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Vehicle Researcher
6adb63b915
date: 2026-06-04T09:49:56 master commit: c0ab3550eca2e9daf197c46b7e4b24aa9637cf2e
49 lines
1.3 KiB
C
49 lines
1.3 KiB
C
#include "board/drivers/drivers.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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if (percentage > 0U) {
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fan_state.power = CLAMP(percentage, 20U, 100U);
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} else {
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fan_state.power = 0U;
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}
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}
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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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if (current_board->has_fan) {
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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 to prevent noise on tachometer line.
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if (fan_state.power > 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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// 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.power > 0U) || (fan_state.cooldown_counter > 0U));
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}
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}
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