Jack,

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Nope, it has its own processor that takes care of the refresh. With the downloadable software you define touch areas, display areas etc. This is downloaded to the onboard processor via either serial of much faster via an SD card. The data defining characteristics and page numbers once down loaded are populated via the serial bus. The STM32 discovery boards availabl for less than $20 contain the BitX program (you can use the same IDE as used for the Arduino once the libraries are downloaded).

It took me less than 20 minutes to define 4 pages to control all the functions. Thanks to your tutelage I was able to simply modify the portions of the BitX program I used with a 20X4 display. With the touch screen I can enter the frequency directly and pass it to the STM32 processor. Works well with the Arduino Mega as well using TX2/RX2.

The software from the screen vendor allows you to prepare the files, simulate the screen and then when you happy send it to the SD card for installation. Once you get familiar with the simulator you can create an application in less than an hour.

Once data has been passed to the screen you can disconnect the Arduiano/STM32 and the display continues on displaying the last data received in the fields defined by the SD card info.

Screen sizes up to 7 inch are available albeit a bit pricey. I am using the 3.5 inch.

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v/r

Fred W4JLE

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