From 3bca57a69d7bd9cd645735388dac3c85130536d0 Mon Sep 17 00:00:00 2001
From: Jan-Willem Gmelig Meyling <jan-willem@youngmediaexperts.nl>
Date: Thu, 2 May 2019 20:29:17 +0200
Subject: [PATCH] Support Arduino SAMD21

---
 src/sps30.cpp | 13 ++++++++++++-
 src/sps30.h   |  7 +++++++
 2 files changed, 19 insertions(+), 1 deletion(-)

diff --git a/src/sps30.cpp b/src/sps30.cpp
index 57644eb..951145e 100644
--- a/src/sps30.cpp
+++ b/src/sps30.cpp
@@ -543,6 +543,8 @@ uint8_t SPS30::GetValues(struct sps_values *v)
 
     // I2C will only provide valid data bytes depending on I2C buffer
     // if I2C buffer is less than 64 it only providing MASS info (set in constructor)
+
+#if defined INCLUDE_I2C
     if (I2C_Max_bytes > 20) {
         v->NumPM0 = byte_to_float(offset + 16);
         v->NumPM1 = byte_to_float(offset + 20);
@@ -551,6 +553,8 @@ uint8_t SPS30::GetValues(struct sps_values *v)
         v->NumPM10 = byte_to_float(offset + 32);
         v->PartSize = byte_to_float(offset + 36);
     }
+#endif
+
     return(ERR_OK);
 }
 
@@ -615,12 +619,16 @@ bool SPS30::setSerialSpeed()
             _serial = &Serial;
             break;
 
-#if defined(__AVR_ATmega1280__) || defined(__AVR_ATmega2560__)
+#if defined(__AVR_ATmega1280__) || defined(__AVR_ATmega2560__) || defined(_SAMD21_)
         case SERIALPORT1:
             Serial1.begin(_Serial_baud);
             _serial = &Serial1;
             break;
 
+#endif
+
+#if defined(__AVR_ATmega1280__) || defined(__AVR_ATmega2560__)
+
         case SERIALPORT2:
             Serial2.begin(_Serial_baud);
             _serial = &Serial2;
@@ -655,12 +663,15 @@ bool SPS30::setSerialSpeed()
                 if (_SPS30_Debug) printf("TX/RX line not defined\n");
                 return false;
             }
+
+#if defined(__AVR_ATmega1280__) || defined(__AVR_ATmega2560__) || defined(_SAMD21_)
             // In case RX and TX are both pin 8, try Serial1 anyway.
             // A way to force-enable Serial1 on some boards.
             if (Serial_RX == 8 && Serial_TX == 8) {
                 Serial1.begin(_Serial_baud);
                 _serial = &Serial1;
             }
+#endif
 
             else // try softserial
             {
diff --git a/src/sps30.h b/src/sps30.h
index 9ec0bce..14101d7 100755
--- a/src/sps30.h
+++ b/src/sps30.h
@@ -89,6 +89,13 @@
 
 #endif // AVR definition check
 
+/*
+ * Arduino SAMD does not include software serial
+*/
+#if defined(_SAMD21_)
+	#undef INCLUDE_SOFTWARE_SERIAL
+#endif
+
 #if defined INCLUDE_I2C
 
     #if defined SOFTI2C_ESP32       // in case of SCD30