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typo fix

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This commit is contained in:
eZio Pan 2023-12-18 01:02:58 +08:00
parent 1934c2abc8
commit 05b8818de0
1 changed files with 5 additions and 4 deletions
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9
examples/stm32f4/src/bin/ws2812_spi.rs
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@ -5,7 +5,7 @@
// Thus we can adjust SPI to send each *round* of data at 800 kHz, and in each *round*, we can adjust each *bit* to mimic 2 different PWM waveform.
// such that the output waveform meet the bit representation of ws2812.
//
// If you want to save SPI for other purpose, you may want to take a look at `ws2812_tim_dma.rs` file, which make use of TIM and DMA.
// If you want to save SPI for other purpose, you may want to take a look at `ws2812_pwm_dma.rs` file, which make use of TIM and DMA.
//
// Warning:
// DO NOT stare at ws2812 directy (especially after each MCU Reset), its (max) brightness could easily make your eyes feel burn.
@ -20,11 +20,12 @@ use embassy_time::{Duration, Ticker, Timer};
use {defmt_rtt as _, panic_probe as _};
// we use 16 bit data frame format of SPI, to let timing as accurate as possible.
// thanks to loose tolerance of ws2812 timing, you can also use 8 bit data frame format, thus you need want to adjust the bit representation.
// thanks to loose tolerance of ws2812 timing, you can also use 8 bit data frame format, thus you will need to adjust the bit representation.
const N0: u16 = 0b1111100000000000u16; // ws2812 Bit 0 high level timing
const N1: u16 = 0b1111111111000000u16; // ws2812 Bit 1 high level timing
// ws2812 only need 24 bits for each LED, but we add one bit more to keep SPI output low
// ws2812 only need 24 bits for each LED,
// but we add one bit more to keep SPI output low at the end
static TURN_OFF: [u16; 25] = [
N0, N0, N0, N0, N0, N0, N0, N0, // Green
@ -77,7 +78,7 @@ async fn main(_spawner: embassy_executor::Spawner) {
let mut spi_config = spi::Config::default();
spi_config.frequency = khz(12_800);
// Since we only output waveform, then the Rx and Sck it is not considered
// Since we only output waveform, then the Rx and Sck and RxDma it is not considered
let mut ws2812_spi = spi::Spi::new_txonly_nosck(dp.SPI1, dp.PB5, dp.DMA2_CH3, dma::NoDma, spi_config);
// flip color at 2 Hz