From c66f9483f8b243bf21896e7f2094d42b946afbdf Mon Sep 17 00:00:00 2001
From: Sebastien Bourdeauducq <sb@m-labs.hk>
Date: Thu, 12 Jul 2018 12:33:50 +0800
Subject: [PATCH] hmc7043: wait after changing delays

Allows for the SPI transaction to finish, and for the delay to stabilize.
---
 artiq/firmware/libboard_artiq/hmc830_7043.rs | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/artiq/firmware/libboard_artiq/hmc830_7043.rs b/artiq/firmware/libboard_artiq/hmc830_7043.rs
index 6866b92a6..0eb7f3ad1 100644
--- a/artiq/firmware/libboard_artiq/hmc830_7043.rs
+++ b/artiq/firmware/libboard_artiq/hmc830_7043.rs
@@ -386,6 +386,7 @@ pub mod hmc7043 {
         } else {
             unimplemented!();
         }
+        clock::spin_us(100);
     }
 
     fn sysref_offset_fpga(phase_offset: u16) {
@@ -394,12 +395,14 @@ pub mod hmc7043 {
         spi_setup();
         write(0x0111, analog_delay);
         write(0x0112, digital_delay);
+        clock::spin_us(100);
     }
 
     fn sysref_slip() {
         spi_setup();
         write(0x0002, 0x02);
         write(0x0002, 0x00);
+        clock::spin_us(100);
     }
 
     fn sysref_sample() -> bool {