esp32: replace port with PlatformIO implementation and add CI build (#1292)

ports/esp32/src/main.cpp

@@ -0,0 +1,57 @@
+/**
+ * @file
+ * @brief BACnet MS/TP application entry point for M5StamPLC
+ * @author Kato Gangstad
+ */
+
+#include <Arduino.h>
+#include <M5StamPLC.h>
+
+#ifndef PLC_INPUT_ACTIVE_LOW
+#define PLC_INPUT_ACTIVE_LOW 0
+#endif
+
+extern "C" {
+#include "bacnet_app.h"
+}
+
+/**
+ * @brief Initialize the MS/TP application and PLC hardware
+ */
+void setup(void)
+{
+    Serial.begin(115200);
+    delay(100);
+    Serial.println("[BOOT] Mode: BACnet MS/TP");
+    Serial.println("[BOOT] Init M5StamPLC...");
+    M5StamPLC.begin();
+    Serial.println("[BOOT] Init BACnet app...");
+    bacnet_app_init();
+    Serial.println("[BOOT] BACnet MS/TP ready");
+}
+
+/**
+ * @brief Run the main MS/TP application loop
+ */
+void loop(void)
+{
+    M5StamPLC.update();
+
+    for (uint8_t i = 0; i < bacnet_app_input_count(); i++) {
+        bool state = M5StamPLC.readPlcInput(i);
+#if PLC_INPUT_ACTIVE_LOW
+        state = !state;
+#endif
+        bacnet_app_input_set(i, state);
+    }
+
+    for (uint8_t i = 0; i < bacnet_app_relay_count(); i++) {
+        M5StamPLC.writePlcRelay(i, bacnet_app_relay_get(i));
+    }
+
+    bacnet_app_temperature_set(M5StamPLC.getTemp());
+    bacnet_app_free_heap_kb_set((float)ESP.getFreeHeap() / 1024.0f);
+
+    bacnet_app_tick();
+    delay(1);
+}