SD_MMC.flush() don't flush pending data to the file

[magnuskarlsson]

Hardware:

Board: ESP Wroom-32

Description:

SD_MMC.flush() do not sync the file as expected. Without SD_MMC.close() the file is empty.

Sketch:

#include "FS.h"
#include "SD_MMC.h"

File file;

void setup(){
    Serial.begin(115200);
    if(!SD_MMC.begin()){
        Serial.println("Card Mount Failed");
        return;
    }
    uint8_t cardType = SD_MMC.cardType();

    if(cardType == CARD_NONE){
        Serial.println("No SD_MMC card attached");
        return;
    }

    Serial.print("SD_MMC Card Type: ");
    if(cardType == CARD_MMC){
        Serial.println("MMC");
    } else if(cardType == CARD_SD){
        Serial.println("SDSC");
    } else if(cardType == CARD_SDHC){
        Serial.println("SDHC");
    } else {
        Serial.println("UNKNOWN");
    }

    uint64_t cardSize = SD_MMC.cardSize() / (1024 * 1024);
    Serial.printf("SD_MMC Card Size: %lluMB\r\n", cardSize);

    file = SD_MMC.open("/hello.txt", FILE_WRITE);
    if(!file){
        Serial.println("Failed to open file for writing");
        return;
    }
    if(file.print("Hello ***\r\n")){
        Serial.println("File written");
    } else {
        Serial.println("Write failed");
    }
    file.flush();

    // file.close();
}

void loop(){

}

Debug Messages:

Enable Core debug level: Debug on tools menu of Arduino IDE, then put the serial output here 

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