From 51e28de2f61a978481d27824073567142ae657d2 Mon Sep 17 00:00:00 2001
From: Harry Ho <hh@m-labs.hk>
Date: Thu, 16 Sep 2021 15:37:46 +0800
Subject: [PATCH] ad9154: check alignment phase error after one-shot sync

---
 artiq/firmware/libboard_artiq/ad9154.rs | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/artiq/firmware/libboard_artiq/ad9154.rs b/artiq/firmware/libboard_artiq/ad9154.rs
index d6d3b2c02..493f1593a 100644
--- a/artiq/firmware/libboard_artiq/ad9154.rs
+++ b/artiq/firmware/libboard_artiq/ad9154.rs
@@ -545,5 +545,10 @@ pub fn sync(dacno: u8) -> Result<bool, &'static str> {
         return Err("no sysref edge");
     }
     let realign_occured = sync_status & ad9154_reg::SYNC_ROTATE != 0;
+    let phase_error = sync_status & ad9154_reg::SYNC_WLIM != 0;
+    if !realign_occured && phase_error {
+        // see also: SYNC_ERRWINDOW
+        warn!("  phase error window exceeded but clock did not rotate");
+    }
     Ok(realign_occured)
 }