Since I connected the ttyS0 Tx of overo air/fire to a logic 1 Tx(by mistake) or logic 1 Rx of AVR(voltage level
converted already), the ttyS0 could not work any more, the voltage level of Tx of three ttyS0 on each board are
1.8V, 0V, 1V when I power overo, and the 1.8V Tx cannot send any signal, the 1V Tx can send signals, the 0V Tx
has no reaction. Anyone had this problem or similar one before? I don't confirm the ttyS0 has been damaged or
not. If it is damaged, is it possible to repair it by returning factory? If it is not damaged, how should I do to make it
work again. Any help will be great appreciated.
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