spi mux: remove traits

examples/fpga_config.rs

@@ -79,7 +79,7 @@ fn main() -> ! {
 	// Pre-load the configuration bytes
 	let config_data = include_bytes!("../build/top.bin");
 
-	flash_ice40_fpga(fpga_cfg_spi, fpga_ss, fpga_creset, fpga_cdone, delay, config_data)?;
+	flash_ice40_fpga(fpga_cfg_spi, fpga_ss, fpga_creset, fpga_cdone, delay, config_data).unwrap();
 
 	loop {
 		nop();

src/cpld.rs

@@ -23,12 +23,7 @@ pub struct CPLD<SPI, CS0, CS1, CS2, GPIO> {
     pub(crate) data: cell::RefCell<CPLDData<SPI, CS0, CS1, CS2, GPIO>>,
 }
 
-pub trait SelectChip {
+impl<SPI, CS0, CS1, CS2, GPIO, E> CPLDData<SPI, CS0, CS1, CS2, GPIO>
-    type Error;
-    fn select_chip(&mut self, chip: u8) -> Result<(), Self::Error>;
-}
-
-impl<SPI, CS0, CS1, CS2, GPIO, E> SelectChip for CPLDData<SPI, CS0, CS1, CS2, GPIO>
 where
     SPI: Transfer<u8, Error = E>,
     CS0: OutputPin,
@@ -36,8 +31,7 @@ where
     CS2: OutputPin,
     GPIO: OutputPin,
 {
-    type Error = Error<E>;
+    pub(crate) fn select_chip(&mut self, chip: u8) -> Result<(), 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(),
@@ -52,49 +46,13 @@ where
         }.map_err(|_| Error::CSError)?;
         Ok(())
     }
-}
 
-pub trait IssueIOUpdate {
+    pub(crate) fn issue_io_update(&mut self) -> Result<(), Error<E>> {
-    type Error;
-    fn issue_io_update(&mut self) -> Result<(), Self::Error>;
-}
-
-impl<SPI, CS0, CS1, CS2, GPIO, E> IssueIOUpdate for CPLDData<SPI, CS0, CS1, CS2, GPIO>
-where
-    SPI: Transfer<u8>,
-    CS0: OutputPin,
-    CS1: OutputPin,
-    CS2: OutputPin,
-    GPIO: OutputPin<Error = E>,
-{
-    type Error = Error<E>;
-
-    fn issue_io_update(&mut self) -> Result<(), Self::Error> {
         self.io_update.set_high().map_err(|_| Error::IOUpdateError)?;
         self.io_update.set_low().map_err(|_| Error::IOUpdateError)
     }
 }
 
-pub trait DoOnGetRefMutData<SPI, CS0, CS1, CS2, GPIO> {
-    fn do_on_get_ref_mut_data<R, E>(
-        &self,
-        f: impl FnOnce(cell::RefMut<CPLDData<SPI, CS0, CS1, CS2, GPIO>>) -> Result<R, Error<E>>,
-    ) -> Result<R, Error<E>>;
-}
-
-impl<SPI, CS0, CS1, CS2, GPIO> DoOnGetRefMutData<SPI, CS0, CS1, CS2, GPIO> for CPLD<SPI, CS0, CS1, CS2, GPIO> {
-    fn do_on_get_ref_mut_data<R, E>(
-        &self,
-        f: impl FnOnce(cell::RefMut<CPLDData<SPI, CS0, CS1, CS2, GPIO>>) -> 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, GPIO, E> Transfer<u8> for CPLD<SPI, CS0, CS1, CS2, GPIO>
 where
     SPI: Transfer<u8, Error = E>,
@@ -106,7 +64,7 @@ where
     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))
+        self.data.try_borrow_mut().map_err(|_| Error::GetRefMutDataError)?.spi.transfer(words).map_err(Error::SPI)
     }
 }
 
@@ -140,26 +98,7 @@ impl<SPI, CS0, CS1, CS2, GPIO, E> CPLD<SPI, CS0, CS1, CS2, GPIO> where
     }
 
     // Split SPI into chips, wrapped by Parts struct
-    pub fn split<'a>(&'a self) -> Parts<'a, CPLD<SPI, CS0, CS1, CS2, GPIO>, SPI, CS0, CS1, CS2, GPIO> {
+    pub fn split<'a>(&'a self) -> Parts<'a, SPI, CS0, CS1, CS2, GPIO> {
         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))
-    }
-}
-
-impl<SPI, CS0, CS1, CS2, GPIO, E> CPLD<SPI, CS0, CS1, CS2, GPIO>
-where
-    SPI: Transfer<u8>,
-    CS0: OutputPin,
-    CS1: OutputPin,
-    CS2: OutputPin,
-    GPIO: OutputPin<Error = E>
-{	
-    // Issue I/O Update
-    pub fn issue_io_update(&mut self) -> Result<(), Error<E>> {
-        self.do_on_get_ref_mut_data(|mut dev| dev.issue_io_update())
-    }
 }

src/flash.rs

@@ -13,6 +13,7 @@ use nb::block;
 
 use log::{warn, debug};
 
+#[derive(Debug)]
 pub enum FPGAFlashError {
     SPICommunicationError,
     NegotiationError,

src/spi_slave.rs

@@ -4,53 +4,54 @@ use embedded_hal::{
 };
 use core::marker::PhantomData;
 
-use crate::cpld::{DoOnGetRefMutData, SelectChip, IssueIOUpdate};
+use crate::cpld::CPLD;
 use crate::Error;
 
-pub struct SPISlave<'a, DEV: 'a, SPI, CS0, CS1, CS2, GPIO> (
+pub struct SPISlave<'a, SPI, CS0, CS1, CS2, GPIO> (
-	&'a DEV,
+	// SPI device to be multiplexed
-	u8,			// Channel of SPI slave
+	&'a CPLD<SPI, CS0, CS1, CS2, GPIO>,
-	bool,		// Need I/O Update
+	// Channel of SPI slave
-	PhantomData<(SPI, CS0, CS1, CS2, GPIO)>,
+	u8,
+	// Need I/O Update
+	bool,
 );
 
-pub struct Parts<'a, DEV: 'a, SPI, CS0, CS1, CS2, GPIO> {
+pub struct Parts<'a, SPI, CS0, CS1, CS2, GPIO> {
-	pub spi1: SPISlave<'a, DEV, SPI, CS0, CS1, CS2, GPIO>,
+	pub spi1: SPISlave<'a, SPI, CS0, CS1, CS2, GPIO>,
-	pub spi2: SPISlave<'a, DEV, SPI, CS0, CS1, CS2, GPIO>,
+	pub spi2: SPISlave<'a, SPI, CS0, CS1, CS2, GPIO>,
-	pub spi3: SPISlave<'a, DEV, SPI, CS0, CS1, CS2, GPIO>,
+	pub spi3: SPISlave<'a, SPI, CS0, CS1, CS2, GPIO>,
-	pub spi4: SPISlave<'a, DEV, SPI, CS0, CS1, CS2, GPIO>,
+	pub spi4: SPISlave<'a, SPI, CS0, CS1, CS2, GPIO>,
-	pub spi5: SPISlave<'a, DEV, SPI, CS0, CS1, CS2, GPIO>,
+	pub spi5: SPISlave<'a, SPI, CS0, CS1, CS2, GPIO>,
-	pub spi6: SPISlave<'a, DEV, SPI, CS0, CS1, CS2, GPIO>,
+	pub spi6: SPISlave<'a, SPI, CS0, CS1, CS2, GPIO>,
-	pub spi7: SPISlave<'a, DEV, SPI, CS0, CS1, CS2, GPIO>,
+	pub spi7: SPISlave<'a, SPI, CS0, CS1, CS2, GPIO>,
 }
 
-impl<'a, DEV, SPI, CS0, CS1, CS2, GPIO> Parts<'a, DEV, SPI, CS0, CS1, CS2, GPIO> {
+impl<'a, SPI, CS0, CS1, CS2, GPIO> Parts<'a, SPI, CS0, CS1, CS2, GPIO> {
-	pub(crate) fn new(cpld: &'a DEV) -> Self {
+	pub(crate) fn new(cpld: &'a CPLD<SPI, CS0, CS1, CS2, GPIO>) -> Self {
 		Parts {
-			spi1: SPISlave(&cpld, 1, false, PhantomData),
+			spi1: SPISlave(&cpld, 1, false),
-			spi2: SPISlave(&cpld, 2, false, PhantomData),
+			spi2: SPISlave(&cpld, 2, false),
-			spi3: SPISlave(&cpld, 3, true, PhantomData),
+			spi3: SPISlave(&cpld, 3, true),
-			spi4: SPISlave(&cpld, 4, true, PhantomData),
+			spi4: SPISlave(&cpld, 4, true),
-			spi5: SPISlave(&cpld, 5, true, PhantomData),
+			spi5: SPISlave(&cpld, 5, true),
-			spi6: SPISlave(&cpld, 6, true, PhantomData),
+			spi6: SPISlave(&cpld, 6, true),
-			spi7: SPISlave(&cpld, 7, true, PhantomData),
+			spi7: SPISlave(&cpld, 7, true),
 		}
 	}
 }
 
-impl<'a, DEV, SPI, CS0, CS1, CS2, GPIO, E> Transfer<u8> for SPISlave<'a, DEV, SPI, CS0, CS1, CS2, GPIO>
+impl<'a, SPI, CS0, CS1, CS2, GPIO, E> Transfer<u8> for SPISlave<'a, SPI, CS0, CS1, CS2, GPIO>
 where
 	CS2: OutputPin,
 	CS1: OutputPin,
 	CS0: OutputPin,
-	DEV: DoOnGetRefMutData<SPI, CS0, CS1, CS2, GPIO>,
 	SPI: Transfer<u8, Error = E>,
 	GPIO: OutputPin,
 {
 	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(move |mut dev| {
+		let mut dev = self.0.data.try_borrow_mut().map_err(|_| Error::GetRefMutDataError)?;
 		dev.select_chip(self.1).map_err(|_| Error::CSError)?;
 		let result = dev.spi.transfer(words).map_err(Error::SPI)?;
 		dev.select_chip(0).map_err(|_| Error::CSError)?;
@@ -58,6 +59,5 @@ where
 			dev.issue_io_update().map_err(|_| Error::IOUpdateError)?;
 		}
 		Ok(result)
-		})	
 	}
 }