Serial.println() hangs in ISR

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i have isr handles keyboard inputs via mcp23s17 i/o expander.
i use serial.println() send debug messages within keyboard isr.
the problem if have more 3 calls serial.println() whole program hangs!!!

any ideas why happens???

so, did connect 23s17 external interrupt in arduino?

did of input signals change while sending data on serial?


Arduino Forum > Using Arduino > Programming Questions > Serial.println() hangs in ISR


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