Logging to SD card

[wrightwells]

It would be great if you could just plug in the Liliygo to the ODB port without the use of a laptop to capture the CAN Logs as it has an onboard SD card slot.

e.g. USER_SETTING.h

/* Other options */
#define LogToSD  

such as https://github.com/espressif/arduino-esp32/blob/master/libraries/SD/examples/SD_Test/SD_Test.ino

Pins for the Liliygo

• CS (SS) = GPIO13
• DI (MOSI) = GPIO15
• DO (MISO) = GPIO02
• SCK (SCLK) = GPIO14

you can tell my vested interest is capturing the CAN messages for the Zero motorbike rather than with a laptop in the footwell of a passenger seat. :)

So I did it, not elegant so will need a review but its working , no error handling on the size of the SD card

I've added it to this fork https://github.com/wrightwells/Battery-Emulator

---------------------------

from arduino-esp32-master copied SD libabry etc directory to Software->src->lib

in Software->src->devboard->utils created LogToSD.h LogToSD.cpp

USER_SETTINGS.h

added
//#define LogToSD //Enable this line to have the TEST_FAKE_BATTERY battery used option above to write the CAN mesages to the onboard SD card.

Updated TEST_FAKE_BATTERY.cpp added

#ifdef LogToSD
#include "../devboard/utils/LogToSD.h"
#include <FS.h>
char buffer[50];  
char msgString[4];
#endif

added to void setup_battery

#ifdef LogToSD
  setupLogToSD();
  writeFile(SD, "/FAKE_BATTERY.txt", "******************    Start of new messages        *************************");
#endif

updated receive_can_battery

void receive_can_battery(CAN_frame rx_frame) {
  datalayer.battery.status.CAN_battery_still_alive = CAN_STILL_ALIVE;
  // All CAN messages recieved will be logged via serial
  Serial.print(millis()); 
  Serial.print("  ");
  Serial.print(rx_frame.ID, HEX);
  Serial.print("  ");
  Serial.print(rx_frame.DLC);
  Serial.print("  ");

  #ifdef LogToSD
  String logData = String(millis()) + "  " + String(rx_frame.ID, HEX) + "  " + String(rx_frame.DLC) + "  ";
  #endif

  for (int i = 0; i < rx_frame.DLC; ++i) {
    sprintf(msgString, "%.2X", rx_frame.data.u8[i]);
    Serial.print(msgString);
    Serial.print(" ");

    #ifdef LogToSD
    logData += String(msgString) + " ";
    #endif
  }

  Serial.println("");

  Serial.println(logData); //test

  #ifdef LogToSD
  logData += "\n";
  appendFile(SD, "/FAKE_BATTERY.txt", logData.c_str());
  #endif
}

[nagyrobi]

+1 for this!!!!

[wrightwells]

didn't like it writting to the SD card constantly so I have changed the appendFile to addToBuffer . in the LogToSD.cpp it now has a buffer and flush routine with a configurable buffer size.

needs testing before a Pull Request

[wrightwells]

thats all now working but its wrapped up in the fork I created for the Zero Battery

[wrightwells]

Got a wiki ready too Write-CAN-to-SD-Card

[HVberg]

Hello If I want to use this, do I have to copy and paste this into the Arduino IDE at USERSETTINGS.h and USERSETTINGS.cpp?and then flash the LyliGo again? Don't want to do anything wrong. I am new here and trying to understand. Thanks