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Altera_Forum's avatar
Altera_Forum
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14 years ago

Terasic Multi-Touch LCD Help

Hey guys,

I am working on a student project that uses the DE2-70 and the Terasic multi-touch LCD module. I am coding in Verilog on Quartus and am designing a touchscreen music synthesizer. Terasic provides an IP touch controller that is used to read in touches, gestures, and locations. Unfortunately, I have not been able to get a touch response from the unit. Nor have I been able to figure out how to output to the LCD screen. I also haven't been able to get Terasic's 2 demos up and running. I would greatly appreciate any help in setting the MTL module up or reference to additional documentation.

Terasic's IP touch controller that has the following inputs and outputs:

iCLK: Input- Connect to 50MHz Clock

iRSTN: Input- Connect to system reset signal

iTRIG: Input- Connect to Interrupt Pin of Touch IC

oREADY: Output- Rising Trigger when following six output data is valid

oREG_X1: Output- 10-bits X coordinate of first touch point

oREG_Y: Output- 9-bits Y coordinate of first touch point

oREG_X2: Output- 10-bits X coordinate of second touch point

oREG_Y2: Output- 9-bits Y coordinate of second touch point

oREG_TOUCH_COUNT: Output- 2-bits touch count. Valid value is 0, 1, or 2.

oREG_GESTURE: Output- 8-bits gesture ID (See Table 3-4)

I2C_SCLK: Output- Connect to I2C Clock Pin of Touch IC

I2C_SDAT: Inout- Connect to I2C Data Pin of Touch IC

According to the manual, iTRIG, I2C_SCLK, and IC2_SDAT pins should be connected to the MTL_TOUCH_INT_n, MTL_TOUCH_I2C_SCL, and MTL_TOUCH_I2C_DAT signals in the 2x20 GPIO header respectively. When oREADY rises, it means there is touch activity, and associated information is given in the oREG_X1, oREG_Y1, oREG_X2, oREG_Y2, oREG_TOUCH_COUNT, and oREG_GESTURE pins.

They also give the mapping for the GPIO ports on the DE2 which I converted to GPIO ports of the DE2-70.

Note* I also have access to the Altera DE2 board, but would prefer to use the DE2-70

Thanks!

4 Replies

  • Altera_Forum's avatar
    Altera_Forum
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    14 years ago

    *Update*

    I received an email back from Terasic's tech support team. Unfortunately, they did not provide any help. They suggested looking over the demo code and trying out the demos. As I said earlier, I have tried to use the demos but they do not currently work. I'm really at a lose for how to proceed forward with my project. Any help would be greatly appreciated.

    Thanks!
  • Altera_Forum's avatar
    Altera_Forum
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    14 years ago

    Hi Flartiz,

    I'll have our support team give you more guidance on the subject and give you a direct demonstration for the DE2-70.
  • Altera_Forum's avatar
    Altera_Forum
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    14 years ago

    Thanks ayhoung!

    I am now receiving touch inputs correctly on the DE2 board. It turns out that iTRIG has negative polarity. It means a lot to know that you and your support team actively read the forums and help customers. =) I look forward to learning from your direct demonstration and would still appreciate any help with drawing shapes on the LCD screen.

    Thanks!
  • Altera_Forum's avatar
    Altera_Forum
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    13 years ago

    flaritz, did you figure out how to draw shapes on the LCD module. I am using the same module for my project on a DE2 board. Did you find any useful resources for using the module?