You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
57 lines
1.7 KiB
57 lines
1.7 KiB
#include "fan_declarations.h"
|
|
|
|
struct fan_state_t fan_state;
|
|
|
|
static const uint8_t FAN_TICK_FREQ = 8U;
|
|
|
|
void fan_set_power(uint8_t percentage) {
|
|
fan_state.target_rpm = ((current_board->fan_max_rpm * CLAMP(percentage, 0U, 100U)) / 100U);
|
|
}
|
|
|
|
void llfan_init(void);
|
|
void fan_init(void) {
|
|
fan_state.cooldown_counter = current_board->fan_enable_cooldown_time * FAN_TICK_FREQ;
|
|
llfan_init();
|
|
}
|
|
|
|
// Call this at FAN_TICK_FREQ
|
|
void fan_tick(void) {
|
|
const float FAN_I = 6.5f;
|
|
|
|
if (current_board->fan_max_rpm > 0U) {
|
|
// Measure fan RPM
|
|
uint16_t fan_rpm_fast = fan_state.tach_counter * (60U * FAN_TICK_FREQ / 4U); // 4 interrupts per rotation
|
|
fan_state.tach_counter = 0U;
|
|
fan_state.rpm = (fan_rpm_fast + (3U * fan_state.rpm)) / 4U;
|
|
|
|
#ifdef DEBUG_FAN
|
|
puth(fan_state.target_rpm);
|
|
print(" "); puth(fan_rpm_fast);
|
|
print(" "); puth(fan_state.power);
|
|
print("\n");
|
|
#endif
|
|
|
|
// Cooldown counter
|
|
if (fan_state.target_rpm > 0U) {
|
|
fan_state.cooldown_counter = current_board->fan_enable_cooldown_time * FAN_TICK_FREQ;
|
|
} else {
|
|
if (fan_state.cooldown_counter > 0U) {
|
|
fan_state.cooldown_counter--;
|
|
}
|
|
}
|
|
|
|
// Update controller
|
|
if (fan_state.target_rpm == 0U) {
|
|
fan_state.error_integral = 0.0f;
|
|
} else {
|
|
float error = (fan_state.target_rpm - fan_rpm_fast) / ((float) current_board->fan_max_rpm);
|
|
fan_state.error_integral += FAN_I * error;
|
|
}
|
|
fan_state.error_integral = CLAMP(fan_state.error_integral, 0U, current_board->fan_max_pwm);
|
|
fan_state.power = fan_state.error_integral;
|
|
|
|
// Set PWM and enable line
|
|
pwm_set(TIM3, 3, fan_state.power);
|
|
current_board->set_fan_enabled((fan_state.target_rpm > 0U) || (fan_state.cooldown_counter > 0U));
|
|
}
|
|
}
|
|
|