Merge pull request #6100 from thinkyhead/rc_soft_pwm_dither
Enhancement of PWM, with dithering
This commit is contained in:
Scott Lahteine
GitHub
commit
5a2abeca78
@ -1425,6 +1425,12 @@
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// at zero value, there are 128 effective control positions.
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#define SOFT_PWM_SCALE 0
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// If SOFT_PWM_SCALE is set to a value higher than 0, dithering can
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// be used to mitigate the associated resolution loss. If enabled,
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// some of the PWM cycles are stretched so on average the wanted
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// duty cycle is attained.
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//#define SOFT_PWM_DITHER
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// Temperature status LEDs that display the hotend and bed temperature.
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// If all hotends and bed temperature and temperature setpoint are < 54C then the BLUE led is on.
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// Otherwise the RED led is on. There is 1C hysteresis.
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@ -1512,6 +1512,8 @@ void Temperature::isr() {
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static uint8_t temp_count = 0;
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static TempState temp_state = StartupDelay;
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static uint8_t pwm_count = _BV(SOFT_PWM_SCALE);
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// avoid multiple loads of pwm_count
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uint8_t pwm_count_tmp = pwm_count;
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// Static members for each heater
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#if ENABLED(SLOW_PWM_HEATERS)
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@ -1521,7 +1523,7 @@ void Temperature::isr() {
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static uint8_t state_heater_ ## n = 0; \
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static uint8_t state_timer_heater_ ## n = 0
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#else
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#define ISR_STATICS(n) static uint8_t soft_pwm_ ## n
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#define ISR_STATICS(n) static uint8_t soft_pwm_ ## n = 0
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#endif
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// Statics per heater
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@ -1544,72 +1546,82 @@ void Temperature::isr() {
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#endif
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#if DISABLED(SLOW_PWM_HEATERS)
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constexpr uint8_t pwm_mask =
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#if ENABLED(SOFT_PWM_DITHER)
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_BV(SOFT_PWM_SCALE) - 1
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#else
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0
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#endif
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;
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/**
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* Standard PWM modulation
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*/
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if (pwm_count == 0) {
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soft_pwm_0 = soft_pwm[0];
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WRITE_HEATER_0(soft_pwm_0 > 0 ? HIGH : LOW);
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if (pwm_count_tmp >= 127) {
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pwm_count_tmp -= 127;
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soft_pwm_0 = (soft_pwm_0 & pwm_mask) + soft_pwm[0];
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WRITE_HEATER_0(soft_pwm_0 > pwm_mask ? HIGH : LOW);
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#if HOTENDS > 1
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soft_pwm_1 = soft_pwm[1];
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WRITE_HEATER_1(soft_pwm_1 > 0 ? HIGH : LOW);
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soft_pwm_1 = (soft_pwm_1 & pwm_mask) + soft_pwm[1];
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WRITE_HEATER_1(soft_pwm_1 > pwm_mask ? HIGH : LOW);
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#if HOTENDS > 2
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soft_pwm_2 = soft_pwm[2];
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WRITE_HEATER_2(soft_pwm_2 > 0 ? HIGH : LOW);
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soft_pwm_2 = (soft_pwm_2 & pwm_mask) + soft_pwm[2];
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WRITE_HEATER_2(soft_pwm_2 > pwm_mask ? HIGH : LOW);
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#if HOTENDS > 3
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soft_pwm_3 = soft_pwm[3];
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WRITE_HEATER_3(soft_pwm_3 > 0 ? HIGH : LOW);
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soft_pwm_3 = (soft_pwm_3 & pwm_mask) + soft_pwm[3];
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WRITE_HEATER_3(soft_pwm_3 > pwm_mask ? HIGH : LOW);
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#endif
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#endif
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#endif
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#if HAS_HEATER_BED
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soft_pwm_BED = soft_pwm_bed;
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WRITE_HEATER_BED(soft_pwm_BED > 0 ? HIGH : LOW);
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soft_pwm_BED = (soft_pwm_BED & pwm_mask) + soft_pwm_bed;
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WRITE_HEATER_BED(soft_pwm_BED > pwm_mask ? HIGH : LOW);
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#endif
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#if ENABLED(FAN_SOFT_PWM)
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#if HAS_FAN0
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soft_pwm_fan[0] = fanSpeedSoftPwm[0] >> 1;
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WRITE_FAN(soft_pwm_fan[0] > 0 ? HIGH : LOW);
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soft_pwm_fan[0] = (soft_pwm_fan[0] & pwm_mask) + fanSpeedSoftPwm[0] >> 1;
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WRITE_FAN(soft_pwm_fan[0] > pwm_mask ? HIGH : LOW);
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#endif
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#if HAS_FAN1
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soft_pwm_fan[1] = fanSpeedSoftPwm[1] >> 1;
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WRITE_FAN1(soft_pwm_fan[1] > 0 ? HIGH : LOW);
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soft_pwm_fan[1] = (soft_pwm_fan[1] & pwm_mask) + fanSpeedSoftPwm[1] >> 1;
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WRITE_FAN1(soft_pwm_fan[1] > pwm_mask ? HIGH : LOW);
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#endif
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#if HAS_FAN2
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soft_pwm_fan[2] = fanSpeedSoftPwm[2] >> 1;
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WRITE_FAN2(soft_pwm_fan[2] > 0 ? HIGH : LOW);
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soft_pwm_fan[2] = (soft_pwm_fan[2] & pwm_mask) + fanSpeedSoftPwm[2] >> 1;
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WRITE_FAN2(soft_pwm_fan[2] > pwm_mask ? HIGH : LOW);
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#endif
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#endif
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}
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if (soft_pwm_0 < pwm_count) WRITE_HEATER_0(0);
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else {
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if (soft_pwm_0 <= pwm_count_tmp) WRITE_HEATER_0(0);
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#if HOTENDS > 1
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if (soft_pwm_1 < pwm_count) WRITE_HEATER_1(0);
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if (soft_pwm_1 <= pwm_count_tmp) WRITE_HEATER_1(0);
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#endif
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#if HOTENDS > 2
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if (soft_pwm_2 < pwm_count) WRITE_HEATER_2(0);
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if (soft_pwm_2 <= pwm_count_tmp) WRITE_HEATER_2(0);
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#endif
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#if HOTENDS > 3
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if (soft_pwm_3 < pwm_count) WRITE_HEATER_3(0);
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#endif
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#endif
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if (soft_pwm_3 <= pwm_count_tmp) WRITE_HEATER_3(0);
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#endif
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#if HAS_HEATER_BED
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if (soft_pwm_BED < pwm_count) WRITE_HEATER_BED(0);
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if (soft_pwm_BED <= pwm_count_tmp) WRITE_HEATER_BED(0);
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#endif
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#if ENABLED(FAN_SOFT_PWM)
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#if HAS_FAN0
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if (soft_pwm_fan[0] < pwm_count) WRITE_FAN(0);
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if (soft_pwm_fan[0] <= pwm_count_tmp) WRITE_FAN(0);
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#endif
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#if HAS_FAN1
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if (soft_pwm_fan[1] < pwm_count) WRITE_FAN1(0);
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if (soft_pwm_fan[1] <= pwm_count_tmp) WRITE_FAN1(0);
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#endif
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#if HAS_FAN2
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if (soft_pwm_fan[2] < pwm_count) WRITE_FAN2(0);
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if (soft_pwm_fan[2] <= pwm_count_tmp) WRITE_FAN2(0);
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#endif
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#endif
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}
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// SOFT_PWM_SCALE to frequency:
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//
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@ -1619,8 +1631,7 @@ void Temperature::isr() {
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// 3: / 16 = 61.0352 Hz
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// 4: / 8 = 122.0703 Hz
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// 5: / 4 = 244.1406 Hz
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pwm_count += _BV(SOFT_PWM_SCALE);
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pwm_count &= 0x7F;
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pwm_count = pwm_count_tmp + _BV(SOFT_PWM_SCALE);
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#else // SLOW_PWM_HEATERS
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@ -1694,7 +1705,8 @@ void Temperature::isr() {
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#endif
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#if ENABLED(FAN_SOFT_PWM)
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if (pwm_count == 0) {
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if (pwm_count_tmp >= 127) {
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pwm_count_tmp = 0;
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#if HAS_FAN0
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soft_pwm_fan[0] = fanSpeedSoftPwm[0] >> 1;
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WRITE_FAN(soft_pwm_fan[0] > 0 ? HIGH : LOW);
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@ -1709,13 +1721,13 @@ void Temperature::isr() {
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#endif
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}
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#if HAS_FAN0
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if (soft_pwm_fan[0] < pwm_count) WRITE_FAN(0);
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if (soft_pwm_fan[0] <= pwm_count_tmp) WRITE_FAN(0);
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#endif
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#if HAS_FAN1
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if (soft_pwm_fan[1] < pwm_count) WRITE_FAN1(0);
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if (soft_pwm_fan[1] <= pwm_count_tmp) WRITE_FAN1(0);
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#endif
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#if HAS_FAN2
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if (soft_pwm_fan[2] < pwm_count) WRITE_FAN2(0);
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if (soft_pwm_fan[2] <= pwm_count_tmp) WRITE_FAN2(0);
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#endif
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#endif // FAN_SOFT_PWM
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@ -1727,13 +1739,13 @@ void Temperature::isr() {
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// 3: / 16 = 61.0352 Hz
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// 4: / 8 = 122.0703 Hz
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// 5: / 4 = 244.1406 Hz
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pwm_count += _BV(SOFT_PWM_SCALE);
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pwm_count &= 0x7F;
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pwm_count = pwm_count_tmp + _BV(SOFT_PWM_SCALE);
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// increment slow_pwm_count only every 64 pwm_count (e.g., every 8s)
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if ((pwm_count % 64) == 0) {
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// increment slow_pwm_count only every 64th pwm_count,
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// i.e. yielding a PWM frequency of 16/128 Hz (8s).
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if (((pwm_count >> SOFT_PWM_SCALE) & 0x3F) == 0) {
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slow_pwm_count++;
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slow_pwm_count &= 0x7f;
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slow_pwm_count &= 0x7F;
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// EXTRUDER 0
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if (state_timer_heater_0 > 0) state_timer_heater_0--;
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@ -1749,7 +1761,7 @@ void Temperature::isr() {
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#if HAS_HEATER_BED
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if (state_timer_heater_BED > 0) state_timer_heater_BED--;
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#endif
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} // (pwm_count % 64) == 0
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} // ((pwm_count >> SOFT_PWM_SCALE) & 0x3F) == 0
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#endif // SLOW_PWM_HEATERS
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