I just want to toggle an LED when the USART finishes receiving, so I wrote the following for the USART_RX_vect, but the LED never changes. However, the LED does toggle if move the code from the ISR into the main loop and precede it with while ( !(UCSR0A & (1<<UDRE0)) ); Can anyone describe my error…

Interrupt for USART RX on Atmega328p seems not to fire

system February 3, 2013, 12:13am 3

Thanks. That's instructive.

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