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Change PWM freq to 25kHz 

Signed-off-by: Egor Savkin <es@m-labs.hk>
pull/73/head
Egor Savkin 2023-02-02 10:52:22 +08:00
parent e6d928ef4e
commit 069e178966
2 changed files with 5 additions and 7 deletions
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4
src/fan_ctrl.rs
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@ -18,8 +18,8 @@ const MAX_TEC_I: f64 = 3.0;
const MAX_USER_FAN_PWM: f64 = 100.0;
const MIN_USER_FAN_PWM: f64 = 1.0;
const MAX_FAN_PWM: f64 = 1.0;
// below this value motor circuit assumes there is no signal and runs full speed
const MIN_FAN_PWM: f64 = 0.02;
// below this value motor's autostart feature may fail
const MIN_FAN_PWM: f64 = 0.04;
const DEFAULT_K_A: f64 = 1.0;
const DEFAULT_K_B: f64 = 0.0;

8
src/pins.rs
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@ -226,11 +226,9 @@ impl Pins {
hclk: clocks.hclk(),
};
// Though there is not enough evidence available for concrete fan model,
// it is generally advised to have higher PWM frequencies for brushless motors,
// so that it would produce less audible noise.
// Source: https://www.controleng.com/articles/understanding-the-effect-of-pwm-when-controlling-a-brushless-dc-motor/
let fan = Timer::new(tim8, &clocks).pwm(gpioc.pc9.into_alternate(), 80u32.khz());
// According to `SUNON DC Brushless Fan & Blower(255-E)` catalogue p.36-37
// Model name: MF35101V1-1000U-G99
let fan = Timer::new(tim8, &clocks).pwm(gpioc.pc9.into_alternate(), 25u32.khz());
(pins, leds, eeprom, eth_pins, usb, fan)
}