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Prevent current step-down going negative

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Addressing #11348
This commit is contained in:
Scott Lahteine 2018-11-05 02:48:43 -06:00
parent 427bc64ba1
commit b779b42ffd
1 changed files with 1 additions and 1 deletions
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2
Marlin/src/feature/tmc_util.cpp
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@ -153,7 +153,7 @@
#if CURRENT_STEP_DOWN > 0 #if CURRENT_STEP_DOWN > 0
// Decrease current if is_otpw is true and driver is enabled and there's been more than 4 warnings // Decrease current if is_otpw is true and driver is enabled and there's been more than 4 warnings
if (data.is_otpw && st.isEnabled() && st.otpw_count > 4) { if (data.is_otpw && st.isEnabled() && st.otpw_count > 4) {
st.rms_current(st.getMilliamps() - (CURRENT_STEP_DOWN)); st.rms_current(MAX(int16_t(st.getMilliamps() - (CURRENT_STEP_DOWN)), 0));
#if ENABLED(REPORT_CURRENT_CHANGE) #if ENABLED(REPORT_CURRENT_CHANGE)
st.printLabel(); st.printLabel();
SERIAL_ECHOLNPAIR(" current decreased to ", st.getMilliamps()); SERIAL_ECHOLNPAIR(" current decreased to ", st.getMilliamps());