[ts-7000] Re: Ts- 7260 LCD Power

["kendwyer" <>]

Hi,

If you are not using peek8 etc and are using C code to access the
power management register make sure you use 8bit read and write accesses. 

For example:

....
.......

unsigned char *dat, *start;
unsigned char *PSREGc;

int fd1 = open("/dev/mem", O_RDWR);
start = mmap(0, getpagesize(), PROT_READ|PROT_WRITE, MAP_SHARED,fd1,
0x12000000);
dat = start; // read the register at addr
printf("Power Saving Register read data = 0x%x\n",*dat);

PSREGc = start;
 
*PSREGc = 0x09 ; // write to Power Saving Register, turn off USB and
LCD 5V supply
dat = start; // read the Power Saving Register
printf("Power Saving Register read data = 0x%x\n",*dat);

*PSREGc = 0x0f ; // write to Power Saving Register, turn on USB and
LCD 5V supply
dat = start; // read the Power Saving Register
printf("Power Saving Register read data = 0x%x\n",*dat);

close(fd1);

....
.....


Ken


--- In  Eddie Dawydiuk <> wrote:
>
> Hello,
> 
> > My problem I am trying to use the power management option on the LCD's
> > I tried following the data sheet. The problem I am encountering is
that
> > the LCD powers of, but it doesn't power on when its set to do so. when
> > you change bit 2 of the register to 0 all other bits change to zero as
> > well.
> 
> I'm unable to reproduce this, could you post some code demonstrating
> this?
> 
> e.g.
> 
>   $ peek8 0x12000000
>   0x7
>   $ poke8 0x12000000 0x3
>   $ peek8 0x12000000
>   0x3
>   $ poke8 0x12000000 0x7
>   $ peek8 0x12000000
>   0x7
>   $
> 
> //Eddie
>




 
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