Setting mbed_override_console to target a file on a block device

Mbed OS
8

  • Try to define the FULL_LOG_FILE_PATH as
    #define FULL_LOG_FILE_PATH "/fs/logs.txt"

  • You can find a very nice explanation how the printf works in Mbed OS 6, including overriding the console, at Hitchhiker's Guide to Printf in Mbed 6
    To redirect the printf it’s sufficient to override the console only for the stdout file descriptor:

FileHandle *mbed::mbed_override_console(int fd)
{
    if (fd == STDOUT_FILENO) {
         ...
        return &logFile;
    }
    else {
        return NULL;  // don't override stdin and stderror
    }
}