CSV file save on SPIFF filesystem, 10MB on internal flash

RotaxMonitor/src/datasave.cpp

@@ -0,0 +1,60 @@
+#include "datasave.h"
+
+void save_history(const PSRAMVector<ignitionBoxStatus> &history)
+{
+    // Initialize SPIFFS
+    if (!SPIFFS.begin(true))
+    {
+        LOG_ERROR("Failed to mount SPIFFS");
+        LOG_ERROR("5 seconds to restart...");
+        vTaskDelay(pdMS_TO_TICKS(5000));
+        esp_restart();
+    }
+    else
+    {
+        LOG_INFO("SPIFFS mounted successfully");
+        return;
+    }
+
+    std::ofstream ofs("/spiffs/ignA_history.csv", std::ios::out | std::ios::trunc);
+    if (ofs.fail())
+    {
+        LOG_ERROR("Failed to open file for writing");
+        return;
+    }
+
+    //write csv header
+    ofs << "TS,\
+    EVENTS_12,DLY_12,STAT_12,V_12_1,V_12_2,V_12_3,V_12_4,IGNITION_MODE_12,\
+    EVENTS_34,DLY_34,STAT_34,V_34_1,V_34_2,V_34_3,V_34_4,IGNITION_MODE_34,\
+    ENGINE_RPM,ADC_READTIME,N_QUEUE_ERRORS";
+    for (auto &entry : history)
+    {
+        ofs << std::to_string(entry.timestamp) << ","
+            << std::to_string(entry.coils12.n_events) << ","
+            << std::to_string(entry.coils12.spark_delay) << ","
+            << std::string(sparkStatusNames.at(entry.coils12.spark_status)) << ","
+            << std::to_string(entry.coils12.peak_p_in) << ","
+            << std::to_string(entry.coils12.peak_n_in) << ","
+            << std::to_string(entry.coils12.peak_p_out) << ","
+            << std::to_string(entry.coils12.peak_n_out) << ","
+            << std::string(softStartStatusNames.at(entry.coils12.sstart_status)) << ","
+            << std::to_string(entry.coils34.n_events) << ","
+            << std::to_string(entry.coils34.spark_delay) << ","
+            << std::string(sparkStatusNames.at(entry.coils34.spark_status)) << ","
+            << std::to_string(entry.coils34.peak_p_in) << ","
+            << std::to_string(entry.coils34.peak_n_in) << ","
+            << std::to_string(entry.coils34.peak_p_out) << ","
+            << std::to_string(entry.coils34.peak_n_out) << ","
+            << std::string(softStartStatusNames.at(entry.coils34.sstart_status)) << ","
+            << std::to_string(entry.eng_rpm) << ","
+            << std::to_string(entry.adc_read_time) << ","
+            << std::to_string(entry.n_queue_errors);
+        ofs << std::endl;
+    }
+    auto written_bytes = ofs.tellp();
+    ofs.flush();
+    ofs.close();
+    LOG_INFO("Ignition A history saved to SPIFFS, bytes written: ", (uint32_t)written_bytes);
+    SPIFFS.end(); // unmount SPIFFS to ensure data is written and avoid corruption on next mount
+}