diff --git a/ArduCAM/ArduCAM.cpp b/ArduCAM/ArduCAM.cpp
index c88c33d1..6c060f4b 100644
--- a/ArduCAM/ArduCAM.cpp
+++ b/ArduCAM/ArduCAM.cpp
@@ -130,7 +130,7 @@ ArduCAM::ArduCAM(byte model ,int CS)
 			B_CS = CS;
 		}
 	#else
-		#if (defined(ESP8266)||defined(ESP32)||defined(TEENSYDUINO) ||defined(NRF52840_XXAA))
+		#if (defined(ESP8266) || defined(ESP32) || defined(TEENSYDUINO) || defined(NRF52840_XXAA) || defined(ARDUINO_ARCH_MBED))
 		  B_CS = CS;
 		#else
 		  P_CS  = portOutputRegister(digitalPinToPort(CS));
diff --git a/ArduCAM/ArduCAM.h b/ArduCAM/ArduCAM.h
index 0c6059d8..7a935137 100644
--- a/ArduCAM/ArduCAM.h
+++ b/ArduCAM/ArduCAM.h
@@ -306,6 +306,28 @@
 #define regsize uint32_t
 #endif
 
+#if defined(ARDUINO_ARCH_MBED)
+#define cbi(reg, bitmask) digitalWrite(bitmask, LOW)
+#define sbi(reg, bitmask) digitalWrite(bitmask, HIGH)
+#define pulse_high(reg, bitmask) \
+	sbi(reg, bitmask);           \
+	cbi(reg, bitmask);
+#define pulse_low(reg, bitmask) \
+	cbi(reg, bitmask);          \
+	sbi(reg, bitmask);
+
+#define cport(port, data) port &= data
+#define sport(port, data) port |= data
+
+// Avoid conflicts with what is defined in STL.
+// Not used in this library anyway
+// #define swap(type, i, j) {type t = i; i = j; j = t;}
+
+#define fontbyte(x) cfont.font[x]
+
+#define regtype volatile uint32_t
+#define regsize uint32_t
+#endif
 
 /****************************************************/
 /* Sensor related definition 												*/