update

example/receive_interrupt/receive_interrupt.ino

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+// demo: CAN-BUS Shield, receive data with interrupt mode
+// when in interrupt mode, the data coming can't be too fast, must >20ms, or else you can use check mode
+// loovee, 2013-11-27
+
+#include <SPI.h>
+#include "mcp_can.h"
+
+unsigned char Flag_Recv = 0;
+unsigned char len = 0;
+unsigned char buf[8];
+char str[20];
+
+void setup()
+{
+    Serial.begin(115200);
+
+START_INIT:
+
+    if(CAN_OK == CAN.begin(CAN_500KBPS))                   // init can bus : baudrate = 500k
+    {
+        Serial.println("CAN BUS Shield init ok!");
+    }
+    else
+    {
+        Serial.println("CAN BUS Shield init fail");
+        Serial.println("Init CAN BUS Shield again");
+        delay(100);
+        goto START_INIT;
+    }
+    
+    attachInterrupt(0, MCP2515_ISR, FALLING); // start interrupt
+}
+
+void MCP2515_ISR()
+{
+     Flag_Recv = 1;
+}
+
+void loop()
+{
+    if(Flag_Recv)                   // check if get data
+    {
+    
+        Flag_Recv = 0;                // clear flag
+        CAN.readMsgBuf(&len, buf);    // read data,  len: data length, buf: data buf
+
+        for(int i = 0; i<len; i++)    // print the data
+        {
+            Serial.print(buf[i]);Serial.print("\t");
+        }
+        Serial.println();
+    }
+}
+
+/*********************************************************************************************************
+  END FILE
+*********************************************************************************************************/