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refactor: lcd modern but still boom

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This commit is contained in:
cscherr 2025-05-13 17:41:38 +02:00
parent 418ae7d1b2
commit 69d2c65076
Signed by: cscherrNT
GPG key ID: 8E2B45BC51A27EA7
1 changed files with 5 additions and 12 deletions
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17
examples/lcd.rs
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@ -1,8 +1,7 @@
#![no_main]
#![no_std]
use defmt::{debug, error, info, println, trace, warn};
use hal::pwm::Pin;
use defmt::info;
use panic_probe as _;
use defmt_rtt as _; // global logger
@ -12,7 +11,6 @@ use core::fmt::Write;
use cortex_m_rt::entry;
use hal::{pac, prelude::*, rcc::Config};
use hd44780_driver::HD44780;
use heapless::Vec;
#[defmt::panic_handler]
fn panic() -> ! {
@ -30,10 +28,6 @@ fn main() -> ! {
let gpiob = dp.GPIOB.split(&mut rcc);
let gpioc = dp.GPIOC.split(&mut rcc);
// contrast over A0 analog port
// analog output seems to not be supported somehow?
let mut vO = gpioa.pa0.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();
@ -41,10 +35,10 @@ fn main() -> ! {
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();
// clock enable on D9
let en = gpioc.pc7.into_push_pull_output();
// register select on D8, the lib wants that but I'd just put it on ground otherwise
let rs = gpioa.pa9.into_push_pull_output();
// See https://en.wikipedia.org/wiki/Hitachi_HD44780_LCD_controller#Interface
// for the pins of the LCD
@ -69,7 +63,6 @@ fn main() -> ! {
let mut i = 0;
loop {
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)