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ADS7843: calibration in ads7843

Kanchan
Expert 1445 points
Part Number: ADS7843
Other Parts Discussed in Thread: TSC2046E

i am using ads7843 along with ssd1289 display.

display is working properly and i have written 3-point and 5-point calibration for the touch screen but still not getting the desired output of the touchscreen. the output is the repeatative.

whereve i touch on the screen it shows the different coordinates at least i should get the same constant x y coordinates on the same place but if touch the same pixel i get the different x y cordinates .

now on the verge of giving up please help me

  • 0
    TI__Guru 64255 points

    Hi Kanchan,

    So to confirm, you're receiving random outputs from the ADS7843, even when holding your finger/pen in a constant location?  Could you share a capture of the SPI communication while this is happening?

    Also, you may want to consider a slightly more modern SPI touchscreen controller such as the TSC2046E.