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extern crate embedded_hal;
use embedded_hal::blocking::spi::Write;
use embedded_hal::digital::v2::OutputPin;
use crate::{Command, DataError, MAX_DISPLAYS};
pub trait Connector {
fn devices(&self) -> usize;
fn write_data(&mut self, addr: usize, command: Command, data: u8) -> Result<(), DataError> {
self.write_raw(addr, command as u8, data)
}
fn write_raw(&mut self, addr: usize, header: u8, data: u8) -> Result<(), DataError>;
}
pub struct PinConnector<DATA, CS, SCK>
where
DATA: OutputPin,
CS: OutputPin,
SCK: OutputPin,
{
devices: usize,
buffer: [u8; MAX_DISPLAYS * 2],
data: DATA,
cs: CS,
sck: SCK,
}
impl<DATA, CS, SCK> PinConnector<DATA, CS, SCK>
where
DATA: OutputPin,
CS: OutputPin,
SCK: OutputPin,
{
pub(crate) fn new(displays: usize, data: DATA, cs: CS, sck: SCK) -> Self {
PinConnector {
devices: displays,
buffer: [0; MAX_DISPLAYS * 2],
data,
cs,
sck,
}
}
}
impl<DATA, CS, SCK> Connector for PinConnector<DATA, CS, SCK>
where
DATA: OutputPin,
CS: OutputPin,
SCK: OutputPin,
{
fn devices(&self) -> usize {
self.devices
}
fn write_raw(&mut self, addr: usize, header: u8, data: u8) -> Result<(), DataError> {
let offset = addr * 2;
let max_bytes = self.devices * 2;
self.buffer = [0; MAX_DISPLAYS * 2];
self.buffer[offset] = header;
self.buffer[offset + 1] = data;
self.cs.set_low().map_err(|_| DataError::Pin)?;
for b in 0..max_bytes {
let value = self.buffer[b];
for i in 0..8 {
if value & (1 << (7 - i)) > 0 {
self.data.set_high().map_err(|_| DataError::Pin)?;
} else {
self.data.set_low().map_err(|_| DataError::Pin)?;
}
self.sck.set_high().map_err(|_| DataError::Pin)?;
self.sck.set_low().map_err(|_| DataError::Pin)?;
}
}
self.cs.set_high().map_err(|_| DataError::Pin)?;
Ok(())
}
}
pub struct SpiConnector<SPI>
where
SPI: Write<u8>,
{
devices: usize,
buffer: [u8; MAX_DISPLAYS * 2],
spi: SPI,
}
impl<SPI> SpiConnector<SPI>
where
SPI: Write<u8>,
{
pub(crate) fn new(displays: usize, spi: SPI) -> Self {
SpiConnector {
devices: displays,
buffer: [0; MAX_DISPLAYS * 2],
spi,
}
}
}
impl<SPI> Connector for SpiConnector<SPI>
where
SPI: Write<u8>,
{
fn devices(&self) -> usize {
self.devices
}
fn write_raw(&mut self, addr: usize, header: u8, data: u8) -> Result<(), DataError> {
let offset = addr * 2;
let max_bytes = self.devices * 2;
self.buffer = [0; MAX_DISPLAYS * 2];
self.buffer[offset] = header;
self.buffer[offset + 1] = data;
self.spi
.write(&self.buffer[0..max_bytes])
.map_err(|_| DataError::Spi)?;
Ok(())
}
}
pub struct SpiConnectorSW<SPI, CS>
where
SPI: Write<u8>,
CS: OutputPin,
{
spi_c: SpiConnector<SPI>,
cs: CS,
}
impl<SPI, CS> SpiConnectorSW<SPI, CS>
where
SPI: Write<u8>,
CS: OutputPin,
{
pub(crate) fn new(displays: usize, spi: SPI, cs: CS) -> Self {
SpiConnectorSW {
spi_c: SpiConnector::new(displays, spi),
cs,
}
}
}
impl<SPI, CS> Connector for SpiConnectorSW<SPI, CS>
where
SPI: Write<u8>,
CS: OutputPin,
{
fn devices(&self) -> usize {
self.spi_c.devices
}
fn write_raw(&mut self, addr: usize, header: u8, data: u8) -> Result<(), DataError> {
self.cs.set_low().map_err(|_| DataError::Pin)?;
self.spi_c
.write_raw(addr, header, data)
.map_err(|_| DataError::Spi)?;
self.cs.set_high().map_err(|_| DataError::Pin)?;
Ok(())
}
}