Gustl-
Good comments. I might add that some C64x GPIO pins may not have a defined
power-on
state, but that can be dealt with by adding appropriate pull-up/pull-down Rs.
-Jeff
Bernhard 'Gustl' Bauer wrote:
>
> Hi,
>
> I would suggest you read your LCD data sheet carefully. The things you
> have to consider:
> - Do LCD voltage levels fit with GPIO voltage levels. If not use a
> driver.
> - GPIO pins have a default power on state. Choose your pinning so that
> LCD can work with this.
> - A lot of LCDs have an internal reset circuit. Give LCD enough time
> to come out of reset before normal communication.
> - Be sure to meet the timming requirements of the LCD. Verify with an
> osci.
>
> HTH
>
> Gustl
>
> asif bagwan schrieb:
> >
> >
> > hellow freinds I m interfacing 16x2 LCD through GPIO port and its
> > connection are as follows
> > HPI_PIN_NO. GPIO_PIN_NO. LCD_PIN
> > 11
> > 4 R/S(4)
> >
> > 80 2
> > RW (5)
> >
> > 15 3
> > EN(6)
> >
> > 19 8
> > 7
> >
> > 22 9
8
> >
> > 21 10
> > 9
> >
> > 24 11
10
> >
> >
> > 23 12
11
> >
> >
> > 26 13
> > 12
> >
> > 25 14
> > 13
> >
> > 28 15
> > 14
> >
> >
> >
> > I am using GPIO lines as shown above.but still not getting characters.It
> > is correct to connect LCD as shown above.
> >
> > Plz suggest me for the correction and it is required to connect LCD
> > drivver to LCD
> >
> > PLZ guide me
> >
> > -asif
>