DigiSpark

[TVRleigh]

Hi, If I use the example with a UNO it works fine but if I change the board to a DigiSpark, I get the following error.

C:\Users\Leigh\Documents\Arduino\libraries\SevenSegmentTM1637\src/SevenSegmentTM1637.h:134:10: error: conflicting return type specified for 'virtual size_t SevenSegmentTM1637::write(const char*)'

size_t write(const char* str);

[per1234]

Here's the problem: https://github.com/digistump/DigistumpArduino/blob/master/digistump-avr/cores/tiny/Print.h#L74

 virtual void write(const char *str);

and also: https://github.com/digistump/DigistumpArduino/blob/master/digistump-avr/cores/tiny/Print.h#L75

 virtual void write(const uint8_t *buffer, size_t size);

so the problem is the digistump-avr:tiny core's Print API is inconsistent with the arduino:arduino core's Print API in that those two versions of write() return void. I see the digistrump-avr:pro core doesn't have the issue so I guess it's intentional because of the limited memory of the ATtiny85.

It would be possible to fix this by using the preprocessor to change the function signatures:

#if defined(ARDUINO_AVR_DIGISPARK) && defined(__AVR_ATtiny85__)

I'm not sure if you consider it worth adding code to the library only to support a specific core.

[TVRleigh]

Thank you for your quick response at finding the problem.

I've looked into changing it, but I think its currently above my skill level. but as the code work on the PRO, I think I'll just use this board instead as its not much bigger. esp as I can write all the rest of the code I need and test with a UNO.

Its a shame though esp as the Spark only has 5 I/O so being able to have a display and 2 x IO would make this board a lot more usable.