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

[Fabio Giovagnini <fabio.giovagnini@aurion-tech.com>]

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

Aurion s.r.l.
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