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Hi all, I have configured the McBSP #1 as GPIO (RRST_ = 0 RIOEN = 1). When I read the voltage on that pin (the pin is not connected, working with 5509 EVM from Spectrum Digital), I read 0 but the DSP read a logical 1 If I link the pin to the ground, the DSP sees a 0. Looks like I need a Pull down. Here is my problem : what is the recommended value for the resistor? Thanks in advance Laurent

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I am not clear about what you are measuring. When you say, "I read 0", how are you measuring this? If the pin is at 0 volts, it should read as a 0 to the DSP. If connecting a ground to this pin makes the DSP read a 0 instead of a 1, then the pin can not be at 0 volts. This information is not consistent. At 01:55 PM 9/30/02, lfouilhac wrote: >Hi all, > >I have configured the McBSP #1 as GPIO (RRST_ = 0 RIOEN = 1). When I >read the voltage on that pin (the pin is not connected, working with >5509 EVM from Spectrum Digital), I read 0 but the DSP read a logical >1 >If I link the pin to the ground, the DSP sees a 0. >Looks like I need a Pull down. >Here is my problem : what is the recommended value for the resistor? > >Thanks in advance > >Laurent Rick Collins Arius - A Signal Processing Solutions Company Specializing in DSP and FPGA design http://www.arius.com 4 King Ave 301-682-7772 Voice Frederick, MD 21701-3110 301-682-7666 FAX

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