You smell right :) I'm going to test with an external chip as soon as I receive my board . I'm going to test with the inb() and outb() functions too. Changes on DMX universe are varied : it can be 20 times per second but it can be 1 time per minute !
regards, Antonin --- In [email protected], "vincentdelau" <[EMAIL PROTECTED]> wrote: > > --- In [email protected], "zebulon7482" <totofri@> wrote: > > > > Hello, > > > > I'm certainly going to buy a foxboard but I have some questions...: > > I want to send (with the ttyS3 serial port at 250000 baud) 512 bytes > > (loaded in RAM), make a 88us break, 512 bytes, make a 88us break.... > > again and again in a background task. > > I smell DMX in the air! I already thought I smelled DMX when you where > asking about the 250kbaud UART, but this realy confirms this :) > > > - Will the fact of using an external chip (uc or FPGA) linked to the > > fox board with parallel port reduce the CPU load ? > > I'm not technical enough to make it work, but I was thinking to > implement a dedicated DMX device with a buffer in FPGA. This > transmitter could work on its own and you only would need to update the > RAM buffer when updating your DMX output. I think performance gain > depends on the usage. It might not help a lot when you update your DMX > universe a couple of times per second, but if changes are infrequent > the load is minimal. > > Kind regards, > > Vincent de Lau > [EMAIL PROTECTED] >
