diff options
Diffstat (limited to 'quantum')
| -rw-r--r-- | quantum/quantum.c | 170 |
1 files changed, 141 insertions, 29 deletions
diff --git a/quantum/quantum.c b/quantum/quantum.c index da48337e4b..9a44bd012a 100644 --- a/quantum/quantum.c +++ b/quantum/quantum.c @@ -1030,35 +1030,147 @@ void matrix_scan_quantum() { } #if defined(BACKLIGHT_ENABLE) && defined(BACKLIGHT_PIN) -static const uint8_t backlight_pin = BACKLIGHT_PIN; - -// depending on the pin, we use a different output compare unit -#if BACKLIGHT_PIN == B7 -# define TCCRxA TCCR1A -# define TCCRxB TCCR1B -# define COMxx1 COM1C1 -# define OCRxx OCR1C -# define ICRx ICR1 -#elif BACKLIGHT_PIN == B6 -# define TCCRxA TCCR1A -# define TCCRxB TCCR1B -# define COMxx1 COM1B1 -# define OCRxx OCR1B -# define ICRx ICR1 -#elif BACKLIGHT_PIN == B5 -# define TCCRxA TCCR1A -# define TCCRxB TCCR1B -# define COMxx1 COM1A1 -# define OCRxx OCR1A -# define ICRx ICR1 -#elif BACKLIGHT_PIN == C6 -# define TCCRxA TCCR3A -# define TCCRxB TCCR3B -# define COMxx1 COM1A1 -# define OCRxx OCR3A -# define ICRx ICR3 +// This logic is a bit complex, we support 3 setups: +// +// 1. Hardware PWM when backlight is wired to a PWM pin. +// Depending on this pin, we use a different output compare unit. +// 2. Software PWM with hardware timers, but the used timer +// depends on the Audio setup (Audio wins over Backlight). +// 3. Full software PWM, driven by the matrix scan, if both timers are used by Audio. + +#if (defined(__AVR_AT90USB646__) || defined(__AVR_AT90USB647__) \ + || defined(__AVR_AT90USB1286__) || defined(__AVR_AT90USB1287__) \ + || defined(__AVR_ATmega16U4__) || defined(__AVR_ATmega32U4__)) \ + && (BACKLIGHT_PIN == B5 || BACKLIGHT_PIN == B6 || BACKLIGHT_PIN == B7) + #define HARDWARE_PWM + #define ICRx ICR1 + #define TCCRxA TCCR1A + #define TCCRxB TCCR1B + #define TIMERx_OVF_vect TIMER1_OVF_vect + #define TIMSKx TIMSK1 + #define TOIEx TOIE1 + + #if BACKLIGHT_PIN == B5 + #define COMxx1 COM1A1 + #define OCRxx OCR1A + #elif BACKLIGHT_PIN == B6 + #define COMxx1 COM1B1 + #define OCRxx OCR1B + #elif BACKLIGHT_PIN == B7 + #define COMxx1 COM1C1 + #define OCRxx OCR1C + #endif +#elif (defined(__AVR_AT90USB646__) || defined(__AVR_AT90USB647__) \ + || defined(__AVR_AT90USB1286__) || defined(__AVR_AT90USB1287__) \ + || defined(__AVR_ATmega16U4__) || defined(__AVR_ATmega32U4__)) \ + && (BACKLIGHT_PIN == C4 || BACKLIGHT_PIN == C5 || BACKLIGHT_PIN == C6) + #define HARDWARE_PWM + #define ICRx ICR3 + #define TCCRxA TCCR3A + #define TCCRxB TCCR3B + #define TIMERx_OVF_vect TIMER3_OVF_vect + #define TIMSKx TIMSK3 + #define TOIEx TOIE3 + + #if BACKLIGHT_PIN == C4 + #if (defined(__AVR_ATmega16U4__) || defined(__AVR_ATmega32U4__)) + #error This MCU has no C4 pin! + #else + #define COMxx1 COM3C1 + #define OCRxx OCR3C + #endif + #elif BACKLIGHT_PIN == C5 + #if (defined(__AVR_ATmega16U4__) || defined(__AVR_ATmega32U4__)) + #error This MCU has no C5 pin! + #else + #define COMxx1 COM3B1 + #define OCRxx OCR3B + #endif + #elif BACKLIGHT_PIN == C6 + #define COMxx1 COM3A1 + #define OCRxx OCR3A + #endif +#elif (defined(__AVR_ATmega16U2__) || defined(__AVR_ATmega32U2__)) \ + && (BACKLIGHT_PIN == B7 || BACKLIGHT_PIN == C5 || BACKLIGHT_PIN == C6) + #define HARDWARE_PWM + #define ICRx ICR1 + #define TCCRxA TCCR1A + #define TCCRxB TCCR1B + #define TIMERx_OVF_vect TIMER1_OVF_vect + #define TIMSKx TIMSK1 + #define TOIEx TOIE1 + + #if BACKLIGHT_PIN == B7 + #define COMxx1 COM1C1 + #define OCRxx OCR1C + #elif BACKLIGHT_PIN == C5 + #define COMxx1 COM1B1 + #define OCRxx OCR1B + #elif BACKLIGHT_PIN == C6 + #define COMxx1 COM1A1 + #define OCRxx OCR1A + #endif +#elif defined(__AVR_ATmega32A__) \ + && (BACKLIGHT_PIN == D4 || BACKLIGHT_PIN == D5) + #define HARDWARE_PWM + #define ICRx ICR1 + #define TCCRxA TCCR1A + #define TCCRxB TCCR1B + #define TIMERx_OVF_vect TIMER1_OVF_vect + #define TIMSKx TIMSK + #define TOIEx TOIE1 + + #if BACKLIGHT_PIN == D4 + #define COMxx1 COM1B1 + #define OCRxx OCR1B + #elif BACKLIGHT_PIN == D5 + #define COMxx1 COM1A1 + #define OCRxx OCR1A + #endif #else -# define NO_HARDWARE_PWM + #if !defined(BACKLIGHT_CUSTOM_DRIVER) + #if !defined(B5_AUDIO) && !defined(B6_AUDIO) && !defined(B7_AUDIO) + // Timer 1 is not in use by Audio feature, Backlight can use it + #pragma message "Using hardware timer 1 with software PWM" + #define HARDWARE_PWM + #define BACKLIGHT_PWM_TIMER + #define ICRx ICR1 + #define TCCRxA TCCR1A + #define TCCRxB TCCR1B + #define TIMERx_COMPA_vect TIMER1_COMPA_vect + #define TIMERx_OVF_vect TIMER1_OVF_vect + #if defined(__AVR_ATmega32A__) // This MCU has only one TIMSK register + #define TIMSKx TIMSK + #else + #define TIMSKx TIMSK1 + #endif + #define TOIEx TOIE1 + + #define OCIExA OCIE1A + #define OCRxx OCR1A + #elif !defined(C6_AUDIO) && !defined(C5_AUDIO) && !defined(C4_AUDIO) + #pragma message "Using hardware timer 3 with software PWM" + // Timer 3 is not in use by Audio feature, Backlight can use it + #define HARDWARE_PWM + #define BACKLIGHT_PWM_TIMER + #define ICRx ICR1 + #define TCCRxA TCCR3A + #define TCCRxB TCCR3B + #define TIMERx_COMPA_vect TIMER3_COMPA_vect + #define TIMERx_OVF_vect TIMER3_OVF_vect + #define TIMSKx TIMSK3 + #define TOIEx TOIE3 + + #define OCIExA OCIE3A + #define OCRxx OCR3A + #else + #pragma message "Audio in use - using pure software PWM" + #define NO_HARDWARE_PWM + #endif + #else + #pragma message "Custom driver defined - using pure software PWM" + #define NO_HARDWARE_PWM + #endif #endif #ifndef BACKLIGHT_ON_STATE @@ -1137,7 +1249,7 @@ static uint16_t cie_lightness(uint16_t v) { // range for val is [0..TIMER_TOP]. PWM pin is high while the timer count is below val. static inline void set_pwm(uint16_t val) { - OCRxx = val; + OCRxx = val; } #ifndef BACKLIGHT_CUSTOM_DRIVER |