millis() and I2C

[palmerr23]

Hi folks,

I'm using both I2C (SSD1306 display) and millis() in an ATtiny85 project.

millis() seems to be running very slowly, around 1/10 the expected speed.

• ATtiny core 1.5.2
• Arduino 2.3.7
• Clock 8 MHz (internal) or 16 MHz (PLL)
• millis/micros enabled
• I2C 400 kHz using Wire

Is there some timer conflict between millis() and I2C?

[palmerr23]

May be related to

#916

as the millis() timer is correct at 1MHz & 4MHz

[hmeijdam]

Did you forget to do "burn bootloader" after you changed clockspeed?

[palmerr23]

Aah! That could be the issue.

Thanks.