lib: derive debug for error for unwrapping

Cargo.toml

@@ -5,8 +5,9 @@ description = "Embbeded Rust Ethernet driver for ENC424J600 Ethernet controller
 authors = ["Harry Ho <hh@m-labs.hk>"]
 version = "0.1.0"
 keywords = ["ethernet", "eth", "enc424j600", "stm32", "stm32f4xx"]
-repository = "https://github.com/smoltcp-rs/ENC424J600"
+repository = "https://git.m-labs.hk/M-Labs/ENC424J600"
 edition = "2018"
+license = "BSD-2-Clause"
 
 [dependencies]
 volatile-register = "0.2"

src/lib.rs

@@ -16,7 +16,7 @@ pub mod tx;
 pub mod smoltcp_phy;
 
 /// Max raw frame array size
-pub const RAW_FRAME_LENGTH_MAX: usize = 0x1000;
+pub const RAW_FRAME_LENGTH_MAX: usize = 1518;
 
 pub trait EthController {
     fn init_dev(&mut self, delay: &mut impl DelayUs<u16>) -> Result<(), EthControllerError>;
@@ -29,6 +29,7 @@ pub trait EthController {
 }
 
 /// TODO: Improve these error types
+#[derive(Debug)]
 pub enum EthControllerError {
     SpiPortError,
     GeneralError,

src/spi.rs

@@ -131,13 +131,17 @@ impl <SPI: Transfer<u8>,
         match self.spi.transfer(&mut buf) {
             Ok(_) => {
                 // Disable chip select
+                cortex_m::asm::delay(10_u32);
                 self.nss.set_high();
+                cortex_m::asm::delay(4_u32);
                 Ok(buf[2])
             },
             // TODO: Maybe too naive?
             Err(_) => {
                 // Disable chip select
+                cortex_m::asm::delay(10_u32);
                 self.nss.set_high();
+                cortex_m::asm::delay(4_u32);
                 Err(SpiPortError::TransferError)
             }
         }