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sd_logger.h

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+// sd_logger.h - SD Card Logger with PCAP format
+
+#ifndef SD_LOGGER_H
+#define SD_LOGGER_H
+
+#include <Arduino.h>
+#include <SD_MMC.h>
+#include <FS.h>
+
+#include "config.h"
+#include "types.h"
+
+// SD status
+extern bool sdInitialized;
+extern uint64_t sdCardSize;
+extern uint64_t sdFreeSpace;
+
+// Current log file
+extern File currentLogFile;
+extern char currentLogFileName[64];
+extern uint32_t currentLogFileSize;
+
+// Initialize SD card
+bool initSDCard();
+
+// Create log directories
+bool createLogDirectories();
+
+// Start new log file
+bool startLogFile();
+
+// Close current log file
+void closeLogFile();
+
+// Write CAN frame to SD (PCAP format)
+bool writeCANFrameToSD(const CanFrame& frame);
+
+// Flush write buffer to SD card
+bool flushWriteBuffer();
+
+// SD Write Task (runs on Core 1)
+void sdWriteTask(void *pvParameters);
+
+// Get SD card info
+uint64_t getSDCardSize();
+uint64_t getFreeSpace();
+uint64_t getUsedSpace();
+
+// List log files
+int listLogFiles(char* buffer, size_t bufferSize);
+
+// Get file info
+bool getLogFileInfo(const char* filename, uint32_t& size, uint32_t& timestamp);
+
+// Delete log file
+bool deleteLogFile(const char* filename);
+
+// Get current filename
+const char* getCurrentLogFilename();
+
+// PCAP file structures
+#pragma pack(push, 1)
+struct PCAPGlobalHeader {
+  uint32_t magicNumber;    // 0xa1b2c3d4
+  uint16_t versionMajor;   // 2
+  uint16_t versionMinor;   // 4
+  int32_t  thiszone;       // GMT to local correction
+  uint32_t sigfigs;        // accuracy of timestamps
+  uint32_t snaplen;        // max length of captured packets
+  uint32_t network;        // data link type (227 = LINKTYPE_CAN_SOCKETCAN)
+};
+
+struct PCAPPacketHeader {
+  uint32_t tsSec;          // timestamp seconds
+  uint32_t tsUsec;         // timestamp microseconds
+  uint32_t inclLen;        // number of octets of packet saved in file
+  uint32_t origLen;        // actual length of packet
+};
+
+struct CANFDFrame {
+  uint32_t canId;          // CAN ID + flags
+  uint8_t  len;            // payload length
+  uint8_t  flags;          // FD flags
+  uint8_t  reserved0;
+  uint8_t  reserved1;
+  uint8_t  data[64];       // payload
+};
+#pragma pack(pop)
+
+#endif // SD_LOGGER_H