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Dangerous Prototypes

Dangerous Prototypes => Bus Pirate Support => Topic started by: wscrsurfdude on August 11, 2009, 04:35:18 pm

Title: UART on the bus pirate
Post by: wscrsurfdude on August 11, 2009, 04:35:18 pm
I have a problem with the option:
Output type:
 1. High-Z outputs (H=input, L=GND)
 2. Normal outputs (H=Vcc, L=GND)

If I choose 2 I get signal levels at 3.3V, OK this is working. If I choose 1, which pin is the input?
Title: Re: UART on the bus pirate
Post by: ian on August 11, 2009, 06:00:32 pm
Pinout is the same, see this diagram:
http://dangerousprototypes.com/2009/08/ ... tax-guide/ (http://dangerousprototypes.com/2009/08/08/bus-pirate-menu-protocol-and-syntax-guide/)

Mode 1 (Hi-Z or open drain mode) is for interfacing at something other than 3.3volts, it could be higher (5volts) or lower (1.8volts):
http://hackaday.com/2009/07/01/mixed-vo ... us-pirate/ (http://hackaday.com/2009/07/01/mixed-voltage-interfacing-with-the-bus-pirate/)

Hi-Z mode requires pull-up resistors:
http://dangerousprototypes.com/2009/07/ ... resistors/ (http://dangerousprototypes.com/2009/07/27/bus-pirate-practical-guide-to-pull-up-resistors/)
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