Add grid and EVSE meter components with load balancer

components/evsemeter/CMakeLists.txt

@@ -0,0 +1,9 @@
+set(srcs
+    "src/evsemeter_modbus.c"
+    "src/evsemeter_ade7758.c"
+    "src/evsemeter_events.c"
+)
+
+idf_component_register(SRCS "${srcs}"
+                      INCLUDE_DIRS "include"
+                      REQUIRES meter_orno_modbus)

components/evsemeter/include/evsemeter.h

@@ -0,0 +1,24 @@
+#ifndef EVSEMETER_H_
+#define EVSEMETER_H_
+
+#include "esp_err.h"
+#include "esp_event_base.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+ESP_EVENT_DECLARE_BASE(EVSEMETER_EVENT);
+
+typedef enum {
+    EVSEMETER_EVENT_UPDATE
+} evsemeter_event_id_t;
+
+esp_err_t evsemeter_init(void);
+esp_err_t evsemeter_read_current(float *current);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* EVSEMETER_H_ */

components/evsemeter/src/evsemeter_ade7758.c

@@ -0,0 +1,21 @@
+#include "evsemeter.h"
+#include "esp_event.h"
+#include "esp_log.h"
+
+static const char *TAG = "evsemeter_ade7758";
+
+esp_err_t evsemeter_init(void)
+{
+    ESP_LOGI(TAG, "Initializing EVSE meter (ADE7758)");
+    return ESP_OK;
+}
+
+esp_err_t evsemeter_read_current(float *current)
+{
+    if (!current) {
+        return ESP_ERR_INVALID_ARG;
+    }
+    *current = 0.0f;
+    esp_event_post(EVSEMETER_EVENT, EVSEMETER_EVENT_UPDATE, current, sizeof(float), portMAX_DELAY);
+    return ESP_OK;
+}

components/evsemeter/src/evsemeter_events.c

@@ -0,0 +1,3 @@
+#include "evsemeter.h"
+
+ESP_EVENT_DEFINE_BASE(EVSEMETER_EVENT);

components/evsemeter/src/evsemeter_modbus.c

@@ -0,0 +1,22 @@
+#include "evsemeter.h"
+#include "orno_modbus.h"
+#include "esp_event.h"
+#include "esp_log.h"
+
+static const char *TAG = "evsemeter_modbus";
+
+esp_err_t evsemeter_init(void)
+{
+    ESP_LOGI(TAG, "Initializing EVSE meter (Modbus)");
+    return orno_modbus_init();
+}
+
+esp_err_t evsemeter_read_current(float *current)
+{
+    esp_err_t err = orno_modbus_read_current(ORNO_METER_EVSE, current);
+    if (err == ESP_OK)
+    {
+        esp_event_post(EVSEMETER_EVENT, EVSEMETER_EVENT_UPDATE, current, sizeof(float), portMAX_DELAY);
+    }
+    return err;
+}