# /flash/mem_fire_check.py 

# check_psram_status.py - M5Stack Fire PSRAM Detection Script
import gc
import os
import sys
import machine


def check_psram_status():
    print("M5Stack Fire PSRAM Detection Status")
    print("=" * 50)

    # 1. System information
    print("1. System Information:")
    print(f" - MicroPython version : {sys.implementation.version}")
    print(f" - Platform           : {sys.platform}")
    print(f" - Machine            : {os.uname().machine}")

    # 2. Official esp32 PSRAM API check
    print("\n2. Official PSRAM API Check:")
    try:
        import esp32
        if hasattr(esp32, 'PSRAM'):
            size = esp32.PSRAM.size()
            print(f"   esp32.PSRAM available: {size:,} bytes "
                  f"({size / 1024 / 1024:.1f} MB)")
        else:
            print("   esp32.PSRAM attribute NOT found")
    except Exception as e:
        print(f"   Failed to access esp32.PSRAM → {e}")

    # 3. Current heap status
    print("\n3. Heap Memory Status:")
    gc.collect()
    total_heap = gc.mem_alloc() + gc.mem_free()
    print(f" - Total heap   : {total_heap:,} bytes ({total_heap / 1024 / 1024:.2f} MB)")
    print(f" - Allocated    : {gc.mem_alloc():,} bytes")
    print(f" - Free         : {gc.mem_free():,} bytes")

    # 4. PSRAM allocation stress test
    print("\n4. PSRAM Allocation Test (512KB chunks):")
    test_psram_allocation()

    print("=" * 50)


def test_psram_allocation():
    gc.collect()
    start_free = gc.mem_free()
    buffers = []
    chunk_size = 512 * 1024  # 512KB

    try:
        for i in range(1, 17):  # Try up to ~8MB
            buf = bytearray(chunk_size)
            buffers.append(buf)
            allocated = len(buffers) * chunk_size
            current_free = gc.mem_free()

            print(f"   {allocated / 1024 / 1024:.1f} MB allocated → "
                  f"{current_free / 1024 / 1024:.2f} MB free")

            # If free memory drops too fast → we're NOT using PSRAM
            if start_free - current_free > (start_free * 0.8):
                print("   Sudden heap drop detected → Running WITHOUT PSRAM")
                break

    except MemoryError:
        print(f"   MemoryError at {allocated / 1024 / 1024:.1f} MB → "
              "PSRAM is NOT enabled in firmware")
    except Exception as e:
        print(f"   Unexpected error: {e}")
    finally:
        del buffers[:]
        gc.collect()
        print(f"   Cleanup complete → Free memory: "
              f"{gc.mem_free() / 1024 / 1024:.2f} MB")


def check_firmware_psram_support():
    print("\n5. Firmware PSRAM Support Summary:")
    print("   Testing different detection methods...")

    results = []

    # Method 1: esp32.PSRAM
    try:
        import esp32
        if hasattr(esp32, 'PSRAM') and esp32.PSRAM.size() > 0:
            results.append("esp32.PSRAM API → Supported "
                          f"({esp32.PSRAM.size() / 1024 / 1024:.1f} MB)")
        else:
            results.append("esp32.PSRAM API → Not available")
    except:
        results.append("esp32.PSRAM API → Failed to import")

    # Method 2: Large allocation test
    gc.collect()
    try:
        _ = bytearray(6 * 1024 * 1024)  # 6MB
        results.append("Large allocation (6MB+) → SUCCESS (PSRAM likely enabled)")
        del _
    except MemoryError:
        results.append("Large allocation (6MB+) → FAILED (NO PSRAM)")

    gc.collect()

    # Final verdict
    for r in results:
        print(f"   • {r}")

    print("\n   Verdict:")
    if any("SUCCESS" in r or "Supported" in r for r in results):
        print("   PSRAM is ENABLED and working!")
    else:
        print("   PSRAM is DISABLED → Flash a PSRAM-enabled firmware!")


# Main execution
if __name__ == "__main__":
    check_psram_status()
    check_firmware_psram_support()



------------- Result    =============


MicroPython v1.25.0-dirty on 2025-10-24; M5STACK Fire with ESP32(SPIRAM)
Type "help()" for more information.
>>> 
>>> 
>>> import check_psram_status as pp
>>> pp.check_psram_status
<function check_psram_status at 0x3f8034c0>
>>> pp.check_psram_status()
M5Stack Fire PSRAM Detection Status
==================================================
1. System Information:
 - MicroPython version : (1, 25, 0, '')
 - Platform           : esp32
 - Machine            : M5STACK Fire with ESP32(SPIRAM)

2. Official PSRAM API Check:
   esp32.PSRAM attribute NOT found

3. Heap Memory Status:
 - Total heap   : 4,184,768 bytes (3.99 MB)
 - Allocated    : 7,856 bytes
 - Free         : 4,176,864 bytes

4. PSRAM Allocation Test (512KB chunks):
   0.5 MB allocated → 3.42 MB free
   1.0 MB allocated → 2.91 MB free
   1.5 MB allocated → 2.40 MB free
   2.0 MB allocated → 1.90 MB free
   2.5 MB allocated → 1.46 MB free
   3.0 MB allocated → 0.96 MB free
   3.5 MB allocated → 0.46 MB free
   Sudden heap drop detected → Running WITHOUT PSRAM
   Cleanup complete → Free memory: 3.44 MB
==================================================
>>>

fatal error occurred: Could not open COM3, the port is busy or doesn't exist.
(could not open port 'COM3': PermissionError(13, 'Access is denied.', None, 5))

Please, I need help in correcting this error.

Are you using M5Burner? is com3 detected in it for your device? is there diff software with your com port 3 opened in it in the background? lack of info about your hardware/software setup really

現在、M5Stack FIRE に関して次の2つのバージョンがあります。
　　1) V2.6 (USBチップ: CH9102F) ※BALA2 FIREとして購入したもの
　　2) V2.7 (USBチップ: CH9102F)
2)のV2.7については、Windows11(24H2)で問題なくUSBシリアルポート接続
認識ができていますが、同一環境(PC環境、USB接続環境、USBケーブル等)
で、1)のV2.6について、デバイスマネージャでCOMポートとして認識できず
困っています。

様々なUSB環境(ハブ、ケーブル等)で試していますが、一瞬接続できたことも
過去にありましたが、現状は、ことごとく正しく認識されません。

もし、同様のトラブルに遭遇された方で、アドバイスなどがございましたら
よろしくお願いします。

Ruri

73 de DO6GZ

Actually, any M5Stack device would be acceptable: Atoms, Base, Fire...

Even better would be to have the Fire connect to a Bluetooth keyboard to accept keys from it.

I'm dealing with M5Stack Fire, and I'm trying to display Portuguese characters on display, until now without success.

So basically a simple program like

#include <M5Stack.h>

void setup() {
  // Initialize the M5Stack
  M5.begin();
  
  // Clear the screen and display a message
  M5.Lcd.clear();
  M5.Lcd.setCursor(50, 50);
  M5.Lcd.print("Configuração está ok"); //Meaning: configuration it's ok
}

void loop() {
  // No need to put anything in loop for this example
}

But this does not print the ç character, ã or even á.
I tried to load a custom font, but this is not good, because then I can't set it's size dynamically.

Is there any way to make the M5Stack fire support these characters?

First the UIFlow UI does not show a "play WAV file" not in the SDCard section, the Speaker section, nor in the DAC section.

Second

from wav import wav_player
wav_player.playWav('/sd/myfile.wav')

fails with an I2S does not have MODE_MASTER error.

Third

import machine
dac0 = machine.DAC(25)
dac0.wavplay('/sd/myfile.wav')

does not work either, no sound is produced.

However the similar (according to the code)

from wav import wav
ww = wave.open('/sd/myfile.wav')
sample_rate = ww.getframerate()

# read all data, play in background
data = ww.readframes(ww.getnframes())
dac_buffer = array.array("B", data)
ret = dac0.write_buffer(dac_buffer, sample_rate, wait=False)

works fine. Finally !

If the sound file is big you can also use

while True:
  data = ww.readframes(2048)
  if len(data) > 0:
    dac_buffer = array.array("B", data)
    ret = dac0.write_buffer(dac_buffer, sample_rate, wait=True)
  else:
    break

or similar (notice the difference in wait=False or True)

I hope this helps future users.
In the end digging into the code of what M5Stack provides or not has been the best way to understand how to make the best out of the codebase.

(could not use UIFlow 2 due to SDCard issue)

please have a look at the button example here.

I think you are missing an M5.update() inside the loop().

Thanks
Felix

maybe related to the note at the bottom here?

Note: 2018.2A PCB version of the device does not support C2C (TypeC to TypeC) connection and PD power supply.

Thanks
Felix

BTW i forgot to mention that I also removed those nasty magnets as they disturb the used magnetometer. The metal screws where also replaced with plastic made.

My mistake was assuming the "Configurations" button was essential. If I ignore than and click "Burn" everything is fine.

How do I display it on the M5 stack with its display.

Happy to discuss more here

hmm, with an M5Stack Fire (HW: 2018.2A) running your code I get "Power canControl OK".

Have you tried to run I2C_Tester.ino? The I2C scan finds 0x10 (BMM150), 0x68 (MPU6886) and 0x75 (IP5306).

Thanks
Felix

Best regards,
C.A.

Thanks
Felix