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I helped Andrey change project to fix this.
1) In \Espruino\targets\linux\jshardware.c we cut function

bool jshSleep(JsSysTime timeUntilWake)  {
...
...
...
}

to

bool jshSleep(JsSysTime timeUntilWake) {
  return false;
}

2) In \Espruino\targets\mbed\jshardware.cpp

bool jshSleep(JsSysTime timeUntilWake) {
   __WFI(); // Wait for Interrupt
   return true;
}

to

bool jshSleep(JsSysTime timeUntilWake) {
   return true;
}

3) In \Espruino\targets\stm32\jshardware.c

bool jshSleep(JsSysTime timeUntilWake) {
...
...
...
}

to

bool jshSleep(JsSysTime timeUntilWake) {
   return true;
}

We have a working result. Thank you!

If call setTimeout with value more than 12000, then this function execute immediately.
How to fix this?

I like to think that it is the original F407 :)

Two USB ports connected to board, but doesn't work.

Thank you very much for the detailed explanation.

Hi, Gordon, Hi all!
It's me again.
I have some question to community.
STM323F4 includes USB-COM to connect with PC.
But I did not get to use this feature.
Now I'm use external USB-COM converter.
Converter connected to pins {rx:A3,tx:A2}.

My working code:

Serial2.setup(9600, {rx:A3,tx:A2});

Tried to use:

USB.setup(9600);       

and

USB.setup(9600, {dm:A11,dp:A12});

Can I use internal converter? How can I do this?

Gordon can you explain why object setTimeout spend a lot of memory?

DrAzzy thank you. The problem is really in incorrect use of setTimeout. This function was spending a lot of memory, because i often called this.
Friends, you all helped me a lot thank you so much!

Thank you for answer! Be sure to tell about the results.

SUCCESS (9600 baudrate)
Before transmitting the file (400 bytes) process.memory() returns:
{"free":5296,"usage":154,"total":5450,"history":134,"stackEndAddress":536984008,"flash_start":134217728,"flash_binary_end":1

ERROR (9600 baudrate)
After transmitting the file (400 bytes) process.memory() returns:
{"free":58,"usage":5392,"total":5450,"history":1,"stackEndAddress":536984008,"flash_start":134217728,"flash_binary_end":134413196,"flash_code_start":135135232,"flash_length":1048576}

SUCCESS (115200 baudrate)
After transmitting the file (2 528 bytes) process.memory() returns:
{"free":1195,"usage":4255,"total":5450,"history":140,"stackEndAddress":536984008,"flash_start":134217728,"flash_binary_end":134413196,"flash_code_start":135135232,"flash_length":1048576}

Error:

0) send
1) send
2) send
3) send
4) send
5) send
6) send
7) send
8) send
9) send
10) send
11) send
12) send
13) send
...
...
...
126) send
127) send
128) send
129) send
130) send
131) send
132) send
ERROR: Out of Memory!
WARNING: Unable to create string as not enough memory
ERROR: Out of Memory!
ERROR: Out of Memory!
WARNING: Unable to create string as not enough memory
ERROR: Out of Memory!
ERROR: Out of Memory!
WARNING: Unable to create string as not enough memory
ERROR: Out of Memory!
ERROR: Out of Memory!
WARNING: Unable to create string as not enough memory
ERROR: Error processing Serial data handler - removing it.
Execution Interrupted during event processing.
at line 3 col 18
  process.memory();
in function called from system
WARNING: String buffer overflowed maximum size (512)
WARNING: String buffer overflowed maximum size (512)
...
...
...
WARNING: String buffer overflowed maximum size (512)
WARNING: String buffer overflowed maximum size (512)
WARNING: String buffer overflowed maximum size (512)
ERROR: Out of Memory!
ERROR: Out of Memory!
...
...
...
ERROR: Out of Memory!
ERROR: Out of Memory!
Execution Interrupted during event processing.
at line 2 col 18
      if (arr == null)  return;
                  
in function called from system
{
    "crosstime": {
        "1": [
            1,
            10,
            3,
            3
        ],
        "2": [
            1,
            10,
            3,
            3
        ],
        "3": [
            1,
            20,
            3,
            1
        ]
    },
    "racks": {
        "1": {
            "1": 1,
            "2": 1,
            "3": 0,
            "4": 0,
            "5": 5,
            "6": 5
        },
        "2": {
            "1": 2,
            "2": 2,
            "3": 0,
            "4": 0,
            "5"
> 

Hi, Gordon, Hi all!
Working with the board STM32F4.
I have a problem when I try to transfer file from PC to UART (pins PA2, PA3).
If the file size small (less 200 bytes) all is well.
If the file size a bit more, then sometimes console shows the error memory.
If the file size like 2000 bytes, then always console shows the error memory.

I try change baudrate of UART from 9600 to 115200, and have a successful file transfer size in 2 528 bytes. But after a few hours situation with the problem persists.
STM32F4 has a lot of memory. Why this error occurs?

My project:

var LED_ORANGE = LED1;
var LED_GREEN  = LED2;
var LED_RED    = LED3;
var LED_BLUE   = LED4;
var arr = null;


function Toggle_Led(LED) {
 on = !on;
 digitalWrite(LED, on);
 return 1;
}

function Show(str) {
  console.log('**' + str);
}

function Thread1() {
  Toggle_Led(LED_ORANGE);

}

var Counter = 0;
Show("Start!");


// Тест UART
//==================================================================
Serial2.setup(9600, {rx:A3,tx:A2});
//USB.setup(9600, {dm:A11,dp:A12});
Serial2.on('data', function (data) {  // Receive function
  console.log(Counter + ") send");
  process.memory();
  if (data.length > 0) {  
    digitalWrite(LED_GREEN, 1);
    //console.log(data + "\n");
    
    if (arr == null)  {
      arr = new Array();
    }
    arr.push(data);          // Add new element

    // Таймаут приёма
    //==============================================================
    setTimeout(function (e) {
      if (arr == null)  return;
      //for (var i=0; i<arr.length; i++)
      //{
      //  console.log(arr[i]);
      //}
      var str = arr.join("");
      console.log(str);
      
      arr = null;
      Serial2.println(str);        // Send
      
      digitalWrite(LED_GREEN, 0);
      digitalWrite(LED_RED, 0);
    }, 5000);
    //==============================================================
  } else {
    digitalWrite(LED_RED, 1);
    console.log("Bad");
  }
  
  Counter++;
});
//==================================================================



setInterval(Thread1,3000);
Show("Stop!");
save();

My File:
{

"crosstime": {
    "1": [
        1, 
        10, 
        3, 
        3
    ], 
    "2": [
        1, 
        10, 
        3, 
        3
    ], 
    "3": [
        1, 
        20, 
        3, 
        1
    ]
}, 
"racks": {
    "1": {
        "1": 1, 
        "2": 1, 
        "3": 0, 
        "4": 0, 
        "5": 5, 
        "6": 5
    }, 
    "2": {
        "1": 2, 
        "2": 2, 
        "3": 0, 
        "4": 0, 
        "5": 5, 
        "6": 5
    }, 
    "3": {
        "1": 1, 
        "2": 1, 
        "3": 0, 
        "4": 0, 
        "5": 5, 
        "6": 5
    }, 
    "4": {
        "1": 2, 
        "2": 2, 
        "3": 0, 
        "4": 0, 
        "5": 5, 
        "6": 5
    }
}, 
"groups": {
    "1": {
        "1": [
            1, 
            3, 
            4, 
            5
        ], 
        "2": [
            2, 
            2, 
            2, 
            2
        ], 
        "3": [
            2, 
            2, 
            2, 
            2
        ]
    }, 
    "2": {
        "1": [
            2, 
            2, 
            2, 
            2
        ], 
        "2": [
            1, 
            3, 
            4, 
            5
        ], 
        "3": [
            2, 
            2, 
            2, 
            2
        ]
    }, 
    "3": {
        "1": [
            2, 
            2, 
            2, 
            2
        ], 
        "2": [
            2, 
            2, 
            2, 
            2
        ], 
        "3": [
            2, 
            3, 
            4, 
            2
        ]
    }
}, 
"desc": {
    "note": "\u041f\u0440\u043e\u0441\u0442\u0435\u0439\u0448\u0438\u0439 \u0441\u0432\u0435\u0442\u043e\u0444\u043e\u0440 \u0438\u0437 3 \u0433\u0440\u0443\u043f\u043f \u0438 3 \u0444\u0430\u0437.", 
    "phases": "3", 
    "name": "\u0422\u0435\u0441\u0442", 
    "groups": "3", 
    "addr": "\u0421\u0442\u0435\u043d\u0434"
}

}