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ionpak-thermostat
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tec: keep shdn off until first use

master
Astro 2019-11-13 20:00:34 +01:00
parent 6041e41716
commit ecdebe76bc
1 changed files with 18 additions and 12 deletions
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30
firmware/src/tec.rs
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@ -35,44 +35,47 @@ impl fmt::Display for TecPin {
}
}
fn enable_shdn<G>(gpio: G)
fn setup_shdn<G>(gpio: G) -> GpioOutput<G>
where
G: Gpio,
GpioOutput<G>: OutputPin,
{
let mut pin = gpio.into_output();
let _ = pin.set_high();
// keep off until first use
let _ = pin.set_low();
pin
}
/// Thermo-Electric Cooling device controlled through four PWM
/// channels
pub struct Tec<MaxIPos: PwmChannel, MaxINeg: PwmChannel, ISet: PwmChannel, MaxV: PwmChannel> {
pub struct Tec<MaxIPos: PwmChannel, MaxINeg: PwmChannel, ISet: PwmChannel, MaxV: PwmChannel, SHDN: OutputPin> {
max_i_pos: MaxIPos,
max_i_neg: MaxINeg,
i_set: ISet,
max_v: MaxV,
shdn: SHDN,
}
impl Tec<pwm::T2CCP0, pwm::T2CCP1, pwm::T3CCP0, pwm::T3CCP1> {
impl Tec<pwm::T2CCP0, pwm::T2CCP1, pwm::T3CCP0, pwm::T3CCP1, GpioOutput<PP4>> {
pub fn tec0() -> Self {
let (max_i_pos, max_i_neg) = tm4c129x::TIMER2::split();
let (i_set, max_v) = tm4c129x::TIMER3::split();
enable_shdn(PP4);
Tec { max_i_pos, max_i_neg, i_set, max_v }
let shdn = setup_shdn(PP4);
Tec { max_i_pos, max_i_neg, i_set, max_v, shdn }
}
}
impl Tec<pwm::T4CCP0, pwm::T4CCP1, pwm::T5CCP0, pwm::T5CCP1> {
impl Tec<pwm::T4CCP0, pwm::T4CCP1, pwm::T5CCP0, pwm::T5CCP1, GpioOutput<PP5>> {
pub fn tec1() -> Self {
let (max_i_pos, max_i_neg) = tm4c129x::TIMER4::split();
let (i_set, max_v) = tm4c129x::TIMER5::split();
enable_shdn(PP5);
Tec { max_i_pos, max_i_neg, i_set, max_v }
let shdn = setup_shdn(PP5);
Tec { max_i_pos, max_i_neg, i_set, max_v, shdn }
}
}
impl<MaxIPos: PwmChannel, MaxINeg: PwmChannel, ISet: PwmChannel, MaxV: PwmChannel> Tec<MaxIPos, MaxINeg, ISet, MaxV> {
impl<MaxIPos: PwmChannel, MaxINeg: PwmChannel, ISet: PwmChannel, MaxV: PwmChannel, SHDN: OutputPin> Tec<MaxIPos, MaxINeg, ISet, MaxV, SHDN> {
pub fn setup(mut self, max: u16) -> Self {
self.max_i_pos.set(max, max);
self.max_i_neg.set(max, max);
@ -99,8 +102,11 @@ impl<MaxIPos: PwmChannel, MaxINeg: PwmChannel, ISet: PwmChannel, MaxV: PwmChanne
self.max_i_pos.set(width, total),
TecPin::MaxINeg =>
self.max_i_neg.set(width, total),
TecPin::ISet =>
self.i_set.set(width, total),
TecPin::ISet => {
self.i_set.set(width, total);
// enable on first use
let _ = self.shdn.set_high();
}
TecPin::MaxV =>
self.max_v.set(width, total),
}