From aa21f4fe1f0fc96410cf9277f4071e28ffc4d756 Mon Sep 17 00:00:00 2001
From: Martino Facchin <m.facchin@arduino.cc>
Date: Wed, 7 Apr 2021 17:12:33 +0200
Subject: [PATCH] SPI: restore 12MHz as maximum frequency

Fixes https://github.com/arduino/ArduinoCore-samd/issues/593
---
 libraries/SPI/SPI.cpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/libraries/SPI/SPI.cpp b/libraries/SPI/SPI.cpp
index f355e2378..111ce13b3 100644
--- a/libraries/SPI/SPI.cpp
+++ b/libraries/SPI/SPI.cpp
@@ -94,8 +94,8 @@ void SPIClass::config(SPISettings settings)
     _p_sercom->disableSPI();
 
     uint32_t clock_freq = settings.getClockFreq();
-    if (clock_freq > F_CPU/2) {
-      clock_freq = F_CPU/2;
+    if (clock_freq > SERCOM_FREQ_REF/SPI_MIN_CLOCK_DIVIDER) {
+      clock_freq = SERCOM_FREQ_REF/SPI_MIN_CLOCK_DIVIDER;
     }
 
     _p_sercom->initSPI(_padTx, _padRx, SPI_CHAR_SIZE_8_BITS, getBitOrder(settings));