Using SD card with portenta

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Portenta H7: Write to SD Card

Hi, I would like to write to an Micro SD Card. I'm using the Pins 55, 57, 59, 61,63, 65 on the high density connector J1 (see appendix). The example code TestSDCARD.ino is working well and I can list some directories on the SD Card. Now I trying to use the FATFileSystem with fopen, fprintf and fclose, but I can't write to the SD Card. The red LED on the Portenta board starts flashing. The Serial output is: Test 1 Which concludes that there is a error in line fprintf(fs,"test \r\n"); #inclu…