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siphaser: cleanup

This commit is contained in:
Sebastien Bourdeauducq 2018-03-07 11:15:44 +08:00
parent 74d1df3ff0
commit 916197c4d7
5 changed files with 83 additions and 82 deletions
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145
artiq/firmware/libboard_artiq/si5324.rs
View File

@ -1,6 +1,6 @@
use core::result;
use board::clock;
#[cfg(any(not(si5324_soft_reset), has_si_phaser))]
#[cfg(not(si5324_soft_reset))]
use board::csr;
use i2c;
@ -266,90 +266,91 @@ pub fn select_input(input: Input) -> Result<()> {
Ok(())
}
#[cfg(has_si_phaser)]
pub fn select_recovered_clock(rc: bool) -> Result<()> {
write(3, (read(3)? & 0xdf) | (1 << 5))?; // DHOLD=1
unsafe {
csr::si_phaser::switch_clocks_write(if rc { 1 } else { 0 });
}
write(3, (read(3)? & 0xdf) | (0 << 5))?; // DHOLD=0
monitor_lock()?;
Ok(())
}
#[cfg(has_siphaser)]
pub mod siphaser {
use super::*;
use board::csr;
use board::clock;
#[cfg(has_si_phaser)]
fn phase_shift(direction: u8) {
unsafe {
csr::si_phaser::phase_shift_write(direction);
while csr::si_phaser::phase_shift_done_read() == 0 {}
}
// wait for the Si5324 loop to stabilize
clock::spin_us(500);
}
#[cfg(has_si_phaser)]
fn get_phaser_sample() -> bool {
let mut sample = true;
for _ in 0..32 {
if unsafe { csr::si_phaser::sample_result_read() } == 0 {
sample = false;
pub fn select_recovered_clock(rc: bool) -> Result<()> {
write(3, (read(3)? & 0xdf) | (1 << 5))?; // DHOLD=1
unsafe {
csr::siphaser::switch_clocks_write(if rc { 1 } else { 0 });
}
write(3, (read(3)? & 0xdf) | (0 << 5))?; // DHOLD=0
monitor_lock()?;
Ok(())
}
sample
}
#[cfg(has_si_phaser)]
const PS_MARGIN: u32 = 28;
fn phase_shift(direction: u8) {
unsafe {
csr::siphaser::phase_shift_write(direction);
while csr::siphaser::phase_shift_done_read() == 0 {}
}
// wait for the Si5324 loop to stabilize
clock::spin_us(500);
}
#[cfg(has_si_phaser)]
fn get_stable_phaser_sample() -> (bool, u32) {
let mut nshifts: u32 = 0;
loop {
let s1 = get_phaser_sample();
for _ in 0..PS_MARGIN {
phase_shift(1);
}
let s2 = get_phaser_sample();
for _ in 0..PS_MARGIN {
phase_shift(1);
}
let s3 = get_phaser_sample();
nshifts += 2*PS_MARGIN;
if s1 == s2 && s2 == s3 {
for _ in 0..PS_MARGIN {
phase_shift(0);
fn get_phaser_sample() -> bool {
let mut sample = true;
for _ in 0..32 {
if unsafe { csr::siphaser::sample_result_read() } == 0 {
sample = false;
}
}
sample
}
const PS_MARGIN: u32 = 28;
fn get_stable_phaser_sample() -> (bool, u32) {
let mut nshifts: u32 = 0;
loop {
let s1 = get_phaser_sample();
for _ in 0..PS_MARGIN {
phase_shift(1);
}
let s2 = get_phaser_sample();
for _ in 0..PS_MARGIN {
phase_shift(1);
}
let s3 = get_phaser_sample();
nshifts += 2*PS_MARGIN;
if s1 == s2 && s2 == s3 {
for _ in 0..PS_MARGIN {
phase_shift(0);
}
nshifts -= PS_MARGIN;
return (s2, nshifts);
}
nshifts -= PS_MARGIN;
return (s2, nshifts);
}
}
}
#[cfg(has_si_phaser)]
pub fn calibrate_skew(skew: u16) -> Result<()> {
// Get into a 0 region
let (s1, mut nshifts) = get_stable_phaser_sample();
if s1 {
while get_phaser_sample() {
pub fn calibrate_skew(skew: u16) -> Result<()> {
// Get into a 0 region
let (s1, mut nshifts) = get_stable_phaser_sample();
if s1 {
while get_phaser_sample() {
phase_shift(1);
nshifts += 1;
}
for _ in 0..PS_MARGIN {
phase_shift(1);
}
nshifts += PS_MARGIN;
}
// Get to the 0->1 transition
while !get_phaser_sample() {
phase_shift(1);
nshifts += 1;
}
for _ in 0..PS_MARGIN {
info!("nshifts to 0->1 siphaser transition: {} ({}deg)", nshifts, nshifts*360/(56*8));
// Apply specified skew referenced to that transition
for _ in 0..skew {
phase_shift(1);
}
nshifts += PS_MARGIN;
Ok(())
}
// Get to the 0->1 transition
while !get_phaser_sample() {
phase_shift(1);
nshifts += 1;
}
info!("nshifts to 0->1 siphaser transition: {} ({}deg)", nshifts, nshifts*360/(56*8));
// Apply specified skew referenced to that transition
for _ in 0..skew {
phase_shift(1);
}
Ok(())
}

6
artiq/firmware/satman/main.rs
View File

@ -235,8 +235,8 @@ fn startup() {
process_errors();
}
info!("link is up, switching to recovered clock");
si5324::select_recovered_clock(true).expect("failed to switch clocks");
si5324::calibrate_skew(32).expect("failed to calibrate skew");
si5324::siphaser::select_recovered_clock(true).expect("failed to switch clocks");
si5324::siphaser::calibrate_skew(32).expect("failed to calibrate skew");
drtio_reset(false);
drtio_reset_phy(false);
while drtio_link_rx_up() {
@ -246,7 +246,7 @@ fn startup() {
drtio_reset_phy(true);
drtio_reset(true);
info!("link is down, switching to local crystal clock");
si5324::select_recovered_clock(false).expect("failed to switch clocks");
si5324::siphaser::select_recovered_clock(false).expect("failed to switch clocks");
}
}

0
artiq/gateware/drtio/si_phaser.py → artiq/gateware/drtio/siphaser.py
View File

6
artiq/gateware/targets/kasli.py
View File

@ -21,7 +21,7 @@ from artiq.gateware.amp import AMPSoC
from artiq.gateware import rtio
from artiq.gateware.rtio.phy import ttl_simple, ttl_serdes_7series, spi2
from artiq.gateware.drtio.transceiver import gtp_7series
from artiq.gateware.drtio.si_phaser import SiPhaser7Series
from artiq.gateware.drtio.siphaser import SiPhaser7Series
from artiq.gateware.drtio.rx_synchronizer import XilinxRXSynchronizer
from artiq.gateware.drtio import DRTIOMaster, DRTIOSatellite
from artiq.build_soc import build_artiq_soc
@ -574,11 +574,11 @@ class Satellite(BaseSoC):
self.add_memory_group("drtio_aux", ["drtio0_aux"])
self.config["RTIO_FREQUENCY"] = str(rtio_clk_freq/1e6)
self.submodules.si_phaser = SiPhaser7Series(
self.submodules.siphaser = SiPhaser7Series(
si5324_clkin=platform.request("si5324_clkin"),
si5324_clkout_fabric=platform.request("si5324_clkout_fabric")
)
self.csr_devices.append("si_phaser")
self.csr_devices.append("siphaser")
i2c = self.platform.request("i2c")
self.submodules.i2c = gpio.GPIOTristate([i2c.scl, i2c.sda])
self.csr_devices.append("i2c")

8
artiq/gateware/targets/sayma_amc.py
View File

@ -33,7 +33,7 @@ from artiq.gateware import remote_csr
from artiq.gateware import rtio
from artiq.gateware.rtio.phy import ttl_simple, sawg
from artiq.gateware.drtio.transceiver import gth_ultrascale
from artiq.gateware.drtio.si_phaser import SiPhaser7Series
from artiq.gateware.drtio.siphaser import SiPhaser7Series
from artiq.gateware.drtio.rx_synchronizer import XilinxRXSynchronizer
from artiq.gateware.drtio import DRTIOMaster, DRTIOSatellite
from artiq.build_soc import build_artiq_soc
@ -433,13 +433,13 @@ class Satellite(BaseSoC):
self.add_memory_group("drtio_aux", ["drtio0_aux"])
self.config["RTIO_FREQUENCY"] = str(rtio_clk_freq/1e6)
self.submodules.si_phaser = SiPhaser7Series(
self.submodules.siphaser = SiPhaser7Series(
si5324_clkin=platform.request("si5324_clkin"),
si5324_clkout_fabric=platform.request("si5324_clkout_fabric")
)
platform.add_platform_command("set_property CLOCK_DEDICATED_ROUTE FALSE [get_nets {mmcm_ps}]",
mmcm_ps=self.si_phaser.mmcm_ps_output)
self.csr_devices.append("si_phaser")
mmcm_ps=self.siphaser.mmcm_ps_output)
self.csr_devices.append("siphaser")
self.submodules.si5324_rst_n = gpio.GPIOOut(platform.request("si5324").rst_n)
self.csr_devices.append("si5324_rst_n")
i2c = self.platform.request("i2c")