LittleFS unable to create a file dynamically over two existent files

[HamzaHajeir]

Hi there,

In my journey to fully port a framework, I've faced an issue related to the FS, wherein the FS could not create a file if the system has already at least two files, whether being uploaded or created dynamically.

MCVE:

#include <Arduino.h>
#include <LittleFS.h>
#include <string>

void writeFile(const char* fn, const char* content) {
    File file = LittleFS.open(fn, "w+");
    file.write(content);
    file.close();

}
std::string readFile(const char* fn) {
    File file = LittleFS.open(fn, "r");
    if (!file) {
        Serial.printf("Failed to open\n");
        return "";
    }
    std::string data (file.size(), '#');
    file.readBytes(data.data(),file.size());
    file.close();
    return data;
}

void checkFile(const char* fn) {
    auto data = readFile(fn);
    Serial.printf("File [%s]: ", fn);
    if (data.empty()) {
        Serial.printf("[EMPTY/INEXISTENT]\n");
        return;
    }
    Serial.printf("\"%s\"\n", data.c_str());
}
void setup() {
    Serial.begin(921600);
    delay(5000);
    if (!LittleFS.begin()) {
        Serial.printf("Failed to mount LittleFS\n");
    }
    if (!LittleFS.format()) {
        Serial.printf("Failed to format LittleFS\n");
    }
    writeFile("/somefile", "Test1");
    checkFile("/somefile");

    writeFile("/somefile2", "Test2");
    checkFile("/somefile2");

    writeFile("/somefile3", "Test3");
    checkFile("/somefile3");
}
void loop() {

}

Output:

lfs_file_close: fd=0x20011a34
lfs_file_close: fd=0x20011a34
File [/somefile]: "Test1"
lfs_file_close: fd=0x20011a34
Unable to set last write time on '/somefile2' to 5
lfs_file_close: fd=0x20011a34
File [/somefile2]: "Test2"
LittleFSDirImpl::openFile: rc=-36 fd=0x20011a34 path=`/somefile3` openMode=5 accessMode=3 err=-36
LittleFSDirImpl::openFile: rc=-2 fd=0x20011a34 path=`/somefile3` openMode=0 accessMode=1 err=-2
Failed to open
File [/somefile3]: [EMPTY/INEXISTENT]

platformio.ini:

[env:pico]
platform = https://github.com/maxgerhardt/platform-raspberrypi.git
board = rpipicow
framework = arduino
board_build.core = earlephilhower
monitor_speed = 921600

lib_ldf_mode = deep+

build_flags = -DEMBEDDED_PLATFORM
    '-DARDUINO_BOARD="RASPBERRY_PI_PICO_W"'
    -DDEBUG_RP2040_PORT=Serial

board_build.filesystem_size = 0.6m

upload_port = F:

[earlephilhower]

It works fine from Arduino IDE.

File [/somefile]: "Test1"
File [/somefile2]: "Test2"
File [/somefile3]: "Test3"

My guess is you're specifying something wrong in the platform.ini. Try using 0.5m for the filesystem size instead of 0.6m. 512KB is a standard size, 0.6M isn't and I bet it's not actually implemented.

[HamzaHajeir]

My guess is you're specifying something wrong in the platform.ini. Try using 0.5m for the filesystem size instead of 0.6m. 512KB is a standard size, 0.6M isn't and I bet it's not actually implemented.

Correct, it was that configuration, which I though it was easily editable.

Thank you, now it works as expected.