bugfix for boards with a timer 4 but no channel D
compilation failed for Mega because the COM4D1 and OCR4D registers are defined for 32U4 but not for Mega
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@ -230,7 +230,7 @@ void analogWrite(uint8_t pin, int val)
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break;
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#endif
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#if defined(TCCR4C)
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#if defined(TCCR4C) && defined(COM4D1)
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case TIMER4D:
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// connect pwm to pin on timer 4, channel D
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sbi(TCCR4C, COM4D1);
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