DigiSpark Attiny85 fix for compiling errors due to missing gnu++11 flag

Compiling can fail with all sorts of errors, due to a missing -std=gnu++11 flag in:

"C:\Users\%username%\AppData\Local\Arduino15\packages\digispark\hardware\avr\1.0.0\platform.txt"

I got it working modifying compiler.cpp.flags= by adding the missing flag at the end of the list, like so:

compiler.cpp.flags=-c -g -Os -w -fno-exceptions -ffunction-sections -fdata-sections -MMD -std=gnu++11

After this, everything is fine !

Sketch uses 5910 bytes (98%) of program storage space. Maximum is 6012 bytes. Global variables use 181 bytes of dynamic memory. Running Digispark Uploader... Plug in device now... (will timeout in 60 seconds)

By the way, I am running the Attiny85 slave on pin 0 (contrary to the suggested pin 2, because I needed all the A0-A3):

/*   4CH ADC over 1-Wire  
          +-DigiSpark-----------------+
          |  __                       |
          | /  \               A0 [o] |1 P5
          | \__/               A2 [o]~|3 P4 USB-
         ++-----+              A3 [o] |2 P3 USB+
         | uUSB |  i0 SCK  SCL A1 [o]~|7 P2 USCK
         ++--__-+     MISO        [ ]~|6 P1
          | /  \      MOSI SDA    [o]~|5 P0 AREF
          | \__/  [o][o][ ]           | 
          +------------------Attiny85-+          
                  5V GND Vin(6-16V)
*/

constexpr uint8_t pin_onewire   { 0 }; //0 is P0, 1 is P1

and it worked well, 4x DS18B20 are received on the master which is a NANO running orgua's OneWire.h (but I still can't get the DS2450 to work without a CRC error, neither on the NANO as slave nor the Attiny85 as slave, and I am not sure if it's due to the CRC calculation itself or a bus timing issue - logic analyser should arrive soon :champagne: ).

In summary, I fixed my compiling issues by adding the above mentioned flag. Oh, and OneWireHub is an awesome library!

orgua / OneWireHub

DigiSpark Attiny85 fix for compiling errors due to missing gnu++11 flag #60