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Rescale both ChibiOS and AVR backlighting.

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Nick Brassel 2020-09-07 11:05:50 +10:00 • committed by James Young
parent c4ecae1d77
commit f22a61e7e9
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GPG key ID: 8E1085BF6FCFBD74
3 changed files with 33 additions and 12 deletions
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14
quantum/backlight/backlight_avr.c
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@ -3,6 +3,11 @@
#include "backlight_driver_common.h"
#include "debug.h"
// Maximum duty cycle limit
#ifndef BACKLIGHT_LIMIT_VAL
# define BACKLIGHT_LIMIT_VAL 255
#endif
// This logic is a bit complex, we support 3 setups:
//
// 1. Hardware PWM when backlight is wired to a PWM pin.
@ -240,6 +245,11 @@ static uint16_t cie_lightness(uint16_t v) {
}
}
// rescale the supplied backlight value to be in terms of the value limit
static uint32_t rescale_limit_val(uint32_t val) {
return (val * (BACKLIGHT_LIMIT_VAL + 1)) / 256;
}
// 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; }
@ -269,7 +279,7 @@ void backlight_set(uint8_t level) {
#endif
}
// Set the brightness
set_pwm(cie_lightness(TIMER_TOP * (uint32_t)level / BACKLIGHT_LEVELS));
set_pwm(cie_lightness(rescale_limit_val(TIMER_TOP * (uint32_t)level / BACKLIGHT_LEVELS)));
}
void backlight_task(void) {}
@ -375,7 +385,7 @@ ISR(TIMERx_OVF_vect)
breathing_interrupt_disable();
}
set_pwm(cie_lightness(scale_backlight((uint16_t)pgm_read_byte(&breathing_table[index]) * 0x0101U)));
set_pwm(cie_lightness(rescale_limit_val(scale_backlight((uint16_t)pgm_read_byte(&breathing_table[index]) * 0x0101U))));
}
#endif // BACKLIGHT_BREATHING