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#![no_std]
use core::marker::PhantomData;
use embedded_hal as hal;
use hal::digital::v2::OutputPin;
use display_interface::{DisplayError, WriteOnlyDataCommand};
pub struct SPIInterface<SPI, DC, CS> {
spi: SPI,
dc: DC,
cs: CS,
}
impl<SPI, DC, CS> SPIInterface<SPI, DC, CS>
where
SPI: hal::blocking::spi::Write<u8>,
DC: OutputPin,
CS: OutputPin,
{
pub fn new(spi: SPI, dc: DC, cs: CS) -> Self {
Self { spi, dc, cs }
}
}
impl<SPI, DC, CS, WIDTH> WriteOnlyDataCommand<WIDTH> for SPIInterface<SPI, DC, CS>
where
SPI: hal::blocking::spi::Write<WIDTH>,
DC: OutputPin,
CS: OutputPin,
{
fn send_commands(&mut self, cmds: &[WIDTH]) -> Result<(), DisplayError> {
self.cs.set_low().map_err(|_| DisplayError::CSError)?;
self.dc.set_low().map_err(|_| DisplayError::DCError)?;
let err = self
.spi
.write(&cmds)
.map_err(|_| DisplayError::BusWriteError);
self.cs.set_high().ok();
err
}
fn send_data(&mut self, buf: &[WIDTH]) -> Result<(), DisplayError> {
self.cs.set_low().map_err(|_| DisplayError::CSError)?;
self.dc.set_high().map_err(|_| DisplayError::DCError)?;
let err = self
.spi
.write(&buf)
.map_err(|_| DisplayError::BusWriteError);
self.cs.set_high().ok();
err
}
}
pub struct SPIInterfaceNoCS<SPI, DC, WIDTH> {
spi: SPI,
dc: DC,
_width: PhantomData<WIDTH>,
}
impl<SPI, DC, WIDTH> SPIInterfaceNoCS<SPI, DC, WIDTH>
where
SPI: hal::blocking::spi::Write<WIDTH>,
DC: OutputPin,
{
pub fn new(spi: SPI, dc: DC) -> Self {
Self {
spi,
dc,
_width: PhantomData,
}
}
}
impl<SPI, DC, WIDTH> WriteOnlyDataCommand<WIDTH> for SPIInterfaceNoCS<SPI, DC, WIDTH>
where
SPI: hal::blocking::spi::Write<WIDTH>,
DC: OutputPin,
{
fn send_commands(&mut self, cmds: &[WIDTH]) -> Result<(), DisplayError> {
self.dc.set_low().map_err(|_| DisplayError::DCError)?;
self.spi
.write(&cmds)
.map_err(|_| DisplayError::BusWriteError)
}
fn send_data(&mut self, buf: &[WIDTH]) -> Result<(), DisplayError> {
self.dc.set_high().map_err(|_| DisplayError::DCError)?;
self.spi
.write(&buf)
.map_err(|_| DisplayError::BusWriteError)
}
}