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use std;
use std::time::Duration;
use std::io::Error;
use super::hosts::{HD44780Host, Mode};
pub enum DisplayRow {
R0,
R1
}
pub struct HD44780 {
host: Box<HD44780Host>
}
impl HD44780 {
pub fn new(h: Box<HD44780Host>) -> HD44780 {
return HD44780 {host: h};
}
pub fn init(&mut self) -> Result<(), Error> {
try!(self.host.init());
self.write_cmd(0x33);
self.write_cmd(0x32);
self.write_cmd(0x28);
self.write_cmd(0x0C);
self.write_cmd(0x06);
self.write_cmd(0x01);
Ok(())
}
fn delay(&self) {
std::thread::sleep(Duration::from_millis(3));
}
fn reset_data(&mut self) {
self.host.data4(false);
self.host.data5(false);
self.host.data6(false);
self.host.data7(false);
}
fn toggle_enable(&mut self) {
self.delay();
self.host.enable(false);
self.delay();
self.host.enable(true);
self.delay();
}
fn write_cmd(&mut self, b: u8) {
self.write_byte_in_mode(b, Mode::Command);
}
fn write_data(&mut self, b: u8) {
self.write_byte_in_mode(b, Mode::Data)
}
fn write_byte_in_mode(&mut self, b: u8, mode: Mode) {
self.host.rs(mode);
self.reset_data();
if b&0x10==0x10 {
self.host.data4(true);
}
if b&0x20==0x20 {
self.host.data5(true);
}
if b&0x40==0x40 {
self.host.data6(true);
}
if b&0x80==0x80 {
self.host.data7(true);
}
self.toggle_enable();
self.reset_data();
if b&0x01==0x01 {
self.host.data4(true);
}
if b&0x02==0x02 {
self.host.data5(true);
}
if b&0x04==0x04 {
self.host.data6(true);
}
if b&0x08==0x08 {
self.host.data7(true);
}
self.toggle_enable();
}
pub fn row_select(&mut self, row: DisplayRow) {
match row {
DisplayRow::R0 => self.write_cmd(0x80),
DisplayRow::R1 => self.write_cmd(0xC0)
}
}
pub fn write_string(&mut self, txt: &str) {
let bytes = txt.as_bytes();
let len = if txt.len() > 16 {
16
} else {
txt.len()
};
for i in 0..len {
self.write_data(bytes[i]);
}
for _i in (len-1)..17 {
self.write_data(0x20);
}
}
}