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-rw-r--r--quantum/backlight/backlight_avr.c8
1 files changed, 6 insertions, 2 deletions
diff --git a/quantum/backlight/backlight_avr.c b/quantum/backlight/backlight_avr.c
index f3a0252270..474e0a86f5 100644
--- a/quantum/backlight/backlight_avr.c
+++ b/quantum/backlight/backlight_avr.c
@@ -405,14 +405,18 @@ ISR(TIMERx_OVF_vect)
uint16_t interval = (uint16_t)get_breathing_period() * breathing_ISR_frequency / BREATHING_STEPS;
// resetting after one period to prevent ugly reset at overflow.
breathing_counter = (breathing_counter + 1) % (get_breathing_period() * breathing_ISR_frequency);
- uint8_t index = breathing_counter / interval % BREATHING_STEPS;
+ uint8_t index = breathing_counter / interval;
+ // limit index to max step value
+ if (index >= BREATHING_STEPS) {
+ index = BREATHING_STEPS - 1;
+ }
if (((breathing_halt == BREATHING_HALT_ON) && (index == BREATHING_STEPS / 2)) || ((breathing_halt == BREATHING_HALT_OFF) && (index == BREATHING_STEPS - 1))) {
breathing_interrupt_disable();
}
// Set PWM to a brightnessvalue scaled to the configured resolution
- set_pwm(cie_lightness(rescale_limit_val(scale_backlight((uint16_t)pgm_read_byte(&breathing_table[index]) * ICRx / 255))));
+ set_pwm(cie_lightness(rescale_limit_val(scale_backlight((uint32_t)pgm_read_byte(&breathing_table[index]) * ICRx / 255))));
}
#endif // BACKLIGHT_BREATHING