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Added possibility to use alternative TX/RX pins
Updated the Readme

FlexCAN.cpp

@@ -22,7 +22,7 @@ static const int rxb = 0;
 #define FLEXCANb_IDFLT_TAB(b, n)          (*(vuint32_t*)(b+0xE0+(n*4)))
 
 // -------------------------------------------------------------
-FlexCAN::FlexCAN(uint32_t baud, uint8_t id)
+FlexCAN::FlexCAN(uint32_t baud, uint8_t id, uint8_t txAlt, uint8_t rxAlt)
 {
   flexcanBase = FLEXCAN0_BASE;
 #ifdef __MK66FX1M0__
@@ -32,14 +32,23 @@ FlexCAN::FlexCAN(uint32_t baud, uint8_t id)
   // set up the pins
   if(flexcanBase == FLEXCAN0_BASE)
   {
-    // 3=PTA12=CAN0_TX, 4=PTA13=CAN0_RX
-    CORE_PIN3_CONFIG = PORT_PCR_MUX(2);
-    CORE_PIN4_CONFIG = PORT_PCR_MUX(2);// | PORT_PCR_PE | PORT_PCR_PS;
+#ifdef __MK66FX1M0__
+    //  3=PTA12=CAN0_TX,  4=PTA13=CAN0_RX (default)
+    // 29=PTB18=CAN0_TX, 30=PTB19=CAN0_RX (alternative)
+    if(txAlt == 1) CORE_PIN29_CONFIG = PORT_PCR_MUX(2); else CORE_PIN3_CONFIG = PORT_PCR_MUX(2); 
+    if(rxAlt == 1) CORE_PIN30_CONFIG = PORT_PCR_MUX(2); else CORE_PIN4_CONFIG = PORT_PCR_MUX(2);// | PORT_PCR_PE | PORT_PCR_PS; 
+#else   
+    //  3=PTA12=CAN0_TX,  4=PTA13=CAN0_RX (default)
+    // 32=PTB18=CAN0_TX, 25=PTB19=CAN0_RX (alternative)
+    if(txAlt == 1) CORE_PIN32_CONFIG = PORT_PCR_MUX(2); else CORE_PIN3_CONFIG = PORT_PCR_MUX(2); 
+    if(rxAlt == 1) CORE_PIN25_CONFIG = PORT_PCR_MUX(2); else CORE_PIN4_CONFIG = PORT_PCR_MUX(2);// | PORT_PCR_PE | PORT_PCR_PS;
+#endif
   }
 #ifdef __MK66FX1M0__
   else if(flexcanBase == FLEXCAN1_BASE)
   {
-    // 33=PTE24=CAN1_TX, 34=PTE25=CAN1_RX
+    // 33=PTE24=CAN1_TX, 34=PTE25=CAN1_RX (default)
+    // NOTE: Alternative CAN1 pins are not broken out on Teensy 3.6
     CORE_PIN33_CONFIG = PORT_PCR_MUX(2);
     CORE_PIN34_CONFIG = PORT_PCR_MUX(2);// | PORT_PCR_PE | PORT_PCR_PS;
   }

FlexCAN.h

@@ -30,7 +30,7 @@ class FlexCAN
   uint32_t flexcanBase;
 
 public:
-  FlexCAN(uint32_t baud = 125000, uint8_t id = 0);
+  FlexCAN(uint32_t baud = 125000, uint8_t id = 0, uint8_t txAlt = 0, uint8_t rxAlt = 0);
   void begin(const CAN_filter_t &mask);
   inline void begin()
   {

README.md

@@ -29,6 +29,16 @@ Please add parts you are using successfully with Teensy 3.1 to this list.
 - Linear LT1796 on 5V (not speedtested)
 
 ###Driver API
+**FlexCAN(baud, id, txAlt, rxAlt)**
+Create the FlexCAN object. The table below describes each parameter together with allowed values. Defaults are marked **bold**. When a non-allowed value is used default will be taken instead.
+
+| Parameter | Description          | Allowed values 
+|-----------|----------------------|------------------------------------------------------------------------
+| baud      | baudrate [bps]       | Teensy 3.1/3.2/3.6: 50000, 100000, **125000**, 250000, 500000, 1000000
+| id        | FlexCAN interface ID | Teensy 3.1/3.2: **0** (CAN0)<br>Teensy 3.6: **0** (CAN0), 1 (CAN1)
+| txAlt     | Alternative TX pin   | Teensy 3.1/3.2: **0** (PIN3), 1 (PIN32)<br>Teensy 3.6 CAN0: **0** (PIN3), 1 (PIN29)<br>Teensy 3.6 CAN1: **0** (PIN33)
+| rxAlt     | Alternative RX pin   | Teensy 3.1/3.2: **0** (PIN4), 1 (PIN25)<br>Teensy 3.6 CAN0: **0** (PIN4), 1 (PIN30)<br>Teensy 3.6 CAN1: **0** (PIN34)
+
 **begin()**
 Enable the CAN to start actively participating on the CANbus.