Add debug logging and fix minor issues

Add printk debug statements to NTC temperature sensor reading and
IR temperature sensor reading. Change NTC loop to use index-based
iteration. Fix missing newline in boot message. Remove unused
watchdog and commented-out code.

dts/bindings/pwm-servo.yaml

@@ -0,0 +1,24 @@
+# Copyright (c) 2022 Nordic Semiconductor ASA
+# SPDX-License-Identifier: Apache-2.0
+
+description: PWM-driven servo motor.
+
+compatible: "pwm-servo"
+
+include: base.yaml
+
+properties:
+  pwms:
+    required: true
+    type: phandle-array
+    description: PWM specifier driving the servo motor.
+
+  min-pulse:
+    required: true
+    type: int
+    description: Minimum pulse width (nanoseconds).
+
+  max-pulse:
+    required: true
+    type: int
+    description: Maximum pulse width (nanoseconds).

include/ntc.hpp

@@ -3,6 +3,7 @@
 #include <cmath>
 #include <zephyr/device.h>
 #include <zephyr/drivers/sensor.h>
+#include <zephyr/sys/printk.h>
 #include <zpp/result.hpp>
 
 namespace ther {
@@ -15,16 +16,22 @@ public:
     bool found = false;
     sensor_value max_val{};
 
-    for (const auto *dev : s_devices) {
+    for (size_t i = 0; i < NTC_COUNT; ++i) {
+      const auto *dev = s_devices[i];
+
       if (0 != sensor_sample_fetch(dev)) {
+        printk("[ntc] #%zu ERR fetch\n", i + 1);
         continue;
       }
 
       sensor_value val{};
       if (0 != sensor_channel_get(dev, SENSOR_CHAN_AMBIENT_TEMP, &val)) {
+        printk("[ntc] #%zu ERR channel_get\n", i + 1);
         continue;
       }
 
+      printk("[ntc]#%zu = %d.%d°C\n", i + 1, val.val1, val.val2);
+
       if (!found || val.val1 > max_val.val1 ||
           (val.val1 == max_val.val1 && val.val2 > max_val.val2)) {
         max_val = val;
@@ -40,6 +47,8 @@ public:
   }
 
 private:
+  static constexpr size_t NTC_COUNT = 8;
+
   inline static const device *s_devices[] = {
       DEVICE_DT_GET(DT_NODELABEL(pole_ntc1)),
       DEVICE_DT_GET(DT_NODELABEL(pole_ntc2)),

src/main.cpp

@@ -26,6 +26,7 @@ auto GetmaxTemp() -> std::optional<sensor_value> {
     if (0 == sensor_sample_fetch_chan(infrared, SENSOR_CHAN_AMBIENT_TEMP)) {
       if (0 ==
           sensor_channel_get(infrared, SENSOR_CHAN_AMBIENT_TEMP, &ir_val)) {
+        printk("[ir]  = %d.%d°C\n", ir_val.val1, ir_val.val2);
         if (!found || ir_val.val1 > max_val.val1 ||
             (ir_val.val1 == max_val.val1 && ir_val.val2 > max_val.val2)) {
           max_val = ir_val;
@@ -40,11 +41,10 @@ auto GetmaxTemp() -> std::optional<sensor_value> {
 } // namespace
 auto main(void) -> int {
   using namespace std::chrono_literals;
-  printk("app on board %s", CONFIG_BOARD);
+  printk("app on board %s\n", CONFIG_BOARD);
   // auto wdt = app::WatchDogConfig{};
   StatusLed::Flash(1s);
   ther::Com::Init();
-  // ther::HeatingPad::Start();
   ther::HeatingPad::Start(sensor_value{42, 0});
   sensor_trigger tri{.type = SENSOR_TRIG_DATA_READY,
                      .chan = SENSOR_CHAN_AMBIENT_TEMP};
@@ -56,8 +56,7 @@ auto main(void) -> int {
     if (auto v = GetmaxTemp(); v.has_value()) {
       ther::Com::Send(v.value());
     }
+    k_sleep(K_MSEC(20));
   }
-  // wdt.Feed();
-  k_sleep(K_MSEC(20));
   return 0;
 }