Initial CAN Bus support.

.gitmodules

@@ -113,3 +113,7 @@
 	path = Sming/Libraries/ArduinoJson5/ArduinoJson
 	url = https://github.com/bblanchon/ArduinoJson.git
 	ignore = dirty
+[submodule "Libraries.MCP_CAN_lib"]
+	path = Sming/Libraries/MCP_CAN_lib
+	url = https://github.com/coryjfowler/MCP_CAN_lib.git
+	ignore = dirty

samples/CanBus/.cproject

@@ -0,0 +1,151 @@
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samples/CanBus/.project

@@ -0,0 +1,28 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<projectDescription>
+	<name>CanBus</name>
+	<comment></comment>
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samples/CanBus/Makefile

@@ -0,0 +1,9 @@
+#####################################################################
+#### Please don't change this file. Use component.mk instead ####
+#####################################################################
+
+ifndef SMING_HOME
+$(error SMING_HOME is not set: please configure it as an environment variable)
+endif
+
+include $(SMING_HOME)/project.mk

samples/CanBus/app/application.cpp

@@ -0,0 +1,57 @@
+#include <SmingCore.h>
+
+#include <Libraries/MCP_CAN_lib/mcp_can.h>
+#include <SPI.h>
+
+unsigned long rxId = 0;
+uint8_t len = 0;
+uint8_t rxBuf[8] = {0};
+
+uint8_t txBuf0[] = {0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55};
+uint8_t txBuf1[] = {0x55, 0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55, 0xAA};
+
+MCP_CAN canBus0(10); // CAN0 interface using CS on digital pin 10
+MCP_CAN canBus1(9);  // CAN1 interface using CS on digital pin 9
+
+Timer loopTimer;
+
+void loop()
+{
+	if(!digitalRead(2)) {						 // If pin 2 is low, read CAN0 receive buffer
+		canBus0.readMsgBuf(&rxId, &len, rxBuf);  // Read data: len = data length, buf = data byte(s)
+		canBus1.sendMsgBuf(rxId, 1, len, rxBuf); // Immediately send message out CAN1 interface
+	}
+	if(!digitalRead(3)) {						 // If pin 3 is low, read CAN1 receive buffer
+		canBus1.readMsgBuf(&rxId, &len, rxBuf);  // Read data: len = data length, buf = data byte(s)
+		canBus0.sendMsgBuf(rxId, 1, len, rxBuf); // Immediately send message out CAN0 interface
+	}
+}
+
+void init()
+{
+	Serial.begin(SERIAL_BAUD_RATE);
+
+	// init CAN0 bus, baudrate: 250k@16MHz
+	if(canBus0.begin(MCP_EXT, CAN_250KBPS, MCP_16MHZ) == CAN_OK) {
+		Serial.print("CAN0: Init OK!\r\n");
+		canBus0.setMode(MCP_NORMAL);
+	} else {
+		Serial.print("CAN0: Init Fail!!!\r\n");
+	}
+
+	// init CAN1 bus, baudrate: 250k@16MHz
+	if(canBus1.begin(MCP_EXT, CAN_250KBPS, MCP_16MHZ) == CAN_OK) {
+		Serial.print("CAN1: Init OK!\r\n");
+		canBus1.setMode(MCP_NORMAL);
+	} else {
+		Serial.print("CAN1: Init Fail!!!\r\n");
+	}
+
+	// Set SPI to run at 8MHz (16MHz / 2 = 8 MHz)
+	SPI.beginTransaction(SPISettings(8000000, MSBFIRST, SPI_MODE3));
+
+	canBus0.sendMsgBuf(0x1000000, 1, 8, txBuf0);
+	canBus1.sendMsgBuf(0x1000001, 1, 8, txBuf1);
+
+	loopTimer.initializeMs(1000, loop).start();
+}

samples/CanBus/component.mk

@@ -0,0 +1,3 @@
+ARDUINO_LIBRARIES := MCP_CAN_lib 
+
+DISABLE_SPIFFS = 1