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Buttons: Correct some comments left after last button-related change: 32- vs 8-bit bit set.
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@@ -78,7 +78,7 @@ void board_button_initialize(void)
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*
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* Description:
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* After board_button_initialize() has been called, board_buttons() may be called to
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* collect the state of all buttons. board_buttons() returns an 8-bit bit set
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* collect the state of all buttons. board_buttons() returns an 32-bit bit set
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* with each bit associated with a button. See the BUTTON* definitions
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* above for the meaning of each bit in the returned value.
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*
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