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GPIO Speed UP ???

Topic last updated 24 Mar 2011, by -deleted-. 0 replies
-deleted-
24 Mar 2011

HI Guys,

Does anyone know if the complier/library has been speed up because this code <code>

  1. include "mbed.h" int main() { int dir = 0; LPC_GPIO0->FIODIR = dir; LPC_GPIO0->FIODIR = 0x07800000 | dir; LPC_GPIO0->FIOMASK = 0xF87FFFFF; while(1){ LPC_GPIO0->FIOSET = 0x07800000; LPC_GPIO0->FIOCLR = 0x07800000; } } <code>

now generates a 24MHz 3.3v waveform.

Im sure I got a very bad uneven sine wave at that frequency before an even then I couldn't do it with the while loop.

By the way this is amazing.

I am currently trying to get mbed to display a 80 x 60 VGA display by reducing the pixel clock rate down.

given the new I/O speed I may even be able to get more decent video out.

if anyone is interested in more details on how to do this feel free to ask Im happy to fill people in.