SPWF04 Error:50:Unable to access filesystem

[Marc ZK]

Posted on June 29, 2017 at 10:05

Hi 

I am using a SPWF04, and I am connecting it to PC using 

STM32 Nucleo as USB2UART bridge ( This is running WiFi VCOM , STM32L476RG-Nucleo project.bin )

I am working on a project where I want to have a webpage on the SPWF04 (similar to the example applications). The SPWF04 will be in Wi-Fi AP mode, and allow connection from mobile devices.  The mobile device will hit the webpage - which in turn will cause SSI calls to the SPWF04 module.   I will then have micropython code on the SPWF04 that will receive the SSI call (through +WIND notifications) and will return the relevant data for the SSI field.

The micropython will also have an open connection to UART/USB to a PC - and will send/receive messages on that port.

I am currently experiencing some issues that I hope you can help with:

1)  Please could you confirm that for development purposes, I am using the 

STM32 Nucleo as USB2UART bridge in the correct way i.e. using WiFi VCOM  - or should i be using something else on the Nucleo?

2)  Using TeraTerm, I connect to the SPWF04/Nucleo from PC/USB - with baud rate 115200 and with 1msec/char transmit delay (as recommended on a previous post).  I have sometimes had issues wiht accessing the filesystem. i.e. When i sent AT+S.FSL  - i get a response of AT-S.ERROR:50:Unable to access filesystem

What causes this? and how can i resolve it?

(UPDATE:  I have noticed that I am getting a +WIND:7:Configuration Failure:13 - which from the documentation is detailed as '

13. Shown when APP disk cannot be mounted'.  (AT+S.STS shows app_fs=0 and user_fs=0)

3)  I have tried connecting to the SWPF04/Nucleo from a python script running on the PC.  This opens the serial port and sends AT commands (SWPF04 in console_enabled = 1 mode).  Some of the characters of the AT command appear to get lost e.g.  The script may send AT+RESET<cr> - but the response is 'AT+RSET unknown'.  

[Gerardo GALLUCCI]

Posted on June 29, 2017 at 13:27

Ciao,

1) you can use STM32 (+ VCOM application) or dedicated HW (like 

http://www.st.com/content/st_com/en/products/evaluation-tools/solution-evaluation-tools/communication-and-connectivity-solution-eval-boards/steval-pcc018v1.html

) to send AT-commands;

2) APP_Disk is intended to be always mounted. Probably you erased module's flash @ address 0x08100000. Download and flash again full image available online, or perform an OTA update on APP_Disk;

3) if you are using latest VCOM FW (v3.0.2), no more data loss should be in place. Please let me know if you are aligned with this version.

BR

jerry

[Marc ZK]

Posted on June 29, 2017 at 13:36

Thank you for clarifying

1) I will continue to use STM +VCOM

2) I have now updated the filesystem using a created filesystem and the FSUPDATE=i, command.  I have noticed that the default files all seem to look correct (ie, filesize > 0) but for some of the html files that I have created the file is detailed in the FSL listing but the filesize is set to 0, so i need to look into why that has happened

3) I am using VCOM FW (v3.0.2).  What settings are recommended when running from a PC using Python to open serial port, rather than TeraTerm.  ( What do you need to set inter_byte_timeout' on the PySerial port ?  and/or rtscts etc?)

[Mareike H]

Posted on September 01, 2017 at 12:39

I got the same error as I tried to enable WIFI depending on the content of a file so I set:

AT+S.WIFI=0

AT+S.SCFG=wifi_mode,3AT+S.WCFGAT+S.RESET

I found out that you have to set WIFI=1 once after reset to be able to acces the filesystem. (firmware version 1.0.0)