Added support for One-Shot Mode (OSM)

mcp2515.cpp

@@ -172,8 +172,14 @@ MCP2515::ERROR MCP2515::setNormalMode()
 
 MCP2515::ERROR MCP2515::setMode(const CANCTRL_REQOP_MODE mode)
 {
-    modifyRegister(MCP_CANCTRL, CANCTRL_REQOP, mode);
+    // Check for oneshot mode.
+    uint8_t mcpMode = osmFlag ? mode | CANCTRL_OSM : mode & ~(CANCTRL_OSM);
 
+    // Writing CANCTRL register.
+    modifyRegister(MCP_CANCTRL, CANCTRL_REQOP, mcpMode);
+
+    // Checking from CANSTAT register only confirms the main working modes,
+    // and interrupts. Bit 4 is unimplemented.
     unsigned long endTime = millis() + 10;
     bool modeMatch = false;
     while (millis() < endTime) {
@@ -764,3 +770,11 @@ uint8_t MCP2515::errorCountTX(void)
 {
     return readRegister(MCP_TEC);
 }
+
+void MCP2515::enableOSM(void) {
+    osmFlag = true;
+}
+
+void MCP2515::disableOSM(void) {
+    osmFlag = false;
+}

mcp2515.h

@@ -443,6 +443,7 @@ class MCP2515
         } RXB[N_RXBUFFERS];
 
         uint8_t SPICS;
+        bool osmFlag = false;
 
     private:
 
@@ -490,6 +491,10 @@ class MCP2515
         void clearERRIF();
         uint8_t errorCountRX(void);
         uint8_t errorCountTX(void);
+
+        // ONE SHOT MODE
+        void enableOSM(void);
+        void disableOSM(void);
 };
 
 #endif