--- In "amit" <> wrote:
>
> Please suggest me something.
> Waiting for some Response...
> --- In "ts7300" <ts7300@> wrote:
> >
> > Can somebody assist me upon this.
> > By default 3V is coming at DIO1 pin4.what data register value I supposed to
> > set to toggle the o/p 3.3v and 0v.
> > Will it be PCDR:0xFE for 0v??
> > PCDR:0X01 FOR 1V.??
No. As Jason suggested, these are binary, on-or-off.
> > --- In "ts7300" <ts7300@> wrote:
> > >
> > > Have doubt in manual mention make bit0 as output for portC.For LED ON
> > > *PCDR &= 0xFF; and For LED OFF *PCDR &= 0x00; These data value I have
> > > to Give.
> > > --- In "ts7300" <ts7300@> wrote:
> > > >
> > > > I am using TS-7300 and want to control the I/0 of board via connecting
> > > > LED to I/O Board.And using DIO1 PIN4 of board.
> > > > Below are the C code:
> > > > #include<unistd.h>
> > > > #include<sys/types.h>
> > > > #include<sys/mman.h>
> > > > #include<stdio.h>
> > > > #include<fcntl.h>
> > > > #include<string.h>
> > > >
> > > > int main(int argc, char **argv)
> > > > {
> > > > unsigned char *start;
> > > > volatile unsigned int *PCDR, *PCDDR;
> > > > int fd = open("/dev/mem", O_RDWR);
> > > >
> > > >
> > > > start = mmap(0, getpagesize(), PROT_READ|PROT_WRITE, MAP_SHARED, fd,
> > > > 0x80840000);
> > > > PCDR = (unsigned int *)(start + 0x08); // port c data register
> > > > PCDDR = (unsigned int *)(start + 0x18); // port c direction
> > > > register
> > > >
> > > > *PCDDR = 0x01; // Make bit 0 an output Port C bit 0 is connected to
> > > > the LED
You just clobbered whatever else was in *PCDDR already. Use
*PCDDR |= 0x01 to do this without clobbering other data in the register.
> > > >
> > > > *PCDR &= 0xFE; // Turn the LED on
*PCDR |= 0x01 // Turn on bit 1 without affecting other bits
> > > > sleep(30); // Output on for 30 seconds
> > > > *PCDR |= 0x01; // Turn the LED off
*PCDR &= 0xFE // Turn off bit 1 without affecting other bits
Note that 0xFE = ~0x01. Manipulating bit values like this will be very
important in the rest of your class ....
regards, ........ Charlie
> > > >
> > > > close(fd);
> > > > return 0;
> > > > }
> > > > And Problem is that after 30 seconds its no becoming low(LED off).Keep
> > > > on giving +3V on PIN4 of Board.
> > > > Will anybody have an idea about that???
> > > >
> > >
> >
>
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