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Started writing frame drawing

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Zac Wilson 2025-12-15 11:59:07 +00:00
parent 488b41d0f0
commit f30e0b7dc4
1 changed files with 69 additions and 21 deletions
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90
src/lib.rs
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@ -2,12 +2,13 @@
use embedded_hal::{ use embedded_hal::{
delay::DelayNs, delay::DelayNs,
digital::{InputPin, OutputPin}, spi::{Operation, SpiDevice}, digital::{InputPin, OutputPin},
spi::{Operation, SpiDevice},
}; };
const EPD_WIDTH: u32 = 240; const EPD_WIDTH: usize = 240;
const EPD_HEIGHT: u32 = 320; const EPD_HEIGHT: usize = 320;
const EPD_ARRAY: u32 = EPD_WIDTH * EPD_HEIGHT / 8; const EPD_ARRAY: usize = EPD_WIDTH * EPD_HEIGHT / 8;
pub struct EPaperDisplay<BusyPin, ResetPin, DcPin, SpiDevice, Delay> { pub struct EPaperDisplay<BusyPin, ResetPin, DcPin, SpiDevice, Delay> {
busy: BusyPin, busy: BusyPin,
@ -27,13 +28,40 @@ pub enum WriteError<DcError, SpiError> {
SpiError(SpiError), SpiError(SpiError),
} }
impl< pub struct Frame([u8; EPD_ARRAY]);
BusyPin: InputPin,
ResetPin: OutputPin, impl Frame {
DcPin: OutputPin, pub const fn new_white() -> Self {
Spi: SpiDevice, Self([0xff; EPD_ARRAY])
Delay: DelayNs, }
> EPaperDisplay<BusyPin, ResetPin, DcPin, Spi, Delay>
pub const fn new_black() -> Self {
Self([0x00; EPD_ARRAY])
}
}
pub struct DoubleFrame {
old: Frame,
new: Frame,
}
pub enum PixelColour {
Black = 0,
White = 1,
}
impl DoubleFrame {
pub fn new(old: Frame, new: Frame) -> Self {
Self { old, new }
}
pub fn draw_pixel(&mut self, x: usize, y: usize, colour: PixelColour) {
}
}
impl<BusyPin: InputPin, ResetPin: OutputPin, DcPin: OutputPin, Spi: SpiDevice, Delay: DelayNs>
EPaperDisplay<BusyPin, ResetPin, DcPin, Spi, Delay>
{ {
pub fn new( pub fn new(
busy: BusyPin, busy: BusyPin,
@ -54,22 +82,26 @@ impl<
fn write_command(&mut self, byte: u8) -> Result<(), WriteError<DcPin::Error, Spi::Error>> { fn write_command(&mut self, byte: u8) -> Result<(), WriteError<DcPin::Error, Spi::Error>> {
self.dc.set_low().map_err(WriteError::DcError)?; self.dc.set_low().map_err(WriteError::DcError)?;
self.spi.transaction(&mut [ self.spi
Operation::DelayNs(60), .transaction(&mut [
Operation::Write(&[byte]), Operation::DelayNs(60),
Operation::DelayNs(20), Operation::Write(&[byte]),
]).map_err(WriteError::SpiError)?; Operation::DelayNs(20),
])
.map_err(WriteError::SpiError)?;
self.delay.delay_ns(40); self.delay.delay_ns(40);
Ok(()) Ok(())
} }
fn write_data(&mut self, byte: u8) -> Result<(), WriteError<DcPin::Error, Spi::Error>> { fn write_data(&mut self, byte: u8) -> Result<(), WriteError<DcPin::Error, Spi::Error>> {
self.dc.set_high().map_err(WriteError::DcError)?; self.dc.set_high().map_err(WriteError::DcError)?;
self.spi.transaction(&mut [ self.spi
Operation::DelayNs(60), .transaction(&mut [
Operation::Write(&[byte]), Operation::DelayNs(60),
Operation::DelayNs(20), Operation::Write(&[byte]),
]).map_err(WriteError::SpiError)?; Operation::DelayNs(20),
])
.map_err(WriteError::SpiError)?;
self.delay.delay_ns(40); self.delay.delay_ns(40);
Ok(()) Ok(())
} }
@ -107,4 +139,20 @@ impl<
self.delay.delay_ms(1); self.delay.delay_ms(1);
self.wait_for_display(); self.wait_for_display();
} }
pub fn draw_full_frame(&mut self, double_frame: &mut DoubleFrame) {
self.write_command(0x10);
for byte in double_frame.old.0 {
self.write_data(byte);
}
self.write_command(0x13);
for byte in double_frame.new.0 {
self.write_data(byte);
}
self.write_command(0x12);
double_frame.old.0 = double_frame.new.0;
self.delay.delay_ms(1);
self.wait_for_display();
}
} }