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#107 UART lines lack pullup resistors

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opened 3 years ago by Michael Schloh von Bennewitz · 1 comments
Michael Schloh von Bennewitz commented 3 years ago

UART lines lack pullup resistors

Problem environment

Serial bus connections generally require pulling to VCC or GND for properly modulated waveforms.

Steps to reproduce

  1. Refer to the schematic
  2. Follow UART lines to connectors

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.

# UART lines lack pullup resistors ## Problem environment Serial bus connections generally require pulling to VCC or GND for properly modulated waveforms. ## Steps to reproduce 1. Refer to the schematic 1. Follow UART lines to connectors ## 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.
Michael Schloh von Bennewitz added the
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Michael Schloh von Bennewitz added this to the Final schematic and layout design milestone 3 years ago
Michael Schloh von Bennewitz commented 3 years ago
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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.

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.
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