + delay.delay_millis(10); + } + + let level = levels[level_idx % levels.len()]; + backlight.set_level(level).unwrap(); + println!("backlight level: {level}"); + level_idx += 1; + } +} \ No newline at end of file