From 552749accac737283ec798dc8d49e0e28a8702cf Mon Sep 17 00:00:00 2001
From: Stephane Dallongeville <stephane.dallongeville@pasteur.fr>
Date: Wed, 29 May 2024 23:51:02 +0200
Subject: [PATCH] Better to avoid transfer when len = 0

---
 src/dma.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/dma.c b/src/dma.c
index da19eb74..37e8916d 100644
--- a/src/dma.c
+++ b/src/dma.c
@@ -321,6 +321,9 @@ u16 DMA_getQueueTransferSize()
 
 bool DMA_transfer(TransferMethod tm, u8 location, void* from, u16 to, u16 len, u16 step)
 {
+    // nothing to do (avoid transfering 65536 words when len = 0)
+    if (!len) return TRUE;
+
     switch(tm)
     {
         // default = CPU transfer