85 lines
2.5 KiB
Rust
Executable file
85 lines
2.5 KiB
Rust
Executable file
#![no_main]
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#![no_std]
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use defmt::{debug, error, info, println, trace, warn};
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use hal::pwm::Pin;
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use panic_probe as _;
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use defmt_rtt as _; // global logger
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use core::fmt::Write;
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use cortex_m_rt::entry;
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use hal::{pac, prelude::*, rcc::Config};
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use hd44780_driver::HD44780;
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use heapless::Vec;
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#[defmt::panic_handler]
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fn panic() -> ! {
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cortex_m::asm::udf()
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}
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#[entry]
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fn main() -> ! {
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let dp = pac::Peripherals::take().unwrap();
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let cp = cortex_m::Peripherals::take().unwrap();
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let mut rcc = dp.RCC.freeze(Config::hsi16());
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let gpioa = dp.GPIOA.split(&mut rcc);
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let gpiob = dp.GPIOB.split(&mut rcc);
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let gpioc = dp.GPIOC.split(&mut rcc);
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// contrast over A0 analog port
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// analog output seems to not be supported somehow?
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let mut vO = gpioa.pa0.into_push_pull_output();
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// literal D4-D7 ports etc as written on the nucleo board, mapped to the D4-D7 ports of the LCD
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// controller
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let d4 = gpiob.pb5.into_push_pull_output();
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let d5 = gpiob.pb4.into_push_pull_output();
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let d6 = gpiob.pb10.into_push_pull_output();
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let d7 = gpioa.pa8.into_push_pull_output();
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// clock enable on D8
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let en = gpioa.pa9.into_push_pull_output();
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// register select on D9, the lib wants that but I'd just put it on ground otherwise
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let rs = gpioc.pc7.into_push_pull_output();
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// See https://en.wikipedia.org/wiki/Hitachi_HD44780_LCD_controller#Interface
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// for the pins of the LCD
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let mut delay = cp.SYST.delay(rcc.clocks);
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let mut led = gpioa.pa5.into_push_pull_output();
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let mut lcd = HD44780::new_4bit(rs, en, d4, d5, d6, d7, &mut delay)
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.expect("could not init HD44780 driver");
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lcd.set_display_mode(
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hd44780_driver::DisplayMode {
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cursor_visibility: hd44780_driver::Cursor::Visible,
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cursor_blink: hd44780_driver::CursorBlink::On,
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display: hd44780_driver::Display::On,
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},
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&mut delay,
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)
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.expect("could not set display properties");
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lcd.reset(&mut delay).expect("could not reset the lcd");
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lcd.write_str("Hello world!", &mut delay)
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.expect("could not write to LCD");
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let mut i = 0;
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loop {
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vO.set_low().expect("set contrast low boom?");
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led.set_high().unwrap();
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info!("Writing to LCD...");
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lcd.write_str("Hello world!\nGoing on", &mut delay)
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.expect("could not write to LCD");
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info!("Done!");
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led.set_low().unwrap();
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delay.delay_ms(500_u16);
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i += 1;
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}
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}
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