From ec2aaecb480cd288a15ba7efb122f74c3ebd46fb Mon Sep 17 00:00:00 2001
From: Ryan Summers <ryan.summers@vertigo-designs.com>
Date: Thu, 17 Dec 2020 14:11:28 +0100
Subject: [PATCH] Adding safety documentation

---
 src/dac.rs | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/dac.rs b/src/dac.rs
index ef65d19..f21ccfd 100644
--- a/src/dac.rs
+++ b/src/dac.rs
@@ -138,6 +138,8 @@ macro_rules! dac_output {
 
                 // AXISRAM is uninitialized. As such, we manually zero-initialize it here before
                 // starting the transfer.
+                // Note(unsafe): We currently own all DAC_BUF[index] buffers and are not using them
+                // elsewhere, so it is safe to access them here.
                 for buf in unsafe { DAC_BUF[$index].iter_mut() } {
                     for byte in buf.iter_mut() {
                         *byte = 0;