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ENC424J600
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rx,tx: Simplify access to buffer struct fields

This commit is contained in:
Harry Ho 2021-06-04 10:27:24 +08:00
parent 24adbd3a57
commit 1dbe5861f0
3 changed files with 16 additions and 58 deletions
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20
src/lib.rs
View File

@ -106,9 +106,9 @@ impl <SPI: Transfer<u8>,
pub fn init_rxbuf(&mut self) -> Result<(), Error> {
// Set ERXST pointer
self.spi_port.write_reg_16b(spi::addrs::ERXST, self.rx_buf.get_start_addr())?;
self.spi_port.write_reg_16b(spi::addrs::ERXST, self.rx_buf.start_addr)?;
// Set ERXTAIL pointer
self.spi_port.write_reg_16b(spi::addrs::ERXTAIL, self.rx_buf.get_tail_addr())?;
self.spi_port.write_reg_16b(spi::addrs::ERXTAIL, self.rx_buf.tail_addr)?;
// Set MAMXFL to maximum number of bytes in each accepted packet
self.spi_port.write_reg_16b(spi::addrs::MAMXFL, RAW_FRAME_LENGTH_MAX as u16)?;
// Enable RX - set RXEN (ECON1<0>) to 1
@ -169,11 +169,11 @@ impl <SPI: Transfer<u8>,
}
}
// Set ERXRDPT pointer to next_addr
self.spi_port.write_reg_16b(spi::addrs::ERXRDPT, self.rx_buf.get_next_addr())?;
self.spi_port.write_reg_16b(spi::addrs::ERXRDPT, self.rx_buf.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));
self.rx_buf.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)?;
@ -190,8 +190,8 @@ impl <SPI: Transfer<u8>,
// Set ERXTAIL pointer to (next_addr - 2)
// * Assume head, tail, next and wrap addresses are word-aligned (even)
// - If next_addr is at least (start_addr+2), then set tail pointer to the word right before next_addr
if self.rx_buf.get_next_addr() > self.rx_buf.get_start_addr() {
self.spi_port.write_reg_16b(spi::addrs::ERXTAIL, self.rx_buf.get_next_addr() - 2)?;
if self.rx_buf.next_addr > self.rx_buf.start_addr {
self.spi_port.write_reg_16b(spi::addrs::ERXTAIL, self.rx_buf.next_addr - 2)?;
// - Otherwise, next_addr will wrap, so set tail pointer to the last word address of RX buffer
} else {
self.spi_port.write_reg_16b(spi::addrs::ERXTAIL, rx::RX_MAX_ADDRESS - 1)?;
@ -205,14 +205,14 @@ impl <SPI: Transfer<u8>,
/// Send an established packet
fn send_packet(&mut self, packet: &tx::TxPacket) -> Result<(), Error> {
// Set EGPWRPT pointer to next_addr
self.spi_port.write_reg_16b(spi::addrs::EGPWRPT, self.tx_buf.get_next_addr())?;
self.spi_port.write_reg_16b(spi::addrs::EGPWRPT, self.tx_buf.next_addr)?;
// Copy packet data to SRAM Buffer
// 1-byte Opcode is included
let mut txdat_buf: [u8; RAW_FRAME_LENGTH_MAX + 1] = [0; RAW_FRAME_LENGTH_MAX + 1];
packet.write_frame_to(&mut txdat_buf[1..]);
self.spi_port.write_txdat(&mut txdat_buf, packet.get_frame_length())?;
// Set ETXST to packet start address
self.spi_port.write_reg_16b(spi::addrs::ETXST, self.tx_buf.get_next_addr())?;
self.spi_port.write_reg_16b(spi::addrs::ETXST, self.tx_buf.next_addr)?;
// Set ETXLEN to packet length
self.spi_port.write_reg_16b(spi::addrs::ETXLEN, packet.get_frame_length() as u16)?;
// Send packet - set TXRTS (ECON1<1>) to start transmission
@ -226,8 +226,8 @@ impl <SPI: Transfer<u8>,
// (See: Register 9-2, ENC424J600 Data Sheet)
// Update TX buffer start address
// * Assume TX buffer consumes the entire general-purpose SRAM block
self.tx_buf.set_next_addr((self.tx_buf.get_next_addr() + packet.get_frame_length() as u16) %
self.rx_buf.get_start_addr() - self.tx_buf.get_start_addr());
self.tx_buf.next_addr = (self.tx_buf.next_addr + packet.get_frame_length() as u16) %
self.rx_buf.start_addr - self.tx_buf.start_addr;
Ok(())
}
}

27
src/rx.rs
View File

@ -11,9 +11,9 @@ pub const RSV_LENGTH: usize = 6;
/// Struct for RX Buffer on the hardware
/// TODO: Should be a singleton
pub struct RxBuffer {
start_addr: u16,
next_addr: u16,
tail_addr: u16
pub start_addr: u16,
pub next_addr: u16,
pub tail_addr: u16
}
impl RxBuffer {
@ -24,27 +24,6 @@ impl RxBuffer {
tail_addr: ERXTAIL_DEFAULT
}
}
pub fn set_start_addr(&mut self, addr: u16) {
self.start_addr = addr;
}
pub fn get_start_addr(& self) -> u16{
self.start_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

27
src/tx.rs
View File

@ -3,10 +3,10 @@ use crate::RAW_FRAME_LENGTH_MAX;
/// Struct for TX Buffer on the hardware
/// TODO: Should be a singleton
pub struct TxBuffer {
start_addr: u16,
pub start_addr: u16,
// The following two fields are controlled by firmware
next_addr: u16,
tail_addr: u16
pub next_addr: u16,
pub tail_addr: u16
}
impl TxBuffer {
@ -17,27 +17,6 @@ impl TxBuffer {
tail_addr: 0x0000
}
}
pub fn set_start_addr(&mut self, addr: u16) {
self.start_addr = addr;
}
pub fn get_start_addr(& self) -> u16{
self.start_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 TX Packet