Hi i'm trying to make mcp2515 work (cheap chinese board with tja1050 and 8mhz oscillator) with arduino nano.
connection:
NANO-------board
d8-----------int
d10----------ss
d11----------si
d12----------so
d13----------sck
gnd----------gnd
5v----------- Vcc
I'm using coryjfowler library and I'm trying loopback example, obviously modifying int pin 2-> 8 and sck pin 10-> 13
The sketch:
/* CAN Loopback Example
* This example sends a message once a second and receives that message
* no CAN bus is required. This example will test the functionality
* of the protocol controller, and connections to it.
*
* Written By: Cory J. Fowler - October 5th 2016
*/
#include <mcp_can.h>
#include <SPI.h>
// CAN TX Variables
unsigned long prevTX = 0; // Variable to store last execution time
const unsigned int invlTX = 1000; // One second interval constant
byte data[] = {0xAA, 0x55, 0x01, 0x10, 0xFF, 0x12, 0x34, 0x56}; // Generic CAN data to send
// CAN RX Variables
long unsigned int rxId;
unsigned char len;
unsigned char rxBuf[8];
// Serial Output String Buffer
char msgString[128];
// CAN0 INT and CS
#define CAN0_INT 8 // Set INT to pin 2
MCP_CAN CAN0(13); // Set CS to pin 10
void setup()
{
Serial.begin(115200); // CAN is running at 500,000BPS; 115,200BPS is SLOW, not FAST, thus 9600 is crippling.
// Initialize MCP2515 running at 16MHz with a baudrate of 500kb/s and the masks and filters disabled.
if(CAN0.begin(MCP_ANY, CAN_500KBPS, MCP_8MHZ) == CAN_OK)
Serial.println("MCP2515 Initialized Successfully!");
else
Serial.println("Error Initializing MCP2515...");
// Since we do not set NORMAL mode, we are in loopback mode by default.
//CAN0.setMode(MCP_LOOPBACK);
pinMode(CAN0_INT, INPUT); // Configuring pin for /INT input
Serial.println("MCP2515 Library Loopback Example...");
}
void loop()
{
if(!digitalRead(CAN0_INT)) // If CAN0_INT pin is low, read receive buffer
{
CAN0.readMsgBuf(&rxId, &len, rxBuf); // Read data: len = data length, buf = data byte(s)
if((rxId & 0x80000000) == 0x80000000) // Determine if ID is standard (11 bits) or extended (29 bits)
sprintf(msgString, "Extended ID: 0x%.8lX DLC: %1d Data:", (rxId & 0x1FFFFFFF), len);
else
sprintf(msgString, "Standard ID: 0x%.3lX DLC: %1d Data:", rxId, len);
Serial.print(msgString);
if((rxId & 0x40000000) == 0x40000000){ // Determine if message is a remote request frame.
sprintf(msgString, " REMOTE REQUEST FRAME");
Serial.print(msgString);
} else {
for(byte i = 0; i<len; i++){
sprintf(msgString, " 0x%.2X", rxBuf[i]);
Serial.print(msgString);
}
}
Serial.println();
}
if(millis() - prevTX >= invlTX){ // Send this at a one second interval.
prevTX = millis();
byte sndStat = CAN0.sendMsgBuf(0x100, 8, data);
if(sndStat == CAN_OK)
Serial.println("Message Sent Successfully!");
else
Serial.println("Error Sending Message...");
}
}
/*********************************************************************************************************
END FILE
*********************************************************************************************************/
I have doubly checked connections and tested continuity between mcp board and arduino and everything seems correct.
the result I get on the com port is always this:
Entering Configuration Mode Failure...
Error Initializing MCP2515...
MCP2515 Library Loopback Example...
Error Sending Message...
Error Sending Message...
Error Sending Message...
Error Sending Message...
Error Sending Message...
Error Sending Message...
Error Sending Message...
what am I doing wrong? please help me I don't know what I missed ... Thanks to those who want to help me greetings
