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drtio: reading still needs work buffer after all

exception
mwojcik 1 year ago committed by Gitea
parent
commit
ada3f2e704
  1. 2
      src/gateware/zc706.py
  2. 19
      src/libboard_artiq/src/drtioaux.rs
  3. 12
      src/libboard_artiq/src/drtioaux_async.rs

2
src/gateware/zc706.py

@ -399,7 +399,7 @@ class _SatelliteBase(SoCCore):
self.submodules.siphaser = SiPhaser7Series(
si5324_clkin=platform.request("si5324_clkin"),
rx_synchronizer=self.rx_synchronizer,
ultrascale=False,
ultrascale=True,
rtio_clk_freq=self.drtio_transceiver.rtio_clk_freq)
platform.add_false_path_constraints(
self.ps7.cd_sys.clk, self.siphaser.mmcm_freerun_output)

19
src/libboard_artiq/src/drtioaux.rs

@ -1,7 +1,6 @@
use crc;
use core_io::{ErrorKind as IoErrorKind, Error as IoError};
use core::slice;
use io::{proto::ProtoRead, proto::ProtoWrite, Cursor};
use libboard_zynq::{timer::GlobalTimer, time::Milliseconds};
use crate::mem::mem::DRTIOAUX_MEM;
@ -58,13 +57,14 @@ pub fn has_rx_error(linkno: u8) -> bool {
}
}
pub fn copy_work_buffer(src: *mut u32, dst: *mut u32, len: isize) {
pub fn copy_work_buffer(src: *mut u16, dst: *mut u16, len: isize) {
// AXI writes must be 4-byte aligned (drtio proto doesn't care for that),
// and AXI burst writes are not implemented yet in gateware
// and AXI burst reads/writes are not implemented yet in gateware
// thus the need for a work buffer for transmitting and copying it over
unsafe {
for i in 0..(len/4) {
for i in (0..(len/2)).step_by(2) {
*dst.offset(i) = *src.offset(i);
*dst.offset(i+1) = *src.offset(i+1);
}
}
}
@ -75,9 +75,12 @@ fn receive<F, T>(linkno: u8, f: F) -> Result<Option<T>, Error>
let linkidx = linkno as usize;
unsafe {
if (DRTIOAUX[linkidx].aux_rx_present_read)() == 1 {
let ptr = (DRTIOAUX_MEM[linkidx].base + DRTIOAUX_MEM[linkidx].size / 2) as *mut u8;
let ptr = (DRTIOAUX_MEM[linkidx].base + DRTIOAUX_MEM[linkidx].size / 2) as *mut u16;
let len = (DRTIOAUX[linkidx].aux_rx_length_read)() as usize;
let result = f(slice::from_raw_parts(ptr as *mut u8, len as usize));
// work buffer to accomodate axi burst reads
let mut buf: [u8; 1024] = [0; 1024];
copy_work_buffer(ptr, buf.as_mut_ptr() as *mut u16, len as isize);
let result = f(&buf[0..len]);
(DRTIOAUX[linkidx].aux_rx_present_write)(1);
Ok(Some(result?))
} else {
@ -130,12 +133,12 @@ fn transmit<F>(linkno: u8, f: F) -> Result<(), Error>
let linkno = linkno as usize;
unsafe {
while (DRTIOAUX[linkno].aux_tx_read)() != 0 {}
let ptr = DRTIOAUX_MEM[linkno].base as *mut u32;
let ptr = DRTIOAUX_MEM[linkno].base as *mut u16;
let len = DRTIOAUX_MEM[linkno].size / 2;
// work buffer, works with unaligned mem access
let mut buf: [u8; 1024] = [0; 1024];
let len = f(&mut buf[0..len])?;
copy_work_buffer(buf.as_mut_ptr() as *mut u32, ptr, len as isize);
copy_work_buffer(buf.as_mut_ptr() as *mut u16, ptr, len as isize);
(DRTIOAUX[linkno].aux_tx_length_write)(len as u16);
(DRTIOAUX[linkno].aux_tx_write)(1);
Ok(())

12
src/libboard_artiq/src/drtioaux_async.rs

@ -1,7 +1,6 @@
use crc;
use core_io::{ErrorKind as IoErrorKind, Error as IoError};
use core::slice;
use void::Void;
use nb;
@ -43,9 +42,12 @@ async fn receive<F, T>(linkno: u8, f: F) -> Result<Option<T>, Error>
let linkidx = linkno as usize;
unsafe {
if (DRTIOAUX[linkidx].aux_rx_present_read)() == 1 {
let ptr = (DRTIOAUX_MEM[linkidx].base + DRTIOAUX_MEM[linkidx].size / 2) as *mut u8;
let ptr = (DRTIOAUX_MEM[linkidx].base + DRTIOAUX_MEM[linkidx].size / 2) as *mut u16;
let len = (DRTIOAUX[linkidx].aux_rx_length_read)() as usize;
let result = f(slice::from_raw_parts(ptr as *mut u8, len as usize));
// work buffer to accomodate axi burst reads
let mut buf: [u8; 1024] = [0; 1024];
copy_work_buffer(ptr, buf.as_mut_ptr() as *mut u16, len as isize);
let result = f(&buf[0..len]);
(DRTIOAUX[linkidx].aux_rx_present_write)(1);
Ok(Some(result?))
} else {
@ -104,12 +106,12 @@ async fn transmit<F>(linkno: u8, f: F) -> Result<(), Error>
let linkno = linkno as usize;
unsafe {
let _ = block_async!(tx_ready(linkno)).await;
let ptr = DRTIOAUX_MEM[linkno].base as *mut u32;
let ptr = DRTIOAUX_MEM[linkno].base as *mut u16;
let len = DRTIOAUX_MEM[linkno].size / 2;
// work buffer, works with unaligned mem access
let mut buf: [u8; 1024] = [0; 1024];
let len = f(&mut buf[0..len])?;
copy_work_buffer(buf.as_mut_ptr() as *mut u32, ptr, len as isize);
copy_work_buffer(buf.as_mut_ptr() as *mut u16, ptr, len as isize);
(DRTIOAUX[linkno].aux_tx_length_write)(len as u16);
(DRTIOAUX[linkno].aux_tx_write)(1);
Ok(())

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