Forum Post: RE: AM335x Starter Kit Capacitive Touch Screen

Hi all,

I am trying to integrate capacitive touch panel with ft5306 on am335x custom board using android. but i am not getting any events on touching the screen.

The wake pin is connected to reset pin on the board, this pin has low signal at power on time and gets high after power on. The touch panel  interrupt is connected to a gpio, this pin has high value signal at power on and remains on low after boot up.

The touchscreen driver and gpio interrupt seems registered.

root@android:/ # getevent
add device 1: /dev/input/event0
  name:     "ft5x06_ts"
could not get driver version for /dev/input/mice, Not a typewriter
add device 2: /dev/input/event1
  name:     "gpio-keys"


^C
130|root@android:/ # cat /proc/bus/input/devices
I: Bus=0000 Vendor=0000 Product=0000 Version=0000
N: Name="ft5x06_ts"
P: Phys=
S: Sysfs=/devices/virtual/input/input0
U: Uniq=
H: Handlers=event0
B: PROP=0
B: EV=b
B: KEY=0
B: ABS=650000 0

I: Bus=0019 Vendor=0001 Product=0001 Version=0100
N: Name="gpio-keys"
P: Phys=gpio-keys/input0
S: Sysfs=/devices/platform/gpio-keys/input/input1
U: Uniq=
H: Handlers=kbd event1
B: PROP=0
B: EV=3
B: KEY=100000 0 0 0


root@android:/ # cat /proc/interrupts
           CPU0
 12:       5512      INTC  edma
 14:          0      INTC  edma_error
 18:          1      INTC  musb-hdrc.0
 19:          0      INTC  musb-hdrc.1
 36:       9337      INTC  da8xx_lcdc
 37:       4700      INTC  SGX ISR
 59:          0      INTC  ehrpwm_evt
 64:      20947      INTC  mmc0
 68:       6192      INTC  gp timer
 70:         18      INTC  omap_i2c
 71:          0      INTC  omap_i2c
 72:       1317      INTC  OMAP UART0
 75:          0      INTC  rtc0
 76:          0      INTC  rtc0
 77:          0      INTC  wkup_m3
 78:          1      INTC  wkup_m3_txev
 87:          0      INTC  ehrpwmTZ
166:          0      GPIO  ft5x0x_ts
211:          0      GPIO  power
Err:          0
root@android:/ #

But i am not getting any interrupts from the touch screen.

On the board_am335xevm.c file i made the following changes-

#define CAP_TSC_INT        GPIO_TO_PIN(0,6)

static void cap_tsc_init(int evm_id,int profile)
{
    setup_pin_mux(cap_tsc_pin_mux);
       return;
}

static struct pinmux_config cap_tsc_pin_mux[] = {
    {"spi0_cs1.gpio0_6",        OMAP_MUX_MODE7 | AM33XX_PIN_INPUT},
    {NULL,0},     

};

static struct i2c_board_info am335x_i2c_boardinfo1[] = {
    {
        I2C_BOARD_INFO("ft5x06_ts",0x38),
        .irq = OMAP_GPIO_IRQ(CAP_TSC_INT),
    },
};

static void i2c1_init(int evm_id, int profile)
{
    setup_pin_mux(i2c1_pin_mux);
    omap_register_i2c_bus(2, 100, am335x_i2c_boardinfo1,
            ARRAY_SIZE(am335x_i2c_boardinfo1));
    return;
}

Could anyone please provide some points to proceed further.

Regards,

Ebin