diff options
Diffstat (limited to 'spaghetti-monster/fsm-ramping.c')
| -rw-r--r-- | spaghetti-monster/fsm-ramping.c | 27 |
1 files changed, 25 insertions, 2 deletions
diff --git a/spaghetti-monster/fsm-ramping.c b/spaghetti-monster/fsm-ramping.c index ee816dd..082f8c9 100644 --- a/spaghetti-monster/fsm-ramping.c +++ b/spaghetti-monster/fsm-ramping.c @@ -65,8 +65,31 @@ void set_level(uint8_t level) { // and a global tint value uint8_t brightness = pgm_read_byte(pwm1_levels + level); uint8_t warm_PWM, cool_PWM; - cool_PWM = (((uint16_t)tint * (uint16_t)brightness) + 127) / 255; - warm_PWM = brightness - cool_PWM; + + // auto-tint modes + uint8_t mytint; + #if 1 + // perceptual by ramp level + if (tint == 0) { mytint = 255 * (uint16_t)level / RAMP_SIZE; } + else if (tint == 255) { mytint = 255 - (255 * (uint16_t)level / RAMP_SIZE); } + #else + // linear with power level + //if (tint == 0) { mytint = brightness; } + //else if (tint == 255) { mytint = 255 - brightness; } + #endif + // stretch 1-254 to fit 0-255 range (hits every value except 98 and 198) + else { mytint = (tint * 100 / 99) - 1; } + + // middle tints sag, so correct for that effect + uint16_t base_PWM = brightness; + // correction is only necessary when PWM is fast + if (level > HALFSPEED_LEVEL) { + base_PWM = brightness + + ((((uint16_t)brightness) * 26 / 64) * triangle_wave(mytint) / 255); + } + + cool_PWM = (((uint16_t)mytint * (uint16_t)base_PWM) + 127) / 255; + warm_PWM = base_PWM - cool_PWM; PWM1_LVL = warm_PWM; PWM2_LVL = cool_PWM; |