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Add packet RX

This commit is contained in:
Harry Ho 2020-06-16 17:34:16 +08:00
parent 4e4267e55a
commit 9b48a585cf
4 changed files with 376 additions and 25 deletions
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4
Cargo.toml
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@ -13,10 +13,10 @@ volatile-register = "0.2"
aligned = "0.3"
stm32f4xx-hal = { version = "0.8" , optional = true }
smoltcp = { version = "0.6.0", default-features = false, features = ["proto-ipv4", "proto-ipv6", "socket-icmp", "socket-udp", "socket-tcp", "log", "verbose", "ethernet"], optional = true }
log = { version = "0.4", optional = true }
log = { version = "0.4" }
[features]
smoltcp-phy = ["smoltcp", "log"]
smoltcp-phy = ["smoltcp"]
stm32f407 = ["stm32f4xx-hal/stm32f407"]
default = []

151
src/lib.rs
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@ -1,4 +1,155 @@
#![no_std]
use core::fmt;
/// STM32F4xx-HAL specific implementations
pub mod spi;
use stm32f4xx_hal::{
hal::{
blocking::spi::Transfer,
digital::v2::OutputPin,
}
};
pub mod rx;
#[cfg(feature="smoltcp")]
pub mod smoltcp_phy;
pub trait EthController {
fn init_dev(&mut self) -> Result<(), EthControllerError>;
fn init_rxbuf(&mut self) -> Result<(), EthControllerError>;
fn receive_next(&mut self) -> Result<rx::RxPacket, EthControllerError>;
fn set_promiscuous(&mut self) -> Result<(), EthControllerError>;
fn read_from_mac(&mut self, mac: &mut [u8]) -> Result<(), EthControllerError>;
}
/// TODO: Improve these error types
pub enum EthControllerError {
SpiPortError,
GeneralError
}
impl From<spi::SpiPortError> for EthControllerError {
fn from(e: spi::SpiPortError) -> EthControllerError {
EthControllerError::SpiPortError
}
}
/// Ethernet controller using SPI interface
pub struct SpiEth<SPI: Transfer<u8>,
NSS: OutputPin> {
spi_port: spi::SpiPort<SPI, NSS>,
rx_buf: rx::RxBuffer
}
impl <SPI: Transfer<u8>,
NSS: OutputPin> SpiEth<SPI, NSS> {
pub fn new(spi: SPI, mut nss: NSS) -> Self {
SpiEth {
spi_port: spi::SpiPort::new(spi, nss),
rx_buf: rx::RxBuffer::new(),
// TODO: tx_buf
}
}
}
impl <SPI: Transfer<u8>,
NSS: OutputPin> EthController for SpiEth<SPI, NSS> {
fn init_dev(&mut self) -> Result<(), EthControllerError> {
// Write 0x1234 to EUDAST
self.spi_port.write_reg_16b(spi::EUDAST, 0x1234)?;
// Verify that EUDAST is 0x1234
let mut eudast = self.spi_port.read_reg_16b(spi::EUDAST)?;
if eudast != 0x1234 {
return Err(EthControllerError::GeneralError)
}
// Poll CLKRDY (ESTAT<12>) to check if it is set
loop {
let estat = self.spi_port.read_reg_16b(spi::ESTAT)?;
if estat & 0x1000 == 0x1000 { break }
}
// Set ETHRST (ECON2<4>) to 1
let econ2 = self.spi_port.read_reg_8b(spi::ECON2)?;
self.spi_port.write_reg_8b(spi::ECON2, 0x10 | (econ2 & 0b11101111))?;
// Verify that EUDAST is 0x0000
eudast = self.spi_port.read_reg_16b(spi::EUDAST)?;
if eudast != 0x0000 {
return Err(EthControllerError::GeneralError)
}
Ok(())
}
fn init_rxbuf(&mut self) -> Result<(), EthControllerError> {
// Set ERXST pointer
self.spi_port.write_reg_16b(spi::ERXST, self.rx_buf.get_wrap_addr());
// Set ERXTAIL pointer
self.spi_port.write_reg_16b(spi::ERXTAIL, self.rx_buf.get_tail_addr());
// Set MAMXFL to maximum number of bytes in each accepted packet
self.spi_port.write_reg_16b(spi::MAMXFL, rx::RAW_FRAME_LENGTH_MAX as u16);
// Enable RXEN (ECON1<0>)
let econ1 = self.spi_port.read_reg_16b(spi::ECON1)?;
self.spi_port.write_reg_16b(spi::ECON1, 0x1 | (econ1 & 0xfffe));
Ok(())
}
/// Receive the next packet
fn receive_next(&mut self) -> Result<rx::RxPacket, EthControllerError> {
// Poll PKTIF (EIR<4>) to check if it is set
loop {
let eir = self.spi_port.read_reg_16b(spi::EIR)?;
if eir & 0x40 == 0x40 { break }
}
// Set ERXRDPT pointer to next_addr
self.spi_port.write_reg_16b(spi::ERXRDPT, self.rx_buf.get_next_addr())?;
// Read 2 bytes to update next_addr
let mut next_addr_buf = [0; 3];
self.spi_port.read_rxdat(&mut next_addr_buf, 2)?;
self.rx_buf.set_next_addr((next_addr_buf[1] as u16) | ((next_addr_buf[2] as u16) << 8));
// Read 6 bytes to update rsv
let mut rsv_buf = [0; 7];
self.spi_port.read_rxdat(&mut rsv_buf, 6)?;
// Construct an RxPacket
// TODO: can we directly assign to fields instead of using functions?
let mut rx_packet = rx::RxPacket::new();
// Get and update frame length
rx_packet.write_to_rsv(&rsv_buf[1..]);
rx_packet.update_frame_length();
// Read frame bytes
let mut frame_buf = [0; rx::RAW_FRAME_LENGTH_MAX];
self.spi_port.read_rxdat(&mut frame_buf, rx_packet.get_frame_length() as u32)?;
rx_packet.write_to_frame(&frame_buf[1..]);
// Set ERXTAIL pointer to (next_addr - 2)
if self.rx_buf.get_next_addr() > rx::ERXST_DEFAULT {
self.spi_port.write_reg_16b(spi::ERXTAIL, self.rx_buf.get_next_addr() - 2)?;
} else {
self.spi_port.write_reg_16b(spi::ERXTAIL, rx::RX_MAX_ADDRESS - 1)?;
}
// Set PKTDEC to decrement PKTCNT
let econ1_hi = self.spi_port.read_reg_8b(spi::ECON1 + 1)?;
self.spi_port.write_reg_8b(spi::ECON1 + 1, 0x01 | (econ1_hi & 0xfe))?;
// Return the RxPacket
Ok(rx_packet)
}
/// Set controller to Promiscuous Mode
fn set_promiscuous(&mut self) -> Result<(), EthControllerError> {
// From ENC424J600 Data Sheet Section 10.12:
// "To accept all incoming frames regardless of content (Promiscuous mode),
// set the CRCEN, RUNTEN, UCEN, NOTMEEN and MCEN bits."
let mut erxfcon_lo = self.spi_port.read_reg_8b(spi::ERXFCON)?;
self.spi_port.write_reg_8b(spi::ERXFCON, 0b0101_1110 | (erxfcon_lo & 0b1010_0001));
Ok(())
}
/// Read MAC to [u8; 6]
fn read_from_mac(&mut self, mac: &mut [u8]) -> Result<(), EthControllerError> {
mac[0] = self.spi_port.read_reg_8b(spi::MAADR1)?;
mac[1] = self.spi_port.read_reg_8b(spi::MAADR1 + 1)?;
mac[2] = self.spi_port.read_reg_8b(spi::MAADR2)?;
mac[3] = self.spi_port.read_reg_8b(spi::MAADR2 + 1)?;
mac[4] = self.spi_port.read_reg_8b(spi::MAADR3)?;
mac[5] = self.spi_port.read_reg_8b(spi::MAADR3 + 1)?;
Ok(())
}
}

125
src/rx.rs Normal file
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@ -0,0 +1,125 @@
/// SRAM Addresses
pub const ERXST_DEFAULT: u16 = 0x5340;
pub const ERXTAIL_DEFAULT: u16 = 0x5ffe;
pub const RX_MAX_ADDRESS: u16 = 0x5fff;
/// Max raw frame array size
pub const RAW_FRAME_LENGTH_MAX: usize = 0x1000;
/// Receive Status Vector Length
pub const RSV_LENGTH: usize = 6;
/// Struct for RX Buffer
/// TODO: Should be a singleton
pub struct RxBuffer {
wrap_addr: u16,
next_addr: u16,
tail_addr: u16
}
impl RxBuffer {
pub fn new() -> Self {
RxBuffer {
wrap_addr: ERXST_DEFAULT,
next_addr: ERXST_DEFAULT,
tail_addr: ERXTAIL_DEFAULT
}
}
pub fn set_wrap_addr(&mut self, addr: u16) {
self.wrap_addr = addr;
}
pub fn get_wrap_addr(& self) -> u16{
self.wrap_addr
}
pub fn set_next_addr(&mut self, addr: u16) {
self.next_addr = addr;
}
pub fn get_next_addr(& self) -> u16{
self.next_addr
}
pub fn set_tail_addr(&mut self, addr: u16) {
self.tail_addr = addr;
}
pub fn get_tail_addr(& self) -> u16{
self.tail_addr
}
}
/// Struct for RX Packet
/// TODO: Generalise MAC addresses
pub struct RxPacket {
rsv: Rsv,
frame: [u8; RAW_FRAME_LENGTH_MAX],
frame_length: usize
}
impl RxPacket {
pub fn new() -> Self {
RxPacket {
rsv: Rsv::new(),
frame: [0; RAW_FRAME_LENGTH_MAX],
frame_length: 0
}
}
pub fn write_to_rsv(&mut self, raw_rsv: &[u8]) {
self.rsv.write_to_rsv(raw_rsv);
}
pub fn read_raw_rsv(&self) -> &[u8] {
self.rsv.read_raw_rsv()
}
pub fn update_frame_length(&mut self) {
self.rsv.set_frame_length();
self.frame_length = self.rsv.get_frame_length() as usize;
}
pub fn get_frame_length(&self) -> usize {
self.frame_length
}
pub fn write_to_frame(&mut self, raw_frame: &[u8]) {
for i in 0..self.frame_length {
self.frame[i] = raw_frame[i];
}
}
pub fn get_frame_byte(&self, i: usize) -> u8 {
self.frame[i]
}
}
/// Struct for Receive Status Vector
/// See: Table 9-1, ENC424J600 Data Sheet
struct Rsv {
raw_rsv: [u8; RSV_LENGTH],
// TODO: Add more definitions
frame_length: u16
}
impl Rsv {
fn new() -> Self {
Rsv {
raw_rsv: [0; RSV_LENGTH],
frame_length: 0_u16
}
}
fn write_to_rsv(&mut self, raw_rsv: &[u8]) {
for i in 0..RSV_LENGTH {
self.raw_rsv[i] = raw_rsv[i];
}
}
fn read_raw_rsv(&self) -> &[u8] {
&self.raw_rsv
}
fn set_frame_length(&mut self) {
self.frame_length = (self.raw_rsv[0] as u16) | ((self.raw_rsv[1] as u16) << 8);
}
fn get_frame_length(&self) -> u16 {
self.frame_length
}
}

115
src/spi.rs
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@ -7,6 +7,10 @@ use stm32f4xx_hal::{
time::MegaHertz,
spi,
};
///
/// FIXME: Move the following to somewhere else
///
use crate::rx;
/// Must use SPI mode cpol=0, cpha=0
pub const SPI_MODE: spi::Mode = spi::Mode {
@ -17,8 +21,29 @@ pub const SPI_MODE: spi::Mode = spi::Mode {
pub const SPI_CLOCK: MegaHertz = MegaHertz(14);
/// SPI Opcodes
const RCRU: u8 = 0b00100000;
const WCRU: u8 = 0b00100010;
const RCRU: u8 = 0b0010_0000;
const WCRU: u8 = 0b0010_0010;
const ERXDATA: u8 = 0b0010_1100; // Treated as 8-bit opcode followed by data
/// SPI Register Mapping
/// Note: PSP interface use different address mapping
// SPI Init Reset Registers
pub const EUDAST: u8 = 0x16; // 16-bit data
pub const ESTAT: u8 = 0x1a; // 16-bit data
pub const ECON2: u8 = 0x6e; // 16-bit data
//
pub const ERXFCON: u8 = 0x34; // 16-bit data
//
pub const MAADR3: u8 = 0x60; // 16-bit data
pub const MAADR2: u8 = 0x62; // 16-bit data
pub const MAADR1: u8 = 0x64; // 16-bit data
// RX Registers
pub const ERXRDPT: u8 = 0x8a; // 16-bit data
pub const ERXST: u8 = 0x04; // 16-bit data
pub const ERXTAIL: u8 = 0x06; // 16-bit data
pub const EIR: u8 = 0x1c; // 16-bit data
pub const ECON1: u8 = 0x1e; // 16-bit data
pub const MAMXFL: u8 = 0x4a; // 16-bit data
/// Struct for SPI I/O interface on ENC424J600
/// Note: stm32f4xx_hal::spi's pins include: SCK, MISO, MOSI
@ -28,9 +53,12 @@ pub struct SpiPort<SPI: Transfer<u8>,
nss: NSS,
}
impl <SPI: Transfer<u8, Error = E>,
NSS: OutputPin,
E: fmt::Debug> SpiPort<SPI, NSS> {
pub enum SpiPortError {
TransferError
}
impl <SPI: Transfer<u8>,
NSS: OutputPin> SpiPort<SPI, NSS> {
// TODO: return as Result()
pub fn new(spi: SPI, mut nss: NSS) -> Self {
nss.set_high();
@ -41,29 +69,44 @@ impl <SPI: Transfer<u8, Error = E>,
}
}
pub fn read_reg_8b(&mut self, addr: u8) -> Result<u8, SPI::Error> {
pub fn read_reg_8b(&mut self, addr: u8) -> Result<u8, SpiPortError> {
// Using RCRU instruction to read using unbanked (full) address
let mut r_data = self.transfer(RCRU, addr, 0)?;
let mut r_data = self.rw_addr_u8(RCRU, addr, 0)?;
Ok(r_data)
}
pub fn read_reg_16b(&mut self, lo_addr: u8) -> Result<u16, SPI::Error> {
pub fn read_reg_16b(&mut self, lo_addr: u8) -> Result<u16, SpiPortError> {
let mut r_data_lo = self.read_reg_8b(lo_addr)?;
let mut r_data_hi = self.read_reg_8b(lo_addr + 1)?;
// Combine top and bottom 8-bit to return 16-bit
Ok(((r_data_hi as u16) << 8) | r_data_lo as u16)
}
pub fn write_reg_8b(&mut self, addr: u8, data: u8) -> Result<u8, SPI::Error> {
// TODO: addr should be separated from w_data
// Using WCRU instruction to write using unbanked (full) address
self.transfer(WCRU, addr, data)?;
Ok(0x01) // TODO: should not be just 0x01
// Currently requires manual slicing (buf[1:]) for the data read back
pub fn read_rxdat<'a>(&mut self, buf: &'a mut [u8], data_length: u32)
-> Result<u8, SpiPortError> {
let r_valid = self.r_n(buf, ERXDATA, data_length)?;
Ok(r_valid)
}
fn transfer(&mut self, opcode: u8, addr: u8, data: u8)
-> Result<u8, SPI::Error> {
// TODO: Currently assumes read/write data is only 1-byte
pub fn write_reg_8b(&mut self, addr: u8, data: u8) -> Result<(), SpiPortError> {
// TODO: addr should be separated from w_data
// Using WCRU instruction to write using unbanked (full) address
self.rw_addr_u8(WCRU, addr, data)?;
Ok(())
}
pub fn write_reg_16b(&mut self, lo_addr: u8, data: u16) -> Result<(), SpiPortError> {
self.write_reg_8b(lo_addr, (data & 0xff) as u8)?;
self.write_reg_8b(lo_addr + 1, ((data & 0xff00) >> 8) as u8)?;
Ok(())
}
// TODO: Generalise transfer functions
// TODO: (Make data read/write as reference to array)
// Currently requires 1-byte addr, read/write data is only 1-byte
fn rw_addr_u8(&mut self, opcode: u8, addr: u8, data: u8)
-> Result<u8, SpiPortError> {
// Enable chip select
self.nss.set_low();
// Start writing to SLAVE
@ -72,13 +115,45 @@ impl <SPI: Transfer<u8, Error = E>,
buf[0] = opcode;
buf[1] = addr;
buf[2] = data;
let result = self.spi.transfer(&mut buf);
match self.spi.transfer(&mut buf) {
Ok(_) => {
// Disable chip select
self.nss.set_high();
Ok(buf[2])
},
// TODO: Maybe too naive?
Err(e) => {
// Disable chip select
self.nss.set_high();
Err(SpiPortError::TransferError)
}
}
}
match result {
Ok(_) => Ok(buf[2]),
Err(e) => Err(e),
// TODO: Generalise transfer functions
// Currently does NOT accept addr, read data is N-byte long
// Returns a reference to the data returned
// Note: buf must be at least (data_length + 1)-byte long
// TODO: Check and raise error for array size < (data_length + 1)
fn r_n<'a>(&mut self, buf: &'a mut [u8], opcode: u8, data_length: u32)
-> Result<u8, SpiPortError> {
// Enable chip select
self.nss.set_low();
// Start writing to SLAVE
buf[0] = opcode;
match self.spi.transfer(buf) {
// TODO: Now returns a boolean, maybe use Option<u8> later on?
Ok(_) => {
// Disable chip select
self.nss.set_high();
Ok(1)
},
// TODO: Maybe too naive?
Err(e) => {
// Disable chip select
self.nss.set_high();
Err(SpiPortError::TransferError)
}
}
}
}