HD44780 LCD example

Cargo.toml

@@ -52,6 +52,7 @@ mfrc522 = "0.2.0"
 serde_derive = "1.0.90"
 usb-device = "0.2.3"
 usbd-serial = "0.1.0"
+hd44780-driver = "0.4.0"
 
 [dev-dependencies.byteorder]
 default-features = false
@@ -150,3 +151,7 @@ required-features = ["has-can", "rt"]
 [[example]]
 name = "gpio_input"
 required-features = ["stm32f103"]
+
+[[example]]
+name = "lcd"
+required-features = ["stm32f103"]

examples/lcd.rs

@@ -0,0 +1,62 @@
+//! HD44780 LCD 4-line mode test
+
+#![deny(unsafe_code)]
+#![no_std]
+#![no_main]
+
+extern crate panic_halt;
+
+use cortex_m_rt::entry;
+use hd44780_driver::{Cursor, CursorBlink, Display, DisplayMode, HD44780};
+use stm32f1xx_hal::{afio::AfioExt, delay::Delay, flash::FlashExt, gpio::GpioExt, rcc::RccExt};
+
+// Connections:
+// VSS: GND
+// VDD: 5V
+// V0:  10k poti between 5V and GND
+// RS:  PD1
+// RW:  GND
+// E:   PD2
+// D4-D7: PD4-PD7
+// A:   5V
+// K:   GND
+
+#[entry]
+fn main() -> ! {
+    let cp = cortex_m::Peripherals::take().unwrap();
+    let dp = stm32f1xx_hal::pac::Peripherals::take().unwrap();
+
+    let mut flash = dp.FLASH.constrain();
+    let mut rcc = dp.RCC.constrain();
+    let gpioa = dp.GPIOA.split(&mut rcc.apb2);
+    let mut gpiob = dp.GPIOB.split(&mut rcc.apb2);
+    let mut afio = dp.AFIO.constrain(&mut rcc.apb2);
+
+    let (_pa15, pb3, pb4) = afio.mapr.disable_jtag(gpioa.pa15, gpiob.pb3, gpiob.pb4);
+
+    let clocks = rcc.cfgr.freeze(&mut flash.acr);
+    let mut delay = Delay::new(cp.SYST, clocks);
+
+    let d7 = pb3.into_push_pull_output(&mut gpiob.crl);
+    let d6 = pb4.into_push_pull_output(&mut gpiob.crl);
+    let d5 = gpiob.pb5.into_push_pull_output(&mut gpiob.crl);
+    let d4 = gpiob.pb6.into_push_pull_output(&mut gpiob.crl);
+    let rs = gpiob.pb7.into_push_pull_output(&mut gpiob.crl);
+    let en = gpiob.pb8.into_push_pull_output(&mut gpiob.crh);
+
+    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 {}
+}