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Additional comments for Temperature::isr

Scott Lahteine 8 yıl önce
ebeveyn
işleme
e9bfca5870
1 değiştirilmiş dosya ile 8 ekleme ve 2 silme
  1. 8
    2
      Marlin/temperature.cpp

+ 8
- 2
Marlin/temperature.cpp Dosyayı Görüntüle

@@ -1399,7 +1399,12 @@ void Temperature::set_current_temp_raw() {
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 }
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 /**
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- * Timer 0 is shared with millies
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+ * Timer 0 is shared with millies so don't change the prescaler.
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+ *
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+ * This ISR uses the compare method so it runs at the base
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+ * frequency (16 MHz / 256 = 62500 Hz), but at the TCNT0 set
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+ * in OCR0B above (128 or halfway between OVFs).
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+ *
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  *  - Manage PWM to all the heaters and fan
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  *  - Update the raw temperature values
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  *  - Check new temperature values for MIN/MAX errors
@@ -1515,6 +1520,7 @@ void Temperature::isr() {
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       #endif
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     #endif
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+    // 488.28 Hz (or 1:976.56, 2:1953.12, 3:3906.25, 4:7812.5, 5:7812.5 6:15625, 6:15625 7:31250)
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     pwm_count += _BV(SOFT_PWM_SCALE);
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     pwm_count &= 0x7f;
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@@ -1523,7 +1529,7 @@ void Temperature::isr() {
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     /**
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      * SLOW PWM HEATERS
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      *
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-     * for heaters drived by relay
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+     * For relay-driven heaters
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      */
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     #ifndef MIN_STATE_TIME
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       #define MIN_STATE_TIME 16 // MIN_STATE_TIME * 65.5 = time in milliseconds

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