diff --git a/examples/rp/Cargo.toml b/examples/rp/Cargo.toml index f07684f29..1e8870ed7 100644 --- a/examples/rp/Cargo.toml +++ b/examples/rp/Cargo.toml @@ -28,6 +28,7 @@ embedded-graphics = "0.7.1" st7789 = "0.6.1" display-interface = "0.4.1" byte-slice-cast = { version = "1.2.0", default-features = false } +smart-leds = "0.3.0" embedded-hal-1 = { package = "embedded-hal", version = "=1.0.0-alpha.9" } embedded-hal-async = "0.2.0-alpha.0" diff --git a/examples/rp/src/bin/ws2812-pio.rs b/examples/rp/src/bin/ws2812-pio.rs new file mode 100644 index 000000000..5f8a3baee --- /dev/null +++ b/examples/rp/src/bin/ws2812-pio.rs @@ -0,0 +1,142 @@ +#![no_std] +#![no_main] +#![feature(type_alias_impl_trait)] + +use defmt::*; +use embassy_executor::Spawner; +use embassy_rp::gpio::{self, Pin}; +use embassy_rp::pio::{ + FifoJoin, PioInstance, PioPeripheral, PioStateMachine, PioStateMachineInstance, ShiftDirection, SmInstance, +}; +use embassy_rp::pio_instr_util; +use embassy_rp::relocate::RelocatedProgram; +use embassy_time::{Duration, Timer}; +use smart_leds::RGB8; +use {defmt_rtt as _, panic_probe as _}; +pub struct Ws2812 { + sm: PioStateMachineInstance, +} + +impl Ws2812 { + pub fn new(mut sm: PioStateMachineInstance, pin: gpio::AnyPin) -> Self { + // Setup sm0 + + // prepare the PIO program + let side_set = pio::SideSet::new(false, 1, false); + let mut a: pio::Assembler<32> = pio::Assembler::new_with_side_set(side_set); + + const T1: u8 = 2; // start bit + const T2: u8 = 5; // data bit + const T3: u8 = 3; // stop bit + const CYCLES_PER_BIT: u32 = (T1 + T2 + T3) as u32; + + let mut wrap_target = a.label(); + let mut wrap_source = a.label(); + let mut do_zero = a.label(); + a.set_with_side_set(pio::SetDestination::PINDIRS, 1, 0); + a.bind(&mut wrap_target); + // Do stop bit + a.out_with_delay_and_side_set(pio::OutDestination::X, 1, T3 - 1, 0); + // Do start bit + a.jmp_with_delay_and_side_set(pio::JmpCondition::XIsZero, &mut do_zero, T1 - 1, 1); + // Do data bit = 1 + a.jmp_with_delay_and_side_set(pio::JmpCondition::Always, &mut wrap_target, T2 - 1, 1); + a.bind(&mut do_zero); + // Do data bit = 0 + a.nop_with_delay_and_side_set(T2 - 1, 0); + a.bind(&mut wrap_source); + + let prg = a.assemble_with_wrap(wrap_source, wrap_target); + + let relocated = RelocatedProgram::new(&prg); + sm.write_instr(relocated.origin() as usize, relocated.code()); + pio_instr_util::exec_jmp(&mut sm, relocated.origin()); + + // Pin config + let out_pin = sm.make_pio_pin(pin); + sm.set_set_pins(&[&out_pin]); + sm.set_sideset_base_pin(&out_pin); + sm.set_sideset_count(1); + + // Clock config + // TODO CLOCK_FREQ should come from embassy_rp + const CLOCK_FREQ: u32 = 125_000_000; + const WS2812_FREQ: u32 = 800_000; + + let bit_freq = WS2812_FREQ * CYCLES_PER_BIT; + let mut int = CLOCK_FREQ / bit_freq; + let rem = CLOCK_FREQ - (int * bit_freq); + let frac = (rem * 256) / bit_freq; + // 65536.0 is represented as 0 in the pio's clock divider + if int == 65536 { + int = 0; + } + + sm.set_clkdiv((int << 8) | frac); + let pio::Wrap { source, target } = relocated.wrap(); + sm.set_wrap(source, target); + + // FIFO config + sm.set_autopull(true); + sm.set_fifo_join(FifoJoin::TxOnly); + sm.set_pull_threshold(24); + sm.set_out_shift_dir(ShiftDirection::Left); + + sm.set_enable(true); + + Self { sm } + } + + pub async fn write(&mut self, colors: &[RGB8]) { + for color in colors { + let word = (u32::from(color.g) << 24) | (u32::from(color.r) << 16) | (u32::from(color.b) << 8); + self.sm.wait_push(word).await; + } + } +} + +/// Input a value 0 to 255 to get a color value +/// The colours are a transition r - g - b - back to r. +fn wheel(mut wheel_pos: u8) -> RGB8 { + wheel_pos = 255 - wheel_pos; + if wheel_pos < 85 { + return (255 - wheel_pos * 3, 0, wheel_pos * 3).into(); + } + if wheel_pos < 170 { + wheel_pos -= 85; + return (0, wheel_pos * 3, 255 - wheel_pos * 3).into(); + } + wheel_pos -= 170; + (wheel_pos * 3, 255 - wheel_pos * 3, 0).into() +} + +#[embassy_executor::main] +async fn main(_spawner: Spawner) { + info!("Start"); + let p = embassy_rp::init(Default::default()); + + let (_pio0, sm0, _sm1, _sm2, _sm3) = p.PIO0.split(); + + // This is the number of leds in the string. Helpfully, the sparkfun thing plus and adafruit + // feather boards for the 2040 both have one built in. + const NUM_LEDS: usize = 1; + let mut data = [RGB8::default(); NUM_LEDS]; + + // For the thing plus, use pin 8 + // For the feather, use pin 16 + let mut ws2812 = Ws2812::new(sm0, p.PIN_8.degrade()); + + // Loop forever making RGB values and pushing them out to the WS2812. + loop { + for j in 0..(256 * 5) { + debug!("New Colors:"); + for i in 0..NUM_LEDS { + data[i] = wheel((((i * 256) as u16 / NUM_LEDS as u16 + j as u16) & 255) as u8); + debug!("R: {} G: {} B: {}", data[i].r, data[i].g, data[i].b); + } + ws2812.write(&data).await; + + Timer::after(Duration::from_micros(5)).await; + } + } +}