Add support for 328P hardware backlight on B1/B2 (#6776)
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@ -32,16 +32,18 @@ This feature is distinct from both the [RGB underglow](feature_rgblight.md) and
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Hardware PWM is supported according to the following table:
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|Backlight Pin|AT90USB64/128|ATmega16/32U4|ATmega16/32U2|ATmega32A|
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|-------------|-------------|-------------|-------------|---------|
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|`B5` |Timer 1 |Timer 1 | | |
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|`B6` |Timer 1 |Timer 1 | | |
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|`B7` |Timer 1 |Timer 1 |Timer 1 | |
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|`C4` |Timer 3 | | | |
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|`C5` |Timer 3 | |Timer 1 | |
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|`C6` |Timer 3 |Timer 3 |Timer 1 | |
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|`D4` | | | |Timer 1 |
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|`D5` | | | |Timer 1 |
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|Backlight Pin|AT90USB64/128|ATmega16/32U4|ATmega16/32U2|ATmega32A|ATmega328P|
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|-------------|-------------|-------------|-------------|---------|----------|
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|`B1` | | | | |Timer 1 |
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|`B2` | | | | |Timer 1 |
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|`B5` |Timer 1 |Timer 1 | | | |
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|`B6` |Timer 1 |Timer 1 | | | |
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|`B7` |Timer 1 |Timer 1 |Timer 1 | | |
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|`C4` |Timer 3 | | | | |
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|`C5` |Timer 3 | |Timer 1 | | |
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|`C6` |Timer 3 |Timer 3 |Timer 1 | | |
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|`D4` | | | |Timer 1 | |
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|`D5` | | | |Timer 1 | |
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All other pins will use software PWM. If the [Audio](feature_audio.md) feature is disabled or only using one timer, the backlight PWM can be triggered by a hardware timer:
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@ -1104,6 +1104,22 @@ void matrix_scan_quantum() {
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# define COMxx1 COM1A1
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# define OCRxx OCR1A
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# endif
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# elif defined(__AVR_ATmega328P__) && (BACKLIGHT_PIN == B1 || BACKLIGHT_PIN == B2)
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# define HARDWARE_PWM
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# define ICRx ICR1
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# define TCCRxA TCCR1A
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# define TCCRxB TCCR1B
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# define TIMERx_OVF_vect TIMER1_OVF_vect
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# define TIMSKx TIMSK1
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# define TOIEx TOIE1
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# if BACKLIGHT_PIN == B1
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# define COMxx1 COM1A1
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# define OCRxx OCR1A
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# elif BACKLIGHT_PIN == B2
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# define COMxx1 COM1B1
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# define OCRxx OCR1B
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# endif
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# else
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# if !defined(BACKLIGHT_CUSTOM_DRIVER)
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# if !defined(B5_AUDIO) && !defined(B6_AUDIO) && !defined(B7_AUDIO)
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