#include <core_cm0plus.h> compiling

using blinky example get attached erro. Using win 7 1010 processor. happens to other programs to. I reload Arduino program still occurs. any suggestions thanks.

In file included from C:\Users\Al\AppData\Local\Arduino15\packages\arduino\tools\CMSIS-Atmel\1.2.0/CMSIS/Device/ATMEL/samd21/include/samd21.h:69:0,
from C:\Users\Al\AppData\Local\Arduino15\packages\arduino\tools\CMSIS-Atmel\1.2.0/CMSIS/Device/ATMEL/samd.h:105,
from C:\Users\Al\AppData\Local\Arduino15\packages\arduino\tools\CMSIS-Atmel\1.2.0/CMSIS/Device/ATMEL/sam.h:540,
from C:\Users\Al\AppData\Local\Arduino15\packages\arduino\hardware\samd\1.8.6\cores\arduino/Arduino.h:48,
from C:\Users\Al\AppData\Local\Temp\arduino_build_941703\sketch\Blink.ino.cpp:1:
C:\Users\Al\AppData\Local\Arduino15\packages\arduino\tools\CMSIS-Atmel\1.2.0/CMSIS/Device/ATMEL/samd21/include/samd21g18a.h:237:10: fatal error: core_cm0plus.h: No such file or directory
#include <core_cm0plus.h>
compilation terminated.


Turns an LED on for one second, then off for one second, repeatedly.

Most Arduinos have an on-board LED you can control. On the UNO, MEGA and ZERO
it is attached to digital pin 13, on MKR1000 on pin 6. LED_BUILTIN is set to
the correct LED pin independent of which board is used.
If you want to know what pin the on-board LED is connected to on your Arduino
model, check the Technical Specs of your board at:

modified 8 May 2014
by Scott Fitzgerald
modified 2 Sep 2016
by Arturo Guadalupi
modified 8 Sep 2016
by Colby Newman

This example code is in the public domain.


// the setup function runs once when you press reset or power the board
void setup() {
// initialize digital pin LED_BUILTIN as an output.

// the loop function runs over and over again forever
void loop() {
digitalWrite(LED_BUILTIN, HIGH); // turn the LED on (HIGH is the voltage level)
delay(1000); // wait for a second
digitalWrite(LED_BUILTIN, LOW); // turn the LED off by making the voltage LOW
delay(1000); // wait for a second


Could you take a few moments to Learn How To Use The Forum.

Other general help and troubleshooting advice can be found here. It will help you get the best out of the forum in the future.

Some boards out there require you to specify the built in LED explicitly by pin number.

Are you able to select the exact board and COM port it is using ? If not then you may need to install the board cores using the board manager.

Also what additional security do you have on the computer (although I don't think that is your issue)

Which board are you using? I can see it uses the SAMD core, does the board have an on-board LED?

Have you tried reinstalling the SAMD core package?