From 28cc900343f88dd562a57024d9bba4601d2113df Mon Sep 17 00:00:00 2001
From: Robin Giese <robin@grumpycorp.com>
Date: Sun, 23 Aug 2020 21:18:19 -0700
Subject: [PATCH] Help library compile for Spark/Particle

---
 Adafruit_SPIDevice.cpp | 11 ++++++++++-
 Adafruit_SPIDevice.h   |  2 +-
 2 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/Adafruit_SPIDevice.cpp b/Adafruit_SPIDevice.cpp
index 50eece8..353f286 100644
--- a/Adafruit_SPIDevice.cpp
+++ b/Adafruit_SPIDevice.cpp
@@ -112,7 +112,16 @@ bool Adafruit_SPIDevice::begin(void) {
 void Adafruit_SPIDevice::transfer(uint8_t *buffer, size_t len) {
   if (_spi) {
     // hardware SPI is easy
-    _spi->transfer(buffer, len);
+    #ifdef SPARK
+      // Spark uses asynchronous DMA for multi-byte transfers; 
+      // just use the single-byte method for sync transfers.
+      for (size_t i = 0; i < len; i++) {
+        _spi->transfer(buffer[i]);
+      }
+    #else
+      _spi->transfer(buffer, len);
+    #endif
+
     return;
   }
 
diff --git a/Adafruit_SPIDevice.h b/Adafruit_SPIDevice.h
index f1ef0cc..764f316 100644
--- a/Adafruit_SPIDevice.h
+++ b/Adafruit_SPIDevice.h
@@ -5,7 +5,7 @@
 
 // some modern SPI definitions don't have BitOrder enum
 #if (defined(__AVR__) && !defined(ARDUINO_ARCH_MEGAAVR)) ||                    \
-    defined(ESP8266) || defined(TEENSYDUINO) ||                                \
+    defined(ESP8266) || defined(TEENSYDUINO) || defined(SPARK) ||              \
     defined(ARDUINO_ARCH_SPRESENSE) || defined(ARDUINO_attinyxy7) ||           \
     defined(ARDUINO_attinyxy6) || defined(ARDUINO_attinyxy4) ||                \
     defined(ARDUINO_attinyxy2) || defined(ARDUINO_AVR_ATmega4809) ||           \