From 1fe8191663e2e737b503c20a5cfb3918ddb2c7b0 Mon Sep 17 00:00:00 2001
From: Felix Rusu <felix@lowpowerlab.com>
Date: Tue, 31 Mar 2020 11:53:58 -0400
Subject: [PATCH] SAMD21 faster SPI clk, SAMD51 IRQ_PIN

---
 RFM69.cpp | 6 ++++--
 RFM69.h   | 2 ++
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/RFM69.cpp b/RFM69.cpp
index 8466887..ac5e835 100644
--- a/RFM69.cpp
+++ b/RFM69.cpp
@@ -484,8 +484,10 @@ void RFM69::select() {
   // set RFM69 SPI settings explicitly
   SPI.setDataMode(SPI_MODE0);
   SPI.setBitOrder(MSBFIRST);
-#ifdef __arm__
-	SPI.setClockDivider(SPI_CLOCK_DIV16);
+#ifdef defined(__SAMD21__)
+	SPI.setClockDivider(SPI_CLOCK_DIV2);
+#elif defined(__SAMD51__)
+  SPI.setClockDivider(SPI_CLOCK_DIV16);
 #else
   SPI.setClockDivider(SPI_CLOCK_DIV4); // decided to slow down from DIV2 after SPI stalling in some instances, especially visible on mega1284p when RFM69 and FLASH chip both present
 #endif
diff --git a/RFM69.h b/RFM69.h
index 4f4defc..7105111 100644
--- a/RFM69.h
+++ b/RFM69.h
@@ -129,6 +129,8 @@
   #define RF69_IRQ_PIN          PA3
 #elif defined(MOTEINO_M0)
   #define RF69_IRQ_PIN          9
+#elif defined(__SAMD51__)
+  #define RF69_IRQ_PIN          18
 #elif defined(ARDUINO_SAMD_ZERO) //includes Feather SAMD
   #define RF69_IRQ_PIN          3
 #elif defined(ESP8266)