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In lugnet.robotics.nxt.nxthacking, Dick Swan wrote:
> Here's a trick to get a faster rate on the LCD display refresh.
Could you be a little more specific regarding the changes you made to this
method:
UBYTE DisplayUpdate(UWORD Height,UWORD Width,UBYTE *pImage)
{
static UWORD State = 0;
static UWORD Line;
if (State == 0)
{
if (DisplayWrite(CMD,(UBYTE*)DisplayInitString,sizeof(DisplayInitString)) ==
TRUE)
{
Line = 0;
State++;
}
}
else
{
if ((State & 1))
{
if (DisplayWrite(CMD,(UBYTE*)DisplayLineString[Line],3) == TRUE)
{
State++;
}
}
else
{
if (DisplayWrite(DAT,(UBYTE*)&pImage[Line * Width],ACTUAL_WIDTH) == TRUE)
{
State++;
if (++Line >= (Height / 8))
{
State = 0;
}
}
}
}
return (State);
}
So far everything I have tried has resulted in garbage on the screen. The
approach that I thought would work given the original description of the tweak
was along these lines:
if ((State & 1))
{
// always set the address for line zero
if (DisplayWrite(CMD,(UBYTE*)DisplayLineString[0],3) == TRUE)
State++;
}
else
{
if (DisplayWrite(DAT,(UBYTE*)&pImage[0],132*8) == TRUE)
State = 0;
}
Thanks in advance for the assistance!
John Hansen
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Message has 1 Reply:
 | | RE: Faster NXT LCD Screen Refresh
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| Change the init message for the LCD display driver to perform wrap around. Offset 12 in the following structure from 0x88 to 0x89. Otherwise it will keep overwriting the same line. Your code snippet doesn't show it, but I'm sure you kept the call (...) (17 years ago, 4-Apr-07, to lugnet.robotics.nxt.nxthacking)
|
Message is in Reply To:
| | Faster NXT LCD Screen Refresh
|
| Here's a trick to get a faster rate on the LCD display refresh. It currently takes 16 milliseconds to refresh the NXT LCD. 16 "messages" are sent to the LCD. One message is sent per millisecond. There are two messages from the ARM to the LCD for (...) (17 years ago, 22-Mar-07, to lugnet.robotics.nxt.nxthacking)
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