adjusted BLF Lantern (Sofirn LT1) tint ramping power correction factor to match production units

(also made the factor configurable per build target)

2 files changed, 8 insertions, 1 deletions

diff --git a/spaghetti-monster/anduril/cfg-blf-lantern.h b/spaghetti-monster/anduril/cfg-blf-lantern.h
index bdcd893..35f25f1 100644
--- a/spaghetti-monster/anduril/cfg-blf-lantern.h
+++ b/spaghetti-monster/anduril/cfg-blf-lantern.h
@@ -27,6 +27,10 @@
 // (one channel for warm emitters, one channel for cold)
 // so enable a special ramping mode which changes tint instead of brightness
 #define USE_TINT_RAMPING
+// how much to increase total brightness at middle tint
+// (0 = 100% brightness, 64 = 200% brightness)
+//#define TINT_RAMPING_CORRECTION 26  // prototype, 140%
+#define TINT_RAMPING_CORRECTION 6  // production model, 109%
 
 #ifdef RAMP_LENGTH
 #undef RAMP_LENGTH
diff --git a/spaghetti-monster/fsm-ramping.c b/spaghetti-monster/fsm-ramping.c
index 37c8073..8515885 100644
--- a/spaghetti-monster/fsm-ramping.c
+++ b/spaghetti-monster/fsm-ramping.c
@@ -72,6 +72,9 @@ void set_level(uint8_t level) {
         level --;
 
         #ifdef USE_TINT_RAMPING
+        #ifndef TINT_RAMPING_CORRECTION
+        #define TINT_RAMPING_CORRECTION 26  // 140% brightness at middle tint
+        #endif
         // calculate actual PWM levels based on a single-channel ramp
         // and a global tint value
         uint8_t brightness = pgm_read_byte(pwm1_levels + level);
@@ -96,7 +99,7 @@ void set_level(uint8_t level) {
         // correction is only necessary when PWM is fast
         if (level > HALFSPEED_LEVEL) {
             base_PWM = brightness
-                     + ((((uint16_t)brightness) * 26 / 64) * triangle_wave(mytint) / 255);
+                     + ((((uint16_t)brightness) * TINT_RAMPING_CORRECTION / 64) * triangle_wave(mytint) / 255);
         }
 
         cool_PWM = (((uint16_t)mytint * (uint16_t)base_PWM) + 127) / 255;