1 files changed, 60 insertions, 0 deletions
diff --git a/hwdef-noctigon-kr4-nofet.c b/hwdef-noctigon-kr4-nofet.c
new file mode 100644
index 0000000..0492def
--- /dev/null
+++ b/hwdef-noctigon-kr4-nofet.c
@@ -0,0 +1,60 @@
+// Noctigon KR4 (no DD FET) PWM helper functions
+// Copyright (C) 2020-2023 Selene ToyKeeper
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#pragma once
+
+#include "chan-rgbaux.c"
+
+void set_level_zero();
+
+void set_level_main(uint8_t level);
+bool gradual_tick_main(uint8_t gt);
+
+
+Channel channels[] = {
+    { // channel 1 only
+        .set_level    = set_level_main,
+        .gradual_tick = gradual_tick_main
+    },
+    RGB_AUX_CHANNELS
+};
+
+
+void set_level_zero() {
+    CH1_PWM = 0;
+    CH2_PWM = 0;
+    PWM_CNT = 0;  // reset phase
+    CH1_ENABLE_PORT &= ~(1 << CH1_ENABLE_PIN);  // disable opamp
+}
+
+// single set of LEDs with linear power channel
+void set_level_main(uint8_t level) {
+    CH1_ENABLE_PORT |= (1 << CH1_ENABLE_PIN);  // enable opamp
+
+    PWM_DATATYPE ch1_pwm = PWM_GET(pwm1_levels, level);
+    // pulse frequency modulation, a.k.a. dynamic PWM
+    uint16_t top = PWM_GET16(pwm_tops, level);
+
+    CH1_PWM = ch1_pwm;
+    CH2_PWM = 0;
+    // 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);
+
+    GRADUAL_ADJUST_SIMPLE(pwm1, CH1_PWM);
+
+    if (   (pwm1 == CH1_PWM)
+       ) {
+        return true;  // done
+    }
+    return false;  // not done yet
+}
+