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Reduce default TMC baud rate to 57600 when using Software Serial #16930

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Feb 23, 2020
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Reduce default TMC baud rate to 57600 when using Software Serial #16930

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11 changes: 10 additions & 1 deletion Marlin/src/module/stepper/trinamic.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -117,7 +117,16 @@ enum StealthIndex : uint8_t { STEALTH_AXIS_XY, STEALTH_AXIS_Z, STEALTH_AXIS_E };
#endif

#ifndef TMC_BAUD_RATE
#define TMC_BAUD_RATE 115200
#if HAS_TMC_SW_SERIAL
// Reduce baud rate for boards not already overriding TMC_BAUD_RATE for software serial.
// Testing has shown that 115200 is not 100% reliable on AVR platforms, occasionally
// failing to read status properly. 32-bit platforms typically define an even lower
// TMC_BAUD_RATE, due to differences in how SoftwareSerial libraries work on different
// platforms.
#define TMC_BAUD_RATE 57600
#else
#define TMC_BAUD_RATE 115200
#endif
#endif

#if HAS_DRIVER(TMC2130)
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