Add configurable thresholds for sensor data which will generate alert…

… conditions.

Signed-off-by: Brian Bradley <brian.bradley.p@gmail.com>

app/CMakeLists.txt

@@ -7,7 +7,7 @@
 cmake_minimum_required(VERSION 3.20.0)
 find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
 
-project(app LANGUAGES C VERSION 0.2.0)
+project(app LANGUAGES C VERSION 0.2.1)
 
 configure_file(app_version.h.in ${CMAKE_BINARY_DIR}/app/include/app_version.h)
 target_include_directories(app PRIVATE ${CMAKE_BINARY_DIR}/app/include src)

app/Kconfig

@@ -60,6 +60,28 @@ config PYRRHA_FCB_MAGIC
 	  Magic 32-bit word for to identify valid settings area
 endmenu
 
+menu "alerts"
+
+config CO_ALERT_THRESHOLD_PPM
+    int "Threshold in ppm for co alerts"
+    range 1 1000
+    default 420
+	help
+	  Threshold in PPM for CO level when an alert is generated.
+	  420ppm is the AEGL2 10 minute limit.
+config NO2_ALERT_THRESHOLD_PPM
+    int "Threshold in ppm for no2 alerts"
+    range 1 100
+    default 8
+	help
+	  Threshold in PPM for NO2 level when an alert is generated.
+	  20ppm is the AEGL2 10 minute limit.
+config TEMPERATURE_ALERT_THRESHOLD_CELCIUS
+    int "Threshold in celcius for temperature alerts"
+    range 60 120
+    default 80
+endmenu
+
 config PYRRHA_SAMPLE_PERIOD
     int "Period (in seconds) of sensor data collection"
     range 1 300

app/src/alerts.c

@@ -13,6 +13,22 @@
 #include <alerts.h>
 #include <logging/log.h>
 LOG_MODULE_REGISTER(alerts, CONFIG_PYRRHA_LOG_LEVEL);
+#define OVER_TEMPERATURE(temp) (temp > CONFIG_TEMPERATURE_ALERT_THRESHOLD_CELCIUS)
+#define OVER_CO(co) (co > CONFIG_CO_ALERT_THRESHOLD_PPM)
+#define OVER_NO2(no2) (no2 > CONFIG_NO2_ALERT_THRESHOLD_PPM)
+
+/**
+ * @brief generate an alert from sensor data exceeding set thresholds
+ */
+static void threshold_alert(void){
+    return;
+}
 int generate_alerts(struct pyrrha_data * data){
+    if (OVER_TEMPERATURE(data->rht.temperature.val1) ||
+        OVER_CO(data->gas.co.val1) ||
+        OVER_NO2(data->gas.no2.val1))
+    {
+        threshold_alert();
+    }
     return 0;
 }