Chris Pepper
6 years ago
committed by
Scott Lahteine
Scott Lahteine
18 changed files with 369 additions and 284 deletions
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#ifdef __AVR__ |
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#include "../../inc/MarlinConfigPre.h" |
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/**
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* get_pwm_timer |
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* Grabs timer information and registers of the provided pin |
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* returns Timer struct containing this information |
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* Used by set_pwm_frequency, set_pwm_duty |
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* |
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*/ |
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#if ENABLED(FAST_PWM_FAN) |
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#include "HAL.h" |
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struct Timer { |
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volatile uint8_t* TCCRnQ[3]; // max 3 TCCR registers per timer
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volatile uint16_t* OCRnQ[3]; // max 3 OCR registers per timer
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volatile uint16_t* ICRn; // max 1 ICR register per timer
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uint8_t n; // the timer number [0->5]
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uint8_t q; // the timer output [0->2] (A->C)
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}; |
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Timer get_pwm_timer(pin_t pin) { |
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uint8_t q = 0; |
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switch (digitalPinToTimer(pin)) { |
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// Protect reserved timers (TIMER0 & TIMER1)
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#ifdef TCCR0A |
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#if !AVR_AT90USB1286_FAMILY |
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case TIMER0A: |
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#endif |
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case TIMER0B: |
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#endif |
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#ifdef TCCR1A |
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case TIMER1A: case TIMER1B: |
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#endif |
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break; |
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#if defined(TCCR2) || defined(TCCR2A) |
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#ifdef TCCR2 |
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case TIMER2: { |
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Timer timer = { |
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/*TCCRnQ*/ { &TCCR2, NULL, NULL}, |
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/*OCRnQ*/ { (uint16_t*)&OCR2, NULL, NULL}, |
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/*ICRn*/ NULL, |
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/*n, q*/ 2, 0 |
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}; |
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} |
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#elif defined TCCR2A |
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#if ENABLED(USE_OCR2A_AS_TOP) |
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case TIMER2A: break; // protect TIMER2A
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case TIMER2B: { |
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Timer timer = { |
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/*TCCRnQ*/ { &TCCR2A, &TCCR2B, NULL}, |
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/*OCRnQ*/ { (uint16_t*)&OCR2A, (uint16_t*)&OCR2B, NULL}, |
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/*ICRn*/ NULL, |
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/*n, q*/ 2, 1 |
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}; |
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return timer; |
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} |
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#else |
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case TIMER2B: ++q; |
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case TIMER2A: { |
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Timer timer = { |
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/*TCCRnQ*/ { &TCCR2A, &TCCR2B, NULL}, |
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/*OCRnQ*/ { (uint16_t*)&OCR2A, (uint16_t*)&OCR2B, NULL}, |
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/*ICRn*/ NULL, |
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2, q |
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}; |
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return timer; |
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} |
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#endif |
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#endif |
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#endif |
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#ifdef TCCR3A |
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case TIMER3C: ++q; |
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case TIMER3B: ++q; |
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case TIMER3A: { |
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Timer timer = { |
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/*TCCRnQ*/ { &TCCR3A, &TCCR3B, &TCCR3C}, |
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/*OCRnQ*/ { &OCR3A, &OCR3B, &OCR3C}, |
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/*ICRn*/ &ICR3, |
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/*n, q*/ 3, q |
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}; |
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return timer; |
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} |
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#endif |
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#ifdef TCCR4A |
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case TIMER4C: ++q; |
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case TIMER4B: ++q; |
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case TIMER4A: { |
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Timer timer = { |
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/*TCCRnQ*/ { &TCCR4A, &TCCR4B, &TCCR4C}, |
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/*OCRnQ*/ { &OCR4A, &OCR4B, &OCR4C}, |
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/*ICRn*/ &ICR4, |
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/*n, q*/ 4, q |
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}; |
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return timer; |
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} |
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#endif |
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#ifdef TCCR5A |
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case TIMER5C: ++q; |
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case TIMER5B: ++q; |
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case TIMER5A: { |
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Timer timer = { |
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/*TCCRnQ*/ { &TCCR5A, &TCCR5B, &TCCR5C}, |
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/*OCRnQ*/ { &OCR5A, &OCR5B, &OCR5C }, |
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/*ICRn*/ &ICR5, |
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/*n, q*/ 5, q |
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}; |
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return timer; |
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} |
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#endif |
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} |
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Timer timer = { |
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/*TCCRnQ*/ { NULL, NULL, NULL}, |
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/*OCRnQ*/ { NULL, NULL, NULL}, |
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/*ICRn*/ NULL, |
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0, 0 |
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}; |
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return timer; |
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} |
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void set_pwm_frequency(const pin_t pin, int f_desired) { |
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Timer timer = get_pwm_timer(pin); |
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if (timer.n == 0) return; // Don't proceed if protected timer or not recognised
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uint16_t size; |
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if (timer.n == 2) size = 255; else size = 65535; |
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uint16_t res = 255; // resolution (TOP value)
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uint8_t j = 0; // prescaler index
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uint8_t wgm = 1; // waveform generation mode
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// Calculating the prescaler and resolution to use to achieve closest frequency
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if (f_desired != 0) { |
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int f = (F_CPU) / (2 * 1024 * size) + 1; // Initialize frequency as lowest (non-zero) achievable
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uint16_t prescaler[] = { 0, 1, 8, /*TIMER2 ONLY*/32, 64, /*TIMER2 ONLY*/128, 256, 1024 }; |
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// loop over prescaler values
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for (uint8_t i = 1; i < 8; i++) { |
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uint16_t res_temp_fast = 255, res_temp_phase_correct = 255; |
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if (timer.n == 2) { |
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// No resolution calculation for TIMER2 unless enabled USE_OCR2A_AS_TOP
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#if ENABLED(USE_OCR2A_AS_TOP) |
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const uint16_t rtf = (F_CPU) / (prescaler[i] * f_desired); |
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res_temp_fast = rtf - 1; |
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res_temp_phase_correct = rtf / 2; |
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#endif |
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} |
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else { |
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// Skip TIMER2 specific prescalers when not TIMER2
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if (i == 3 || i == 5) continue; |
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const uint16_t rtf = (F_CPU) / (prescaler[i] * f_desired); |
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res_temp_fast = rtf - 1; |
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res_temp_phase_correct = rtf / 2; |
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} |
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LIMIT(res_temp_fast, 1u, size); |
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LIMIT(res_temp_phase_correct, 1u, size); |
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// Calculate frequencies of test prescaler and resolution values
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const int f_temp_fast = (F_CPU) / (prescaler[i] * (1 + res_temp_fast)), |
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f_temp_phase_correct = (F_CPU) / (2 * prescaler[i] * res_temp_phase_correct), |
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f_diff = ABS(f - f_desired), |
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f_fast_diff = ABS(f_temp_fast - f_desired), |
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f_phase_diff = ABS(f_temp_phase_correct - f_desired); |
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// If FAST values are closest to desired f
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if (f_fast_diff < f_diff && f_fast_diff <= f_phase_diff) { |
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// Remember this combination
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f = f_temp_fast; |
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res = res_temp_fast; |
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j = i; |
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// Set the Wave Generation Mode to FAST PWM
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if (timer.n == 2) { |
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wgm = ( |
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#if ENABLED(USE_OCR2A_AS_TOP) |
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WGM2_FAST_PWM_OCR2A |
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#else |
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WGM2_FAST_PWM |
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#endif |
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); |
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} |
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else wgm = WGM_FAST_PWM_ICRn; |
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} |
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// If PHASE CORRECT values are closes to desired f
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else if (f_phase_diff < f_diff) { |
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f = f_temp_phase_correct; |
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res = res_temp_phase_correct; |
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j = i; |
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// Set the Wave Generation Mode to PWM PHASE CORRECT
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if (timer.n == 2) { |
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wgm = ( |
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#if ENABLED(USE_OCR2A_AS_TOP) |
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WGM2_PWM_PC_OCR2A |
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#else |
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WGM2_PWM_PC |
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#endif |
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); |
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} |
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else wgm = WGM_PWM_PC_ICRn; |
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} |
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} |
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} |
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_SET_WGMnQ(timer.TCCRnQ, wgm); |
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_SET_CSn(timer.TCCRnQ, j); |
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if (timer.n == 2) { |
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#if ENABLED(USE_OCR2A_AS_TOP) |
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_SET_OCRnQ(timer.OCRnQ, 0, res); // Set OCR2A value (TOP) = res
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#endif |
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} |
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else |
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_SET_ICRn(timer.ICRn, res); // Set ICRn value (TOP) = res
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} |
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void set_pwm_duty(const pin_t pin, const uint16_t v, const uint16_t v_size/*=255*/, const bool invert/*=false*/) { |
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// If v is 0 or v_size (max), digitalWrite to LOW or HIGH.
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// Note that digitalWrite also disables pwm output for us (sets COM bit to 0)
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if (v == 0) |
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digitalWrite(pin, invert); |
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else if (v == v_size) |
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digitalWrite(pin, !invert); |
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else { |
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Timer timer = get_pwm_timer(pin); |
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if (timer.n == 0) return; // Don't proceed if protected timer or not recognised
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// Set compare output mode to CLEAR -> SET or SET -> CLEAR (if inverted)
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_SET_COMnQ(timer.TCCRnQ, (timer.q |
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#ifdef TCCR2 |
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+ (timer.q == 2) // COM20 is on bit 4 of TCCR2, thus requires q + 1 in the macro
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#endif |
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), COM_CLEAR_SET + invert |
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); |
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uint16_t top; |
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if (timer.n == 2) { // if TIMER2
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top = ( |
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#if ENABLED(USE_OCR2A_AS_TOP) |
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*timer.OCRnQ[0] // top = OCR2A
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#else |
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255 // top = 0xFF (max)
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#endif |
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); |
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} |
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else |
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top = *timer.ICRn; // top = ICRn
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_SET_OCRnQ(timer.OCRnQ, timer.q, v * float(top / v_size)); // Scale 8/16-bit v to top value
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} |
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} |
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#endif // FAST_PWM_FAN
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#endif // __AVR__
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@ -0,0 +1,40 @@ |
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/**
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* Marlin 3D Printer Firmware |
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* Copyright (C) 2019 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
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* |
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* Based on Sprinter and grbl. |
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* Copyright (C) 2011 Camiel Gubbels / Erik van der Zalm |
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* |
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* This program is free software: you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation, either version 3 of the License, or |
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* (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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* |
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*/ |
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#ifdef TARGET_LPC1768 |
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#include "../../inc/MarlinConfigPre.h" |
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#if ENABLED(FAST_PWM_FAN) |
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#include <pwm.h> |
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void set_pwm_frequency(const pin_t pin, int f_desired) { |
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pwm_set_frequency(pin, f_desired); |
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} |
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void set_pwm_duty(const pin_t pin, const uint16_t v, const uint16_t v_size/*=255*/, const bool invert/*=false*/) { |
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pwm_write_ratio(pin, invert ? 1.0f - (float)v / v_size : (float)v / v_size); |
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} |
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#endif // FAST_PWM_FAN
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#endif // TARGET_LPC1768
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