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sayma: automated DAC SYSREF phase calibration

This commit is contained in:
Sebastien Bourdeauducq 2018-07-26 16:22:08 +08:00
parent dbcf2fe9b4
commit 32c95ac034
3 changed files with 138 additions and 65 deletions
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66
artiq/firmware/libboard_artiq/ad9154.rs
View File

@ -1,6 +1,5 @@
use board_misoc::{csr, clock};
use ad9154_reg;
use hmc830_7043::hmc7043;
fn spi_setup(dacno: u8) {
unsafe {
@ -688,7 +687,7 @@ fn dac_cfg_retry(dacno: u8) -> Result<(), &'static str> {
}
}
fn dac_get_sync_error(dacno: u8) -> u16 {
pub fn dac_get_sync_error(dacno: u8) -> u16 {
spi_setup(dacno);
let sync_error = ((read(ad9154_reg::SYNC_CURRERR_L) as u16) |
((read(ad9154_reg::SYNC_CURRERR_H) as u16) << 8))
@ -696,73 +695,24 @@ fn dac_get_sync_error(dacno: u8) -> u16 {
sync_error
}
fn dac_sysref_scan(dacno: u8, center_phase: u16) {
let mut margin_minus = None;
let mut margin_plus = None;
info!("AD9154-{} SYSREF scan...", dacno);
hmc7043::sysref_offset_dac(dacno, center_phase);
clock::spin_us(10000);
let mut sync_error_last = dac_get_sync_error(dacno);
for d in 0..128 {
hmc7043::sysref_offset_dac(dacno, center_phase - d);
clock::spin_us(10000);
let sync_error = dac_get_sync_error(dacno);
if sync_error != sync_error_last {
info!(" sync error-: {} -> {}", sync_error_last, sync_error);
margin_minus = Some(d);
break;
}
}
hmc7043::sysref_offset_dac(dacno, center_phase);
clock::spin_us(10000);
sync_error_last = dac_get_sync_error(dacno);
for d in 0..128 {
hmc7043::sysref_offset_dac(dacno, center_phase + d);
clock::spin_us(10000);
let sync_error = dac_get_sync_error(dacno);
if sync_error != sync_error_last {
info!(" sync error+: {} -> {}", sync_error_last, sync_error);
margin_plus = Some(d);
break;
}
}
if margin_minus.is_some() && margin_plus.is_some() {
let margin_minus = margin_minus.unwrap();
let margin_plus = margin_plus.unwrap();
info!(" margins: -{} +{}", margin_minus, margin_plus);
if margin_minus < 10 || margin_plus < 10 {
error!("SYSREF margins are too small");
}
} else {
error!("Unable to determine SYSREF margins");
}
}
fn init_dac(dacno: u8, sysref_phase: u16) -> Result<(), &'static str> {
fn init_dac(dacno: u8) -> Result<(), &'static str> {
let dacno = dacno as u8;
// Reset the DAC, detect and configure it
dac_reset(dacno);
dac_detect(dacno)?;
dac_cfg_retry(dacno)?;
// Run the PRBS, STPL and SYSREF scan tests
dac_prbs(dacno)?;
dac_stpl(dacno, 4, 2)?;
dac_sysref_scan(dacno, sysref_phase);
// Set SYSREF phase and reconfigure the DAC
hmc7043::sysref_offset_dac(dacno, sysref_phase);
dac_cfg_retry(dacno)?;
Ok(())
}
pub fn init(sysref_phase_dac: u16) {
pub fn init() {
for dacno in 0..csr::AD9154.len() {
// We assume DCLK and SYSREF traces are matched on the PCB
// (they are on Sayma) so only one phase is needed.
match init_dac(dacno as u8, sysref_phase_dac) {
match init_dac(dacno as u8) {
Ok(_) => (),
Err(e) => error!("failed to initialize AD9154-{}: {}", dacno, e)
}

129
artiq/firmware/libboard_artiq/jesd204sync.rs
View File

@ -1,8 +1,7 @@
use board_misoc::csr;
use board_misoc::config;
use board_misoc::{csr, clock, config};
use hmc830_7043::hmc7043;
use ad9154;
fn sysref_sample() -> bool {
unsafe { csr::sysref_sampler::sample_result_read() == 1 }
@ -142,3 +141,127 @@ pub fn sysref_auto_rtio_align(expected_align: u16) -> Result<(), &'static str> {
};
sysref_rtio_align(phase_offset, expected_align)
}
fn sysref_cal_dac(dacno: u8) -> Result<u16, &'static str> {
info!("calibrating SYSREF phase at DAC-{}...", dacno);
let mut d = 0;
let dmin;
let dmax;
hmc7043::sysref_offset_dac(dacno, d);
clock::spin_us(10000);
let sync_error_last = ad9154::dac_get_sync_error(dacno);
loop {
hmc7043::sysref_offset_dac(dacno, d);
clock::spin_us(10000);
let sync_error = ad9154::dac_get_sync_error(dacno);
if sync_error != sync_error_last {
dmin = d;
break;
}
d += 1;
if d > 128 {
return Err("no sync errors found when scanning delay");
}
}
d += 5; // get away from jitter
hmc7043::sysref_offset_dac(dacno, d);
clock::spin_us(10000);
let sync_error_last = ad9154::dac_get_sync_error(dacno);
loop {
hmc7043::sysref_offset_dac(dacno, d);
clock::spin_us(10000);
let sync_error = ad9154::dac_get_sync_error(dacno);
if sync_error != sync_error_last {
dmax = d;
break;
}
d += 1;
if d > 128 {
return Err("no sync errors found when scanning delay");
}
}
let phase = (dmin+dmax)/2;
info!(" ...done, min={}, max={}, result={}", dmin, dmax, phase);
Ok(phase)
}
fn sysref_dac_align(dacno: u8, phase: u16) -> Result<(), &'static str> {
let mut margin_minus = None;
let mut margin_plus = None;
info!("verifying SYSREF margins at DAC-{}...", dacno);
hmc7043::sysref_offset_dac(dacno, phase);
clock::spin_us(10000);
let sync_error_last = ad9154::dac_get_sync_error(dacno);
for d in 0..128 {
hmc7043::sysref_offset_dac(dacno, phase - d);
clock::spin_us(10000);
let sync_error = ad9154::dac_get_sync_error(dacno);
if sync_error != sync_error_last {
info!(" sync error-: {} -> {}", sync_error_last, sync_error);
margin_minus = Some(d);
break;
}
}
hmc7043::sysref_offset_dac(dacno, phase);
clock::spin_us(10000);
let sync_error_last = ad9154::dac_get_sync_error(dacno);
for d in 0..128 {
hmc7043::sysref_offset_dac(dacno, phase + d);
clock::spin_us(10000);
let sync_error = ad9154::dac_get_sync_error(dacno);
if sync_error != sync_error_last {
info!(" sync error+: {} -> {}", sync_error_last, sync_error);
margin_plus = Some(d);
break;
}
}
if margin_minus.is_some() && margin_plus.is_some() {
let margin_minus = margin_minus.unwrap();
let margin_plus = margin_plus.unwrap();
info!(" margins: -{} +{}", margin_minus, margin_plus);
if margin_minus < 10 || margin_plus < 10 {
return Err("SYSREF margins at DAC are too small, board needs recalibration");
}
} else {
return Err("Unable to determine SYSREF margins at DAC");
}
// Leave SYSREF at the correct setting
hmc7043::sysref_offset_dac(dacno, phase);
Ok(())
}
pub fn sysref_auto_dac_align() -> Result<(), &'static str> {
// We assume that DAC SYSREF traces are length-matched so only one phase
// value is needed, and we use DAC-0 as calibration reference.
let entry = config::read_str("sysref_phase_dac", |r| r.map(|s| s.parse()));
let phase = match entry {
Ok(Ok(phase)) => phase,
_ => {
let phase = sysref_cal_dac(0)?;
if let Err(e) = config::write_int("sysref_phase_dac", phase as u32) {
error!("failed to update DAC SYSREF phase in config: {}", e);
}
phase
}
};
for dacno in 0..csr::AD9154.len() {
sysref_dac_align(dacno as u8, phase)?;
}
Ok(())
}

8
artiq/firmware/runtime/main.rs
View File

@ -56,9 +56,6 @@ mod moninj;
#[cfg(has_rtio_analyzer)]
mod analyzer;
#[cfg(has_ad9154)]
const SYSREF_PHASE_DAC: u16 = 94;
fn startup() {
irq::set_mask(0);
irq::set_ie(true);
@ -114,10 +111,13 @@ fn startup() {
#[cfg(has_ad9154)]
{
board_artiq::ad9154::jesd_unreset();
board_artiq::ad9154::init();
if let Err(e) = board_artiq::jesd204sync::sysref_auto_rtio_align(1) {
error!("failed to align SYSREF at FPGA: {}", e);
}
board_artiq::ad9154::init(SYSREF_PHASE_DAC);
if let Err(e) = board_artiq::jesd204sync::sysref_auto_dac_align() {
error!("failed to align SYSREF at DAC: {}", e);
}
}
#[cfg(has_allaki_atts)]
board_artiq::hmc542::program_all(8/*=4dB*/);