I have tried the code you sent me but it's not working.
Do I need something like a resistor to ground the signal or how did
you troubleshoot this.
I am using a oscilloscope and I am basically connecting the ground of
the board and the scope and the other lead to the pin 12 but I don't
see changes.
Any idea ?
--- In "pekalo1" <> wrote:
>
> --- In "yanniepa" <yanniepa@> wrote:
> >
> > Hello,
> >
> > I would like to be able to change the logic level of a few IOs by
> > either writing to GPIOs pins or reading their state level.
> >
> > I used this sample code :
> >
> > int fd = open("/dev/mem", O_RDWR|O_SYNC);
> > char *gpioregs;
> > gpioregs = (char *)mmap(o,4096, PROT_READ|PROT_WRITE, MAP_SHARED, fd,
> > 0x12c00000);
> > gpioregs[0] = 0xff;
> > gpioregs[2] = 0x12; //1 on DIO_1 and DIO_4 and zero on others
> >
> > could someone help me with that ? I tried this and I see no changes on
> > the outputs levels on DIO_1 and DIO_4.
> >
> > I hope someone can help.
> > Thanks
> >
> > Yan~
> >
>
>
> Hi man
> try to use this code it is for DIO1 i use it and it is good
>
> volatile unsigned int *PBDR, *PBDDR;
> int fd = open("/dev/mem", O_RDWR|O_SYNC);
> GPIO1 = mmap(0, getpagesize(), PROT_READ|PROT_WRITE, MAP_SHARED, fd,
> 0x80840000);
> PBDR = (unsigned int *)(GPIO1 + 0x04); // port b data
> PBDDR = (unsigned int *)(GPIO1 + 0x14); // port b direction reg
> *PBDDR = 0x00; // set port b 0xff > output , 0x00 > input.
>
> then u can read or write to the Data Regester
> *PBDR..
>
> Hope to help u with this
>
> Best Regards
> khaled.
>
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