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In the word of electronics “Touch” is widely known in the context of a user-input device similar to a mouse or keyboard and brought into a whole new context with the advent of the Apple iPhone.

1- gpio gives 3.3v and ground but its adc measuring voltage is from (0.7 to 1.15 for x axis) and (0.55 to 2.8 for y axis)

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Its been stated that touch screens have been around since the 1960s but back then they were very simple and no where near the number of different types today offers.

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Pick one based on your requirements on speed, precision, cost, etc, read the documentation, get samples, implement the interface for a prototype, evaluate... the usual life cycle of any project.

i have written a driver code to run 4 wire resistive touch panel. I use only 1 adc and change its adc channel during runtime. Like i set X+ and Y+ as output high by default and X- and Y- set as low by default and set X- and y- pull down to make ADC read 0 when not pressed. Basically, I have few functions that change the configuration such as X+ and X- to output, set Y+ to analog and Y- to input to set Y+ and Y- as an output, set X+ to analog and X- to input. read x voltage in previous case and read y voltage in later case. ADC is only one to switch the configuration during runtime and its resolution is 16 bit with 810.5 cycles sampling time.

Resistive touch screens do not require a controller. A 4-wire resistive touch screen needs 2 ADC and 2 digital I/O pins, a 5-wire 1 ADC and 4 GPIOs. Any STM32 with enough pins can handle that.

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Any STM32 can do that, if there are 2 ADC and 2 additional GPIO pins free. Of course I will not hold you back if you want to use an external controller for something that the MCU can do on its own.

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ATM machines, industrial equipment, vending machine, video kiosks, gaming machines, car navigation devices, etc. are all just some of the applications for touch panels. The current technology of choice for touch panels is projected capacitive and is seeing more uses in medical related product applications, even replacing components like trackballs, one because there are no moving parts plus ease of cleaning.

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As noted above the Apple iPhone is a good example of one application of a touch panel, but there are many more uses. The Apple iPhone as well as their iPad product use projected capacitive technology touch panels, but there are many more resistive touch panels in use in products today. When you sign your name after a credit card transaction you’re more apt to be using a resistive touch panel.

Touchscreen controllers tend to be pretty autonomous chips, usually connected through I2C, but otherwise entirely independent from the host mcu. So there's nothing like "this is the best touchscreen controller for STM32H7".