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cpld: spi slave WIP

pull/4/head
occheung 2020-08-10 17:04:40 +08:00
parent 8e7fe971cb
commit a406dea0c7
3 changed files with 181 additions and 26 deletions
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135
src/cpld.rs
View File

@ -7,61 +7,144 @@ use stm32h7xx_hal::{
OutputPin,
},
blocking::spi::Transfer,
spi::FullDuplex,
},
pac,
prelude::*,
spi,
};
use core::cell;
use cortex_m;
use cortex_m::asm::nop;
use cortex_m_semihosting::hprintln;
use nb::block;
use super::{Parts};
/*
* Enum for structuring error
*/
#[derive(Debug)]
pub enum Error<E> {
SPI(E),
CSError,
GetRefMutDataError,
}
/*
* Basic structure for CPLD signal multiplexing
*/
pub struct CPLD<SPI, CS0, CS1, CS2> {
spi: SPI,
chip_select: (CS0, CS1, CS2),
#[derive(Debug)]
pub struct CPLDData<SPI, CS0, CS1, CS2> {
pub(crate) spi: SPI,
pub(crate) chip_select: (CS0, CS1, CS2),
}
impl<SPI, CS0, CS1, CS2> CPLD<SPI, CS0, CS1, CS2> where
SPI: Transfer<u8>,
#[derive(Debug)]
pub struct CPLD<SPI, CS0, CS1, CS2> {
pub(crate) data: cell::RefCell<CPLDData<SPI, CS0, CS1, CS2>>,
}
pub trait SelectChip {
type Error;
fn select_chip(&mut self, channel: u8) -> Result<(), Self::Error>;
}
impl<SPI, CS0, CS1, CS2, E> SelectChip for CPLDData<SPI, CS0, CS1, CS2>
where
SPI: Transfer<u8, Error = E>,
CS0: OutputPin,
CS1: OutputPin,
CS2: OutputPin,
{
type Error = Error<E>;
fn select_chip(&mut self, chip: u8) -> Result<(), Self::Error> {
match chip & (1 << 0) {
0 => self.chip_select.0.set_low(),
_ => self.chip_select.0.set_high(),
}.map_err(|_| Error::CSError)?;
match chip & (1 << 1) {
0 => self.chip_select.1.set_low(),
_ => self.chip_select.1.set_high(),
}.map_err(|_| Error::CSError)?;
match chip & (1 << 2) {
0 => self.chip_select.2.set_low(),
_ => self.chip_select.2.set_high(),
}.map_err(|_| Error::CSError)?;
Ok(())
}
}
pub trait DoOnGetRefMutData<SPI, CS0, CS1, CS2> {
fn do_on_get_ref_mut_data<R, E>(
&mut self,
f: impl FnOnce(cell::RefMut<CPLDData<SPI, CS0, CS1, CS2>>) -> Result<R, Error<E>>,
) -> Result<R, Error<E>>;
}
impl<SPI, CS0, CS1, CS2> DoOnGetRefMutData<SPI, CS0, CS1, CS2> for CPLD<SPI, CS0, CS1, CS2> {
fn do_on_get_ref_mut_data<R, E>(
&mut self,
f: impl FnOnce(cell::RefMut<CPLDData<SPI, CS0, CS1, CS2>>) -> Result<R, Error<E>>,
) -> Result<R, Error<E>> {
let dev = self
.data
.try_borrow_mut()
.map_err(|_| Error::GetRefMutDataError)?;
f(dev)
}
}
impl<SPI, CS0, CS1, CS2, E> Transfer<u8> for CPLD<SPI, CS0, CS1, CS2>
where
SPI: Transfer<u8, Error = E>,
CS0: OutputPin,
CS1: OutputPin,
CS2: OutputPin,
{
type Error = Error<E>;
fn transfer<'w>(&mut self, words: &'w mut [u8]) -> Result<&'w [u8], Self::Error> {
self.do_on_get_ref_mut_data(move |mut dev| dev.spi.transfer(words).map_err(Error::SPI))
}
}
impl<SPI, CS0, CS1, CS2, E> CPLD<SPI, CS0, CS1, CS2> where
SPI: Transfer<u8, Error = E>,
CS0: OutputPin,
CS1: OutputPin,
CS2: OutputPin,
{
// Constructor for CPLD
pub fn new(spi: SPI, chip_select: (CS0, CS1, CS2)) -> Self {
// Init CS to be 0
let mut obj = Self{spi, chip_select};
obj.select_chip(0);
return obj
// Init data
let data = CPLDData {
spi,
chip_select,
};
// Init CPLD
CPLD {
data: cell::RefCell::new(data),
}
}
// Select chip
pub fn select_chip(&mut self, channel: u8) {
match channel & (1 << 0) {
0 => self.chip_select.0.set_low(),
_ => self.chip_select.0.set_high(),
}.ok();
match channel & (1 << 1) {
0 => self.chip_select.1.set_low(),
_ => self.chip_select.1.set_high(),
}.ok();
match channel & (1 << 2) {
0 => self.chip_select.2.set_low(),
_ => self.chip_select.2.set_high(),
}.ok();
// Destroy the wrapper, return the CPLD data
pub fn destroy(self) -> (SPI, (CS0, CS1, CS2)) {
let cpld = self.data.into_inner();
(cpld.spi, cpld.chip_select)
}
// Return the SPI and CS pins
pub fn release(self) -> (SPI, (CS0, CS1, CS2)) {
return (self.spi, self.chip_select);
// Split SPI into chips, wrapped by Parts struct
pub fn split<'a>(&'a self) -> Parts<'a, CPLD<SPI, CS0, CS1, CS2>, SPI, CS0, CS1, CS2> {
Parts::new(&self)
}
// Select Chip
pub fn select_chip(&mut self, channel: u8) -> Result<(), Error<E>> {
self.do_on_get_ref_mut_data(|mut dev| dev.select_chip(channel))
}
}

7
src/lib.rs Normal file
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@ -0,0 +1,7 @@
#![no_std]
mod cpld;
pub use cpld::{CPLD, Error};
mod spi_slave;
pub use spi_slave::{SPISlave, Parts};

65
src/spi_slave.rs Normal file
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@ -0,0 +1,65 @@
use stm32h7xx_hal::{
hal::{
digital::v2::{
InputPin,
OutputPin,
},
blocking::spi::Transfer,
},
pac,
prelude::*,
spi,
};
use core::marker::PhantomData;
use crate::cpld::{DoOnGetRefMutData, Error, SelectChip};
pub struct SPISlave<'a, DEV: 'a, SPI, CS0, CS1, CS2> (
&'a DEV,
u8,
PhantomData<(SPI, CS0, CS1, CS2)>,
);
pub struct Parts<'a, DEV: 'a, SPI, CS0, CS1, CS2> {
pub spi1: SPISlave<'a, DEV, SPI, CS0, CS1, CS2>,
pub spi2: SPISlave<'a, DEV, SPI, CS0, CS1, CS2>,
pub spi3: SPISlave<'a, DEV, SPI, CS0, CS1, CS2>,
pub spi4: SPISlave<'a, DEV, SPI, CS0, CS1, CS2>,
pub spi5: SPISlave<'a, DEV, SPI, CS0, CS1, CS2>,
pub spi6: SPISlave<'a, DEV, SPI, CS0, CS1, CS2>,
pub spi7: SPISlave<'a, DEV, SPI, CS0, CS1, CS2>,
}
impl<'a, DEV, SPI, CS0, CS1, CS2> Parts<'a, DEV, SPI, CS0, CS1, CS2> {
pub(crate) fn new(cpld: &'a DEV) -> Self {
Parts {
// spi0: SPISlave(&cpld, 0, PhantomData),
spi1: SPISlave(&cpld, 1, PhantomData),
spi2: SPISlave(&cpld, 2, PhantomData),
spi3: SPISlave(&cpld, 3, PhantomData),
spi4: SPISlave(&cpld, 4, PhantomData),
spi5: SPISlave(&cpld, 5, PhantomData),
spi6: SPISlave(&cpld, 6, PhantomData),
spi7: SPISlave(&cpld, 7, PhantomData),
}
}
}
impl<'a, DEV, SPI, CS0, CS1, CS2, E> Transfer<u8> for SPISlave<'a, DEV, SPI, CS0, CS1, CS2>
where
CS2: OutputPin,
CS1: OutputPin,
CS0: OutputPin,
DEV: DoOnGetRefMutData<SPI, CS0, CS1, CS2>,
SPI: Transfer<u8, Error = E>,
{
type Error = Error<E>;
fn transfer<'w>(&mut self, words: &'w mut[u8]) -> Result<&'w [u8], Self::Error> {
self.0.do_on_get_ref_mut_data(|mut dev| {
dev.select_chip(self.1)
})?;
self.0.do_on_get_ref_mut_data(move |mut dev| dev.spi.transfer(words).map_err(Error::SPI))
}
}