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There was a typo, so the attempted configuration proably didn't do
what it should have done. I think it left the pin floating, and
could cause the LCD problems issue-1230.
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It turns out that the ChibiOS K20 SPI driver doesn't handle the
chip select, so it needs to be done manually. Acquiring the bus is
not enough since the pin was in the wrong mode. This is now fixed.
Also increase the frequency of the SPI from around 200kHz to nearly
20 Mhz.
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The SPI bus is now selected and deselected before each set of commands.
Also speed up things by buffering many commands into a single batch.
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There are linker errors due to missing led funcitonality though
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Only the EZ default keymaps compiles at the moment though.
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