tec: init freq pins for 1 MHz switching

firmware/src/board/gpio.rs

@@ -72,7 +72,11 @@ pub struct PE4;
 def_gpio!(GPIO_PORTE_AHB, PE4, 4);
 pub struct PE5;
 def_gpio!(GPIO_PORTE_AHB, PE5, 5);
+pub struct PK1;
+def_gpio!(GPIO_PORTK, PK1, 1);
 pub struct PP2;
 def_gpio!(GPIO_PORTP, PP2, 2);
 pub struct PP3;
 def_gpio!(GPIO_PORTP, PP3, 3);
+pub struct PQ4;
+def_gpio!(GPIO_PORTQ, PQ4, 4);

firmware/src/tec.rs

@@ -1,6 +1,6 @@
 use core::fmt;
 use crate::board::pwm::{self, PwmChannel, PwmPeripheral};
-use crate::board::gpio::{Gpio, GpioOutput, PP2, PP3};
+use crate::board::gpio::{Gpio, GpioOutput, PP2, PP3, PK1, PQ4};
 use embedded_hal::digital::v2::OutputPin;
 
 #[derive(Clone, Copy, Debug)]
@@ -46,6 +46,17 @@ where
     pin
 }
 
+fn setup_freq<G>(gpio: G)
+where
+    G: Gpio,
+    GpioOutput<G>: OutputPin,
+{
+    let mut pin = gpio.into_output();
+    // Switching Frequency Select
+    // high: 1 MHz, low: 500 kHz
+    let _ = pin.set_high();
+}
+
 /// Thermo-Electric Cooling device controlled through four PWM
 /// channels
 pub struct Tec<MaxIPos: PwmChannel, MaxINeg: PwmChannel, ISet: PwmChannel, MaxV: PwmChannel, SHDN: OutputPin> {
@@ -61,6 +72,7 @@ impl Tec<pwm::T2CCP0, pwm::T2CCP1, pwm::T3CCP0, pwm::T3CCP1, GpioOutput<PP2>> {
         let (max_i_pos, max_i_neg) = tm4c129x::TIMER2::split();
         let (i_set, max_v) = tm4c129x::TIMER3::split();
         let shdn = setup_shdn(PP2);
+        setup_freq(PK1);
         Tec { max_i_pos, max_i_neg, i_set, max_v, shdn }
     }
 }
@@ -70,6 +82,7 @@ impl Tec<pwm::T4CCP0, pwm::T4CCP1, pwm::T5CCP0, pwm::T5CCP1, GpioOutput<PP3>> {
         let (max_i_pos, max_i_neg) = tm4c129x::TIMER4::split();
         let (i_set, max_v) = tm4c129x::TIMER5::split();
         let shdn = setup_shdn(PP3);
+        setup_freq(PQ4);
         Tec { max_i_pos, max_i_neg, i_set, max_v, shdn }
     }
 }