The SparkFun CAN-Bus shield works on the SparkFun SAMD21 Dev Breakout board?
I am working on add CAN communication for a SparkFun SAMD21 Dev Breakout board.
We haven’t tried this before, but I don’t think it would work without some
modification to at least the shield and possibly the code. Unfortunately our
library is NOT compatible with the SAMD21 so you’d end up having to
find a different library OR write your own. This shield was developed long
before the SAMD21 Breakout existed and it’s really meant to be used with
an Arduino Uno and it’s going to take some work to get it running on a SAMD.
At a minimum, you’re going to need some sort of logic level shifting between
the 5 volt CAN Bus Shield and the 3.3 volt SAMD21.
I have worked with the MCP2515 Microchip CAN Controller and MCP2551 Microchip CAN Transceiver , the VCC for both is 3.3VDC .
https://www.instructables.com/id/Yes-We … 30-Seconds
I did not succeed on get the D11 MISO and D12 MOSI working.
I do not know how to make the D10 SS, D11 MISO, D12 MODI and D13 SCK work.
I have flashed this sketch , but I still don’t have pins D11 and D12 working. Any idea ?
Edited by moderator to add code tags
/*********************************************************************
Sample code for setting up additional Serial ports on a SamD21 board
In this example the Redboard Turbo is used with the 16x2 SerLCD display
For more information on the SerLCD code check out the github repo
https://github.com/sparkfun/OpenLCD
https://www.sparkfun.com/products/14812
https://www.sparkfun.com/products/14072
By: Michelle Shorter - SparkFun Electronics
License: This code is public domain but you buy me a burger
if you use this and we meet someday (Beefware license).
**********************************************************************/
#include <SPI.h>
#include <wiring_private.h> // pinPeripheral() function
#define CSPIN 10
#define Time 25
//D12-MISO, D11-MOSI, D13-SCK
SPIClass SPI2 (&sercom1, 12, 13, 11, SPI_PAD_0_SCK_1, SERCOM_RX_PAD_3);
int i = 0;
void setup() {
// put your setup code here, to run once:
//Get all pins and SPI ports setup
SPI2.begin();
pinPeripheral(12, PIO_SERCOM_ALT);
pinPeripheral(11, PIO_SERCOM_ALT);
pinPeripheral(13, PIO_SERCOM);
pinMode(CSPIN, OUTPUT);
digitalWrite(CSPIN, HIGH); //make sure it is high to start
SPI2.setClockDivider(SPI_CLOCK_DIV128); //Slow down the master a bit
//Reset the screen, set backlight, etc.
digitalWrite(CSPIN, LOW);// Select the screen before sending
SPI2.transfer('|');//Setting character
SPI2.transfer('-');//Clear display
SPI2.transfer('|');//Put LCD into setting mode
SPI2.transfer(158 + 0); //Set green backlight amount to 0%
SPI2.transfer('|');//Put LCD into setting mode
SPI2.transfer(188 + 10); //Set blue backlight amount to 0%
SPI2.transfer('|');//Put LCD into setting mode
SPI2.transfer(128 + 5); //Set white/red backlight amount to (15=51% 100%=+29)
delay(Time);
digitalWrite(CSPIN, HIGH);// Deselect the screen after sending
delay(1000);//Each setting change prints an output, this delay allows them to be printed before trying to keep going
//Send Welcome Text
char tempString[50]; //Needs to be large enough to hold the entire string with up to 5 digits
sprintf(tempString, "Welcome ");
spiSendString(tempString);
delay(1500);
}
void loop() {
// put your main code here, to run repeatedly:
//Clear the screen, then send the Counting string
digitalWrite(CSPIN, LOW);// Select the screen before sending
SPI2.transfer('|');//Setting character
SPI2.transfer('-');//Clear display
delay(Time);
digitalWrite(CSPIN, HIGH);// Deselect the screen after sending
char tempString[50]; //Needs to be large enough to hold the entire string with up to 5 digits
sprintf(tempString,"Counting: %d ", i);
spiSendString(tempString);
i++;
delay(1000-Time);
}
//Sends a string over SPI
void spiSendString(char* data)
{
digitalWrite(CSPIN, LOW); //Drive the CS pin low to select OpenLCD
for(byte x = 0 ; data[x] != '\0' ; x++) //Send chars until we hit the end of the string
SPI2.transfer(data[x]);
digitalWrite(CSPIN, HIGH); //Release the CS pin to de-select OpenLCD
}
OK, this is a completely different sketch than what you’d use for the CAN bus shield.
I think you might be setting up the SERCOM wrong, but I’ll need a bit of time to dig into this.
If you try the code below with these connections, does the display work?
D3 - SDO
D4 - SDI
D5 - SCK
D6 - /CS
/*********************************************************************
Sample code for setting up additional Serial ports on a SamD21 board
In this example the Redboard Turbo is used with the 16x2 SerLCD display
For more information on the SerLCD code check out the github repo
https://github.com/sparkfun/OpenLCD
https://www.sparkfun.com/products/14812
https://www.sparkfun.com/products/14072
By: Michelle Shorter - SparkFun Electronics
License: This code is public domain but you buy me a burger
if you use this and we meet someday (Beefware license).
**********************************************************************/
#include <SPI.h>
#include "wiring_private.h" // pinPeripheral() function
#define CSPIN 6
#define Time 25
//D3-MISO, D4-MOSI, D5-SCK
SPIClass SPI2 (&sercom2, 3, 5, 4, SPI_PAD_0_SCK_3, SERCOM_RX_PAD_1);
int i = 0;
void setup() {
// put your setup code here, to run once:
//Get all pins and SPI ports setup
SPI2.begin();
pinPeripheral(3, PIO_SERCOM_ALT);
pinPeripheral(4, PIO_SERCOM_ALT);
pinPeripheral(5, PIO_SERCOM);
pinMode(CSPIN, OUTPUT);
digitalWrite(CSPIN, HIGH); //make sure it is high to start
SPI2.setClockDivider(SPI_CLOCK_DIV128); //Slow down the master a bit
//Reset the screen, set backlight, etc.
digitalWrite(CSPIN, LOW);// Select the screen before sending
SPI2.transfer('|');//Setting character
SPI2.transfer('-');//Clear display
SPI2.transfer('|');//Put LCD into setting mode
SPI2.transfer(158 + 0); //Set green backlight amount to 0%
SPI2.transfer('|');//Put LCD into setting mode
SPI2.transfer(188 + 10); //Set blue backlight amount to 0%
SPI2.transfer('|');//Put LCD into setting mode
SPI2.transfer(128 + 5); //Set white/red backlight amount to (15=51% 100%=+29)
delay(Time);
digitalWrite(CSPIN, HIGH);// Deselect the screen after sending
delay(1000);//Each setting change prints an output, this delay allows them to be printed before trying to keep going
//Send Welcome Text
char tempString[50]; //Needs to be large enough to hold the entire string with up to 5 digits
sprintf(tempString, "Welcome ");
spiSendString(tempString);
delay(1500);
}
void loop() {
// put your main code here, to run repeatedly:
//Clear the screen, then send the Counting string
digitalWrite(CSPIN, LOW);// Select the screen before sending
SPI2.transfer('|');//Setting character
SPI2.transfer('-');//Clear display
delay(Time);
digitalWrite(CSPIN, HIGH);// Deselect the screen after sending
char tempString[50]; //Needs to be large enough to hold the entire string with up to 5 digits
sprintf(tempString,"Counting: %d ", i);
spiSendString(tempString);
i++;
delay(1000-Time);
}
//Sends a string over SPI
void spiSendString(char* data)
{
digitalWrite(CSPIN, LOW); //Drive the CS pin low to select OpenLCD
for(byte x = 0 ; data[x] != '\0' ; x++) //Send chars until we hit the end of the string
SPI2.transfer(data[x]);
digitalWrite(CSPIN, HIGH); //Release the CS pin to de-select OpenLCD
}
@Niryo One did any of the scripts above allow for the full SPI pins (MOSI, MISO, CS,CLK)? I am in the same boat and not able to use pins D10-13 OR D3-6 for SPI.