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Original question:

TSC2007: TSC2007 not responding even after implementing POR

TSC2007: TSC2007 Touch query

Vivek kumar J
Prodigy 40 points
Part Number: TSC2007


I am working with TCS2007 Touch driver ic which uses  i2c protocol to communicate with my controller(Renesas s5d9)  Based on touch IRQ was generated , i can able to read the  TSC2007_MEASURE_TEMP0 and TSC2007_MEASURE_TEMP1  but i can't able to read  the x,y position from the screen.

Any one can help me with this issue...

refer the command byte listed below 

#define TSC2007_MEASURE_TEMP0 (0x0 << 4)
#define TSC2007_MEASURE_AUX (0x2 << 4)
#define TSC2007_MEASURE_TEMP1 (0x4 << 4)
#define TSC2007_ACTIVATE_XN (0x8 << 4)
#define TSC2007_ACTIVATE_YN (0x9 << 4)
#define TSC2007_ACTIVATE_YP_XN (0xa << 4)
#define TSC2007_SETUP (0xb << 4)
#define TSC2007_MEASURE_X (0xc << 4)
#define TSC2007_MEASURE_Y (0xd << 4)
#define TSC2007_MEASURE_Z1 (0xe << 4)
#define TSC2007_MEASURE_Z2 (0xf << 4)

#define TSC2007_POWER_OFF_IRQ_EN (0x0 << 2)
#define TSC2007_ADC_ON_IRQ_DIS0 (0x1 << 2)
#define TSC2007_ADC_OFF_IRQ_EN (0x2 << 2)
#define TSC2007_ADC_ON_IRQ_DIS1 (0x3 << 2)

#define TSC2007_12BIT (0x0 << 1)
#define TSC2007_8BIT (0x1 << 1)

#define MAX_12BIT ((1 << 12) - 1)

#define ADC_ON_12BIT (TSC2007_12BIT | TSC2007_ADC_ON_IRQ_DIS0)

#define READ_Y (ADC_ON_12BIT | TSC2007_MEASURE_Y)
#define READ_Z1 (ADC_ON_12BIT | TSC2007_MEASURE_Z1)
#define READ_Z2 (ADC_ON_12BIT | TSC2007_MEASURE_Z2)
#define READ_X (ADC_ON_12BIT | TSC2007_MEASURE_X)
#define PWRDOWN (TSC2007_12BIT | TSC2007_POWER_OFF_IRQ_EN)

  • 0
    TI__Mastermind 22950 points

    Hello Vivek,

    Unfortunately, we do not support driver issues. You may be able to find examples online that can help guide you. 

    Regards,

    Aaron

  • 0 in reply to Aaron Estrada
    Prodigy 40 points

    Hi Aaron,

                I can able to get the raw data of x,y positions (12 bit). I am using 800 x 480 pixel display.

    for example

       if i am touch one of the corner

    data should be like any one of this value (0,0) or (800,480) or (0,480) or (800,0)

              
             I am touching (left top)(164,3817)

                x=164,

               y=3817

         I am getting values like this, Is there any formula to convert into my resolution.

       I had verify with datasheet. 

    R_TOUCH =( ((RX−plate . XPosition) / 4096 ) ((4096 / Z1) -1)) - (RX−plate . (1-(YPosition/4096))

    But  i don't know about

    RX−plate & RY−plate 

    can you please explain this formula.

     

  • 0 in reply to Vivek kumar J
    TI__Mastermind 22950 points

    Hello Vivek,

    That formula is to calculate the Z coordinate. Sheet resistance is typically 300-400 ohms. 

    A calibration tool / library such as tslib is commonly used to deal with the mapping from the touch screen coordinates to the LCD coordinates.

    Regards,
    Aaron