Add support for listen only mode

Author: ThyMYthOS

FlexCAN.cpp

@@ -115,6 +115,11 @@ void FlexCAN::setFilter(const CAN_filter_t &filter, uint8_t n)
   }
 }
 
+// -------------------------------------------------------------
+void FlexCAN::setListenOnlyMode(void)
+{
+  FLEXCAN0_CTRL1 |= FLEXCAN_CTRL_LOM;
+}
 
 // -------------------------------------------------------------
 int FlexCAN::available(void)

FlexCAN.h

@@ -35,6 +35,7 @@ class FlexCAN
     begin(defaultMask);
   }
   void setFilter(const CAN_filter_t &filter, uint8_t n);
+  void setListenOnlyMode(void);
   void end(void);
   int available(void);
   int write(const CAN_message_t &msg);

README.md

@@ -46,6 +46,12 @@ Enable the CAN to start actively participating on the CANbus.  Enable reception
 **setFilter(filter, number)**
 Set the receive filter selected by number, 0-7.  When using filters it is required to set them all. If the application uses less than 8 filters, duplicate one filter for the unused ones.
 
+**setListenOnlyMode()**
+Enable the listen only mode. Can only be set before calling begin() or after end().
+In this mode, transmission is disabled, all error counters are frozen and the module
+operates in a CAN Error Passive mode. Only messages acknowledged by another
+CAN station will be received.
+
 The mask and filter are **CAN_filter_t** type structures.
 
 ###Caller Blocking Support

keywords.txt

@@ -2,6 +2,7 @@ FlexCAN	KEYWORD1
 
 begin	KEYWORD2
 setFilter	KEYWORD2
+setListenOnlyMode KEYWORD2
 end	KEYWORD2
 read	KEYWORD2
 write	KEYWORD2