2.8" TFT Shield very slow on Arch Max

The display works (very) slow on this Arch Max. It takes at least 4 seconds to clear the screen. On the Arch Pro, is is maybe 0.1 Sec. Erik Olieman was of great help trying to find the root cause and pointed out that STM introduced a bug in the new mbed library, where the SPI frequency can't be adjusted for the Arch Max and is 330kHz only. Using this older mbed source fixes the issue: https://developer.mbed.org/users/Sissors/code/mbed-src2/ Many thanks, Erik!!! Update, the seems to be fixed in the current mbed library.

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