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58 lines
1.7 KiB
C
58 lines
1.7 KiB
C
#include "fan_declarations.h"
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struct fan_state_t fan_state;
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static const uint8_t FAN_TICK_FREQ = 8U;
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void fan_set_power(uint8_t percentage) {
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fan_state.target_rpm = ((current_board->fan_max_rpm * CLAMP(percentage, 0U, 100U)) / 100U);
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}
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void llfan_init(void);
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void fan_init(void) {
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fan_state.cooldown_counter = current_board->fan_enable_cooldown_time * FAN_TICK_FREQ;
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llfan_init();
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}
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// Call this at FAN_TICK_FREQ
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void fan_tick(void) {
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const float FAN_I = 6.5f;
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if (current_board->fan_max_rpm > 0U) {
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// Measure fan RPM
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uint16_t fan_rpm_fast = fan_state.tach_counter * (60U * FAN_TICK_FREQ / 4U); // 4 interrupts per rotation
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fan_state.tach_counter = 0U;
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fan_state.rpm = (fan_rpm_fast + (3U * fan_state.rpm)) / 4U;
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#ifdef DEBUG_FAN
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puth(fan_state.target_rpm);
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print(" "); puth(fan_rpm_fast);
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print(" "); puth(fan_state.power);
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print("\n");
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#endif
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// Cooldown counter
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if (fan_state.target_rpm > 0U) {
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fan_state.cooldown_counter = current_board->fan_enable_cooldown_time * FAN_TICK_FREQ;
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} else {
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if (fan_state.cooldown_counter > 0U) {
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fan_state.cooldown_counter--;
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}
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}
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// Update controller
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if (fan_state.target_rpm == 0U) {
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fan_state.error_integral = 0.0f;
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} else {
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float error = (fan_state.target_rpm - fan_rpm_fast) / ((float) current_board->fan_max_rpm);
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fan_state.error_integral += FAN_I * error;
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}
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fan_state.error_integral = CLAMP(fan_state.error_integral, 0U, current_board->fan_max_pwm);
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fan_state.power = fan_state.error_integral;
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// Set PWM and enable line
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pwm_set(TIM3, 3, fan_state.power);
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current_board->set_fan_enabled((fan_state.target_rpm > 0U) || (fan_state.cooldown_counter > 0U));
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}
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}
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