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I am having a problem configuring my ADC in the way that is required. The range of my ADC is +/-6. We need to be configured that way; when the input voltage at -6V, then my ADC hex value should be 0x0000. When the voltage is 0V, then the LCD should display the half of my ADC value in hex, and my maximum ADC value which is 0xFFFF is equal to my maximum voltage which is +6V.
Please check the attachment to observe my result. It's working, but the problem with it, the Voltage -0.001V is equal to 0xFFFF, but we need it to be the half of whatever the ADC value is, and my 0x0000 should be -6v.