'What does this common SPI function do?
I see this function in Arduino scripts using SPI: ISR (SPI_STC_vect). I am familiar with C but this doesn't seem to follow - it looks like a function though there is no return type definition, and the argument doesn't make sense. I am new to SPI and cannot find much/any documentation online. Other functions which run during an interrupt are called using attachInterrupt, however this doesn't seem to be called anywhere.
Solution 1:[1]
ISR() is a macro that introduces an interrupt handler.
SPI_STC_vect is a Serial Transfer Complete interrupt vector.
See here for complete documentation, including the list of available interrupt vectors.
Sources
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Source: Stack Overflow
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