GPIO speed

tiffanychen · ‎2008-10-08

Posted on October 09, 2008 at 05:54

GPIO speed

tiffanychen · ‎2011-05-17

Posted on May 17, 2011 at 09:51

Now I run PLL at 96MHZ PLL and FLASH at 48MHZ, when I set one GPIO from

0->1->0, it takes about 400ns... is it normal?

But if I calculate the ideal speed of it, it should be less than 50ns, right? Because I need to use GPIO to simulate parallel port data/address... now the actual speed of GPIO is too slow... Is anyone know how to improve it? Please kindly give me advices.

Thank you very much.

m_j_butcher · ‎2011-05-17

Posted on May 17, 2011 at 09:51

Hi

See:

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http://www.st.com/mcu/forums-cat-4852-html

>

6MHz square wave (12MHz toggle)is achievable.

Regards

Mark

http://www.uTasker.com

electrogvlieghe · ‎2011-05-17

Posted on May 17, 2011 at 09:51

Hello,

I develop an application with the STR9-Comstick. The idea is to control the I/O ports with a program in Visual Basic through the USB-B connector near the pins of I/O ports.

Which dll use for that for the enumeration ?

The first application will be to generate a TTL signal for differents frequencies through a pin of the I/O ports. Is there a way to program it in C (TTL signal) for the STR9 ? And so the program in VB ?

Regards

Vlieghe Guillaume