Updated RAMPS pins for TMC2209 UART mode #230
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In order for the UART to work, the RX pin must have an interrupt. INT and PCINT interrupts are supported.
yarikpetrenko
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In order for the UART to work, the RX pin must have an interrupt. INT and PCINT interrupts are supported.
For some reason D14 and D15 don't work (they should but don't), used D11 and D6 pins from the "Servos" pins to compensate. I2C is also used by the digital layer, so we should not use pins D20 and D21.