1 files changed, 97 insertions, 0 deletions
diff --git a/hw/hank/noctigon-dm11/boost/hwdef.c b/hw/hank/noctigon-dm11/boost/hwdef.c
new file mode 100644
index 0000000..e601132
--- /dev/null
+++ b/hw/hank/noctigon-dm11/boost/hwdef.c
@@ -0,0 +1,97 @@
+// Noctigon DM11 (boost driver) PWM helper functions
+// Copyright (C) 2023 Selene ToyKeeper
+// SPDX-License-Identifier: GPL-3.0-or-later
+#pragma once
+
+#include "fsm/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() {
+    // disable timer overflow interrupt
+    // (helps improve button press handling from Off state)
+    DSM_INTCTRL &= ~DSM_OVF_bm;
+
+    // turn off all LEDs
+    ch1_dsm_lvl = 0;
+    CH1_PWM = 0;
+    PWM_CNT = 0;  // reset phase
+    CH1_ENABLE_PORT  &= ~(1 << CH1_ENABLE_PIN );  // disable opamp
+    CH1_ENABLE_PORT2 &= ~(1 << CH1_ENABLE_PIN2);  // disable PMIC
+}
+
+// single set of LEDs with single power channel, boost
+void set_level_main(uint8_t level) {
+    PWM_DATATYPE ch1 = PWM_GET(pwm1_levels, level);
+
+    // set delta-sigma soft levels
+    ch1_dsm_lvl = ch1;
+
+    // set hardware PWM levels and init dsm loop
+    CH1_PWM = ch1_pwm = ch1 >> 7;
+
+    // enable timer overflow interrupt so DSM can work
+    DSM_INTCTRL |= DSM_OVF_bm;
+
+    // force reset phase when turning on from zero
+    // (because otherwise the initial response is inconsistent)
+    if (! actual_level) PWM_CNT = 0;
+
+    CH1_ENABLE_PORT  |= (1 << CH1_ENABLE_PIN );  // enable opamp
+    CH1_ENABLE_PORT2 |= (1 << CH1_ENABLE_PIN2);  // enable PMIC
+}
+
+// delta-sigma modulation of PWM outputs
+// happens on each Timer overflow (every 512 cpu clock cycles)
+// uses 8-bit pwm w/ 7-bit dsm (0b 0PPP PPPP PDDD DDDD)
+ISR(DSM_vect) {
+    // set new hardware values first,
+    // for best timing (reduce effect of interrupt jitter)
+    CH1_PWM = ch1_pwm;
+
+    // calculate next values, now that timing matters less
+
+    // accumulate error
+    ch1_dsm += (ch1_dsm_lvl & 0x007f);
+    // next PWM = base PWM value + carry bit
+    ch1_pwm  = (ch1_dsm_lvl >> 7) + (ch1_dsm > 0x7f);
+    // clear carry bit
+    ch1_dsm &= 0x7f;
+}
+
+
+bool gradual_tick_main(uint8_t gt) {
+    PWM_DATATYPE ch1 = PWM_GET(pwm1_levels, gt);
+
+    // adjust multiple times based on current brightness
+    // (so it adjusts faster/coarser when bright, slower/finer when dim)
+
+    // higher shift = slower/finer adjustments
+    const uint8_t shift = 9;  // ((255 << 7) >> 9) = 63 max
+    uint8_t steps;
+
+    steps = ch1_dsm_lvl >> shift;
+    for (uint8_t i=0; i<=steps; i++)
+        GRADUAL_ADJUST_SIMPLE(ch1, ch1_dsm_lvl);
+
+    if ((ch1 == ch1_dsm_lvl)
+       ) {
+        return true;  // done
+    }
+    return false;  // not done yet
+}
+