1 unstable release
0.1.1 | Dec 17, 2023 |
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0.1.0 |
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#994 in Embedded development
21KB
540 lines
embedded-hal async driver for dot matrix lcd display
lcd is reset and initialized with display: off, it's off just because it's like that in reset procedure,
even if it seems to work with display: on
currently only works in write-only mode
use dummy pin for RW pin
doesn't track the current position
this is because this driver is designed to have very small memory footprint
the type Lcd can be zero sized depending on pin type and delay type
you should use seek to change line and position
currently blocking io and full width bus isn't supported
(it shouldn't be "hard") i'm just lazy
rw pin will allow use of busy flag but it isn't implemented
instead, this driver works by waiting for a while
waiting time is longer than the one in the spec, this is because i found problem with my compatible chip(eg. ks0066)
without rw pin support
example
pub struct EmbassyDelayNs;
impl DelayNs for EmbassyDelayNs {
async fn delay_ns(&mut self, ns: u32) {
embassy_time::Timer::after_micros(ns.div_ceil(1000) as u64).await;
}
}
let mut lcd = Lcd::<_, _, _, _, Infallible>::new(
LcdPinConfiguration {
en: pins.d7.into_output(),
rs: pins.d6.into_output(),
bus: HalfWidthBus {
d4: pins.d8.into_output(),
d5: pins.d9.into_output(),
d6: pins.d10.into_output(),
d7: pins.d11.into_output()
}
},
EmbassyDelayNs,
Lines::TwoLines,
EntryMode::default()
).await.unwrap();
lcd.set_display_control(DisplayControl::default()).await.unwrap();
lcd.seek(SeekFrom::Start(0)).await.unwrap(); //first line address 0..16
lcd.write_all("first line".as_bytes()).await.unwrap();
lcd.seek(SeekFrom::Start(40)).await.unwrap(); //second line address 40..56
lcd.write_all("second line".as_bytes()).await.unwrap();
Dependencies
~140KB