I am using SPI to control LEDs via serial registers. Works fine: void loop() { SPI.transfer(matrica[1][1]); dilej(); SPI.transfer(matrica[1][2]); dilej(); SPI.transfer(matrica[1][3]); dilej(); } Doesn't work at all ISR(TIMER_1_COMPA_vect) { SPI.transfer(matrica[1][1]); dilej();…

SPI in loop() working fine, but not in ISR TIMER 1 interrupt

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