From c3cd83ba12679aeaa68af34cd92a5581774e2535 Mon Sep 17 00:00:00 2001
From: Max Prokhorov <prokhorov.max@outlook.com>
Date: Thu, 14 Jul 2022 14:55:10 +0300
Subject: [PATCH] SPI: writePattern() should not call setDataBits(0)

resolves #8635
---
 libraries/SPI/SPI.cpp | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/libraries/SPI/SPI.cpp b/libraries/SPI/SPI.cpp
index 93bb02748..2650998b6 100644
--- a/libraries/SPI/SPI.cpp
+++ b/libraries/SPI/SPI.cpp
@@ -515,9 +515,11 @@ void SPIClass::writePattern(const uint8_t * data, uint8_t size, uint32_t repeat)
         }
     }
     //End orig
-    setDataBits(repeatRem * 8);
-    SPI1CMD |= SPIBUSY;
-    while(SPI1CMD & SPIBUSY) {}
+    if (repeatRem) {
+        setDataBits(repeatRem * 8);
+        SPI1CMD |= SPIBUSY;
+        while(SPI1CMD & SPIBUSY) {}
+    }
 
     SPI1U = SPIUMOSI | SPIUDUPLEX | SPIUSSE;
 }