feat: add tests with ceedling

Author: Pancakem

app/src/bme280.c

@@ -44,7 +44,7 @@ int16_t bme280_get_temperature(void) {
     LOG_ERR("get temperature failed (%d)", ret);
     return -1;
   }
-  return sensor_value_to_temperature(t);
+  return sensor_value_to_temperature(&t);
 }
 
 uint32_t bme280_get_pressure(void) {
@@ -60,7 +60,7 @@ uint32_t bme280_get_pressure(void) {
     return (uint32_t)-1;
   }
 
-  return sensor_value_to_pressure(p);
+  return sensor_value_to_pressure(&p);
 }
 
 /* Return humidity in centi-%RH (e.g., 4567 => 45.67%) */
@@ -77,5 +77,5 @@ uint16_t bme280_get_humidity(void) {
     return (uint16_t)-1;
   }
 
-  return sensor_value_to_humidity(h);
+  return sensor_value_to_humidity(&h);
 }

app/src/conversions.c

@@ -1,7 +1,20 @@
 #include "conversions.h"
 
 /* conversions */
-uint32_t sensor_value_to_pressure(struct sensor_value value) {
+uint32_t sensor_value_to_pressure(void *val) {
+  /* this hack to allow testing in ceedling without reliance on the
+     <zephyr/drivers/sensor.h> library
+   */
+  struct sensor_value {
+    int32_t val1;
+    int32_t val2;
+  };
+
+  if (!val) {
+    return 0;
+  }
+
+  struct sensor_value value = *(struct sensor_value *)val;
   /* Zephyr pressure: val1 in kPa, val2 in micro-kPa */
   /* Convert to Pa: kPa * 1000 + microkPa * 0.001 */
   int64_t pa = (int64_t)value.val1 * 1000 + (int64_t)(value.val2 / 1000);
@@ -11,7 +24,17 @@ uint32_t sensor_value_to_pressure(struct sensor_value value) {
   return (uint32_t)pa;
 }
 
-uint16_t sensor_value_to_humidity(struct sensor_value value) {
+uint16_t sensor_value_to_humidity(void *val) {
+  struct sensor_value {
+    int32_t val1;
+    int32_t val2;
+  };
+
+  if (!val) {
+    return 0;
+  }
+
+  struct sensor_value value = *(struct sensor_value *)val;
   /* %RH: val1 in %, val2 in micro-% */
   int32_t cpermil = (int32_t)value.val1 * 100 + (int32_t)(value.val2 / 10000);
   if (cpermil < 0)
@@ -21,7 +44,17 @@ uint16_t sensor_value_to_humidity(struct sensor_value value) {
   return (uint16_t)cpermil;
 }
 
-int16_t sensor_value_to_temperature(struct sensor_value value) {
+int16_t sensor_value_to_temperature(void *val) {
+  struct sensor_value {
+    int32_t val1;
+    int32_t val2;
+  };
+
+  if (!val) {
+    return 0;
+  }
+
+  struct sensor_value value = *(struct sensor_value *)val;
   /* t.val1 in °C, t.val2 in 1e-6 °C */
   int32_t cdeg = (int32_t)value.val1 * 100 +
                  (int32_t)(value.val2 / 10000); // 1e-6 / 1e4 = 1e-2

app/src/conversions.h

@@ -3,10 +3,8 @@
 
 #include <stdint.h>
 
-#include <zephyr/drivers/sensor.h>
-
-uint32_t sensor_value_to_pressure(struct sensor_value value);
-uint16_t sensor_value_to_humidity(struct sensor_value value);
-int16_t sensor_value_to_temperature(struct sensor_value value);
+uint32_t sensor_value_to_pressure(void *value);
+uint16_t sensor_value_to_humidity(void *value);
+int16_t sensor_value_to_temperature(void *value);
 
 #endif

app/src/sensors.c

@@ -54,7 +54,7 @@ int16_t sensor_get_temperature(void) {
     return (int16_t)-1;
   }
 
-  return sensor_value_to_temperature(temp);
+  return sensor_value_to_temperature(&temp);
 #else
   return bme280_get_temperature();
 #endif
@@ -74,7 +74,7 @@ uint32_t sensor_get_pressure(void) {
     return (int16_t)-1;
   }
 
-  return sensor_value_to_pressure(press);
+  return sensor_value_to_pressure(&press);
 #else
   return bme280_get_pressure();
 #endif
@@ -93,7 +93,7 @@ uint16_t sensor_get_humidity(void) {
     return (int16_t)-1;
   }
 
-  return sensor_value_to_humidity(humid);
+  return sensor_value_to_humidity(&humid);
 #else
   return bme280_get_humidity();
 #endif