Function store_char() (in HardwareSerial.cpp), called from USART interrupt, use % division, which is mutch slower (208 ticks, as i measure), than & operation. If divider is power of 2, why not use & ? For example: #define SERIAL_BUFFER_SIZE 64 ..... int i = (unsigned int)(buffer->head + 1) % SER…

% Division in USART interrupt code...

system January 6, 2012, 5:00am 10

Sounds like someone needs to submit a patch

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