Move XON/XOFF handler from Uart to UartChannel #1233
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This fixes a hang that can happen if, for example, a TMC2209 sends 0x11 which is XON, thus triggering software flow control. One way to trigger the failure is to issue $H twice on an Fysetc E4 controller.
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This fixes a hang that can happen if, for example, a TMC2209 sends 0x11 which is XON, thus triggering software flow control. One way to trigger the failure is to issue $H twice on an Fysetc E4 controller.