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DS90UB949-Q1EVM: Deserializer device touch interrupt now received

Vivek Karna
Prodigy 130 points
Part Number: DS90UB949-Q1EVM
Other Parts Discussed in Thread: ALP

Hello TI members,

I have got some issues with my SerDeser setup.

The setup is as follows, I have a touch display connected to DS-948 Deserializer and DS-949 Serializer is connected to the Deser using an LVDS cable. The touch display is used to generate the interrupt to the GPIO0, and then the Deser sends the interrupt of the touch by back-channel to the Ser, and we received the interrupt by reading the INTB of the Serializer. The register that has been set to enable the touch to interrupt is, 

Deser side: 0x1D - GPIO0 Config - 0x13

Ser side: 0xC6 - 0x21

When the touch interrupt is received by the Serializer then the INTB is low, and when the 0xC7 register of the Serializer is read, then the touch interrupt is cleared, so when again the touch is generated it is detected by the Ser.

The issue is that, after some time of use, sometimes, within 2 min, the touch interrupt is received by the Serializer. If I touch the touch display, then no interruption is acknowledged by the Serializer, and the INTB pin is always high. Can you please let me know where can be the issue, and how can I debug the issue? Is there any register to look on Deser side, so that I can know if the Touch display is generating any interrupt or not, or we can reset the Deserializer, please tell me, how can I debug the issue.

Thanks.

Regards,

Vivek Karna

  • 0
    TI__Expert 4160 points

    Hi Vivek,

    Thank you for your question!

    Vivek Karna said:
    The issue is that, after some time of use, sometimes, within 2 min, the touch interrupt is received by the Serializer.

    So you are noticing that after some time, the serializer is getting no interrupts? 

    Can you give a register dump of when it is behaving normal? ie. You are able to get interrupts by the deserializer without any issue

    Can you give a register dump of when this behavior is abnormal? ie. you are not able to get interrupts even when touching the screen.

    Vivek Karna said:
    Is there any register to look on Deser side

    Can you monitor the INTB_IN pin on the deserializer? That pin on the des should be pulled low by the downstream device (i.e your screen). If this is not being pulled low by the downstream device, then the des is not getting the interrupt

    Can you also monitor the Lock pin on the deserializer when you are unable to get interrupts?

    Respectfully,

    William Y.

  • 0 in reply to William Yi
    Prodigy 130 points

    Please find it.

    Serializer Register before hang:


    [REGISTERS]
    Device = ALP Nano 1 - DS90UB949, Connector 1
    Comments = "N/A"
    Date = 10/21/2022
    Reg = 0,0x0000,0x1C
    Reg = 0,0x0001,0x00
    Reg = 0,0x0003,0xDA
    Reg = 0,0x0004,0x80
    Reg = 0,0x0005,0x00
    Reg = 0,0x0006,0x58
    Reg = 0,0x0007,0xA0
    Reg = 0,0x0008,0xB0
    Reg = 0,0x0009,0x00
    Reg = 0,0x000A,0x24
    Reg = 0,0x000B,0x01
    Reg = 0,0x000C,0x17
    Reg = 0,0x000D,0x20
    Reg = 0,0x000E,0x00
    Reg = 0,0x000F,0x00
    Reg = 0,0x0010,0x00
    Reg = 0,0x0011,0x00
    Reg = 0,0x0012,0x00
    Reg = 0,0x0013,0xC8
    Reg = 0,0x0014,0x00
    Reg = 0,0x0015,0x01
    Reg = 0,0x0016,0xFE
    Reg = 0,0x0017,0x1E
    Reg = 0,0x0018,0x7F
    Reg = 0,0x0019,0x7F
    Reg = 0,0x001A,0x01
    Reg = 0,0x001B,0x00
    Reg = 0,0x001C,0x00
    Reg = 0,0x001D,0x00
    Reg = 0,0x001E,0x05
    Reg = 0,0x001F,0xF6
    Reg = 0,0x0020,0x0B
    Reg = 0,0x0021,0x00
    Reg = 0,0x0022,0x25
    Reg = 0,0x0023,0x00
    Reg = 0,0x0024,0x00
    Reg = 0,0x0025,0x00
    Reg = 0,0x0026,0x00
    Reg = 0,0x0027,0x00
    Reg = 0,0x0028,0x01
    Reg = 0,0x0029,0x20
    Reg = 0,0x002A,0x20
    Reg = 0,0x002B,0xA8
    Reg = 0,0x002C,0x00
    Reg = 0,0x0030,0x00
    Reg = 0,0x0031,0x00
    Reg = 0,0x0032,0x00
    Reg = 0,0x0033,0x00
    Reg = 0,0x0034,0x00
    Reg = 0,0x0035,0x00
    Reg = 0,0x0036,0x00
    Reg = 0,0x0037,0x00
    Reg = 0,0x0038,0x00
    Reg = 0,0x0039,0x00
    Reg = 0,0x003A,0x00
    Reg = 0,0x003B,0x00
    Reg = 0,0x003C,0x00
    Reg = 0,0x003D,0x00
    Reg = 0,0x003E,0x00
    Reg = 0,0x003F,0x00
    Reg = 0,0x0040,0x14
    Reg = 0,0x0041,0x55
    Reg = 0,0x0042,0x00
    Reg = 0,0x0043,0x00
    Reg = 0,0x0044,0x80
    Reg = 0,0x0045,0x00
    Reg = 0,0x0046,0x00
    Reg = 0,0x0047,0x00
    Reg = 0,0x0048,0x01
    Reg = 0,0x0049,0x68
    Reg = 0,0x004A,0x01
    Reg = 0,0x004B,0xB0
    Reg = 0,0x004C,0x04
    Reg = 0,0x004D,0x00
    Reg = 0,0x004E,0x00
    Reg = 0,0x004F,0x00
    Reg = 0,0x0050,0x97
    Reg = 0,0x0051,0xA1
    Reg = 0,0x0052,0x1E
    Reg = 0,0x0053,0x00
    Reg = 0,0x0054,0xA8
    Reg = 0,0x0055,0x0C
    Reg = 0,0x0056,0x00
    Reg = 0,0x0057,0x00
    Reg = 0,0x0058,0x00
    Reg = 0,0x0059,0x00
    Reg = 0,0x005A,0xCD
    Reg = 0,0x005B,0x20
    Reg = 0,0x005C,0x02
    Reg = 0,0x005D,0x06
    Reg = 0,0x005E,0x44
    Reg = 0,0x005F,0x9D
    Reg = 0,0x0060,0x22
    Reg = 0,0x0061,0x02
    Reg = 0,0x0062,0x00
    Reg = 0,0x0064,0x10
    Reg = 0,0x0065,0x00
    Reg = 0,0x0066,0x00
    Reg = 0,0x0067,0x00
    Reg = 0,0x0068,0x00
    Reg = 0,0x0069,0x00
    Reg = 0,0x006A,0x00
    Reg = 0,0x006B,0x00
    Reg = 0,0x006C,0x00
    Reg = 0,0x0070,0x00
    Reg = 0,0x0071,0x00
    Reg = 0,0x0072,0x00
    Reg = 0,0x0073,0x00
    Reg = 0,0x0074,0x00
    Reg = 0,0x0075,0x00
    Reg = 0,0x0076,0x00
    Reg = 0,0x0077,0x00
    Reg = 0,0x0078,0x00
    Reg = 0,0x0079,0x00
    Reg = 0,0x007A,0x00
    Reg = 0,0x007B,0x00
    Reg = 0,0x007C,0x00
    Reg = 0,0x007D,0x00
    Reg = 0,0x0080,0x00
    Reg = 0,0x0081,0x00
    Reg = 0,0x0082,0x00
    Reg = 0,0x0083,0x00
    Reg = 0,0x0084,0x00
    Reg = 0,0x0090,0x00
    Reg = 0,0x0091,0x00
    Reg = 0,0x0092,0x00
    Reg = 0,0x0093,0x00
    Reg = 0,0x0094,0x00
    Reg = 0,0x0098,0x00
    Reg = 0,0x0099,0x00
    Reg = 0,0x009A,0x00
    Reg = 0,0x009B,0x00
    Reg = 0,0x009C,0x00
    Reg = 0,0x009D,0x00
    Reg = 0,0x009E,0x00
    Reg = 0,0x009F,0x00
    Reg = 0,0x00A0,0x00
    Reg = 0,0x00A1,0x00
    Reg = 0,0x00A2,0x00
    Reg = 0,0x00A3,0x00
    Reg = 0,0x00C0,0x00
    Reg = 0,0x00C1,0x00
    Reg = 0,0x00C2,0xA8
    Reg = 0,0x00C3,0x00
    Reg = 0,0x00C4,0x78
    Reg = 0,0x00C5,0x38
    Reg = 0,0x00C6,0x21
    Reg = 0,0x00C7,0x00
    Reg = 0,0x00C8,0xC0
    Reg = 0,0x00C9,0x00
    Reg = 0,0x00CA,0x00
    Reg = 0,0x00CB,0x00
    Reg = 0,0x00CC,0x00
    Reg = 0,0x00CE,0xFF
    Reg = 0,0x00D0,0x00
    Reg = 0,0x00D1,0x00
    Reg = 0,0x00D2,0x00
    Reg = 0,0x00D3,0x00
    Reg = 0,0x00E0,0x00
    Reg = 0,0x00E1,0x00
    Reg = 0,0x00E2,0xA8
    Reg = 0,0x00E3,0x00
    Reg = 0,0x00E4,0x68
    Reg = 0,0x00E5,0x38
    Reg = 0,0x00E6,0x21
    Reg = 0,0x00E7,0x00
    Reg = 0,0x00F0,0x5F
    Reg = 0,0x00F1,0x55
    Reg = 0,0x00F2,0x42
    Reg = 0,0x00F3,0x39
    Reg = 0,0x00F4,0x34
    Reg = 0,0x00F5,0x39
    Reg = 0,0x00F6,0x00
    Reg = 0,0x00F8,0x00
    Reg = 0,0x00F9,0x00

    Deser register before hang:

    [REGISTERS]
    Device = ALP Nano 1 - DS90UB948, Connector 1
    Comments = "N/A"
    Date = 10/21/2022
    Reg = 0,0x0000,0x58
    Reg = 0,0x0001,0x04
    Reg = 0,0x0002,0x00
    Reg = 0,0x0003,0xF0
    Reg = 0,0x0004,0xFE
    Reg = 0,0x0005,0x1E
    Reg = 0,0x0006,0x00
    Reg = 0,0x0007,0x1C
    Reg = 0,0x0008,0x00
    Reg = 0,0x0009,0x00
    Reg = 0,0x000A,0x00
    Reg = 0,0x000B,0x00
    Reg = 0,0x000C,0x00
    Reg = 0,0x000D,0x00
    Reg = 0,0x000E,0x00
    Reg = 0,0x000F,0x00
    Reg = 0,0x0010,0x00
    Reg = 0,0x0011,0x00
    Reg = 0,0x0012,0x00
    Reg = 0,0x0013,0x00
    Reg = 0,0x0014,0x00
    Reg = 0,0x0015,0x00
    Reg = 0,0x0016,0x00
    Reg = 0,0x0017,0x00
    Reg = 0,0x0018,0x00
    Reg = 0,0x0019,0x01
    Reg = 0,0x001A,0x00
    Reg = 0,0x001B,0xF3
    Reg = 0,0x001C,0x3B
    Reg = 0,0x001D,0x13
    Reg = 0,0x001E,0x00
    Reg = 0,0x001F,0x00
    Reg = 0,0x0020,0x00
    Reg = 0,0x0021,0x00
    Reg = 0,0x0022,0x40
    Reg = 0,0x0023,0x20
    Reg = 0,0x0024,0x08
    Reg = 0,0x0025,0x00
    Reg = 0,0x0026,0x14
    Reg = 0,0x0027,0x26
    Reg = 0,0x0028,0x11
    Reg = 0,0x0029,0x00
    Reg = 0,0x002A,0x00
    Reg = 0,0x002B,0x00
    Reg = 0,0x002C,0x00
    Reg = 0,0x002D,0x00
    Reg = 0,0x002E,0x00
    Reg = 0,0x002F,0x00
    Reg = 0,0x0030,0x00
    Reg = 0,0x0031,0x00
    Reg = 0,0x0032,0x90
    Reg = 0,0x0033,0x25
    Reg = 0,0x0034,0x01
    Reg = 0,0x0035,0x00
    Reg = 0,0x0036,0x00
    Reg = 0,0x0037,0x88
    Reg = 0,0x0038,0x00
    Reg = 0,0x0039,0x00
    Reg = 0,0x003A,0x00
    Reg = 0,0x003B,0x05
    Reg = 0,0x003C,0x20
    Reg = 0,0x003D,0xE0
    Reg = 0,0x003E,0x23
    Reg = 0,0x003F,0x00
    Reg = 0,0x0040,0x43
    Reg = 0,0x0041,0x03
    Reg = 0,0x0042,0x03
    Reg = 0,0x0043,0x00
    Reg = 0,0x0044,0x60
    Reg = 0,0x0045,0x88
    Reg = 0,0x0046,0x00
    Reg = 0,0x0047,0x00
    Reg = 0,0x0048,0x0F
    Reg = 0,0x0049,0x00
    Reg = 0,0x004A,0x00
    Reg = 0,0x004B,0x00
    Reg = 0,0x004C,0x00
    Reg = 0,0x004D,0x00
    Reg = 0,0x004E,0x63
    Reg = 0,0x004F,0x00
    Reg = 0,0x0050,0x03
    Reg = 0,0x0051,0x10
    Reg = 0,0x0052,0x00
    Reg = 0,0x0053,0x01
    Reg = 0,0x0054,0x80
    Reg = 0,0x0055,0x00
    Reg = 0,0x0056,0x00
    Reg = 0,0x0057,0x00
    Reg = 0,0x0058,0x00
    Reg = 0,0x0059,0x7F
    Reg = 0,0x005A,0x20
    Reg = 0,0x005B,0x20
    Reg = 0,0x005C,0x00
    Reg = 0,0x005D,0x00
    Reg = 0,0x005E,0x00
    Reg = 0,0x005F,0x00
    Reg = 0,0x0060,0x00
    Reg = 0,0x0061,0x00
    Reg = 0,0x0062,0x00
    Reg = 0,0x0063,0x00
    Reg = 0,0x0064,0x10
    Reg = 0,0x0065,0x00
    Reg = 0,0x0066,0x00
    Reg = 0,0x0067,0x00
    Reg = 0,0x0068,0x00
    Reg = 0,0x0069,0x00
    Reg = 0,0x006E,0x01
    Reg = 0,0x006F,0x00
    Reg = 0,0x0070,0x00
    Reg = 0,0x0071,0x00
    Reg = 0,0x0072,0x00
    Reg = 0,0x0073,0x07
    Reg = 0,0x0074,0x07
    Reg = 0,0x0075,0x08
    Reg = 0,0x0076,0x00
    Reg = 0,0x0077,0x00
    Reg = 0,0x0078,0x00
    Reg = 0,0x0079,0x00
    Reg = 0,0x007A,0x00
    Reg = 0,0x007B,0x5D
    Reg = 0,0x007C,0x02
    Reg = 0,0x0080,0x00
    Reg = 0,0x0081,0x00
    Reg = 0,0x0082,0x00
    Reg = 0,0x0083,0x00
    Reg = 0,0x0084,0x00
    Reg = 0,0x0090,0x00
    Reg = 0,0x0091,0x00
    Reg = 0,0x0092,0x00
    Reg = 0,0x0093,0x00
    Reg = 0,0x0094,0x00
    Reg = 0,0x0098,0x00
    Reg = 0,0x0099,0x00
    Reg = 0,0x009A,0x00
    Reg = 0,0x009B,0x00
    Reg = 0,0x009C,0x00
    Reg = 0,0x009D,0x00
    Reg = 0,0x009E,0x00
    Reg = 0,0x009F,0x00
    Reg = 0,0x00C0,0x00
    Reg = 0,0x00C1,0x00
    Reg = 0,0x00C3,0x00
    Reg = 0,0x00C4,0x00
    Reg = 0,0x00C5,0x00
    Reg = 0,0x00C8,0xC0
    Reg = 0,0x00C9,0x00
    Reg = 0,0x00CA,0x00
    Reg = 0,0x00CB,0x00
    Reg = 0,0x00CC,0x00
    Reg = 0,0x00E0,0x00
    Reg = 0,0x00E1,0x00
    Reg = 0,0x00E2,0x00
    Reg = 0,0x00E3,0x00
    Reg = 0,0x00E8,0x00
    Reg = 0,0x00E9,0x00
    Reg = 0,0x00EA,0x00
    Reg = 0,0x00F0,0x5F
    Reg = 0,0x00F1,0x55
    Reg = 0,0x00F2,0x42
    Reg = 0,0x00F3,0x39
    Reg = 0,0x00F4,0x34
    Reg = 0,0x00F5,0x38
    Reg = 0,0x00F6,0x00
    Reg = 0,0x00F8,0x00
    Reg = 0,0x00F9,0x00

    Serializer register after hang:

    [REGISTERS]
    Device = ALP Nano 1 - DS90UB949, Connector 1
    Comments = "N/A"
    Date = 10/21/2022
    Reg = 0,0x0000,0x1C
    Reg = 0,0x0001,0x00
    Reg = 0,0x0003,0xDA
    Reg = 0,0x0004,0x80
    Reg = 0,0x0005,0x00
    Reg = 0,0x0006,0x58
    Reg = 0,0x0007,0xA0
    Reg = 0,0x0008,0xB0
    Reg = 0,0x0009,0x00
    Reg = 0,0x000A,0x24
    Reg = 0,0x000B,0x01
    Reg = 0,0x000C,0x17
    Reg = 0,0x000D,0x20
    Reg = 0,0x000E,0x00
    Reg = 0,0x000F,0x00
    Reg = 0,0x0010,0x00
    Reg = 0,0x0011,0x00
    Reg = 0,0x0012,0x00
    Reg = 0,0x0013,0xC8
    Reg = 0,0x0014,0x00
    Reg = 0,0x0015,0x01
    Reg = 0,0x0016,0xFE
    Reg = 0,0x0017,0x1E
    Reg = 0,0x0018,0x7F
    Reg = 0,0x0019,0x7F
    Reg = 0,0x001A,0x01
    Reg = 0,0x001B,0x00
    Reg = 0,0x001C,0x00
    Reg = 0,0x001D,0x00
    Reg = 0,0x001E,0x05
    Reg = 0,0x001F,0xF6
    Reg = 0,0x0020,0x0B
    Reg = 0,0x0021,0x00
    Reg = 0,0x0022,0x25
    Reg = 0,0x0023,0x00
    Reg = 0,0x0024,0x00
    Reg = 0,0x0025,0x00
    Reg = 0,0x0026,0x00
    Reg = 0,0x0027,0x00
    Reg = 0,0x0028,0x01
    Reg = 0,0x0029,0x20
    Reg = 0,0x002A,0x20
    Reg = 0,0x002B,0xA8
    Reg = 0,0x002C,0x00
    Reg = 0,0x0030,0x00
    Reg = 0,0x0031,0x00
    Reg = 0,0x0032,0x00
    Reg = 0,0x0033,0x00
    Reg = 0,0x0034,0x00
    Reg = 0,0x0035,0x00
    Reg = 0,0x0036,0x00
    Reg = 0,0x0037,0x00
    Reg = 0,0x0038,0x00
    Reg = 0,0x0039,0x00
    Reg = 0,0x003A,0x00
    Reg = 0,0x003B,0x00
    Reg = 0,0x003C,0x00
    Reg = 0,0x003D,0x00
    Reg = 0,0x003E,0x00
    Reg = 0,0x003F,0x00
    Reg = 0,0x0040,0x14
    Reg = 0,0x0041,0x55
    Reg = 0,0x0042,0x00
    Reg = 0,0x0043,0x00
    Reg = 0,0x0044,0x80
    Reg = 0,0x0045,0x00
    Reg = 0,0x0046,0x00
    Reg = 0,0x0047,0x00
    Reg = 0,0x0048,0x01
    Reg = 0,0x0049,0x68
    Reg = 0,0x004A,0x01
    Reg = 0,0x004B,0xB0
    Reg = 0,0x004C,0x04
    Reg = 0,0x004D,0x00
    Reg = 0,0x004E,0x00
    Reg = 0,0x004F,0x00
    Reg = 0,0x0050,0x97
    Reg = 0,0x0051,0xA1
    Reg = 0,0x0052,0x1E
    Reg = 0,0x0053,0x00
    Reg = 0,0x0054,0xA8
    Reg = 0,0x0055,0x0C
    Reg = 0,0x0056,0x00
    Reg = 0,0x0057,0x00
    Reg = 0,0x0058,0x00
    Reg = 0,0x0059,0x00
    Reg = 0,0x005A,0xCD
    Reg = 0,0x005B,0x20
    Reg = 0,0x005C,0x02
    Reg = 0,0x005D,0x06
    Reg = 0,0x005E,0x44
    Reg = 0,0x005F,0x9D
    Reg = 0,0x0060,0x22
    Reg = 0,0x0061,0x02
    Reg = 0,0x0062,0x00
    Reg = 0,0x0064,0x10
    Reg = 0,0x0065,0x00
    Reg = 0,0x0066,0x00
    Reg = 0,0x0067,0x00
    Reg = 0,0x0068,0x00
    Reg = 0,0x0069,0x00
    Reg = 0,0x006A,0x00
    Reg = 0,0x006B,0x00
    Reg = 0,0x006C,0x00
    Reg = 0,0x0070,0x00
    Reg = 0,0x0071,0x00
    Reg = 0,0x0072,0x00
    Reg = 0,0x0073,0x00
    Reg = 0,0x0074,0x00
    Reg = 0,0x0075,0x00
    Reg = 0,0x0076,0x00
    Reg = 0,0x0077,0x00
    Reg = 0,0x0078,0x00
    Reg = 0,0x0079,0x00
    Reg = 0,0x007A,0x00
    Reg = 0,0x007B,0x00
    Reg = 0,0x007C,0x00
    Reg = 0,0x007D,0x00
    Reg = 0,0x0080,0x00
    Reg = 0,0x0081,0x00
    Reg = 0,0x0082,0x00
    Reg = 0,0x0083,0x00
    Reg = 0,0x0084,0x00
    Reg = 0,0x0090,0x00
    Reg = 0,0x0091,0x00
    Reg = 0,0x0092,0x00
    Reg = 0,0x0093,0x00
    Reg = 0,0x0094,0x00
    Reg = 0,0x0098,0x00
    Reg = 0,0x0099,0x00
    Reg = 0,0x009A,0x00
    Reg = 0,0x009B,0x00
    Reg = 0,0x009C,0x00
    Reg = 0,0x009D,0x00
    Reg = 0,0x009E,0x00
    Reg = 0,0x009F,0x00
    Reg = 0,0x00A0,0x00
    Reg = 0,0x00A1,0x00
    Reg = 0,0x00A2,0x00
    Reg = 0,0x00A3,0x00
    Reg = 0,0x00C0,0x00
    Reg = 0,0x00C1,0x00
    Reg = 0,0x00C2,0xA8
    Reg = 0,0x00C3,0x00
    Reg = 0,0x00C4,0x78
    Reg = 0,0x00C5,0x38
    Reg = 0,0x00C6,0x21
    Reg = 0,0x00C7,0x00
    Reg = 0,0x00C8,0xC0
    Reg = 0,0x00C9,0x00
    Reg = 0,0x00CA,0x00
    Reg = 0,0x00CB,0x00
    Reg = 0,0x00CC,0x00
    Reg = 0,0x00CE,0xFF
    Reg = 0,0x00D0,0x00
    Reg = 0,0x00D1,0x00
    Reg = 0,0x00D2,0x00
    Reg = 0,0x00D3,0x00
    Reg = 0,0x00E0,0x00
    Reg = 0,0x00E1,0x00
    Reg = 0,0x00E2,0xA8
    Reg = 0,0x00E3,0x00
    Reg = 0,0x00E4,0x68
    Reg = 0,0x00E5,0x38
    Reg = 0,0x00E6,0x21
    Reg = 0,0x00E7,0x00
    Reg = 0,0x00F0,0x5F
    Reg = 0,0x00F1,0x55
    Reg = 0,0x00F2,0x42
    Reg = 0,0x00F3,0x39
    Reg = 0,0x00F4,0x34
    Reg = 0,0x00F5,0x39
    Reg = 0,0x00F6,0x00
    Reg = 0,0x00F8,0x00
    Reg = 0,0x00F9,0x00

    Deser register after hang:

    [REGISTERS]
    Device = ALP Nano 1 - DS90UB948, Connector 1
    Comments = "N/A"
    Date = 10/21/2022
    Reg = 0,0x0000,0x58
    Reg = 0,0x0001,0x04
    Reg = 0,0x0002,0x00
    Reg = 0,0x0003,0xF0
    Reg = 0,0x0004,0xFE
    Reg = 0,0x0005,0x1E
    Reg = 0,0x0006,0x00
    Reg = 0,0x0007,0x1C
    Reg = 0,0x0008,0x00
    Reg = 0,0x0009,0x00
    Reg = 0,0x000A,0x00
    Reg = 0,0x000B,0x00
    Reg = 0,0x000C,0x00
    Reg = 0,0x000D,0x00
    Reg = 0,0x000E,0x00
    Reg = 0,0x000F,0x00
    Reg = 0,0x0010,0x00
    Reg = 0,0x0011,0x00
    Reg = 0,0x0012,0x00
    Reg = 0,0x0013,0x00
    Reg = 0,0x0014,0x00
    Reg = 0,0x0015,0x00
    Reg = 0,0x0016,0x00
    Reg = 0,0x0017,0x00
    Reg = 0,0x0018,0x00
    Reg = 0,0x0019,0x01
    Reg = 0,0x001A,0x00
    Reg = 0,0x001B,0x00
    Reg = 0,0x001C,0x3B
    Reg = 0,0x001D,0x13
    Reg = 0,0x001E,0x00
    Reg = 0,0x001F,0x00
    Reg = 0,0x0020,0x00
    Reg = 0,0x0021,0x00
    Reg = 0,0x0022,0x40
    Reg = 0,0x0023,0x20
    Reg = 0,0x0024,0x08
    Reg = 0,0x0025,0x00
    Reg = 0,0x0026,0x83
    Reg = 0,0x0027,0x84
    Reg = 0,0x0028,0x11
    Reg = 0,0x0029,0x00
    Reg = 0,0x002A,0x00
    Reg = 0,0x002B,0x00
    Reg = 0,0x002C,0x00
    Reg = 0,0x002D,0x00
    Reg = 0,0x002E,0x00
    Reg = 0,0x002F,0x00
    Reg = 0,0x0030,0x00
    Reg = 0,0x0031,0x00
    Reg = 0,0x0032,0x90
    Reg = 0,0x0033,0x25
    Reg = 0,0x0034,0x01
    Reg = 0,0x0035,0x00
    Reg = 0,0x0036,0x00
    Reg = 0,0x0037,0x88
    Reg = 0,0x0038,0x00
    Reg = 0,0x0039,0x00
    Reg = 0,0x003A,0x00
    Reg = 0,0x003B,0x00
    Reg = 0,0x003C,0x20
    Reg = 0,0x003D,0xE0
    Reg = 0,0x003E,0x23
    Reg = 0,0x003F,0x00
    Reg = 0,0x0040,0x43
    Reg = 0,0x0041,0x03
    Reg = 0,0x0042,0x03
    Reg = 0,0x0043,0x00
    Reg = 0,0x0044,0x60
    Reg = 0,0x0045,0x88
    Reg = 0,0x0046,0x00
    Reg = 0,0x0047,0x00
    Reg = 0,0x0048,0x0F
    Reg = 0,0x0049,0x00
    Reg = 0,0x004A,0x00
    Reg = 0,0x004B,0x08
    Reg = 0,0x004C,0x00
    Reg = 0,0x004D,0x00
    Reg = 0,0x004E,0x63
    Reg = 0,0x004F,0x00
    Reg = 0,0x0050,0x03
    Reg = 0,0x0051,0x10
    Reg = 0,0x0052,0x00
    Reg = 0,0x0053,0x01
    Reg = 0,0x0054,0x80
    Reg = 0,0x0055,0x00
    Reg = 0,0x0056,0x00
    Reg = 0,0x0057,0x00
    Reg = 0,0x0058,0x00
    Reg = 0,0x0059,0x7F
    Reg = 0,0x005A,0x20
    Reg = 0,0x005B,0x20
    Reg = 0,0x005C,0x00
    Reg = 0,0x005D,0x00
    Reg = 0,0x005E,0x00
    Reg = 0,0x005F,0x00
    Reg = 0,0x0060,0x00
    Reg = 0,0x0061,0x00
    Reg = 0,0x0062,0x00
    Reg = 0,0x0063,0x00
    Reg = 0,0x0064,0x10
    Reg = 0,0x0065,0x00
    Reg = 0,0x0066,0x00
    Reg = 0,0x0067,0x00
    Reg = 0,0x0068,0x00
    Reg = 0,0x0069,0x00
    Reg = 0,0x006E,0x01
    Reg = 0,0x006F,0x00
    Reg = 0,0x0070,0x00
    Reg = 0,0x0071,0x00
    Reg = 0,0x0072,0x00
    Reg = 0,0x0073,0x07
    Reg = 0,0x0074,0x07
    Reg = 0,0x0075,0x08
    Reg = 0,0x0076,0x00
    Reg = 0,0x0077,0x00
    Reg = 0,0x0078,0x00
    Reg = 0,0x0079,0x00
    Reg = 0,0x007A,0x00
    Reg = 0,0x007B,0x5D
    Reg = 0,0x007C,0x02
    Reg = 0,0x0080,0x00
    Reg = 0,0x0081,0x00
    Reg = 0,0x0082,0x00
    Reg = 0,0x0083,0x00
    Reg = 0,0x0084,0x00
    Reg = 0,0x0090,0x00
    Reg = 0,0x0091,0x00
    Reg = 0,0x0092,0x00
    Reg = 0,0x0093,0x00
    Reg = 0,0x0094,0x00
    Reg = 0,0x0098,0x00
    Reg = 0,0x0099,0x00
    Reg = 0,0x009A,0x00
    Reg = 0,0x009B,0x00
    Reg = 0,0x009C,0x00
    Reg = 0,0x009D,0x00
    Reg = 0,0x009E,0x00
    Reg = 0,0x009F,0x00
    Reg = 0,0x00C0,0x00
    Reg = 0,0x00C1,0x00
    Reg = 0,0x00C3,0x00
    Reg = 0,0x00C4,0x00
    Reg = 0,0x00C5,0x00
    Reg = 0,0x00C8,0xC0
    Reg = 0,0x00C9,0x00
    Reg = 0,0x00CA,0x00
    Reg = 0,0x00CB,0x00
    Reg = 0,0x00CC,0x00
    Reg = 0,0x00E0,0x00
    Reg = 0,0x00E1,0x00
    Reg = 0,0x00E2,0x00
    Reg = 0,0x00E3,0x00
    Reg = 0,0x00E8,0x00
    Reg = 0,0x00E9,0x00
    Reg = 0,0x00EA,0x00
    Reg = 0,0x00F0,0x5F
    Reg = 0,0x00F1,0x55
    Reg = 0,0x00F2,0x42
    Reg = 0,0x00F3,0x39
    Reg = 0,0x00F4,0x34
    Reg = 0,0x00F5,0x38
    Reg = 0,0x00F6,0x00
    Reg = 0,0x00F8,0x00
    Reg = 0,0x00F9,0x00

    Thank you.

    Regards,

    Vivek Karna

  • 0 in reply to Vivek Karna
    TI__Expert 4160 points

    Hi Vivek

    I am reviewing your register settings. Nothing seems to be off.

    Can you monitor the INTB_IN pin on the deserializer? That pin on the des should be pulled low by the downstream device (i.e your screen). If this is not being pulled low by the downstream device, then the des is not getting the interrupt.

    Can you also monitor the Lock pin on the deserializer when you are unable to get interrupts?

    Please provide a waveform of these results

    Respectfully,

    William Y.

  • 0 in reply to William Yi
    Prodigy 130 points

    Hello William, 

    Thank you for the reply.

    The problem with the setup is that I don't have any access to the Deser side, because it is closed or embedded in the Touch Screen Panel. So, I can't access the INTB_IN pin of the Deser. Is there any other way using that I can have into the issue?

  • 0 in reply to Vivek Karna
    TI__Expert 4160 points

    Hi Vivek,

    I am still looking into all possibilities. Having access and a waveform of the deserializer would be useful so that we can see if the des is receiving the interrupt signal. 

    I have found a similar E2E related to this issue. They solved this by increasing the BC rate to 20 Mhz.

    Could you try this if it works in you situations? chapter 7.3.9.2 Back Channel Configuration in the 948 datasheet should cover this application.

    Respectfully,

    WIlliam Y.

  • 0 in reply to William Yi
    Prodigy 130 points

    Hello William,

    Thank you for your reply.

    Actually, I tried the 7.3.9.2 paragraph from the Deser datasheet, but this didn't work. I also tried to reset the Deser and again set the registers, but nothing worked, until I switch off (the Deser and attached LED panel) and again turn on the device.

    Is there any other way, I can solve the issue, or do I have to check the INT pin coming from the LCD touchscreen panel? Is there any way through which I can reset the LCD touchscreen panel using Deser registers?

    Thank you.

    Regards,
    Vivek Karna

  • 0 in reply to Vivek Karna
    TI__Expert 4160 points

    Hi Vivek,

    Thank you for the update

    From my understanding now

    1) power cycling both the Deserializer and LCD panel solves the issue

    2) issuing a hard reset on the deserializer is not solving the issue

    My suggestions:

    1) The finding suggests that there may be a problem in the way that the deserializer is receiving the interrupt. Checking the INT pin on the des will help to will help to verify that the LCD display/driver is sending the interrupt.

    Vivek Karna said:
    Is there any way through which I can reset the LCD touchscreen panel using Deser registers

    2) Yes, you are able to reset the LCD touchscreen by addressing the device with I2C using its device alias to enable any reset registers on the LCD display. If your system is using GPIO pins connected to the LCD reset pin, you are able to issue resets using GPIO passthrough as well.

    Respectfully,

    William Y.