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#![no_std]
use embedded_hal::blocking::spi::{Transfer, Write};
use embedded_hal::digital::v2::OutputPin;
use evegfx::interface::Interface;
pub struct EVEHALSPIInterface<SPI, CS>
where
SPI: Transfer<u8>,
CS: OutputPin,
{
spi: SPI,
cs: CS,
}
impl<SPI, CS> EVEHALSPIInterface<SPI, CS>
where
SPI: Transfer<u8> + Write<u8>,
CS: OutputPin,
{
pub fn new(spi: SPI, cs: CS) -> Self {
Self { spi: spi, cs: cs }
}
fn with_cs<F, R>(&mut self, func: F) -> Result<R, <Self as Interface>::Error>
where
F: FnOnce(&mut Self) -> Result<R, <Self as Interface>::Error>,
{
self.spi_select()?;
let result = func(self);
self.spi_unselect()?;
result
}
fn spi_select(&mut self) -> Result<(), <Self as Interface>::Error> {
<Self as Interface>::Error::cs_result(self.cs.set_low())
}
fn spi_unselect(&mut self) -> Result<(), <Self as Interface>::Error> {
<Self as Interface>::Error::cs_result(self.cs.set_high())
}
fn spi_write(&mut self, words: &[u8]) -> Result<(), <Self as Interface>::Error> {
let r = self.spi.write(words);
self.spi_write_result(r)
}
fn spi_transfer<'w>(
&mut self,
words: &'w mut [u8],
) -> Result<&'w [u8], <Self as Interface>::Error> {
let r = self.spi.transfer(words);
self.spi_transfer_result(r)
}
fn spi_write_result<T>(
&self,
r: Result<T, <SPI as Write<u8>>::Error>,
) -> Result<T, <Self as Interface>::Error> {
<Self as Interface>::Error::spi_write_result(r)
}
fn spi_transfer_result<T>(
&self,
r: Result<T, <SPI as Transfer<u8>>::Error>,
) -> Result<T, <Self as Interface>::Error> {
<Self as Interface>::Error::spi_transfer_result(r)
}
}
impl<SPI, CS> Interface for EVEHALSPIInterface<SPI, CS>
where
SPI: Transfer<u8> + Write<u8>,
CS: OutputPin,
{
type Error = EVEHALSPIError<<SPI as Write<u8>>::Error, <SPI as Transfer<u8>>::Error, CS::Error>;
fn begin_write(&mut self, addr: u32) -> Result<(), Self::Error> {
self.spi_select()?;
let mut addr_words: [u8; 3] = [0; 3];
self.build_write_header(addr, &mut addr_words);
self.spi_write(&addr_words)
}
fn continue_write(&mut self, v: &[u8]) -> Result<(), Self::Error> {
self.spi_write(v)
}
fn end_write(&mut self) -> Result<(), Self::Error> {
self.spi_unselect()
}
fn begin_read(&mut self, addr: u32) -> Result<(), Self::Error> {
self.spi_select()?;
let mut addr_words: [u8; 4] = [0; 4];
self.build_read_header(addr, &mut addr_words);
self.spi_write(&addr_words)
}
fn continue_read(&mut self, into: &mut [u8]) -> Result<(), Self::Error> {
self.spi_transfer(into)?;
Ok(())
}
fn end_read(&mut self) -> Result<(), Self::Error> {
self.spi_unselect()
}
fn host_cmd(&mut self, cmd: u8, a0: u8, a1: u8) -> Result<(), Self::Error> {
let mut cmd_words: [u8; 3] = [0; 3];
self.build_host_cmd_msg(cmd, a0, a1, &mut cmd_words);
self.with_cs(|ei| ei.spi_write(&cmd_words))
}
}
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum EVEHALSPIError<SPIWriteError, SPITransferError, CSError> {
SPIWrite(SPIWriteError),
SPITransfer(SPITransferError),
CS(CSError),
}
impl<SPIWriteError, SPITransferError, CSError>
EVEHALSPIError<SPIWriteError, SPITransferError, CSError>
{
fn spi_write_result<T>(r: Result<T, SPIWriteError>) -> Result<T, Self> {
match r {
Ok(v) => Ok(v),
Err(e) => Err(Self::SPIWrite(e)),
}
}
fn spi_transfer_result<T>(r: Result<T, SPITransferError>) -> Result<T, Self> {
match r {
Ok(v) => Ok(v),
Err(e) => Err(Self::SPITransfer(e)),
}
}
fn cs_result<T>(r: Result<T, CSError>) -> Result<T, Self> {
match r {
Ok(v) => Ok(v),
Err(e) => Err(Self::CS(e)),
}
}
}