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feat: boxes on my lcd

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This commit is contained in:
cscherr 2025-05-12 16:05:32 +02:00
parent b69e9e3fd4
commit 418ae7d1b2
Signed by: cscherrNT
GPG key ID: 8E2B45BC51A27EA7
1 changed files with 47 additions and 19 deletions
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66
examples/lcd.rs
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@ -1,7 +1,11 @@
#![no_main]
#![no_std]
extern crate panic_halt;
use defmt::{debug, error, info, println, trace, warn};
use hal::pwm::Pin;
use panic_probe as _;
use defmt_rtt as _; // global logger
use core::fmt::Write;
@ -10,6 +14,11 @@ use hal::{pac, prelude::*, rcc::Config};
use hd44780_driver::HD44780;
use heapless::Vec;
#[defmt::panic_handler]
fn panic() -> ! {
cortex_m::asm::udf()
}
#[entry]
fn main() -> ! {
let dp = pac::Peripherals::take().unwrap();
@ -18,37 +27,56 @@ fn main() -> ! {
let mut rcc = dp.RCC.freeze(Config::hsi16());
let gpioa = dp.GPIOA.split(&mut rcc);
let _gpiob = dp.GPIOB.split(&mut rcc);
let gpiob = dp.GPIOB.split(&mut rcc);
let gpioc = dp.GPIOC.split(&mut rcc);
let d0 = gpioc.pc0.into_push_pull_output();
let d1 = gpioc.pc1.into_push_pull_output();
let d2 = gpioc.pc2.into_push_pull_output();
let d3 = gpioc.pc3.into_push_pull_output();
let d4 = gpioc.pc4.into_push_pull_output();
let d5 = gpioc.pc5.into_push_pull_output();
let d6 = gpioc.pc6.into_push_pull_output();
let d7 = gpioc.pc7.into_push_pull_output();
// contrast over A0 analog port
// analog output seems to not be supported somehow?
let mut vO = gpioa.pa0.into_push_pull_output();
let rs = gpioc.pc8.into_push_pull_output();
let en = gpioc.pc9.into_push_pull_output();
// literal D4-D7 ports etc as written on the nucleo board, mapped to the D4-D7 ports of the LCD
// controller
let d4 = gpiob.pb5.into_push_pull_output();
let d5 = gpiob.pb4.into_push_pull_output();
let d6 = gpiob.pb10.into_push_pull_output();
let d7 = gpioa.pa8.into_push_pull_output();
// clock enable on D8
let en = gpioa.pa9.into_push_pull_output();
// register select on D9, the lib wants that but I'd just put it on ground otherwise
let rs = gpioc.pc7.into_push_pull_output();
// See https://en.wikipedia.org/wiki/Hitachi_HD44780_LCD_controller#Interface
// for the pins of the LCD
let mut delay = cp.SYST.delay(rcc.clocks);
let mut led = gpioa.pa5.into_push_pull_output();
let mut lcd = HD44780::new_8bit(rs, en, d0, d1, d2, d3, d4, d5, d6, d7, &mut delay).unwrap();
let mut lcd = HD44780::new_4bit(rs, en, d4, d5, d6, d7, &mut delay)
.expect("could not init HD44780 driver");
lcd.set_display_mode(
hd44780_driver::DisplayMode {
cursor_visibility: hd44780_driver::Cursor::Visible,
cursor_blink: hd44780_driver::CursorBlink::On,
display: hd44780_driver::Display::On,
},
&mut delay,
)
.expect("could not set display properties");
lcd.reset(&mut delay).expect("could not reset the lcd");
lcd.write_str("Hello world!", &mut delay)
.expect("could not write to LCD");
let mut i = 0;
let mut buf: Vec<u8, 40> = Vec::new();
loop {
lcd.write_str("Hello world!", &mut delay).unwrap();
vO.set_low().expect("set contrast low boom?");
led.set_high().unwrap();
info!("Writing to LCD...");
lcd.write_str("Hello world!\nGoing on", &mut delay)
.expect("could not write to LCD");
delay.delay_ms(500_u16);
info!("Done!");
led.set_low().unwrap();
write!(buf, "hello: {i}").unwrap();
lcd.write_bytes(&buf, &mut delay).unwrap();
delay.delay_ms(500_u16);