Merge #441

441: hd44780-driver example r=therealprof a=burrbull



Co-authored-by: Andrey Zgarbul <[email protected]>

Author: bors[bot]

CHANGELOG.md

@@ -29,6 +29,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 - Missing `DelayMs<u8>` / `DelayUs<u8>` impls for fugit::Delay
 - Support of embedded-hal 1.0.0-alpha.7 [#443]
+- `hd44780` example [#441]
 - Aliases for peripheral wrappers [#434]
 - `WithPwm` trait implemented for timers with channels (internals) [#425]
 - `Pwm` struct with `split` method and implementation of embedded-hal::Pwm (similar to f1xx-hal) [#425]
@@ -52,6 +53,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 [#439]: https://github.com/stm32-rs/stm32f4xx-hal/pull/439
 [#440]: https://github.com/stm32-rs/stm32f4xx-hal/pull/440
 [#443]: https://github.com/stm32-rs/stm32f4xx-hal/pull/443
+[#441]: https://github.com/stm32-rs/stm32f4xx-hal/pull/441
 
 ### Changed
 

Cargo.toml

@@ -46,6 +46,7 @@ fugit-timer = "0.1.3"
 rtic-monotonic = { version = "1.0", optional = true }
 bitflags = "1.3.2"
 embedded-storage = "0.2"
+hd44780-driver = "0.4.0"
 
 [dependencies.time]
 version = "0.3"
@@ -473,3 +474,7 @@ required-features = ["device-selected"]
 name = "rtc"
 required-features = ["device-selected"]
 
+[[example]]
+name = "hd44780"
+required-features = ["device-selected"]
+

examples/blinky-timer-irq.rs

@@ -18,7 +18,7 @@ use crate::hal::{
 };
 
 use core::cell::RefCell;
-use cortex_m::{asm::wfi, interrupt::Mutex};
+use cortex_m::interrupt::Mutex;
 use cortex_m_rt::entry;
 
 // NOTE You can uncomment 'hprintln' here and in the code below for a bit more
@@ -93,6 +93,7 @@ fn main() -> ! {
     }
 
     loop {
-        wfi();
+        // Uncomment if you want to make controller sleep
+        // cortex_m::asm::wfi();
     }
 }

examples/hd44780.rs

@@ -0,0 +1,53 @@
+#![no_std]
+#![no_main]
+
+extern crate panic_halt;
+
+use cortex_m_rt::entry;
+use hd44780_driver::{Cursor, CursorBlink, Display, DisplayMode, HD44780};
+use stm32f4xx_hal::{pac, prelude::*};
+
+// Connections:
+// VSS: GND
+// VDD: 5V
+// V0:  10k poti between 5V and GND
+// RS:  PB7
+// RW:  GND
+// E:   PB8
+// D4-D7: PB6-PB3
+// A:   5V
+// K:   GND
+
+#[entry]
+fn main() -> ! {
+    let dp = pac::Peripherals::take().unwrap();
+
+    let rcc = dp.RCC.constrain();
+    let gpiob = dp.GPIOB.split();
+
+    let clocks = rcc.cfgr.freeze();
+    let mut delay = dp.TIM1.delay_us(&clocks);
+
+    let rs = gpiob.pb7.into_push_pull_output();
+    let en = gpiob.pb8.into_push_pull_output();
+    let d4 = gpiob.pb6.into_push_pull_output();
+    let d5 = gpiob.pb5.into_push_pull_output();
+    let d6 = gpiob.pb4.into_push_pull_output();
+    let d7 = gpiob.pb3.into_push_pull_output();
+
+    let mut lcd = HD44780::new_4bit(rs, en, d4, d5, d6, d7, &mut delay).unwrap();
+    lcd.reset(&mut delay).unwrap();
+    lcd.clear(&mut delay).unwrap();
+    lcd.set_display_mode(
+        DisplayMode {
+            display: Display::On,
+            cursor_visibility: Cursor::Visible,
+            cursor_blink: CursorBlink::On,
+        },
+        &mut delay,
+    )
+    .unwrap();
+    lcd.write_str("Hello, world!", &mut delay).unwrap();
+
+    loop {}
+}