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Discussion Groups | Freescale DSPs | WHY the state the GPIO of PE3(dsp56f807) doesn't change

Technical discussions about Freescale (Motorola) DSPs (including the DSP56000, DSP56300, DSP56600, 56800 DSPs).

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WHY the state the GPIO of PE3(dsp56f807) doesn't change - dj sunny - Feb 28 7:31:09 2007

      hi,
i use the PE3 as a output signal,i have make a program:
{ periphMemWrite(0x0000,&ArchIO.PortE.PeripheralReg);

periphMemWrite(0x00f0,&ArchIO.PortE.DataDirectionReg); 

periphMemWrite(0x0000,&ArchIO.PortE.DataReg);
}
/************************************************/
{ 
periphBitSet(0x0008,&ArchIO.PortE.DataDirectionReg);

periphBitClear(0x0008,&ArchIO.PortE.DataReg);
}

The result is the level of PE3 doesn't change,nomatter the PE3 of DataReg is 1 or 0,why?How to
modify?thanks

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Re: WHY the state the GPIO of PE3(dsp56f807) doesn't change - mvin...@atlas.cz - Mar 21 7:20:11 2007

The GPIOE3_A7 pin is shared with the external bus (address line 7). This can cause your
problem.