ManuelW/grbl-LPC-CoreXY
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Reset the overflow flag to stop a queued overflow interrupt from resetting the step pulse right after sei() is called

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jvangrin 2011-07-05 16:50:40 -05:00
parent d4f3fdd4bb
commit 926d74fcb7
1 changed files with 3 additions and 1 deletions
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4
stepper.c
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@ -135,8 +135,10 @@ SIGNAL(TIMER1_COMPA_vect)
// Then pulse the stepping pins
STEPPING_PORT = (STEPPING_PORT & ~STEP_MASK) | out_bits;
// Reset step pulse reset timer so that The Stepper Port Reset Interrupt can reset the signal after
// exactly settings.pulse_microseconds microseconds.
// exactly settings.pulse_microseconds microseconds. Clear the overflow flag to stop a queued
// interrupt from resetting the step pulse too soon.
TCNT2 = -(((settings.pulse_microseconds-2)*TICKS_PER_MICROSECOND)/8);
TIFR2 |= (1<<TOV2);
busy = TRUE;
sei(); // Re enable interrupts (normally disabled while inside an interrupt handler)