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stepper: Clarify comment on timer-counter configuration

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This commit is contained in:
Ben Gamari 2012-03-07 17:58:35 -05:00
parent 6d7e6a11fc
commit 96509494f0
1 changed files with 7 additions and 1 deletions
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8
Marlin/stepper.cpp
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@ -740,7 +740,13 @@ void st_init()
// output mode = 00 (disconnected)
TCCR1A &= ~(3<<COM1A0);
TCCR1A &= ~(3<<COM1B0);
TCCR1B = (TCCR1B & ~(0x07<<CS10)) | (2<<CS10); // 2MHz timer
// Set the timer pre-scaler
// Generally we use a divider of 8, resulting in a 2MHz timer
// frequency on a 16MHz MCU. If you are going to change this, be
// sure to regenerate speed_lookuptable.h with
// create_speed_lookuptable.py
TCCR1B = (TCCR1B & ~(0x07<<CS10)) | (2<<CS10);
OCR1A = 0x4000;
TCNT1 = 0;