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#107 UART lines lack pullup resistors
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créé il y a 4 ans par Michael Schloh von Bennewitz
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UART lines lack pullup resistors
Problem environment
Serial bus connections generally require pulling to VCC or GND for properly modulated waveforms.
Steps to reproduce
Expected result
UART lines have internal or external pullup resistors.
Actual result
It's unknown if the UART lines require pullups or if this resistance is already internally provided.
Procedure
Using a oscilloscope, observe the UART waveform before and after applying resistance pulling.
Severity level
This is medium priority because while project requirements state no serial communication an implicit requirement to provide input output is present.
This report was made in response to UART corruption, resolved in bug #118. It's unlikely that hard coded pullup resistance is desired, because the MCU can probably provide the resistance selectively.