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// Sofirn LT1-t1616 PWM helpers
// Copyright (C) 2023 SiteRelEnby, Selene ToyKeeper
// SPDX-License-Identifier: GPL-3.0-or-later
#pragma once
#include "fsm/chan-aux.c"
void set_level_zero();
void set_level_ch1(uint8_t level);
void set_level_ch2(uint8_t level);
void set_level_both(uint8_t level);
void set_level_blend(uint8_t level);
void set_level_auto(uint8_t level);
bool gradual_tick_ch1(uint8_t gt);
bool gradual_tick_ch2(uint8_t gt);
bool gradual_tick_both(uint8_t gt);
bool gradual_tick_blend(uint8_t gt);
bool gradual_tick_auto(uint8_t gt);
Channel channels[] = {
{ // channel 1 only
.set_level = set_level_ch1,
.gradual_tick = gradual_tick_ch1,
.has_args = 0
},
{ // channel 2 only
.set_level = set_level_ch2,
.gradual_tick = gradual_tick_ch2,
.has_args = 0
},
{ // both channels, tied together (max "200%" power)
.set_level = set_level_both,
.gradual_tick = gradual_tick_both,
.has_args = 0
},
{ // both channels, manual blend (max "100%" power)
.set_level = set_level_blend,
.gradual_tick = gradual_tick_blend,
.has_args = 1
},
{ // both channels, auto blend
.set_level = set_level_auto,
.gradual_tick = gradual_tick_auto,
.has_args = 1
},
AUX_CHANNELS
};
void set_level_zero() {
// disable timer overflow interrupt
// (helps improve button press handling from Off state)
DSM_INTCTRL = 0;
// turn off all LEDs
ch1_dsm_lvl = 0;
ch2_dsm_lvl = 0;
CH1_PWM = 0;
CH2_PWM = 0;
PWM_CNT = 0;
}
void set_hw_levels(PWM_DATATYPE ch1, PWM_DATATYPE ch2) {
bool was_on = (CH1_PWM>0) || (CH2_PWM>0);
// set delta-sigma soft levels
ch1_dsm_lvl = ch1;
ch2_dsm_lvl = ch2;
// set hardware PWM levels and init dsm loop
CH1_PWM = ch1_pwm = ch1 >> 7;
CH2_PWM = ch2_pwm = ch2 >> 7;
// enable timer overflow interrupt so DSM can work
DSM_INTCTRL = DSM_OVF_bm;
// reset phase when turning on
if (! was_on) PWM_CNT = 0;
}
// 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;
CH2_PWM = ch2_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;
// repeat for other channels
ch2_dsm += (ch2_dsm_lvl & 0x007f);
ch2_pwm = (ch2_dsm_lvl >> 7) + (ch2_dsm > 0x7f);
ch2_dsm &= 0x7f;
// clear the interrupt flag to indicate it was handled
// as per: https://onlinedocs.microchip.com/pr/GUID-C37FFBA8-82C6-4339-A2B1-ABD9A0F6C162-en-US-8/index.html?GUID-C2A2BEFD-158F-413D-B9D4-0F0556AA79BD
DSM_INTFLAGS = DSM_OVF_bm;
}
void set_level_ch1(uint8_t level) {
set_hw_levels(PWM_GET(pwm1_levels, level), 0);
}
void set_level_ch2(uint8_t level) {
set_hw_levels(0, PWM_GET(pwm1_levels, level));
}
void set_level_both(uint8_t level) {
PWM_DATATYPE pwm = PWM_GET(pwm1_levels, level);
set_hw_levels(pwm, pwm);
}
void blend_helper(PWM_DATATYPE *warm, PWM_DATATYPE *cool, uint8_t level) {
PWM_DATATYPE brightness = PWM_GET(pwm1_levels, level);
uint8_t blend;
if (channel_mode == CM_AUTO) {
blend = 255 * (uint16_t)level / RAMP_SIZE;
if (cfg.channel_mode_args[channel_mode] & 0b01000000)
blend = 255 - blend;
} else {
blend = cfg.channel_mode_args[channel_mode];
}
calc_2ch_blend(warm, cool, brightness, DSM_TOP, blend);
}
void set_level_blend(uint8_t level) {
PWM_DATATYPE warm, cool;
blend_helper(&warm, &cool, level);
set_hw_levels(warm, cool);
}
void set_level_auto(uint8_t level) {
PWM_DATATYPE warm, cool;
blend_helper(&warm, &cool, level);
set_hw_levels(warm, cool);
}
///// "gradual tick" functions for smooth thermal regulation /////
// (and other smooth adjustments)
///// bump each channel toward a target value /////
bool gradual_adjust(PWM_DATATYPE ch1, PWM_DATATYPE ch2) {
// 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);
steps = ch2_dsm_lvl >> shift;
for (uint8_t i=0; i<=steps; i++)
GRADUAL_ADJUST_SIMPLE(ch2, ch2_dsm_lvl);
if ((ch1 == ch1_dsm_lvl)
&& (ch2 == ch2_dsm_lvl )) {
return true; // done
}
return false; // not done yet
}
bool gradual_tick_ch1(uint8_t gt) {
PWM_DATATYPE pwm = PWM_GET(pwm1_levels, gt);
return gradual_adjust(pwm, 0);
}
bool gradual_tick_ch2(uint8_t gt) {
PWM_DATATYPE pwm = PWM_GET(pwm1_levels, gt);
return gradual_adjust(0, pwm);
}
bool gradual_tick_both(uint8_t gt) {
PWM_DATATYPE pwm = PWM_GET(pwm1_levels, gt);
return gradual_adjust(pwm, pwm);
}
bool gradual_tick_blend(uint8_t gt) {
PWM_DATATYPE warm, cool;
blend_helper(&warm, &cool, gt);
return gradual_adjust(warm, cool);
}
bool gradual_tick_auto(uint8_t gt) {
PWM_DATATYPE warm, cool;
blend_helper(&warm, &cool, gt);
return gradual_adjust(warm, cool);
}
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