Re: Hi guys, does any of you have experience with touchscreen controllers?

Fabio Giovagnini
2010-04-26T07:13:47Z

In data domenica 25 aprile 2010 04:26:51, Dale Larson ha scritto:
: > Fabio Giovagnini wrote:
> > I'm working with ADS7843 and I have some troubles to get only the push
> > event on the screen.
> > If any of you knows a better place where to talk about this argument it
> > will be appreciated very much to tell me.
> >
> > Best regards
>
> Hi Fabio,
>
> I've dealt with that chip for our 7760 board. The key is to provide a pen
> poll function so pen up can be detected. Here's the way I defined it in the
> platform bsp stuff:
>
>
>
> #include <linux/spi/spi.h>
> #include <linux/spi/ads7846.h>
>
>
> /* SPI devices - Touch Screen */
>
> static int ads7843_pendown_state(void)
> {
> return (ctrl_inb(PGDR) & 0x40) ? 0 : 1;
> }
Is this the pin where is connected the INT line of the ADS7843?

Thanks

>
> static struct ads7846_platform_data ads_info = {
> .model = 7843,
> .x_min = 150,
> .x_max = 3830,
> .y_min = 190,
> .y_max = 3830,
> .vref_delay_usecs = 100,
> .keep_vref_on = 1,
> .x_plate_ohms = 576,
> .y_plate_ohms = 366,
> .pressure_max = 15000, /* Generally nonsense on the 7843 */
> .debounce_max = 1,
> .debounce_rep = 0,
> .debounce_tol = (~0),
> .get_pendown_state = ads7843_pendown_state,
> };
>
> static struct spi_board_info jcinap_spi_devices[] = {
> {
> /* Touchscreen controller */
> .modalias = "ads7846",
> .chip_select = 0,
> .bus_num = 0,
> .max_speed_hz = 1000000, /* 1Mhz */
> .platform_data = &ads_info,
> .irq = 11
> },
> };
>
>
>
> In the init code:
>
>
>
> /* Register the SPI devices */
> spi_register_board_info(jcinap_spi_devices,
> ARRAY_SIZE(jcinap_spi_devices));
>
>
>
> Dale Larson
> Johnson Controls, Inc
>
>
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--
Fabio Giovagnini

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