where the printing come from?

Projects Programming
1

Hi,
I'm testing a sketch as the code attached, the Serial Monitor shown: 'Enter setting mode fail' ...
My question is where the words 'Enter setting mode fail' text come from, there is nothing like it in the sketch.

#include <SPI.h>
#include "mcp_can.h"

///////////////////
// Configuration //
///////////////////

// CS pin for CAN bus shield.
// The default pin depends on the shield's version:
//  - 1.0: digital pin 10
//  - 1.1 and newer: digital pin 9
const int CS_PIN = 9;

// Serial port data rate
const long SERIAL_SPEED = 115200;

// CAN bus data rate
const byte CAN_SPEED = CAN_125KBPS;

///////////////////

MCP_CAN CAN(CS_PIN);
unsigned char len = 0;
byte buffer[8];

void setup() {
    //// Serial.begin(SERIAL_SPEED);

    Serial.begin(9600);
    byte canSpeed = CAN_SPEED;

    while (CAN.begin(canSpeed) != CAN_OK) {
      delay(100);
    }
}

void loop() {
    if (CAN.checkReceive() == CAN_MSGAVAIL) {
        CAN.readMsgBuf(&len, buffer);

        Serial.print("FRAME:ID=");
        Serial.print(CAN.getCanId());
        Serial.print(":LEN=");
        Serial.print(len);
        
        char tmp[3];
        for(int i = 0; i<len; i++) {
            Serial.print(":");
            
            snprintf(tmp, 3, "%02X", buffer[i]);
            
            Serial.print(tmp);
        }

        Serial.println();
    }
}

Thanks
Adam

post 26.JPG

2

I'm going to guess it comes from the library.
Why don't you take a look?

3

If you don't print it, then a library prints it: https://github.com/Seeed-Studio/CAN_BUS_Shield/blob/master/mcp_can.cpp#L665.

4

Thank you TheMemberFormerlyKnownAsAWOL and Koepel, you are right, it is from Lib.

All the best.

Adam

5

Koepel:
If you don't print it, then a library prints it: https://github.com/Seeed-Studio/CAN_BUS_Shield/blob/master/mcp_can.cpp#L665.

Thanks again Koepel,
Would you please let me know which line of the sketch trigged the printing?
Thanks
Adam

6

You use CAN.begin().

When you look into that file and search for "::begin", then it is at line 955. It calls mcp2515_init() which is at line 656 and when you scroll a little down, there it is.

When searching that file for "Serial.print" then you will see that they all are behind a "#if DEBUG_EN", wich is set to 1 in the file mcp_can_dfs.h.

7

Koepel:
You use CAN.begin().

When you look into that file and search for "::begin", then it is at line 955. It calls mcp2515_init() which is at line 656 and when you scroll a little down, there it is.

When searching that file for "Serial.print" then you will see that they all are behind a "#if DEBUG_EN", wich is set to 1 in the file mcp_can_dfs.h.

Thank you so much for help.
Best to you.
Adam