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Micah- Ha this makes me laugh. The desperate search for C54xx GPIO. I guess we're not the only ones. On a recent design, Nithin and I finally gave up and put down a little 6 x 6 mm CPLD. For that "concession", we got 45 I/O -- about 15 of those used to allow the DSP to read/write bytes in I/O space -- so around 30 effective. Also we had to fork over board space for a tiny LDO (3 x 5 mm) to generate 1.8v Vcc Core for the CPLD. But it does give us a lot of GPIO, with flexible direction, latched if needed, LEDs if you need them, etc. -Jeff Micah Caudle wrote: > > I've only worked with 5402 but I've considered some > desparation ideas for extra GPIO's. For instance, > unused EMIF signals like address lines, PS, DS, IS or > IOSTRB. With any of those things you can use dummy > memory writes to change the state of those lines > keeping in mind wait states and other technicalities. > On a TX half of a McBSP in serial port mode (not GPIO) > I use the BCLK line to provide a master clock for > another chip and still get general purpose output > pulses on it's BFSX line by writing a dummy value into > it's DXR reg. The length of the pulse and polarity is > even programmable with that method! You can get > creative and look for odd stuff like that. I can't > think of anything for extra inputs and haven't used > any TOUT's. > -Micah > > > > > Message: 1 > > Date: Tue, 08 Feb 2005 16:44:53 -0000 > > From: "Nithin Rajagopal" <> > > Subject: TOUT as GPIO > > > > > > > > Hi > > I dont see anything mentioned in the C5416 datasheet > > about the TOUT > > (timer out) pin being able to be used as a GPIO pin. > > Is it still > > possible to configure this pin as GPIO just as it is > > in some of the > > other DSPs of the C54x series? Also, i was wondering > > if there any > > GPIO pins other than the HD lines, MCBSP signals, XF > > and BIO on the > > C5416. I am in need of GPIO pins (directly from DSP) > > for one of our > > designs. We are not using an external logic like > > CPLD, latch..etc due > > to space constraints. > > > > Thank you > > > > Regards > > Nithin > > > > __________________________________ > |