Add grid and EVSE meter components with load balancer

components/loadbalancer/src/loadbalancer.c

@@ -0,0 +1,67 @@
+#include "loadbalancer.h"
+#include "gridmeter.h"
+#include "evsemeter.h"
+#include "evse_api.h"
+#include "esp_event.h"
+#include "esp_log.h"
+#include "freertos/FreeRTOS.h"
+#include "freertos/task.h"
+
+static const char *TAG = "loadbalancer";
+
+static float grid_current = 0.0f;
+static float evse_current = 0.0f;
+static float max_grid_current = 32.0f; // amperes
+
+static void grid_event_handler(void *arg, esp_event_base_t base, int32_t id, void *data)
+{
+    if (id == GRIDMETER_EVENT_UPDATE && data)
+    {
+        grid_current = *(float *)data;
+    }
+}
+
+static void evse_event_handler(void *arg, esp_event_base_t base, int32_t id, void *data)
+{
+    if (id == EVSEMETER_EVENT_UPDATE && data)
+    {
+        evse_current = *(float *)data;
+    }
+}
+
+void loadbalancer_init(void)
+{
+    ESP_LOGI(TAG, "Initializing load balancer");
+    esp_event_handler_register(GRIDMETER_EVENT, GRIDMETER_EVENT_UPDATE, grid_event_handler, NULL);
+    esp_event_handler_register(EVSEMETER_EVENT, EVSEMETER_EVENT_UPDATE, evse_event_handler, NULL);
+}
+
+void loadbalancer_task(void *param)
+{
+    while (true)
+    {
+        float available = max_grid_current - grid_current + evse_current;
+        if (available < 6.0f)
+        {
+            available = 6.0f;
+        }
+        ESP_LOGD(TAG, "Setting current limit: %f", available);
+        evse_set_current_limit((uint16_t)available);
+        vTaskDelay(pdMS_TO_TICKS(1000));
+    }
+}
+
+void setMaxGridCurrent(int value)
+{
+    max_grid_current = value / 10.0f; // assume value in A*10
+}
+
+void setLiveGridCurrent(int value)
+{
+    grid_current = value / 10.0f;
+}
+
+void setLiveVolt(int value)
+{
+    (void)value; // unused for now
+}