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/*  Interrupted at a pin change on zero-cross pin
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/*  Interrupted at a pin change on zero-cross pin
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    The zero-cross pin will go high just before the real zero-cross and
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    The zero-cross pin will go high just before the real zero-cross and
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    low just after the real zero-cross. The time difference is measured
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    low just after the real zero-cross. The time difference is measured
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    and adjusted for. */
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    and adjusted for. */
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void act_dimmer230_pcint_callback(uint8_t id) //ISR (act_dimmer230_ZC_PCINT_vect)
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void act_dimmer230_pcint_callback(uint8_t id, uint8_t status) //ISR (act_dimmer230_ZC_PCINT_vect)
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{
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{
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    /* only execute if zerocross pin is low (after real zerocross).
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    /* only execute if zerocross pin is low (after real zerocross).
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    Calculate the diff from real zero-cross.
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    Calculate the diff from real zero-cross.
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    */
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    */
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    if (!gpio_get_state(act_dimmer230_ZC_IO))
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    if (!gpio_get_state(act_dimmer230_ZC_IO))