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DS90UB949-Q1EVM: How to build 32-bits touchscreen controller in UB949+UB948 system?

Huang Sauron
Prodigy 50 points
Part Number: DS90UB949-Q1EVM

Tool/software:

Hi Ti-teams, 

Our Android system included Android board + DS90UB949-Q1EVM + UB948 + Touchscreen,

and touchscreen used 32-bits controller, and its timing was as below.

Android board connected to DS90UB949-Q1EVM's J20 connector for I2C communication.

We tried 2 settings for touch-controller interrupt (only scanned out its I2C-address 0x5D(7 bits)), but all failed touch-function. 

1. Interrupt of touch-controller connected to INTB-IN of UB948, then FPD-link, and connected INTB (J23 pin3 & pin4) of UB949-EVM, 

     I2C of Android board connected to J20 of UB949-EVM.

     Register setting of UB949: 0xC6 was 0x21, 0x03 was 0xDA, 0x07 was 0xBA(touch controller 8bits-address), 0x08 was 0xBA

     Register setting of UB948: 0x03 was 0xFB, 0x05 was 0x9E, 0x1E was 0x53

     (GPIO1: Touch IC interrupt active high Input, GPIO2: Touch IC Reset active low Output) 

2. Interrupt of touch-controller connected to GPIO1 of UB948, then FPD-link, and connected INTB (J23 pin3 & pin4) of UB949-EVM, 

    I2C of Android board connected to J20 of UB949-EVM.

    Register setting of UB949: 0x0E was 0x53, 0x03 was 0xDA, 0x07 was 0xBA(touch controller 8bits-address), 0x08 was 0xBA

    Register setting of UB948: 0x03 was 0xFB, 0x05 was 0x9E, 0x1E was 0x53

     (GPIO1: Touch IC interrupt active high Input, GPIO2: Touch IC Reset active low Output) 

Hope for your support

  • 0
    TI__Mastermind 22830 points

    Hello,

    While testing this did you have end-to-end video or pattern generation running? Please make sure you have LOCK and communication to DES working as expected.

    With the interrupt set up as described in the datasheet, did the interrupt signal arrive as expected? 

    For this touch controller communication to work, what is the speed needed to run? 

    Best regards,
    Ikram