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DS90UB941AS-Q1: How to realize the touch screen at the back end of deserializer

Amy Luo
Expert 6895 points
Part Number: DS90UB941AS-Q1

Hi team,

I forward the customer's questions as follows

At present, the LCD display is normal.

At the back end of the 924, there is also a touch screen. The IIC signal line and interrupt signal line of the touch screen are connected to the 924 chip.


The connection is shown in the figure above: the I2C address of the touch is 0x24

set the 941 register

SlaveID_0 Register (Address = 0x7) = 0x24 <<1;

SlaveAlias_0 Register (Address = 0x8) = 0x25 << 1;

GENERAL_CFG Register (Address = 3h)= 0xfa;

I2C_CONTROL Register (Address = 0x17) = 0x9e;

After that, use the command to see that the touch device cannot be found

trinket:/ # i2cdetect -y 0
0 1 2 3 4 5 6 7 8 9 a b c d e f
00: -- -- -- -- -- -- -- -- -- UU -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- -- -- -- -- -- -- -- -- -- 2c -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- --

Register 3h and register 17h, I set PASS_THROUGH or PASS_ALL respectively, but I can't find touch

How can I drive the touch screen? What's the idea?

Does the driver code of the touch screen need to be combined with the driver code of 941 / 924?

Best Regards，

Amy Luo

  • 0
    TI__Guru 66810 points

    Hi Amy, 

    Thanks for your question. 

    Amy Luo said:
    After that, use the command to see that the touch device cannot be found

    What is the device address of the touch controller?

    Amy Luo said:
    How can I drive the touch screen? What's the idea?

    Can you elaborate on what customer is trying to do? Initialize the touch controller? Read registers from touch controller, etc? 

    Amy Luo said:
    Does the driver code of the touch screen need to be combined with the driver code of 941 / 924?

    Yes, you can address the touch controller directly and read/write from it. 

    Regards, 

    Logan