feat: lcd works in my head

Cargo.lock

@@ -38,6 +38,12 @@ version = "0.13.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "46afbd2983a5d5a7bd740ccb198caf5b82f45c40c09c0eed36052d91cb92e719"
 
+[[package]]
+name = "byteorder"
+version = "1.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1fd0f2584146f6f2ef48085050886acf353beff7305ebd1ae69500e27c67f64b"
+
 [[package]]
 name = "cast"
 version = "0.3.0"
@@ -104,6 +110,34 @@ dependencies = [
  "num",
 ]
 
+[[package]]
+name = "hash32"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "47d60b12902ba28e2730cd37e95b8c9223af2808df9e902d4df49588d1470606"
+dependencies = [
+ "byteorder",
+]
+
+[[package]]
+name = "hd44780-driver"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "aab2b13fdeaed7dde9133a57c28b2cbde4a8fc8c3196b5631428aad114857d3a"
+dependencies = [
+ "embedded-hal",
+]
+
+[[package]]
+name = "heapless"
+version = "0.8.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0bfb9eb618601c89945a70e254898da93b13be0388091d42117462b265bb3fad"
+dependencies = [
+ "hash32",
+ "stable_deref_trait",
+]
+
 [[package]]
 name = "nb"
 version = "0.1.3"
@@ -125,6 +159,8 @@ version = "0.1.0"
 dependencies = [
  "cortex-m",
  "cortex-m-rt",
+ "hd44780-driver",
+ "heapless",
  "panic-halt",
  "stm32l0xx-hal",
 ]

Cargo.toml

@@ -12,3 +12,5 @@ hal = { package = "stm32l0xx-hal", version = "0.10.0", features = [
 cortex-m-rt = "0.7.5"
 panic-halt = "1.0.0"
 cortex-m = "0.7.7"
+hd44780-driver = "0.4.0"
+heapless = "0.8.0"

examples/lcd.rs

@@ -0,0 +1,57 @@
+#![no_main]
+#![no_std]
+
+extern crate panic_halt;
+
+use core::fmt::Write;
+
+use cortex_m_rt::entry;
+use hal::{pac, prelude::*, rcc::Config};
+use hd44780_driver::HD44780;
+use heapless::Vec;
+
+#[entry]
+fn main() -> ! {
+    let dp = pac::Peripherals::take().unwrap();
+    let cp = cortex_m::Peripherals::take().unwrap();
+
+    let mut rcc = dp.RCC.freeze(Config::hsi16());
+
+    let gpioa = dp.GPIOA.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();
+
+    let rs = gpioc.pc8.into_push_pull_output();
+    let en = gpioc.pc9.into_push_pull_output();
+
+    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 i = 0;
+    let mut buf: Vec<u8, 40> = Vec::new();
+    loop {
+        lcd.write_str("Hello world!", &mut delay).unwrap();
+        led.set_high().unwrap();
+
+        delay.delay_ms(500_u16);
+
+        led.set_low().unwrap();
+        write!(buf, "hello: {i}").unwrap();
+        lcd.write_bytes(&buf, &mut delay).unwrap();
+
+        delay.delay_ms(500_u16);
+
+        i += 1;
+    }
+}