Hello,
> Here is the code that I am using... It works for turning the LCD
> power off but I am not able to turn it back on unless i reboot.. any
> help on this will help..
The register you are reading/writing is an 8 bit register, try using an i
unsigned char pointer.
//Eddie
> --- In "kendwyer" <> wrote:
>>
>> 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 <eddie@> 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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