1 files changed, 51 insertions, 0 deletions
diff --git a/hwdef-noctigon-kr4.c b/hwdef-noctigon-kr4.c
new file mode 100644
index 0000000..bcb98fc
--- /dev/null
+++ b/hwdef-noctigon-kr4.c
@@ -0,0 +1,51 @@
+// Noctigon KR4 PWM helper functions
+// Copyright (C) 2020-2023 Selene ToyKeeper
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#pragma once
+
+#include "chan-rgbaux.c"
+
+// single set of LEDs with 2 stacked power channels, linear + DD FET
+void set_level_main(uint8_t level) {
+    if (level == 0) {
+        CH1_PWM = 0;
+        CH2_PWM = 0;
+        PWM_CNT = 0;  // reset phase
+        CH1_ENABLE_PORT &= ~(1 << CH1_ENABLE_PIN);  // disable opamp
+        return;
+    }
+
+    CH1_ENABLE_PORT |= (1 << CH1_ENABLE_PIN);  // enable opamp
+
+    level --;  // PWM array index = level - 1
+    PWM_DATATYPE ch1_pwm = PWM_GET(pwm1_levels, level);
+    PWM_DATATYPE ch2_pwm = PWM_GET(pwm2_levels, level);
+    // pulse frequency modulation, a.k.a. dynamic PWM
+    uint16_t top = PWM_GET(pwm_tops, level);
+
+    CH1_PWM = ch1_pwm;
+    CH2_PWM = ch2_pwm;
+    // wait to sync the counter and avoid flashes
+    while(actual_level && (PWM_CNT > (top - 32))) {}
+    PWM_TOP = top;
+    // force reset phase when turning on from zero
+    // (because otherwise the initial response is inconsistent)
+    if (! actual_level) PWM_CNT = 0;
+}
+
+bool gradual_tick_main(uint8_t gt) {
+    PWM_DATATYPE pwm1 = PWM_GET(pwm1_levels, gt);
+    PWM_DATATYPE pwm2 = PWM_GET(pwm2_levels, gt);
+
+    GRADUAL_ADJUST_STACKED(pwm1, CH1_PWM, PWM_TOP_INIT);
+    GRADUAL_ADJUST_SIMPLE (pwm2, CH2_PWM);
+
+    if (   (pwm1 == CH1_PWM)
+        && (pwm2 == CH2_PWM)
+       ) {
+        return true;  // done
+    }
+    return false;  // not done yet
+}
+